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www.gennum.com ga3219 / ga3218 / GA3217 venture? digital dsp system ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 1 of 24 features ? sounddesign? advanced research ? 128-band adaptive noise reduction ? adaptive feedback cancellation ? 128-bit fingerprint security system and other security features to prot ect against device cloning and software piracy ? soft acoustic fade between memory changes ? frontwave? directional processing ? high fidelity audio codec ? 20-bit audio precision ? 95db input dynamic range with hrx? headroom extension ? 1, 2 or 4 channel wdrc compression ? 8-band graphic eq ? 8 biquadratic filters ? drives zero-bias 2- terminal receivers ? 4 analog inputs ? 4 fully configurable memories with audible memory change indicator ? 2 memory select pads ? internal or external volume control ? agco with variable threshold, time constants, and optional adaptive release ? 16khz or 8khz bandwidth ? optimized programming speed ? thinstax? packaging thinstax packaging ? hybrid typical dimensions: 0.215 x 0.124 x 0.065in. 5.46 x 3.15 x 1.65mm description venture is gennum's premiere dsp product designed on the voyageur? platform. combining the power and capabilities of voyageur together with sounddesign advanced research, venture delivers cutting-edge features and high performance. voyageur is gennum's industry-leading programmable digital signal processing platform. sounddesign advanced research is a gennum developed methodology that couples st ate-of-the-art acoustic algorithms to ensure high-fidelity digital sound quality. venture's adaptive noise reduction preserves perceived speech levels with out causing distortion. it monitors noise levels independently in 128 individual bands. this strategy also employs advanced psychoacoustic models to eliminate audible noise and reduce the amount of perceptible artifacts introduced by the noise reduction process. based on a phase cancellation method, venture's adaptive feedback reduction algorithm provides increased maximum stable gain unlike other feedback strategies. additionally, it features rapid adjustment for dynamic feedback situations and resistance to tonal inputs. in addition to these adaptive algorithms, venture also supports the following features: frontwave directional processing, cross fading between audio paths for click-free memory changes, 8-band graphic equalizer, 8 generic biquad filters (configurable as parametric or other filter types), programming speed enhancements, optional peak clipping, flexible compression adjustments, programmable tones for memory change and low battery indicators, wideband gain, volume control and in dustry-leading security features to avoid cloning and software piracy. available venture configurations: ? ga3219: adaptive noise reduction and adaptive feedback canceller ? ga3218: adaptive noise reduction ? GA3217: adaptive feedback canceller
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 2 of 24 block diagram hybrid block diagram fmic sda ms rmic tin ms2 vc mgnd out+ out- vbp pgnd vb gnd vreg dai 16 3 2 14 15 1 54 12 13 6 7 8 9 10 11 programming interface eeprom m u x d/a hbridge peak clipper control a/d a/d a/d clock generator por circuitry wdrc (1,2,4 channels) cross fader mic/telecoil compensation agco f r o n t w a v e feedback canceller noise reduction (128 bands) graphic eq (8 bands) memory select frequency band analysis frequency band synthesis wideband gain tone generator 128 bands voltage regulator volume control pre biquad filters post biquad filters post biquad filters
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 3 of 24 contents features ....................................................................................................................... .1 thinstax packaging.................................................................................................1 description .................................................................................................................... 1 1. pad connection.........................................................................................................4 2. absolute maximum rating .... ....................................................................................4 3. electrical characteristics ...........................................................................................5 4. typical applications ..................................................................................................7 5. venture overview......................................................................................................9 6. signal path.............. .............. .............. .............. .............. .............. .............. ............10 7. functional block description ..................... ..............................................................11 7.1 adaptive feeback canceller .........................................................................11 7.2 adaptive noise reduction .............................................................................11 7.3 a/d and d/a converters ...............................................................................12 7.4 hrx head room expander ................. .............. ............ ........... ........... .........12 7.5 frontwave directionality .. .............. .............. ............ ........... ........... .........12 7.6 channel processing ......................................................................................13 7.7 telecoil path .................................................................................................14 7.8 graphic equalizer .........................................................................................14 7.9 biquad filters ................................................................................................14 7.10 volume control ...........................................................................................15 7.11 agco and peak clipper .. .............. .............. .............. .............. ........... .........15 7.12 memory select switches .............................................................................16 7.12.1 momentary switch on ms..................................................................16 7.12.2 momentary switch on ms, static switch on ms2 (jump to last memory) .......................... .........................................................16 7.12.3 static switch on ms and ms2 ..... .............. .............. .............. ............17 7.12.4 static switch on ms , static switch on ms2 (jump to last memory) .......................... .........................................................17 7.13 audible memory change indicator ........ .............. .............. .............. ............18 7.14 tone generator ............... .............. .............. .............. .............. ........... .........19 7.15 cross fader ................................................................................................19 7.16 power-on/power-off behavior and low battery indicator ... .............. .........19 7.17 software and security ....................... .........................................................21 7.18 sda communication ...................................................................................21 7.19 power management ........... .............. .............. .............. ........... ........... .........21 8. package dimensions ..............................................................................................22 8.1 pad location .................................................................................................23 9. revision history ......................................................................................................24
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 4 of 24 1. pad connection figure 1-1: pad connection 2. absolute maximum rating vreg tin dai ms ms2 vb vbp out- out+ pgnd gnd sda vc rmic fmic mgnd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 parameter value operating temperature range 0c to 40c storage temperature range -20c to 70c absolute maximum power dissipation 25mw maximum operating supply voltage 1.5vdc absolute maximum supply voltage 2vdc
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 5 of 24 3. electrical characteristics table 3-1: electrical characteristics conditions: v bat = 1.25v temperature = 25c parameter symbol conditions min typ max units hybrid current i amp with adaptive features 8khz bandwidth ? 925 ? a i amp with adaptive features 16khz bandwidth ? 1150 ? a minimum operating supply voltage v boff ramp down 0.93 0.95 0.97 v supply voltage turn on threshold v bon ramp up 1.06 1.1 1.16 v eeprom burn cycles ? ? 100k ? ? cycles low frequency system bandwidth ? ? ? 125 ? hz high frequency system bandwidth ? 32khz sampling rate ? 16 ? khz total harmonic distortion thd v in = -40dbv ? ? 1 % thd at maximum input thd m v in = -15dbv, hrx - on ? ? 3 % clock frequency f clk ? 1.945 2.048 2.151 mhz regulator regulator voltage v reg ? 0.87 0.90 0.93 v input input referred noise irn bandwidth 100hz - 8khz ? ? -106 dbv input impedance z in ??16?k ? anti-aliasing filter rejection ? ? = ? clk - 8khz, v in = -40dbv ? 80 ? db maximum input level ? ? ? -15 ? dbv input dynamic range ? hrx - on bandwidth 100hz - 8khz ? 95 ? db a/d dynamic range ? bandwidth 100hz - 8khz ? 86 ? db output d/a dynamic range ? ? ? 83 ? dbv output impedance z out ???15 ?
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 6 of 24 volume control volume control resistance r vc two-terminal connection 160 200 240 k ? r vc three-terminal connection 100 ? 1000 k ? volume control range ? a ? ?42?db sda input logic 0 voltage ? ? 0 ? 0.3 v logic 1 voltage ? ? 1 ? 1.3 v sda output standby pull up current ? ? 1.4 2 2.6 a sync pull up current ? ? 450 500 550 a logic 0 current (pull down) ? ? 225 250 275 a logic 1 current (pull up) ? ? 225 250 275 a synchronization time (synchronization pulse width) t sync baud = 0 237 250 263 s t sync baud = 1 118 125 132 s t sync baud = 2 59 62.5 66 s t sync baud = 3 29.76 31.25 32.81 s t sync baud = 4 14.88 15.63 16.41 s t sync baud = 5 7.44 7.81 8.20 s t sync baud = 6 3.72 3.91 4.10 s t sync baud = 7 1.86 1.95 2.05 s ms input pull down resistance ? ? ? 1 ? m ? logic 1 voltage ? ? v reg ?v b v rising edge threshold ? ? 0.5 0.69 0.9 v falling edge threshold ? ? 0.25 0.45 0.5 v hysteresis ? ? 0.1 0.24 0.4 v table 3-1: electrical characteristics (continued) conditions: v bat = 1.25v temperature = 25c parameter symbol conditions min typ max units
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 7 of 24 4. typical applications all resistors in ohms, all capacitors in farads unless otherwise stated. figure 4-1: test circuit ms2 input pull down resistance ? ? ? 1 ? m ? logic 1 voltage ? ? v reg ?v b v rising edge threshold ? ? 0.5 0.69 0.9 v falling edge threshold ? ? 0.25 0.45 0.5 v hysteresis ? ? 0.1 0.24 0.4 v table 3-1: electrical characteristics (continued) conditions: v bat = 1.25v temperature = 25c parameter symbol conditions min typ max units 3k9 3k9 1k 1k 200k v b lp filter out 16 3 2 14 15 1 54 12 13 6 7 8 9 10 11 programming interface eeprom m u x d/a hbridge peak clipper control a/d a/d a/d clock generator por circuitry wdrc (1,2,4 channels) cross fader mic/telecoil compensation agco f r o n t w a v e feedback canceller noise reduction (128 bands) graphic eq (8 bands) memory select frequency band analysis frequency band synthesis wideband gain tone generator 128 bands voltage regulator volume control pre biquad filters post biquad filters post biquad filters
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 8 of 24 figure 4-2: typical ap plication circuit figure 4-3: typical hearing instrument assembly diagram 12 v b knowles or sonion zero-bias receiver 16 3 2 14 15 1 54 12 13 6 7 8 9 10 11 programming interface eeprom m u x d/a hbridge peak clipper control a/d a/d a/d clock generator por circuitry wdrc (1,2,4 channels) cross fader mic/telecoil compensation agco f r o n t w a v e feedback canceller noise reduction (128 bands) graphic eq (8 bands) memory select frequency band analysis frequency band synthesis wideband gain tone generator 128 bands voltage regulator volume control pre biquad filters post biquad filters post biquad filters t-coil vc zero biased receiver rear mic + front mic + +- cs44 ms switch (n.o.)
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 9 of 24 5. venture overview venture digital is a dsp system with adaptive algorithms that run on the voyageur? hardware platform. this hardw are platform is a combination of a dsp core and a high fidelity audio codec. as well, thinstax pack aging provides easy integration into a wide range of applications from cic to bte. the audio functions implemented on th e codec include tone generation, peak clipping and cross fading between audio paths. the dsp core implements frontwave directional proce ssing, programmable filters, adaptive algorithms, compression, wideband gain, and volume co ntrol. the adaptive algorithms include adaptive noise reduction and adaptive feedback cancellation. the adaptive noise reduction reduces audible noise in a low distortion manner while preserving perceived speech levels. the adaptive feedback canceller reduces acoustic feedback while offering robust performanc e against pure tones. as well, venture contains security features to protect clie nts' intellectual property against device cloning and software piracy. venture utilizes the power and capabilities of voy ageur to deliver advanced features and enhanced performance previously unavailable to a product in its class. this data sheet is part of a set of documents available for this product. please refer to ?getting started with venture digital ?, document #33350, for a list of other documents.
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 10 of 24 6. signal path there are two main audio input signal pa ths. the first path contains the front microphone and second path contains the rear microphone, telecoil or direct audio input as selected by a programmable mux. the front microphone input is intended as the main microphone audio in put for single microphone applications. in frontwave operation, a multimicroph one signal is used to produce a directional hearing instrument response . the two audio inputs are buffered, sampled and converted into digital form using dual a/d converters. the digital outputs are converted into a 32khz or 16khz, 20-bit digital audio signal. further iir filter blocks process the fron t microphone and rear microphone signals. one biquad filter is used to match the re ar microphone's gain to that of the front microphone. after that, another filter is used to provide an adjustable group delay to create the desired polar response pattern during the calibration process. in the telecoil mode gains are trimmed during cal/config process to compensate for microphone/telecoil mismatches. the frontwave block is followed by four cascaded biquad filters: "pre1", "pre2", "pre3" and ?pre4". these filters can be used for frequency response shaping before the signal goes through channel and adaptive processing. the channel and adaptive processing consists of ? frequency band analysis ? 1, 2 or 4 channel wdrc ? 8 logarithmically spaced band frequency shaping (graphic eq) ? 128 frequency band adaptive noise reduction ? frequency band synthesis ? phase cancellation adaptive feedback reduction after the processing the signal goes thro ugh two more biquad filters, "post1" and "post2", the wideband gain and volume control. these biquad filters are followed by the agco block, two more biquad filters, post3" and "post4", and the peak clipper. the last stage in the signal path is the d/a h-bridge.
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 11 of 24 7. functional block description 7.1 adaptive feeback canceller the adaptive feedback canceller (afc) reduces acoustic feedback by forming an estimate of the hearing aid feedback signal and then subtracting this estimate from the hearing aid input. therefore the forward path of the hearing is not affected. unlike adaptive notch filter approach es, venture's afc does not reduce the hearing aid's gain. the afc is based on a time-domain model of the feedback path. venture?s second generation afc exhibits greatly improved resistance to tonal inputs. figure 7-1: adaptive feedback canceller (afc) block diagram 7.2 adaptive noise reduction the noise reduction algorithm is built upon a high resolution 128-band filterbank enabling precise removal of noise. the algorithm monitors the signal and noise activities in these bands, and imposes a carefully calculated attenuation gain independently in each of the 128 bands. the noise reduction gain applied to a given band is determined by a combination of three factors: ? signal-to-noise ratio (snr) ? masking threshold ? dynamics of the snr per band. the snr in each band determ ines the maximum amount of atten uation that will be applied to the band; the poorer the snr, the greater the amount of attenuation. simultaneously, in each band, the masking threshold variations resulting from the energy in other adjacent bands is taken into account. finally, the noise reduction gain is also adjusted to take advantage of the natural masking of 'noisy' bands by speech bands over time. based on this approach, only enough attenua tion is applied to bring the energy in each 'noisy' band to just below the mask ing threshold. this prevents excessive amounts of attenuation from being applied and thereby reduces unwanted artifacts g h' h + - feedback path estimated feedback
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 12 of 24 and audio distortion. the noise reducti on algorithm efficiently removes a wide variety of types of noise, while retaining natural speech quality and level. 7.3 a/d and d/a converters the system's two a/d converters are 2nd-order sigma-delta modulators, which operate at a 2.048mhz sample rate. the system's two audio inputs are pre-conditioned with antialias filtering and programmable gain pre-amplifiers. these analog outputs are over sampled an d modulated to produce two, 1-bit pulse density modulated (pdm) data streams. the digital pdm data is then decimated down to pulse-code modulated (pcm) digital words at the system sampling rate of 32khz. the d/a is comprised of a digital, 3rd-order sigma-delta modulator and an h-bridge. the modulator accepts pcm audi o data from the dsp path and converts it into a 32-times over-sampled, 1-bit pd m data stream, which is then supplied to the h-bridge. the h-bridge is a specialized cmos output driver used to convert the 1-bit data stream into a low-impedance, differential output voltage waveform suitable for driving zero-biased hearing aid receivers. 7.4 hrx head room expander venture has an enhanced head room expander (hrx) circuit, which increases the input dynamic range of venture wit hout any audible artifacts. this is accomplished by dynamically adjusting the preamplifier's gain and the post-a/d attenuation depending on the input level. 7.5 frontwave directionality the frontwave block provides the resources necessary to implement directional microphone processing. the block accepts inputs from both a front and rear microphone and provides a synthesized directional microphone signal as its output. the directional microphone output is obtained by delaying the rear microphone signal and subtracting it fr om the front microphone signal. various microphone response patterns can be obtained by adjusting the time delay. the frontwave circuit also provides a fixed filter for compensating the sensitivity and frequency response differences between microphones. the filter parameters are adjusted during product calibration. a dedicated biquad filter following the frontwave block has been allocated for low frequency equalization to compensate for the 6db/octave ro ll off in frequency response that occurs in directiona l mode. the amount of low frequency equalization that is applied can be determined during product calibration. gennum recomme nds using matched microphones with frontwave, although calibration is fully possible using unmatched microphones.
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 13 of 24 7.6 channel processing figure 7-2 represents the i/o characterist ic of independent agc channel processing. the i/o curve can be divided into four main regions: ? low input level expansion (squelch) region ? low input level linear region ? compression region ? high input level linear region (return to linear) figure 7-2: independent cha nnel i/o curve flexibility the i/o characteristic of the channel pr ocessing can be ad justed in six ways: ? squelch threshold (squelchth) ? low level gain (llgain) ? lower threshold (lth) ? high level gain (hlgain) ? upper threshold (uth) ? compression ratio (cr) to ensure that the i/o characteristics ar e continuous it is necessary to limit adjustment to a maximum of four of the available five parameters. during parameter map creation it is necessary to select four parameters as user adjustable (or fixed) and allow one parameter to be calculated. the squelch region within each channel implements a low level noise reduction scheme (1:2 or 1:3 expansion ratio) for lis tener comfort. this scheme operates in quiet listening environments (programmable threshold) to reduce the gain at very low levels. the number of compression channels is programmable in arkonline and can be 1, 2 or 4. -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 output level (dbv) input level (dbv) low level gain lower threshold compression ratio high level gain upper threshold squelch threshold
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 14 of 24 7.7 telecoil path the telecoil input is calibra ted during the cal/config process. to compensate for the telecoil/microphone frequency response mismatch, a first order filter with 500hz corner frequency is implemented. through arkonline it is possible to implement a telecoil compensation filter with an adjustable corner frequency. to accommodate for the gain mismatch, the telecoil gain is adjusted to match the microphone gain at 500hz or 1khz (defau lt) and is selectab le in arkonline. there is also a telecoil gain adjustment parameter, which can be enabled in arkonline and set in ids that will allow for manual adjustment of the telecoil gain compensation. 7.8 graphic equalizer venture has an 8 band graphic equalizer. the bands are spaced logarithmically, and each one provides up to 24db of gain adjustment in 1db increments. 7.9 biquad filters additional frequency shaping can be achiev ed by configuring generic biquad filters. the transfer function for each of the biquad filters is as follows: b0 + b1 * z -1 + b2 * z -2 h(z) = ______________________ 1 + a1 * z -1 + a2 * z -2 note that the a0 coefficient is hard-wired to always be a 1. the coefficients are each 16 bits in length and include one sign bit, one bit to the left of the decimal point, and 14 bits to the right of the dec imal point. thus, before quantization, the floating-point coefficients must be in the range -2.0 <= x < 2.0 and quantized with the function: round(x * 214) after designing a filter, the quantized coefficients can be entered into the prebiquads or postbiquads tab in the interactive data sheet. the coefficients b0, b1, b2, a1, and a2 are as defined in the transfer function above. the parameters meta0 and meta1 do not have any effect on the signal processing, but can be used to store additional information related to the biquad with which they are associated. the underlying code in th e product components automa tically checks all of the filters in the system for stab ility (that is, the poles have to be within the unit circle) before updating the graphs on the screen or programming the coefficients into the hybrid. if the interactive da ta sheet receives an exception from the underlying stability checking code, it will automatically disable th e biquad being modified and display a warning message. when the filter is made stable again, it can be re-enabled.
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 15 of 24 note also that in some configurations so me of these filters may be used by the product component for microphone/telecoil compensation, low-frequency eq, etc. if this is the case, the c oefficients the user enters in to ids will be ignored and the filter designed by the software will be pr ogrammed instead. fo r more information on filter design refer to biquad filters in paragon? digital hybrid information note, document # 20205. 7.10 volume control the volume control (vc) can be either external or programmable. if vc is programmed for external operation, a variab le resistor should be connected to the 9bit a/d converter. the external vc can be configured to work with either a two-terminal 200k ? variable resistor or a three-terminal 0.1m ? ?1m ? variable resistor. in two-terminal configuration the vc is connected between gnd and the vc input and in three-terminal configuration between gnd, vreg and the vc input. if using two terminal vc, it must be calibrated before use. calibration is not necessary with three terminal connection. hysteresis is built into the volume control circuitry to prevent unintentio nal volume level toggling. a log taper potentiometer is recommended so that gain in db would be linear with potentiometer rotation. the vc has 42db of range. 7.11 agco and peak clipper the output compression-limiting block (agc o) is an output lim iting circuit whose compression ratio is fixed at :1. the threshold level is programmable. the agco module has programmable attack and release time constants. the agco on venture has optional adap tive release functionality. when this function is enabled the release time varies depending on the environment. in general terms the release time becomes faster in environments where the average level is well below the threshold and only brief intermittent transients exceed the threshold. conversely, in environments where the average level is close to the agco threshold the release time applied to portions of the signal exceeding the threshold is longer. the result is an effective low distortion output limiter that clamps down very quickly on momentary transients but reacts more smoothly in loud environments to minimize compression pumping artifacts. the programmed release time is the longest release time ap plied while the fastest release time is 16 times faster than this. for example if a rele ase time of 128ms is selected the fastest release time applied by the agco block is 8ms. for added flexibility, venture also has th e peak clipper block.
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 16 of 24 7.12 memory select switches there are two, two-pole memory select switches available on venture, which allows the user tremendous flexibility in switching between configurations. these switches may be either momentary or static and are configurable to be either pull-up or pull-down through the settings tab in ids. up to four memories can be configured on venture. memory a must always be valid. all memory select options are se lectable via the settings tab in ids. 7.12.1 momentary switch on ms this mode uses a single momentary switch on ms (pin 4) to change memories. using this mode will cause the part to star t in memory a and w henever th e button is pressed the next valid memory will be load ed. when the user is in the last valid memory, a button press will caus e memory a to be loaded. this mode is set by programming the ?mssmode? parameter to ?momentary? and ?donly? to ?disabled?. examples if 4 valid memories abcdabcda? if 3 valid memories abcabca? if 2 valid memories ababa? if 1 valid memories aaa? 7.12.2 momentary switch on ms, static switch on ms2 (jump to last memory) this mode uses a static switch on ms2 (pin 5) and a momentary switch on ms (pin 4) to change memories. if the static switch is open, the part will start in memory a and it will behave like moment ary with the exceptio n memory d will not be used. if the static switch on ms2 is se t to high, the part will automatically jump to memory d (this will happen on startup or du ring normal operation) . in this setup, the momentary switch's state is ignored. this prevents memory select beeps from occurring. when ms2 is set to open, the pa rt will load in the last select memory. this mode is set by programming the ?mssmode? parameter to ?momentary? and ?donly? to ?enabled?. examples if ms2 = open and there are 4 valid memories: abcabca? if ms2 = open and there are 3 valid memories: ababa? if ms2 = high: d?
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 17 of 24 7.12.3 static switch on ms and ms2 this mode uses two static s witches to change memories. table 7-2 describes which memory is selected depending on the state of the switches. in this mode it is possible to jump from any memory to any other memory simply by changing the state of both switches. if both switches are changed simultaneously then the transition will be smooth, otherwise, if one switch is changed and then the other, the part will transiti on to an intermediate memory before reaching the final memory. the part will start in whatever memory the switches are se lecting. if a memory is invalid the part will default to memory a. this mode is set by programming the ?mssmode? parameter to ?static? and ?donly? to ?disabled?. 7.12.4 static switch on ms, static sw itch on ms2 (jump to last memory) this mode uses two static switches to change memories. unlike in the previous example, this mode will switch to the last valid memory when th e static switch on ms2 is high. this means that this mode will only use a maximum of three memories (even if four valid memories are programmed). table 7-3 describes which memory is selected dependi ng on the state of the switches. this mode is set by programming the ?mssmode? parameter to ?static? and ?donly? to ?enabled?. table 7-1: dynamic example with 4 valid memories t = momentary switch is toggled, 0 = open, 1 = high ms2 0001110001000000 ms 0tt0tt0tt00ttttt memoryabcdddcabdbcabca table 7-2: memory selected in static switch on ms and ms2 mode ms ms2 memory open open a high open b (if valid, otherwise a) open high c (if valid, otherwise a) high high d (if valid, otherwise a)
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 18 of 24 in this mode it is possible to jump from any memory to any other memory simply by changing the state of both switches. if both switches are changed simultaneously then the transition will be smooth, otherwise, if one switch is changed and then the other, the part will transiti on to an intermediate memory before reaching the final memory. when ms2 is set high, the state of the switch on ms is ignored. this prevents memory select beeps from occurring w hen switching ms when ms2 is high. the part will start in whatever memory the switches are se lecting. if a memory is invalid, the part will default to memory a. 7.13 audible memory change indicator venture can be programmed to produce tones to indicate a memory change. using the interactive data sheet venture can be configured to either enable or disable the memory change indicator. when the memory change indicator is en abled, there is an option to have a single beep for each memory change or multiple beeps. the amplitude and frequency of the memory change tone can be selected independent of the tone generator settings and can be individually selected for each memory. when the memory change multiple beep is enabled and the memory change tone is enabled, then during a memory change operation the selected tone will beep a code to indica te which memory ha s been selected. the beep sequence will be 160ms on followed by a 160ms off time between the beeps. the memory change beeping code is deciphered in table 7-4 . table 7-3: memory selected in static switch on ms, static switch on ms2 (jump to last memory) mode ms ms2 memory open open a high open b (if valid, otherwise a) open high d high high d table 7-4: the memory change beeping code selected memory number of beeps a1 b2 c3 d4
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 19 of 24 7.14 tone generator the programmable tone generator is capable of producing programmable tones. upon reception of the tone enable instruction, the venture connects the output of the tone generator to the input of the d/ a converter. the programmed tone is then output until a tone disable instruction is issued. when disabled, the normal audio signal is again connected. 7.15 cross fader to minimize potential loud transients when switching between memories, venture uses a cross fader block. when the memory is changed, the audio signal is faded out, followed by the memory select indicator beeps (if enabled), and after switching to the next memory, the audio signal is faded back in. the cross fader is also used when turning the tone g enerator on or off, and during sda programming. 7.16 power-on/power-off behavior and low battery indicator during power-on, the venture hybrid is held in a reset state until the supply voltage (vb) reaches a turn-on threshold. a small portion of the hybrid's internal control logic turns on and monitors the voltage to determine if the supply is stable. once the supply is stable, the entire hybrid is activated and loads its configuration. finally, the audio output turns on by smoothly transitioning to the expected output level. during normal operation, when a low battery condition (below turn on threshold) is detected, the venture hybrid sends out a series of one to seven beeps (each beep is 512ms on and 512m s off) to indicate the battery is low. this will repeat every five minutes until the device reaches the turn-off threshold. the low battery threshold is programmable in ids between 1.0v and 1.2v in 10mv increments. if vb drops below the turn-o ff threshold then the venture hybrid is returned to its reset state and the audio out put is muted. after a reset due to a low battery or a sudden supply transient, the recovery behavior of venture is determined by the selectable reset mode through arkonline.
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 20 of 24 there are four selectable reset modes as follows: 1. shallow-reset mode, which after a low battery shutdown or transient shutdown, will allow the venture hybrid to immediately restart when the supply voltage rises above the turn-on thre shold. the device will restart in the memory that was last active when the shut down occurred. in summary, the device will function until the supply voltage drops below the turn-off threshold, and will recover when the device rises abo ve the turn-on threshold again. 2. deep-reset mode, which after a low battery shutdown or transient shutdown, will not allow the venture hybrid to restar t. once a shut down occurs (i.e. once the supply voltage drops below the turn-off threshold), the device remains off until the supply voltage drops below approximately 0.3v and subsequently rises above the turn-on threshold. in order for the supply to drop below 0.3v, the battery should be disconnected. upon reconnecting the battery (preferably a new battery) the supply voltage will ri se above the turn-o n threshold, and subject to the supply being stable, the device will restart. 3. mixed mode, which is a combination of modes 1 and 2. the device starts up in shallow-reset mode initially, then changes over to deep reset mode after five minutes. 4. transient reboot mode (recommended), which is a more advanced combination of modes 1 an d 2, plus some additiona l intelligence. the device starts up in shallow-reset mode initially , so that after a lo w battery shutdown or transient shutdown, the device immediately restarts when the supply voltage rises above the turn-on threshold. once the device restarts, deep-reset mode is applied and the device operates in the memory that was last active when the shut down occurred. additionally, the maximum output level is reduced through a 2 db reduction of the agco and peak clipper. this operating condition is defined as transient reboot mode. the device operates in transient reboot mode (meaning deep-reset mode and maximum output reduction are applied) while monitoring the supply voltage. if the supply voltage remains above the turn-on threshold for at least 30 seconds, the device is allowed to exit transient reboot mode. the device returns to shallow-reset mode and the maximum output is restored. generally, any low battery shutdown or tr ansient shutdown that occurs while in shallow-reset mode (or while in the shallow-reset mode component of mixed mode or transient reboot mode) will result in the venture hybrid re starting into the memory that was last active when the sh ut down occurred. the venture hybrid has this memory restart capabilit y for up to three memories . a restart in any memory beyond the first thre e memories will cause the device to restart in the initial memory, similar to the behavior when a battery is first connected. the transient reboot mode described above also applies to up to three memories. any additional memories will use the shallow-reset mode behavior, and will restart in the initial memory after a shutdown. in any of the above reset modes, the v enture hybrid can be configured through arkonline to reduce the gain as the ba ttery voltage drops. when the supply voltage falls below the low ba ttery threshold, low battery tones will be emitted and the wideband gain will be reduced by 3db. as the battery voltage continues to drop, the low battery tones will continue and the wideband gain will continue to be reduced. once the turn-o ff threshold is reached, the device will shut down.
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 21 of 24 7.17 software and security venture incorporates security features to protect the device from cloning and against software piracy. these features are: 1. dll protection by password ? this prevents a third party from using ids to reconfigure parts. 2. hybrid authentication by 128-bit fingerprint to identify parts in application software ? this prevents a third part y from cloning a device's eeprom, since the fingerprint can not be overwritten. special functions can be used in fitting software to reject parts that do not match the expected fingerprint. this will prevent the piracy of fitting software. 3. dll to hybrid pairing by using a software key in ark to match product libraries with client software. a part can be "locked" at manufacturing time so that it will only communicate with the library it was programmed with. this prevents a third party from potentially upgrading a device with a different library in ids or other application software. full software support is provided for ev ery stage of development from design to manufacturing to fitting. please refer to the getting started with ark guide , document #27217. 7.18 sda communication venture is programmed via the sda pin using industry standard programming boxes. during parameter changes the main audio signal path of the hybrid is temporarily muted using the cross fader to avoid the generation of disturbing audio transients. once the changes are complete, the main audio path is reactivated. any changes made during programming will be lost at power-off unless they are explicitly burned to eeprom memory. improvements have be en made to the ark softwa re for venture, which will increase communication speed. certain parameters in arkonline can be selected in such a way as to reduce the number of pages that need to be read out. 7.19 power management venture was designed to accommodate high power applications. ac ripple on the supply can cause instantaneous reduction of the battery's voltage, potentially disruption the circuit's function. venture hybrids have a separate power supply and ground connections for the output stage. this allows hearing instrument designers to accommodate external rc filters in order to minimize any ac ripple from the supply line. reducing this ac ripple grea tly improves the stabilit y of the circuit and prevents unwanted reset of the circuit ca used by spikes on the supply line. for more information on properly designing a filter to reduce supply ripple, please refer to information note using the gb3211 paragon digital in high power applications initial design tips , document #24561.
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 22 of 24 8. package dimensions figure 8-1: package dimensions 0.026 (0.660) 0.016 (0.406) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 0.215 (5.46) 0.070 max (1.78) 0.124 (3.15) ga3219 xxxxxx dimension units are in inches. dimensions in parentheses are in millimetres, converted from inches and include minor rounding errors. 1.0000 inches = 25.400mm dimension tolerances: 0.005 (0.13) unless otherwise stated. work order number: xxxxxx this hybrid is designed for either point-to-point manual soldering or for reflow according to gennum's reflow process (information note 521-45).
ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 23 of 24 8.1 pad location pad no. pad position pad dimensions x y xdim (mil) ydim (mil) 1001838 2 -29 -5.75 20 26.5 3 -59.25 -5.75 20.5 26.5 4 -91.5 -8.5 24 21 5 -124 -5.75 19 26.5 6 -154.25 -1.75 21.5 34.5 7 -183.5 -1.75 17 34.5 8 -171.25 33.75 41.5 16.5 9 -182.25 66.5 19.5 29 10 -147 71.5 26 39 11 -113.75 66.5 20.5 49 12-84.5761830 13 -56.25 76 18.5 30 14 -27.25 73.25 18.5 35.5 15 0.5 73.25 17 35.5 16 -12.75 37.25 43.5 16.5 x y xdim (mm) ydim (mm) 1000.4570.965 2 -0.737 -0.146 0.508 0.673 3 -1.505 -0.146 0.521 0.673 4 -2.324 -0.216 0.610 0.533 5 -3.150 -0.146 0.483 0.673 6 -3.918 -0.044 0.546 0.876 7 -4.661 -0.044 0.432 0.876 8 -4.350 0.857 1.054 0.419 9 -4.629 1.689 0.495 0.737 10 -3.734 1.816 0.660 0.991 11 -2.889 1.689 0.521 1.245 12 -2.146 1.930 0.457 0.762 13 -1.429 1.930 0.470 0.762 14 -0.692 1.861 0.470 0.902 15 0.013 2.007 0.432 0.902 16 -0.324 0.946 1.105 0.419
caution electrostatic sensitive devices do not open packages or handle except at a static-free workstation gennum corporation mailing address: p.o. box 489, stn. a, burlington, ontario, canada l7r 3y3 shipping address: 970 fraser drive, burlington, ontario, canada l7l 5p5 tel. +1 (905) 632-2996 fax. +1 (905) 632-5946 gennum japan corporation shinjuku green tower building 27f, 6-14-1, nish i shinjuku, shinjuku-ku, tokyo, 160-0023 japan tel. +81 (03) 3349-5501, fax. +81 (03) 3349-5505 gennum uk limited 25 long garden walk, farnham, surrey, england gu9 7hx tel. +44 (0)1252 747 000 fax +44 (0)1252 726 523 gennum corporation assumes no liability for any errors or omissions in this document, or for the use of the circuits or devices described herein. the sale of the circuit or device described herein does not imply any patent license, and gennum makes no representation that the circuit or device is free from patent infringement. gennum and the g logo are registered trademarks of gennum corporation. ? copyright 2004 gennum corporation. all rights reserved. printed in canada. www.gennum.com ga3219 / ga3218 / GA3217 preliminary data sheet proprietary and confidential 32718 - 2 february 2005 24 24 of 24 document identification preliminary data sheet the product is in a preproduction phase and specifications are subject to change without notice. 9. revision history version ecr date changes and / or modifications 0 134601 october 2004 new document. 1 134970 december 2004 updated to preliminary data sheet. 2 135826 february 2005 hybrid pads dimensions changed.

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