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w WM3100 high performance stereo 2vrms line driver wolfson microelectronics plc t o receive regular email updates, sign up at http://www.wolfsonmicro.com/enews preliminary technical data, october 2010, rev 2.0 copyright ? 2010 wolfson microelectronics plc description the WM3100 is a high performance stereo 2v rms line driver with ground referenced outputs. the device is ideal for cost-sensitive applications requiring line level outputs, minimal external components and small pcb area. the WM3100 offers excellent audio performance. the two high performance amplifiers are capable of driving a wide variety of loads. the device supports single-ended or differential input configurations. the input and feedback resisitors around both amplifiers are integrated within the WM3100, giving a high impedance input and a fixed signal gain of +6.4db. an on-board charge pump is provided to generate the negative supply for the ground-referenced drivers; the charge pump requires only two external capacitors for normal operation. the line outputs can be muted using a hardware control input. a high impedance mute state is also supported, where the outputs are undriven - this is useful in applications where a common external connector is used as an input and an output. the device uses a single 3.3v supply, and is available in a 14- pin soic. features ? 108db snr (?a? weighted) ? -95db thd+n ? 108db dynamic range ? single-ended or differential input ? fixed gain +6.4db ? digital control inputs - mute pin - high impedance output mode ? pop and click suppression ? fast start-up - 200 s start-up from off - 100 s start-up from mute ? 3.3v supply ? 14-pin soic applications ? digital televisions ? dvd players & recorders ? blu-ray disc players ? gaming consoles ? set-top boxes block diagram
WM3100 preliminary technical data w ptd, october 2010, rev 2.0 2 table of contents description ....................................................................................................... 1 features............................................................................................................. 1 applications ..................................................................................................... 1 block diagram ................................................................................................. 1 table of contents ......................................................................................... 2 pin configuration ........................................................................................... 3 ordering information .................................................................................. 3 pin description ................................................................................................ 3 absolute maximum ratings ......................................................................... 4 recommended operating conditions ..................................................... 4 electrical characteristics ...................................................................... 5 terminology ............................................................................................................. 6 device description ......................................................................................... 7 introduction ............................................................................................................ 7 input signal path .................................................................................................... 7 output signal path ................................................................................................ 8 charge pump ............................................................................................................. 9 digital control inputs ......................................................................................... 9 recommended external components .................................................. 10 audio input paths ................................................................................................. 10 audio output paths ............................................................................................. 10 power supply decoupling ................................................................................ 10 charge pump components ................................................................................ 10 recommended external connections .......................................................... 11 package dimensions .................................................................................... 12 important notice .......................................................................................... 13 address: ................................................................................................................... 13
preliminary technical data WM3100 w ptd, october 2010, rev 2.0 3 pin configuration ordering information order code temperature range package moisture sensitivity level peak soldering temperature WM3100ged -40 c to +85 c 14-pin soic msl1 260 c WM3100ged/r -40 c to +85 c 14-pin soic (pb-free, tape and reel) msl1 260 c note: tube quantity = 56 reel quantity = 3000 pin description pin no name type description 1 lineout1 analogue output line output 1 2 lineout2 analogue output line output 2 3 cpvoutn analogue output charge pump output decoupling pin 4 cpcb analogue output charge pump fly-back capacitor pin 5 gnd supply ground 6 cpca analogue output charge pump fly-back capacitor pin 7 vdd supply positive supply pin 8 outmode digital input output mode control pin 0 = normal operation 1 = high impedance mute state 9 mute digital input mute control (only valid when outmode = 0) 0 = output muted 1 = normal operation 10 in2n analogue input inverting input 2 11 in2p analogue input non-inverting input 2 12 in1n analogue input inverting input 1 13 in1p analogue input non-inverting input 1 14 lineref analogue input line output reference (connect to gnd)
WM3100 preliminary technical data w ptd, october 2010, rev 2.0 4 absolute maximum ratings absolute maximum ratings are stress ratings only. permanent damage to the device may be caused by continuously operating at or beyond these limits. device functional operating limits and guaranteed performance specifications are given under electrical characteristics at the test conditions specified. esd sensitive device. this device is manufactured on a cmos process. it is therefore generically susceptible to damage from excessive static voltages. proper esd precautions must be taken during handling and storage of this device. wolfson tests its package types according to ipc/jedec j-std-020b for moisture sensitivity to determine acceptable storage conditions prior to surface mount assembly. these levels are: msl1 = unlimited floor life at <30 c / 85% relative humidity. not normally stored in moisture barrier bag. msl2 = out of bag storage for 1 year at <30 c / 60% relative humidity. supplied in moisture barrier bag. msl3 = out of bag storage for 168 hours at <30 c / 60% relative humidity. supplied in moisture barrier bag. the moisture sensitivity level for each package type is specified in ordering information. condition min max supply voltage (vdd) -0.3v +4.5v voltage range digital inputs gnd -0.3v vdd +0.3v voltage range analogue inputs gnd -0.3v vdd +0.3v operating temperature range, t a -40oc +85oc junction temperature, t jmax -40oc +150oc storage temperature after soldering -65oc +150oc recommended operating conditions parameter symbol min typ max unit supply voltage vdd 2.97 3.3 3.6 v ground gnd 0 v
preliminary technical data WM3100 w ptd, october 2010, rev 2.0 5 electrical characteristics test conditions vdd=3.3v, gnd=0v, t a = +25 o c, 1v rms 1khz sinusoidal input signal unless otherwise stated parameter symbol test conditions min typ max unit analogue inputs maximum full-scale input signal level. (this changes in proportion to vdd.) 1 v rms input resistance r in 24 k ? analogue outputs full-scale output signal level. (this changes in proportion to vdd.) full scale input signal, r l = 10k ? 2.1 v rms dc offset 0 3 mv minimum load resistance r l 2.5 k ? maximum load capacitance without external rc filter 220 pf with recommended external rc filter 1 f audio performance signal to noise ratio snr a-weighted, 20hz to 20khz 108 db unweighted, 20hz to 20khz 104 total harmonic distortion + noise (2.1v rms output, 10k ? load) thd+n single-ended inverting input -91 db single-ended non-inverting input -95 differential input -92 dynamic range dnr a-weighted, -60dbv input 108 db channel separation (l/r) 1khz 90 db 20hz to 20khz 80 channel level matching 1khz 0.1 db channel phase deviation 1khz 0.1 degree gain 6.2 6.4 6.6 db power supply rejection ratio (vdd) psrr 100mv pk-pk, 1khz 69 db 100mv pk-pk, 20hz to 20khz 50 mute attenuation mute = 0 70 db output impedance (high impedance mute state) outmode = 1 50 k ? internal low-pass filter 3db cut-off 300 khz start-up time (from off) 200 s start-up time (from mute) 100 s
WM3100 preliminary technical data w ptd, october 2010, rev 2.0 6 terminology 1. signal-to-noise ratio (db) ? snr is a measure of the difference in level between the maximum full scale output signal and the output with no input signal applied. (note that this is measured without any mute function enabled.) 2. total harmonic distortion (db) ? thd is the level of the rms value of the sum of harmonic distortion products relative to the amplitude of the measured output signal. 3. total harmonic distortion plus noise (db) ? thd+n is the level of the rms value of the sum of harmonic distortion products plus noise in the specified bandwidth relative to the amplitude of the measured output signal. 4. dynamic range (db) - dnr is a measure of the difference between the maximum full scale output signal level and the sum of all harmonic distortion products plus noise with a low level input signal applied. typically, an input signal level 60db below full scale is used. 5. channel separation (l/r) (db) ? left-to-right and right-to-left channel separation is the measured signal level in the idle channel at the test signal frequency relative to the signal level at the output of the active channel. the active channel is configured and supplied with an appropriate input signal to drive a full scale output, with signal measured at the output of the associated idle channel. 6. mute attenuation ? this is a measure of the difference in level between the full scale output signal and the output with mute applied. 7. all performance measurements carried out with 20khz low pass filter and, where noted, an a-weighted filter. failure to use such a filter will result in higher thd and lower snr readings than are found in the electrical characteristics. the low pass filter removes out of band noise; although it is not audible it may affect dynamic specification values.
preliminary technical data WM3100 w ptd, october 2010, rev 2.0 7 device description introduction the WM3100 is a high-performance stereo line driver designed for digital televisions, dvd, blu-ray, set-top box and gaming applications. it is packaged in a 14-pin soic. the device comprises two fixed gain analogue channels. input signals up to 1v rms are supported, in single-ended or differential configurations. the output driver drives up to 2.1v rms , assuming a 3.3v supply. the inputs and outputs to the WM3100 are ground-referenced; an integrated charge pump circuit generates the required negative supply rail from the single vdd supply. the analogue outputs can be muted under control of a digital logic input. the outputs can also be set to a high impedance state, supporting applications where a common external connector is used as an input and an output. input signal path the WM3100 supports two line input channels, which can each be used in single-ended or differential circuit configurations, as illustrated in figure 1, figure 2 and figure 3. the signal gain is 6.4db in each case. the input capacitor must be correctly selected as it affects the low cut-off frequency of the input circuit. a low cut-off frequency is desirable as it means that there is no significant filtering of the 20hz to 20khz audio frequency bandwidth. typically, the 3db cut-off frequency for the line input should be around 10hz. the WM3100 input impedance is 24k (see ?electrical characteristics?). using the equations below, it follows that the ac coupling capacitors should be approximately 1 f (which gives a 3db cut-off frequency around 7hz). figure 1 single-ended line input (inverting) figure 2 single-ended line input (non-inverting)
WM3100 preliminary technical data w ptd, october 2010, rev 2.0 8 figure 3 differential line input output signal path the WM3100 provides two line output channels, which each support a peak output voltage of 2.97v (6.4dbv or 2.1v rms sine wave) when operating with a 3.3v supply. the line outputs are ground-referenced, removing the requirement for dc-blocking capacitors. the WM3100 provides an internal low-pass filter (lpf) on the output paths. it is also recommended to connect an external analogue low pass filter to the output pins. this ensures that all out-of-band noise is filtered, and improves the maximum load capacitance rating, as noted in the ?electrical characteristics?. there are many suitable lpf architectures, but a simple rc filter is recommended, as illustrated in figure 4. the filter shown here has a -3db cut-off frequency of approximately 105khz, and a droop of -0.15db at 20khz. figure 4 line output low pass filter
preliminary technical data WM3100 w ptd, october 2010, rev 2.0 9 charge pump the WM3100 incorporates a charge pump circuit, which generates the negative supply rail for the line output drivers. the charge pump is powered from vdd, and generates the negative supply cpvoutn. the switching clock for the charge pump is generated internally. the external connections for the charge pump are illustrated in figure 5. a fly-back capacitor is connected between the cpca and cpcb pins. a de-coupling capacitor is required on cpvoutn. note that an input decoupling capacitor is also recommended on the vdd pin. figure 5 external connections for charge pump digital control inputs the WM3100 supports two digital control inputs, as described below. the outmode pin selects between normal operation and high-impedance mute state. a logic ?1? input selects the high-impedance state, in which the outputs are muted and un-driven. this mode enables the external connectors to support other functions without interference from the WM3100 drivers. a logic ?0? input selects normal operation. the mute pin selects betw een normal operation and muted output mode. this is an ?active low? input pin. a logic ?0? input enables the mute function. a logic ?1? input selects normal operation. note that the mute pin has no function w hen the outmode pin is asserted. the digital control inputs are summarised in table 1. input description outmode output mode control pin 0 = normal operation 1 = high impedance mute state mute mute control (only valid when outmode = 0) 0 = output muted 1 = normal operation table 1 digital control inputs
WM3100 preliminary technical data w ptd, october 2010, rev 2.0 10 recommended external components audio input paths a dc-blocking input capacitor is required on each input pin that is used. a single capacitor is required for a single-ended connection; for differential connection, a capacitor is required on both input pins. unused input pins must be connected to ground. for typical applications, a 1 f capacitor is recommended. tantalum electrolytic capacitors are particularly suitable as they offer high stability in a small package size. audio output paths an analogue low-pass filter is recommended on each line output. a simple rc filter comprising a 560? resistor and a 2.7nf capacitor is suitable. ceramic capacitors with c0g / np0 dielectric are recommended. power supply decoupling power supply decoupling is required on vdd. a 4.7 f capacitor is recommended. decoupling capacitors should be placed as close as possible to the WM3100 device. the connection between gnd, the vdd decoupling capacitor and the main system ground should be made at a single point as close as possible to the gnd pin of the WM3100. due to the wide tolerance of many types of ceramic capacitors, care must be taken to ensure that the selected components provide the required capacitance across the required temperature and voltage ranges in the intended application. for most application the use of ceramic capacitors with capacitor dielectric x5r is recommended. charge pump components a fly-back capacitor is required between the cpca and cpcb pins. the required capacitance is 2.2 f. a decoupling capacitor is required on cpvoutn; the recommended value is 1 f. the positioning of the charge pump capacitors is important, particularly the fly-back capacitor. the use of short and wide pcb tra cks for the fly-back c apacitor connections will give best results due to its low resistance. both capacitors should be placed as close as possible to the WM3100. due to the wide tolerance of many types of ceramic capacitors, care must be taken to ensure that the selected components provide the required capacitance across the required temperature and voltage ranges in the intended application. for most application the use of ceramic capacitors with capacitor dielectric x5r is recommended.
preliminary technical data WM3100 w ptd, october 2010, rev 2.0 11 recommended external connections the recommended external connections to the WM3100 are illustrated in figure 6. WM3100 in1p in2n in2p in1n lineout2 lineout1 cpca cpvoutn cpcb 2.2 f 1 f 1 f vdd 4.7 f 1 f gnd mute outmode 2.7nf 560 ? 560 ? 2.7nf lineref vdd supply digital control inputs line input 1 line input 2 line output 1 line output 2 1 f 1 f figure 6 recommended external connections
WM3100 preliminary technical data w ptd, october 2010, rev 2.0 12 package dimensions notes: a. all linear dimensions are in millimeters (inches). b. this drawing is subject to change without notice. c. body dimensions do not include mold flash or protrusion, not to exceed 0.25mm (0.010in). d. meets jedec.95 ms-012, variation = ab. refer to this specification for further details. symbols dimensions (mm) dimensions (inches) min max min max a 1.35 1.75 0.0532 0.0688 a1 0.10 0.25 0.0040 0.0098 b 0.33 0.51 0.0130 0.0200 c 0.19 0.25 0.0075 0.0098 d 8.55 8.75 0.3367 0.3444 e 3.80 4.00 0.1497 0.1574 e 1.27 bsc 0.05 bsc h 5.80 6.20 0.2284 0.2440 h 0.25 0.50 0.0099 0.0196 l 0.40 1.27 0.0160 0.0500 0 o 8 o 0 o 8 o ref: jedec.95, ms-012 0.10 (0.004) seating plane dm001.c e d: 14 pin soic 3.9mm wide body h b d a a1 c h x 45 o -c- 8 7 1 14 l e
preliminary technical data WM3100 w ptd, october 2010, rev 2.0 13 important notice wolfson microelectronics plc (?wolfson?) products and services are sold subject to wolfson?s terms and conditions of sale, delivery and payment supplied at the time of order acknowledgement. wolfson warrants performance of its products to the specifications in effect at the date of shipment. wolfson reserves the right to make changes to its products and specifications or to discontinue any product or service without notice. customers should therefore obtain the latest version of relevant information from wolfson to verify that the information is current. testing and other quality control techniques are utilised to the extent wolfson deems necessary to support its warranty. specific testing of all parameters of each device is not necessarily performed unless required by law or regulation. in order to minimise risks associated with customer applications, the customer must use adequate design and operating safeguards to minimise inherent or procedural hazards. wolfson is not liable for applications assistance or customer product design. the customer is solely responsible for its selection and use of wolfson products. wolfson is not liable for such selection or use nor for use of any circuitry other than circuitry entirely embodied in a wolfson product. wolfson?s products are not intended for use in life support systems, appliances, nuclear systems or systems where malfunction can reasonably be expected to result in personal injury, death or severe property or environmental damage. any use of products by the customer for such purposes is at the customer?s own risk. wolfson does not grant any licence (express or implied) under any patent right, copyright, mask work right or other intellectual property right of wolfson covering or relating to any combination, machine, or process in which its products or services might be or are used. any provision or publication of any third party?s products or services does not constitute wolfson?s approval, licence, warranty or endorsement thereof. any third party trade marks contained in this document belong to the respective third party owner. reproduction of information from wolfson datasheets is permissible only if reproduction is without alteration and is accompanied by all associated copyright, proprietary and other notices (including this notice) and conditions. wolfson is not liable for any unauthorised alteration of such information or for any reliance placed thereon. any representations made, warranties given, and/or liabilities accepted by any person which differ from those contained in this datasheet or in wolfson?s standard terms and conditions of sale, delivery and payment are made, given and/or accepted at that person?s own risk. wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person. address: wolfson microelectronics plc 26 westfield road edinburgh eh11 2qb united kingdom tel :: +44 (0)131 272 7000 fax :: +44 (0)131 272 7001 email :: sales@wolfsonmicro.com

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