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1 avpro ? 5002b dual scart a/v switch august 2000 description the avpro ? 5002b device is an audio/video switching ic that supports an input/output port, an input only port, and an output only port. the device includes multiplexers that allow the inputs to be routed to the outputs in various configurations. additional outputs are provided to drive an external rf modulator. the video outputs of the multiplexers are buffered to drive 137ohm loads. the audio outputs are buffered to provide 2 vrms output into 600 ohms. the 5002b has features optimized for bskyb satellite receiver applications, but it can also be used in other applications that require control of multiple audio and video sources. features two scart connections (auxiliary, tv) video section - integrated output drivers - rgb, svhs, composite outputs - programmable rgb gain audio section - 5-bit audio attenuation, 0 to -31 db - auxiliary tone inputs to support bskyb - ground based outputs (no ac coupling caps) serial port control of switching i 2 c bus 64-lead lqfp package block diagram aux_lin rin lin aux_rin aux_rout aux_lout sclk sdata enc_b enc_g enc_r aux_ycout aux_b aux_g aux_yc tv_b tv_g tv_r tv_ycout eblank ablank blank gnd enc_yc do_1 do_0 aux_cout aux_r mod_yc +5 v d c rbias vref support circuits tgen -5 v d c enc_c enc_y audio1 tv_fnc -5 v d c + 12vd c rout lout tv_rout tv_lout mod_mono +5 v d c +5 v d c +5 v d c -5 v d c mux mux audio2 serial port gnd gnd gnd volume control other i/o aux_fnc
avpro ? 5002b dual scart a/v switch 2 functional description the 5002b is an audio/video switching device. the device integrates both audio and video drivers so that it can directly drive the scart interface. the use of a -5 volt supply eliminates the need for ac coupling capacitors on the audio outputs. all programmable functions of the device are controlled through a standard i 2 c serial interface and a set of internal registers. this device will interface to an external video encoder that provides six video outputs. in addition, the 5002b includes two programmable digital outputs and inputs for the tv scart audio /video. scart video switching the device is designed to accept video signals from an auxiliary scart connector, tv scart connector, and an external video encoder/dac device. the device includes a set of analog multiplexers that receive video signals from these sources and allows routing of the signals to the various video outputs. the video output drivers have a nominal gain of 1.83 v/v to allow for a series resistance of 62 ohms prior to the 75 ohm termination. a block diagram of the video switching function is provided in figure 1. details of the register settings are provided in the section titled ?serial port register tables?. figure 1: 5002b video switching block diagram enc_b enc_g enc_r aux_ycout aux_b aux_g aux_yc tv_b tv_g tv_r tv_ycout eblank ablank blank enc_yc aux_cout aux_r mod_yc enc_c enc_y tv_fnc mux vgen aux_fnc comparator 0v 2v mux mux mux mux mux mux gain mux
avpro ? 5002b dual scart a/v switch 3 tv rgb outputs the device accepts rgb video signals from two sources. the aux_r , aux_g , aux_b input pins are typically connected to the auxiliary scart connector. the enc_r , enc_g , enc_b input pins are connected to the rgb outputs of an external video encoder device. these outputs are used as a video source for the tv scart pins tv_r , tv_g , and tv_b . the rgb video source is selected by setting the lower three (3) bits of serial port register 1. when these bits are set to xxxxxx00, the rgb source will be the encoder. when these bits are set to xxxxxx01, the source will be the auxiliary port. rgb gain: the gain of the rgb outputs can be adjusted to one of four different levels. bits 4 and 5 in register 2 set the gain of the rgb output amplifiers according to the following table: bit 5 bit 4 rgb amplifier gain 0 0 1 1 0 1 0 1 gain = 1.83v/v = a 0 gain = a 0 - 10% gain = a 0 - 20% gain = a 0 - 30% dc restore: the device will generate a dc restore level on each video output based on timing referenced to a horizontal sync pulse. when the sync pulse is detected, the dc restore circuit will act to position the blank level to 0.6 v at the respective video output load. the device can be programmed to look for the horizontal sync pulse on all of the rgb input pins or on the associated composite video input pin ( aux_yc for the auxiliary port or enc_yc for the external encoder). bit 7 of register 1 determines the horizontal sync source. at power-up, this bit defaults to a low (0) state which programs the device to look for a sync detect on the rgb input signals. in this mode, the device can detect a horizontal sync on any of the three rgb input signals. when bit 7 is set to a high (1) state, the device will look for a sync detect from the signal on either the aux_yc or enc_yc pin depending on which source is selected. blanking : the signal on the blank output pin is determined by the state of two msbs in register 2 according to the following table: bit 7 bit 6 blank source 0 0 1 1 0 1 0 1 blank = ablank blank = eblank blank = 0v blank = 4v @ ic output pin the user must insure that the source of the blank output is the same as the source for the rgb outputs, i.e. ablank is selected when the auxiliary rgb is active and eblank is selected when the encoder rgb is active. tv composite output the device provides inputs for two composite video sources that can be switched to the tv scart composite video pin, tv_ycout . the aux_yc input pin is typically connected to the ?video in? pin on the auxiliary scart connector. the enc_yc input pin is typically connected to the ?yc? or ?cvbs? output from the external video encoder device. selection of the video source for the tv composite output is accomplished when the rgb video source is selected (see the register tables). tv svhs output mode the device supports svhs video format. the svhs mode is selected for the tv scart using the lower three (3) bits of register 1. when the svhs mode is selected, the tv_ycout pin will provide the luminance signal output from the selected source. the chroma output will be provided on the tv_r pin. the video source for svhs mode can be either the auxiliary port or the encoder port. when the auxiliary port is selected as the video source, the video on aux_r will be provided at the tv_r output pin and the aux_yc video will be provided at the tv_ycout pin. the device will support svhs mode for three encoder interface formats. the first encoder interface format accepts chroma signals on the enc_c pin and luma signals on the enc_y pin for the "svhs, enc 1" mode. the second format will receive chroma information on the enc_b pin and luma information on enc_g . this format is designated "svhs, enc 2". the third format will receive chroma information from the enc_r pin and luma information from the enc_g pin. this mode is designated ?svhs, enc 3?. when the svhs mode is selected, the dc restore on the tv_r pin will average to approximately 1.68 vdc at the output pin. the dc restore circuit will act to position the blank level to 0.6 v at the tv_ycout video output load. the tv_g and tv_b outputs will be set to 0 vdc when the svhs mode is active. rf modulator output the device provides an output, mod_yc , to drive an external rf modulator. this output is driven by the enc_yc input at all times.
avpro ? 5002b dual scart a/v switch tv video mute all tv video outputs can be simultaneously disabled by programming the lower three (3) bits in register 1. the power-up default condition is xxxxx111, which sets all tv video outputs to 0 vdc and switches the tv audio outputs to aux_lin/ aux_rin . setting these bits to xxxxx110 will also mute the tv video outputs and switch the tv audio outputs to lin/ rin . auxiliary composite output the auxiliary port includes a composite video output pin ( aux_ycout ) that is typically connected to the ?video out? pin on an auxiliary scart connector. bits 3-5 in register 1 determine the source for the aux_ycout pin. when these bits are set to xx000xxx, the video source will be the enc_b input. when these bits are set to xx001xxx, the video source will be the enc_yc input. auxiliary svhs output mode the device also includes an output pin ( aux_cout ) that provides a chroma output to pin 15 (red) on the auxiliary scart connector. when connected with the aux_r pin, this forms a bi-directional port as shown in the following diagram: using this configuration, the device will support svhs mode for three encoder interface formats. the first encoder interface format will receive chroma information from the enc_c pin and luma information from the enc_y pin. this format is designated ?svhs, enc 1?. the second format will receive chroma information on the enc_b input and luma information on enc_g . this format is designated "svhs, enc 2". the third format will receive chroma information from the enc_r pin and luma information from the enc_g pin. this mode is designated ?svhs, enc 3? on the serial port register table. when the svhs mode is selected, the dc restore on the aux_cout pin will average to approximately 0.9 vdc at the video output load. the dc restore on the aux_ycout pin will set the blank level to 0.6 v at the video output load. auxiliary video mute all auxiliary video outputs can be simultaneously disabled by programming bits 3-5 in register 1. the power-up default condition is xx111xxx, which sets all auxiliary video outputs to 0 vdc and switches the auxiliary audio outputs to lin/ rin . setting these bits to xx110xxx will also mute the auxiliary video outputs. function switching the device provides functions switching pins for both the auxiliary ( aux_fnc ) and tv ( tv_fnc ) scart ports. both of these pins are bi-directional. the direction of the pins is determined by setting bits in register 2 according to the following table: bits aux_fnc tv_fnc xxxx 00 xx output output xxxx01xx output input xxxx10xx input output xxxx11xx passthru i/o passthru o/i for the case where register 2 is set to xxxx11xx, the input signal on the aux_fnc pin is passed directly through to the tv_fnc pin as an output, or vice versa. this mode is useful for supporting a system power down mode where all signals from the auxiliary port are passed directly through to the tv port. when a function pin is set as an input, the voltage on that pin is applied to an internal comparitor. the comparitor sense the voltage on the input pin and sets the two (2) lsbs in the read register according to the following table: input voltage bits function < 4.0 v xxxxxx00 normal tv 4.0 to 8.0v xxxxxx01 16:9 aspect >8.0 v xxxxxx10 peritelevision mux aux_r aux_cout 62 auxiliary scart pin 15 mux
avpro ? 5002b dual scart a/v switch 5 when a function pin is set as an output, the output level for the pin is determined by the state of the two lsbs register 2, according to the following table: bits output voltage function xxxxxx 00 ~0 v normal tv xxxxxx01 ~6 v 16:9 aspect xxxxxx10 ~ 11 v peritelevision xxxxxx11 ~ 11 v peritelevision the function output circuit includes short circuit protection. when a function pin is in the 6v or 11v output mode, if the scart connection is shorted to ground, then the output is disabled. likewise, when a function pin is in the 0v output mode, if the scart connection is connected to a voltage source, then the output is disabled. the load for the function outputs is designed to be 10k or higher. note that both the aux_fnc pin and the tv_fnc pin can be set as outputs simultaneously, however they will have the same output voltage. figure 2: 5002b audio switching block diagram aux_rin aux_lout a b mux aux_rout mux mux mux aux_lin lin rin audio1 audio2 a attenuator: a = 0 or 20 db attenuation volume control: b = 0 to 31 db attenuation lout tv_lout mux mux a b mux mux tv_rout rout mod_mono a mux mux mux mux mux
avpro ? 5002b dual scart a/v switch scart audio switching the audio inputs are considered to be associated with the respective video inputs. as a result, the video selection determines which audio signals will be switched to a given scart output. refer to the serial port register table for more information. also see the audio switching block diagram shown in figure 2. the 5002b provides inputs for the auxiliary audio source ( aux_lin / aux_rin ) and the stereo dac associated with the video encoder inputs ( lin / rin ). tv audio operation the audio source for the tv port is selected in concert with the video source using the three (3) lsbs of register 1. the selected audio signals are input to internal multiplexers that allow the user to select between mono and stereo output options. bits 4 and 5 of register 3 control the stereo/mono selection according to the following table: bit 5 bit 4 tv_lout source tv_rout source 0 0 left input right input 0 1 left + right left + right 1 0 left input left input 1 1 right input right input at power-up, these bits default to 00 putting the device in the stereo mode. the outputs of these multiplexers are then passed through a pair of programmable attenuators that are controlled by the two (2) msbs of register 4. these register bits provide the following control of the left and right audio channels: bit 7 bit 6 left and right channel levels 0 0 attenuation = 0 db 0 1 attenuation = 20 db 1 x both channels disabled the output of these attenuators are then summed with an audio signal created by summing two additional audio inputs. these additional audio inputs are labeled audio1 and audio2 on the block diagram. the purpose of these pins is to allow externally generated tones to be mixed with the tv audio signal source. the state of these two inputs is controlled by bits 3- 5 of register 4. at power-up reset, bit 3 is set to a high level (1) which disables the audio1 input. setting this bit low (0) enables the input. the audio2 input passes through a programmable attenuator prior to being summed with the audio1 input. bits 4 and 5 of register 4 control the level of audio2 according to the following table: bit 5 bit 4 audio2 mode 0 0 audio 2 level = 0 db attenuation 0 1 audio 2 level = 20 db attenuation 1 x audio 2 input disabled at power-up, bits 4 and 5 are set high (11) so that the input is disabled. the sum of the audio1 and audio2 signals is then internally summed with each of the left and right tv audio signals. volume control: the resulting left and right tv audio channels are then passed through a volume control circuit. the lower 6-bits in serial port register 0 set a programmable attenuation level. the attenuation is linear at 1 db per step with a setting of xx000000 producing 0 db attenuation and a setting of xx011111 producing 31 db of attenuation. tv scart audio outputs: the first pair of signals is labeled tv_lout and tv_rout on the block diagram. tv_lout and tv_rout are typically used to drive the tv scart audio pins. these outputs also have an internal multiplexer that allows the user to select tv audio either before or after the internal volume control function. when bit 0 in register 4 is set low (0), the volume control is used. when this bit is set high (1), the volume control is bypassed. the power-up default state is volume control active. tv audio line outputs: the second pair of signals is labeled lout and rout on the block diagram. lout and rout are standard line outputs. the lout / rout outputs have an internal multiplexer that allows the user to select tv audio either before or after the internal volume control function. when bit 1 in register 4 is set low (0), the volume control is used. when this bit is set high (1), the volume control is bypassed. the power-up default state is volume control active. rf mono output: the lin and rin input signals are summed internally to generate a mono audio signal for an external rf modulator. this output is labeled mod_mono . this mono signal can also be mixed with the audio1 and audio2 . the switching of the audio1 and audio2 signals on this pin is controlled by the same bits that control the tv audio outputs. the internal summing circuit is before the volume control mux so the mod_mono output level cannot be adjusted.
avpro ? 5002b dual scart a/v switch 7 tv audio mute: a mute function is provided for all tv audio outputs. the mute function is controlled by setting bit 6 in register 0. when this bit is set to a high state(1), all tv audio outputs are attenuated to at least -60 db. this will be the default condition at power-up. when the bit is set to a low state(0), the audio path will be in normal operating mode. this bit can be set independent of the volume control such that the outputs can be muted before any change in volume, or any switching of audio sources. auxiliary audio operation the auxiliary port includes stereo audio outputs for a scart connector ( aux_lout , aux_rout ). the audio inputs lin and rin are the only sources that can be switched to the auxiliary audio outputs for the 5002b device. the audio inputs are switched in concert with the associated video inputs according to bits 3- 5 in register 1. internal multiplexers allow the aux_lout and aux_rout outputs to be configured into either stereo or mono audio outputs. the two msbs of register 3 control the stereo/mono selection according to the following table: bit 7 bit 6 aux_lout source aux_rout source 0 0 lin rin 0 1 lin+rin lin+rin 1 0 lin lin 1 1 rin rin at power-up, these bits default to 00 putting the device in the stereo mode. the auxiliary audio outputs can be muted by setting the msb in register 0. this bit is set high(1) at power-up causing the outputs to be muted. setting this bit low(0) enables all auxiliary audio outputs. digital outputs the 5002b provides two programmable digital outputs, do_0 and do_1 . these pins are general purpose outputs programmed by setting bit 0 and 1 in register 3. setting the register bits to 0 puts these outputs in the logic low state. setting the register bits to 1 puts the outputs in the logic high state. internal pull-up resistors (approximately 30k) are included on these pins. serial port definition internal functions of the device are monitored and controlled by a standard inter-ic (i 2 c )bus. the serial port operates in a slave mode only and can be written to or read from. the default address of the device is 1001000x. data transfers a data transfer starts when the sdata pin is driven from high to low by the bus master while the sclk pin is high. on the following eight clock cycles, the device receives the data on the sdata pin and decodes that data to determine if a valid address has been received. the first seven bits of information are the address with the eighth bit indicating whether the cycle is a read (bit is high) or a write (bit is low). if the address is valid for this device, on the falling sclk edge of the eighth bit of data, the device will drive the sdata pin low and hold it low until the next rising edge of the sclk pin to acknowledge the address transfer. the device will continue to transmit or receive data until the bus master has issued a stop by driving the sdata pin from low to high while the sclk pin is held high write operation: when the read/write bit (bit 8) is low and a valid address is decoded, the device will receive data from the sdata pin. the device will continue to latch data into the registers until a stop condition is detected. the device generates an acknowledge after each byte of data written. read operation: when the read/write bit (bit 8) is high and a valid address is decoded, the device will transmit the data from the internal register on the following eight sclk cycles. following the transfer of the register data and the acknowledge from the master, the device will release the data bus. reset: at power-up the serial port defaults to the states indicated in boldface type. the device also responds to the system level reset that is transmitted through the serial port. when the master sends the address 00000000 followed by the data 00000110, the device resets to the default condition. the device also generates an acknowledge.
avpro ? 5002b dual scart a/v switch serial port register tables read register device address = 10010001 function bits description function control input xxxxxx00 xxxxxx01 xxxxxx10 tv_fnc or aux_fnc pin level = level 0 ( ~0v) tv_fnc or aux_fnc pin level = level 1a ( ~6.0v) tv_fnc or aux_fnc pin level = level 1b (~12v) tv_ycout video sync xxxxx0xx xxxxx1xx tv ycout: no sync pulse present tv ycout: sync pulse present aux_ycout video sync xxxx0xxx xxxx1xxx aux ycout: no sync pulse present aux ycout: sync pulse present device id code 0010xxxx this code identifies the device type as the 5002b write registers : device address = 10010000 ( bold indicates default setting) register 0: audio control register a function bits description tv volume control xx 000000 xx011111 tv audio volume = normal (0 db attenuation) tv audio volume = minimum (31 db attenuation) tv audio mute x0xxxxxx x 1 xxxxxx tv audio ( tv_lout/ tv_rout, lout/rout, mod_mono ) output = normal audio output tv audio ( tv_lout/ tv_rout, lout/rout, mod_mono ) output = muted by 60 db aux audio mute 0xxxxxxx 1 xxxxxxx aux audio ( aux_lout/ aux_rout ) output = normal audio output aux audio ( aux_lout/ aux_rout ) output = muted by 60 db
avpro ? 5002b dual scart a/v switch 9 register 1: audio/video control register ; audio/video source select bits tv a/v source bits tv_r tv_g tv_b tv_yc mod_yc l,rout rgb/yc, encoder rgb/yc, auxiliary svhs, enc 1 svhs, enc 2 svhs, enc 3 svhs, aux 1 tv mute tv mute xxxxx000 xxxxx001 xxxxx010 xxxxx011 xxxxx100 xxxxx101 xxxxx110 xxxxx 111 enc_r aux_r enc_c enc_b enc_r aux_r 0v 0v enc_g aux_g 0v 0v 0v 0v 0v 0v enc_b aux_b 0v 0v 0v 0v 0v 0v enc_yc aux_yc enc_y enc_g enc_g aux_yc 0v 0v enc_yc enc_yc enc_yc enc_yc enc_yc enc_yc 0v 0v lin, rin auxlin,rin lin, rin lin, rin lin, rin auxl,rin lin, rin auxl,rin aux a/v source bits aux_cout aux_ycout aux_lout, rout composite, enc 1 composite, enc 2 composite, enc 2 svhs, enc 1 svhs, enc 2 svhs, enc 3 aux mute aux mute xx000xxx xx001xxx xx010xxx xx011xxx xx100xxx xx101xxx xx110xxx xx 111 xxx off off off enc_c enc_b enc_r 0v 0v enc_b enc_yc enc_yc enc_y enc_g enc_g 0v 0v lin, rin lin, rin lin, rin lin, rin lin, rin lin, rin lin, rin lin, rin function bits description not used x 0 xxxxxx reserved, set to 0 for normal operation rgb sync source 0 xxxxxxx 1xxxxxxx rgb sync /dc restore source = rgb rgb sync /dc restore source = tv_yc
avpro ? 5002b dual scart a/v switch register 2: video control register; video function bits function bits description function control output voltage xxxxxx 00 xxxxxx01 xxxxxx10 xxxxxx11 level 0; normal tv output (function voltage = 0v) level 1a; 16:9 aspect ratio (function voltage = 6v) level 1b; peritelevision output mode (function voltage = 11v) level 1b; peritelevision output mode (function voltage = 11v) function pins control* xxxx00xx xxxx01xx xxxx10xx xxxx11xx aux_fnc pin = output, tv_fnc pin = output aux_fnc pin = output, tv_fnc pin = input aux_fnc pin = input, tv_fnc pin = output signals will pass through from aux_fnc to tv_fnc or vice versa. rgb gain control xx 00 xxxx xx01xxxx xx10xxxx xx11xxxx rgb output amplifier gain = normal rgb output amplifiers attenuated by 10% rgb output amplifiers attenuated by 20% rgb output amplifiers attenuated by 30% blank output selection 00 xxxxxx 01xxxxxx 10xxxxxx 11xxxxxx blank = ablank blank = eblank blank = 0v blank = 4v @ ic output pin * functi on pin voltages: (i) in output mode are defined by the two lsb of register 2, (ii) in input mode set the state of the two lsb of the read register. digital read is not meaningful in the pass-through mode ( xxxx11xx ). register 3: audio control register b function bits description d0 output control xxxxxxx 0 xxxxxxx1 d0 output = 0 (low) d0 output = 1 (high) d1 output control xxxxxx 0 x xxxxxx1x d1 output = 0 (low) d1 output = 1 (high) not used xxxx 00 xx reserved, set to 0 for normal operation tv stereo/mono control xx 00 xxxx xx01xxxx xx10xxxx xx11xxxx tv audio mode: stereo tv audio mode: mono (sum l+r) on both tv_lout/ tv_rout tv audio mode: l channel on both tv_lout/ tv_rout tv audio mode: r channel on both tv_lout/ tv_rout aux stereo/mono control 00 xxxxxx 01xxxxxx 10xxxxxx 11xxxxxx aux audio mode: stereo aux audio mode: mono (sum l+r) on both aux_lout/ aux_rout aux audio mode: l channel on both aux_lout/ aux_rout aux audio mode: r channel on both aux_lout/ aux_rout
avpro ? 5002b dual scart a/v switch 11 register 4: audio control register c function bits description tv volume control select 1 xxxxxxx 0 xxxxxxx1 volume control on tv_lout, tv_rout tv_lout, tv_rout bypass the volume control tv volume control select 2 xxxxxx 0 x xxxxxx1x volume control on lout, rout lout, rout bypass the volume control not used xxxxx 0 xx reserved, set to 0 for normal operation audio1 control ( note 1 ) xxxx0xxx xxxx 1 xxx audio1 input is active audio1 input disabled audio2 control xx00xxxx xx01xxxx xx1xxxxx audio2 level = 0 db attenuation audio2 level = 20 db attenuation audio2 input disabled tv source mixer control ( note 2 ) 00 xxxxxx 01xxxxxx 1xxxxxxx tv source = 0 db attenuation (bypass attenuator/summing node) tv source level = 20 db attenuation tv source disabled note 1 audio1 exhibits excessive dc offset in the disabled state ( xxxx1xxx ). this dc offset can propagate to audio outputs lout, rout, tv_lout and tv_rout if care is not taken. there are two ways to avoid excessive dc offset at the audio outputs: 1. activate audio1 with register setting xxxx0xxx. the input pin can be either left floating or actively driven, or 2. bypass attenuator ?a? and the summing node with register code 00xxxxxx. by bypassing the summing node, the offset at audio1 will be blocked from the audio path. in this case, the state of audio1 control does not impact output dc offset. note 2 this effects both the tv audio outputs ( tv_lout, tv_rout, lout, rout) and the mod_mono audio output.
avpro ? 5002b dual scart a/v switch scart switching table input pins output pin aux_r: red input from aux port enc_r: red input from enc port enc_b: optional chroma input from enc port enc_c: chroma input from enc port tv_r: red video output to tv or svhs chroma output to tv port aux_g: green input from aux port enc_g: green input from enc port tv_g: green video output to tv port aux_b: blue input from aux scart enc_b: blue input from enc port tv_b: blue video output to tv port ablank: blanking input from aux port eblank: blanking input from enc port blank: tv blanking output for rgb (also can output 0v or 4v at this pin) aux_yc: composite input from aux port enc_yc: composite input from enc port enc_y: luma input from enc port enc_g: optional luma input from enc port tv_ycout: composite video, rgb sync, or luma output to tv port enc_yc: composite input from enc port mod_yc: composite output to rf modulator enc_c: chroma input from enc port enc_r: optional chroma input from enc port enc_b: optional chroma input from enc port aux_cout: chroma output to auxiliary port enc_yc: composite input from enc port enc_b: optional composite input from enc port enc_g: optional luma input from enc port enc_y: luma input from enc port aux_ycout: composite video output to auxiliary port aux_lin: left audio input from aux port lin: left audio input from audio dac audio1: external audio source audio2: external audio source lout: left audio output to rca jack aux_lin: left audio input from aux port lin: left audio input from audio dac audio1: external audio source audio2: external audio source tv_lout: left audio output to tv port lin: left audio input from audio dac aux_lout: left audio output to auxiliary port aux_rin: right audio input from aux port rin: right audio input from audio dac rout: right audio output to rca jack aux_rin: right audio input from aux port rin: right audio input from audio dac tv_rout: right audio output to tv port rin: right audio input from audio dac aux_rout: right audio output to auxiliary port rin: right audio input from audio dac lin: left audio input from audio dac audio1: external audio source audio2: external audio source mod_mono: mono audio output to rf modulator.
avpro ? 5002b dual scart a/v switch 13 pin descriptions (pins marked n/c should be left unconnected during normal use.) name type description analog pins ablank i auxiliary blanking input: in a typical system, this pin is connected to the rgb status pin (pin 16) from the auxiliary scart connector. aux_r i auxiliary red input: in a typical system, this pin is connected to the red input pin (pin 15) of the auxiliary scart connector. this input can be selected as the signal source for the tv_r output pin. aux_g i auxiliary green input: in a typical system, this pin is connected to the green input pin (pin 11) of the auxiliary scart connector. this input can be selected as the signal source for the tv_g output pin. aux_b i auxiliary blue input: in a typical system, this pin is connected to the blue input pin (pin 7) of the auxiliary scart connector. this input can be selected as the signal source for the tv_b output pin. aux_fnc i/o auxiliary function pin: this is a bi-directional pin. as an input, it digitizes the analog voltage on the auxiliary scart function pin. as an output, it puts out one of three voltage levels to the auxiliary scart function pin. aux_yc i auxiliary video input: in a typical system, this pin is connected to the composite video input pin (pin 20) of the auxiliary scart connector. this input can be selected as the signal source for the tv_ycout . aux_lin i auxiliary left audio input : in a typical system, this pin is connected to the l audio output pin (pin 3) of the auxiliary scart connector. this input can be selected as the signal source for the tv_lout . aux_rin i auxiliary right audio input : in a typical system, this pin is connected to the r audio output pin (pin 1) of the auxiliary scart connector. this input can be selected as the signal source for the tv_rout . eblank i encoder blanking input : in a typical system, this pin is connected to the blanking signal from the external video encoder device. enc_r i encoder red input: in a typical system, this pin is connected to the red output pin from the external video encoder device. this input can be selected as the signal source for the tv_r output pin. enc_g i encoder green input: in a typical system, this pin is connected to the green output pin from the external video encoder device. this input can be selected as the signal source for the tv_g output pin. enc_b i encoder blue input: in a typical system, this pin is connected to the blue output pin from the external video encoder device. this input can be selected as the signal source for the tv_b output pin.
avpro ? 5002b dual scart a/v switch pin descriptions (continued) name type description enc_yc i encoder video input: in a typical system, this pin is connected to the composite video output pin from the external video encoder device. this input can be selected as the signal source for the aux_ycout , tv_ycout and/or mod_yc pins. enc_y i encoder luma input: in a typical system, this pin is connected to the composite video output pin from the external video encoder device. in svhs mode, this input can be selected as the signal source for the tv_ycout pin and/or the aux_ycout pin. enc_c i encoder chroma input: in a typical system, this pin is connected to the tv_r output pin from the external video encoder device. in the svhs mode, this input can be selected as the signal source for the tv_r pin and/or the aux_cout output pin. lin i left audio input : in a typical system, this pin is connected to the left audio output pin of the external audio dac. this input can be selected as the signal source for the tv_lout and/or aux_lout pins. rin i right audio input : in a typical system, this pin is connected to the right audio output pin of the external audio dac. this input can be selected as the signal source for the tv_rout and/or aux_rout pins. audio 1 i external tone input: this pin accepts an external tone that can be output to the tv audio outputs. audio 2 i external tone input: this pin accepts an external tone that can be output to the tv audio outputs. aux_ycout o auxiliary video output : this pin is the composite video output to the auxiliary scart connector (pin 19). in the svhs mode, this pin is the luma output. aux_lout o auxiliary left audio output : this pin is the output to the left channel audio (pin 3) of the auxiliary scart connector. aux_rout o auxiliary right audio output : this pin is the output to the right channel audio (pin1) of the auxiliary scart connector. blank o blanking output : this output provides the blanking signal to the tv scart connector (pin 16). this signal is either the blanking signal from the auxiliary scart connector ( ablank ) or the external video encoder ( eblank ). lout o left audio output : this pin is the output to the left channel audio rca jack. rout o right audio output : this pin is the output to the right channel audio rca jack. mod_mono o mono audio output : this pin is sum of lin & rin audio inputs. it is typically used as the audio output to an external rf modulator.
avpro ? 5002b dual scart a/v switch 15 pin descriptions (continued) name type description aux_cout o aux chroma output: this output provides a chroma signal to the auxiliary scart connector to support svhs operation. this pin is typically ac coupled to pin 15 of the auxiliary scart connector. when the s-video mode is selected, a chroma signal from the video encoder is output to this pin. mod_yc o tv modulator video output: this pin provides composite video for an external rf modulator. the signal on this pin is provided by the enc_yc input pin. tv_ycout o tv video output: this pin is the composite video output to the tv scart connector (pin 19). in the svhs mode, this pin provides luminance information. tv_r o tv red output : this pin provides red video to the tv scart connector (pin 15). in svhs mode, this pin provides the chroma information. tv_g o tv green output : this pin provides green video to the tv scart connector (pin 11). tv_b o tv blue output : this pin provides blue video to the tv scart connector (pin 7). tv_lout o tv left audio output : this pin is the output to the left channel audio (pin 3) of the tv scart connector. tv_rout o tv right audio output : this pin is the output to the right channel audio (pin1) of the tv scart connector. tv_fnc i/o tv function pin: this is a bi-directional pin. as an input, it digitizes the analog voltage on the tv scart function pin. as an output, it puts out one of three voltage levels to the tv scart function pin. digital pins do_0 o digital output 0 : this pin is a general purpose output that is controlled by serial port register. do_1 o digital output 1 : this pin is a general purpose output that is controlled by serial port register. sclk i serial clock input : this pin accepts a serial port clock input signal. sdata i/o serial data input : this is a tri-state pin that receives or transmits serial data. power/ground pins vcc - +5 vdc power inputs. vee - -5 vdc power inputs. vdd - +12 vdc power input for function switching vref - internal voltage reference, bypass pin. add capacitor 0.01 f to ground. gnd - ground for all blocks. rbias - bias point of internal current generator. add resistor 10.0k to ground. tgen - reference point for internal timing circuit. add capacitor 470 pf to ground.
avpro ? 5002b dual scart a/v switch electrical specifications absolute maximum ratings operation beyond the maximum ratings may damage the device parameter rating storage temperature -55 to 150 c junction operating temperature +150 c positive supply voltages -0.3v < vcc < 6v; vcc ? 0.3v < vdd < 13v negative supply voltages -6 < vee < +0.3v voltage applied to digital inputs gnd-0.3v to vcc+0.3 v audio/video input pins vee-0.3v to vcc+0.3 v function input pins (300 w source ) gnd-0.3v to +15 v specifications : unless otherwise specified: 0 < ta < 70 c; power supplies vcc = +5.0 v 5%, vee = -5.0 v 5%, vdd = 12.0 v 5%. parameter condition min nom max unit operating characteristics power supply currents all outputs loaded vcc (+5 vdc) vee (-5 vdc) vdd (+12 vdc) -65 130 ?45 18 150 28 ma ma ma psrr f in = 100 hz, 0.3 vpp on vcc/ vee 40 db switch time from serial data acknowledge 2.0 m sec serial port timing (set by i 2 c controller) sclk input frequency 400 khz sclk low time ( t cl ) 1.3 m sec sclk high time ( t ch ) 0.6 m sec rise time ( t rt ) sclk and sdata 300 nsec fall time ( t ft ) sclk and sdata 300 nsec data set-up time* ( t dsu ) sdata change to sclk high 100 nsec data hold time* ( t dh ) sclk low to sdata change 0 nsec start set-up time ( t ssu ) 0.6 m sec start hold time ( t sh ) 0.6 m sec stop set-up time ( t psu ) 0.6 m sec glitch rejection maximum pulse on sclk and/or sdata 50 nsec * these specifications also apply to an acknowledge generated by the device.
avpro ? 5002b dual scart a/v switch 17 specifications (continued) digital i/o characteristics (sclk, sdata) parameter condition min nom max unit high level input voltage 0.7* vcc vcc+0.3 v low level input voltage gnd-0.3 0.3* vcc v high level input current vin = vcc - 1.0v -10 10 a low level input current vin = 1.0v -10 10 a low level output voltage (sdata) i ol = 3 ma 0.4 v fall time ( t ft )(sdata) acknowledge or read v ih min to v i l max with cl = 400 pf 250 nsec digital i/o characteristics (do_0, do_1, tv_fnc, aux_fnc) digital output sink current 4.5k pullup do_0, do_1, register bits read 0 1.0 ma digital output fall time r pullup = 10 k w , c l = 15 pf 100 nsec tv_fnc or aux_fnc output level 10 k or open load register 2 = xxxxxx00 register 2 = xxxxxx01 register 2 = xxxxxx10 or 11 0.0 4.9 10.0 1.0 6.0 10.5 1.2 6.5 vdd v v v tv- fnc or aux_fnc input levels read register= xxxxxx00 read register= xxxxxx01 read register= xxxxxx10 0.0 4.5 9.5 2.0 7.0 vdd v v v video characteristics - unless otherwise noted, typical output loading on all video outputs is 137 w . all video outputs are capable of withstanding a sustained 62ohm load to ground without damage. input impedance all video inputs 100 k w input dynamic range f in = 100 khz, thd < 1.0%, at dc floor level of 0.3 v 1.5 vpp gain 1.0 vpp input, f in = 100 khz 1.73 1.83 1.93 v/v rgb gain control a 0 = nominal xx00xxxx gain 1.0 vpp input, f in = 100 khz; register 2 = xx00xxxx register 2 = xx01xxxx register 2 = xx10xxxx register 2 = xx11xxxx 1.73 a 0 ?12% a 0 ?22% a 0 ?33% 1.83 a 0 ?10% a 0 ?20% a 0 ?30% 1.93 a 0 ?8% a 0 ?18% a 0 ?27% v/v v/v v/v v/v output gain inequality rgb or svhs output channel to channel -2.5 2.5 % video output dc level v blank level clamp voltage rgb, cvbs or luma outputs 1.2 v average level chroma outputs 1.9 v signal to noise ratio 1 vpp input 58 65 db cross talk f in = 4.43 mhz, 1 vpp -55 db output to output differential delay rgb signals, f in = 100 khz -20 20 nsec input or output, logical ?0? 0.0 0.4 v blanking level ( rapid switching ) input or output, logical ?1? 1.0 3.0 v blanking delay blank to rgb signals -50 50 nsec differential phase all composite outputs -2.5 2.5 deg. differential gain all composite outputs -5.0 5.0 %
avpro ? 5002b dual scart a/v switch audio characteristics - unless otherwise noted, all audio outputs shall drive a load of 10 k w . all audio outputs will withstand a sustained short to ground without damage. parameter condition min nom max unit input impedance 75 k w gain f in =1.0 khz, 0.5 vrms,0db attenuation 0.95 1.0 1.05 v/v 0.5 vrms input, flat within 0.3 db 20 khz frequency response measured -3 db point 100 khz signal to noise ratio a weighting f in = 1.0 khz, 2.0 vrms; register 4 = 00111011 90 db f in = 1.0 khz, 0.5 vrms; register 4 = 00111011 0.05 % distortion (thd) f in = 1.0 khz, 2 vrms; register 4 = 00111011 0.10 % output impedance 10 w output dc offset at aux_lout and aux_rout -40 30 mv output dc offset at mod_mono -75 30 mv tv source attenuator = 0 db ( bypassed ) with volume control -65 30 mv tv source attenuator = 0 db ( bypass ) bypass volume control -50 30 mv tv source attenuator = -20 db or disabled, audio1 active with volume control -90 30 mv output dc offset at lout, rout, tv_lout and tv_rout tv source attenuator = -20 db or disabled, audio1 active bypass volume control -75 30 mv output phase matching f in = 1.0 khz, 0.5 vrms; any stereo pair 0.5 deg. channel separation f in = 1.0 khz, 2.0 vrms, 0 db attenuation 90 db tv_lout/ tv_rout; lout/rout register 0 = x0000000; register 4 = 00111000 0 db register 0 = x0011111; register 4 = 00111000 -31 db output attenuation (volume control) register 0 = x1xxxxxx (mute) ; register 4 = 00111000 -60 db attenuation accuracy -5 5 % audio to video path skew video input = 1.0 vpp @ 100 khz audio input = 1.0 khz, 0.5 vrms 1.5 m sec
avpro ? 5002b dual scart a/v switch 19 equivalent circuits: video output circuit auxiliary scart pin 15 circuit audio output circuit r l = 75 w on impedance 11 w 62 w esd protection + - aux_cout 62 w aux_r scart pin 15 impedance 11 w esd protection + - scart connector 300 w r l 3 10k w esd protection
avpro ? 5002b dual scart a/v switch digital output circuit aux and tv function switching circuit audio input circuit scart connector r l 3 10k w esd protection 12v 50 w r sw = 70 w 44k w 22k w r l 3 10k w esd protection scart connector 30k w vcc
avpro ? 5002b dual scart a/v switch 21 video input (typical) serial port timing (typical) sclk t ft t ch t cl t psu t dsu t dh t sh t ssu t rt sdata start stop hi-z r l = 75 w video mux dc restore esd protection scart connector
avpro ? 5002b dual scart a/v switch package pin designations (top view) avpro ? 5002b-cgt (64 lqfp) enc_y enc_b enc_g enc_r enc_yc enc_c rin lin vee sdata sclk do_0 do_1 vdd tv_fnc aux_fnc tv_r tgen n/c mod_yc tv_ycout blank gnd vcc gnd tv_b aux_ycout n/c aux_cout n/c vcc tv_g aux_b audio1 aux_lin n/c rbias vref audio2 aux_rin n/c eblank ablank n/c aux_yc n/c aux_g aux_r 1 9 17 25 33 41 49 57 mod_mono vcc n/c aux_rout tv_rout rout gnd vee gnd tv_lout aux_lout n/c vcc vee n/c lout avpro 5002b- 64cgt
avpro ? 5002b dual scart a/v switch 23 mechanical drawing 64-lead low profile plastic quad flatpack package(jedec lqfp) note: controlling dimensions are in mm. ordering information part description order no. package mark avpro ? 5002b dual scart a/v switch 5002bxxa64cgt avpro ? 5002b-cgt no responsibility is assumed by tdk semiconductor corporation for use of this product nor for any infringements of patents and trademarks or other rights of third parties resulting from its use. no license is granted under any patents, patent rights or trademarks of tdk semiconductor corporation and the company reserves the right to make changes in specifications at any time without notice. accordingly, the reader is cautioned to verify that you are referencing the most current data sheet before placing orders. to do so, see our web site at http://www.tsc.tdk.com or contact your local tdk semiconductor representative. purchase of i 2 c components of tdk corporation or one of its sublicensed associated companies conveys a license under the philips i 2 c patent rights to use these components in an i 2 c system, provided that the system conforms to the i 2 c standard specification as defined by philips. tdk semiconductor corp., 2642 michelle dr., tustin, ca 92780, (714) 508-8800, fax (714) 508-8877, http://www.tdksemiconductor.com 1999-2000 tdk semiconductor corporation 8/07/00 rev. d

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