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d a t a sh eet product speci?cation supersedes data of 1995 mar 21 file under integrated circuits, ic02 1998 jun 23 integrated circuits TDA8722 i 2 c-bus programmable modulator for negative video modulation and fm sound
1998 jun 23 2 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 features video amplifier with clamp and white clip circuits fm sound modulator asymmetrical and symmetrical rf outputs available symmetrical rf oscillator using only a few external components external adjusting of modulation depth and level of the sound subcarrier i 2 c-bus receiver for frequency setting and test-mode selection one i 2 c programmable output port on-chip phase-locked loop (pll) frequency synthesizer on-chip power supply regulator bus switchable oscillator on-chip test pattern signal generator (tpsg). applications video recorders cable converters satellite receivers. general description the TDA8722 is a programmable modulator which generates an rf tv channel from a baseband video signal and a baseband audio signal in the event of negative video and fm sound standards (pal b/g, i, d/k and ntsc). it is especially suited for satellite receivers, video recorders and cable converters. the video carrier frequency is set exactly to the correct channel frequency by a pll synthesizer which is programmed in accordance with the i 2 c-bus format. ordering information type number package name description version TDA8722t so20 plastic small outline package; 20 leads; body width 7.5 mm sot163-1 TDA8722m ssop20 plastic shrink small outline package; 20 leads; body width 4.4 mm sot266-1
1998 jun 23 3 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 quick reference data v dda =v ddd =5v; t amb =25 c after the ic has reached thermal equilibrium; unless otherwise speci?ed. notes 1. value depends on value of resistor r17 (see fig.7). 2. value depends on value of capacitor c17 (see fig.7). symbol parameter conditions min. typ. max. unit v dda analog supply voltage 4.5 5.0 5.5 v v ddd digital supply voltage 4.5 5.0 5.5 v i dd total supply current normal mode 41 52 63 ma d m typical modulation depth range video level (pin 19) = 0.5 v (p-p); note 1; see fig.10 65 - 90 % d p/s typical picture-to-sound level range note 2; see fig.11 - 18 -- 10 db v rf rf output voltage level asymmetrical on a 75 w load frequency between 471.25 and 855.25 mhz 77 80 83 db m v d f fm deviation on audio subcarrier f i = 400 hz; v 1 = 0.5 v (rms); before pre-emphasis ?lter 20 25 30 khz
1998 jun 23 4 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 block diagram fig.1 block diagram. handbook, full pagewidth mbe401 logic enable/ select f div f ref 14 10 bits i c-bus 2 receiver 12-bit divider (n) phase detector enable charge pump amp 7 divider (m = 128) 31.25 khz 4 mhz oscillator 9 xtal 11 v ddd dgnd 10 8 amp cp prescaler (8) asymmetrical output buffer uhf oscillator TDA8722 4 5 6 uoscb ognd uosca rf oscillator on pc audio fm modulator 12 13 sda scl p0 soscb sosca audio 3 2 1 switch tpsg balance test tpsg on mixer 16 15 voltage regulator 18 20 17 adjust agnd v dda rfa rfb clip clamp 19 video video amp
1998 jun 23 5 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 pinning symbol pin description audio 1 audio input sosca 2 sound oscillator a soscb 3 sound oscillator b uoscb 4 uhf oscillator b ognd 5 rf oscillator ground uosca 6 uhf oscillator a amp 7 tuning ampli?er output cp 8 charge pump output xtal 9 crystal oscillator dgnd 10 digital ground v ddd 11 digital supply voltage scl 12 serial clock input (i 2 c-bus) sda 13 serial data input (i 2 c-bus) p0 14 npn open-collector output port rfb 15 asymmetrical rf output b rfa 16 asymmetrical rf output a adjust 17 modulation depth and picture-to-sound distance adjustment pin agnd 18 analog ground video 19 video input v dda 20 analog supply voltage fig.2 pin configuration. handbook, halfpage TDA8722 mbe394 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 cp dgnd xtal scl sda amp p0 uosca rfb ognd rfa uoscb adjust soscb agnd sosca video audio v ddd v dda functional description the TDA8722 is a programmable modulator which can be divided into two main blocks: a modulator for negative video modulation and fm sound tv standards a programmable pll frequency synthesizer. the video part of the modulator consists of a clamping circuit which sets the internal reference voltage to the bottom of the synchronizing pulse, followed by a white clip which avoids over modulation in case the video signal is too strong. typically, the ic starts to clip the video signal when the voltage at the video input (pin 19) is >560 mv (p-p) while the normal voltage at the video input is 500 mv (p-p). this clipping function ensures that the video modulation depth is not too high. the modulation depth is adjusted in the application between at least 65 and 90% by changing the resistor value between pin 17 and ground (r17). the value can change between 47 k w and infinite (r17 removed); see fig.10. the video part also contains a test pattern signal generator to simplify the adjustment of the receiving channel of the tv set to the required channel of the modulator. the pattern consists of a synchronization pulse and two vertical white bars on screen (see fig.3). the audio part of the modulator contains an fm sound modulator. the frequency of the sound subcarrier is set in the application by external components (c3, l3 and r3). the difference between the video carrier level and the sound subcarrier level is adjusted in the application by changing the value of the capacitor between pin 17 and ground (c17). the value can change between 0 and 47 pf. the distance between the video carrier and the sound subcarrier can be adjusted between at least - 10 and - 18 db (see fig.11).
1998 jun 23 6 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 to bias the audio input it is necessary to put a resistor in the application between pin 1 and ground. the resistor has a typical value of 12 k w . the rf part of the oscillator consists of: an oscillator which operates at the required video carrier frequency. the range of the oscillator is determined in the application by c5, c6, l5 and d5. an rf mixer. it first combines the video signal and the sound subcarrier to build a baseband tv channel. then the baseband signal is mixed with the oscillator signal to get the rf tv channel. the mixer has two outputs which can be used as two independent asymmetrical outputs, or as one symmetrical output. in the event of asymmetrical use, the unused output must be loaded with a 75 w resistor (see fig.7). the oscillator frequency is set by a programmable pll frequency synthesizer in accordance with equation: f osc =8 n f ref where: f osc is the local oscillator frequency. n is a 12-bit dividing number (10 bits are programmable by the i 2 c-bus). f ref is the crystal frequency (4 mhz) divided by 128 (31.25 khz). the circuit allows a step of 250 khz but because only 10 bits are programmable, the programming steps are 1 mhz. when the pll loop is locked, both inputs of the phase comparator are equal, which gives equation: during the test mode operation, f div and f ref can be monitored on the output port pin (pin 14). software information the synthesizer is controlled via a two-wire i 2 c-bus receiver. for programming, the address byte (c8 hex) has to be sent first. then one or two data bytes are used to set the 10 programmable bits of the dividing number n, the test bits (see table 1) and the output port state. note that after power-up of the ic, the two data bytes must be sent. f div f osc 8n ------------- f xtal 128 --------- - f ref === fig.3 test pattern signal. handbook, full pagewidth 0102030 40 50 60 64 70 mbe395 t ( m s)
1998 jun 23 7 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 table 1 data format; notes 1 and 2 notes 1. the 10 programmable bits of n are: b2 to b11. 2. internal hardware sets: b1 = 0 and b0 = 1. 3. t0, t1 and t2 are bits used for test purposes (see table 5). 4. p0 is a bit used for controlling the state of the output port (see table 6). table 2 structure of the dividing number n notes 1. bits b2 to b11 are programmable and represent the integer part of the frequency in mhz. bits b1 and b0 are fixed internally to b1 = 0 and b0 = 1 to get the added 0.25 mhz, common for most tv channels. 2. bits b1 and b0 are not programmable. 3. f osc = 512b11 + 256b10 + 128b9 + 64b8 + 32b7 + 16b6 + 8b5 + 4b4 + 2b3 + b2 + 0.25 (mhz). table 3 dividing number n for programming channel 21 (471.25 mhz) notes 1. bits b1 and b0 are not programmable. 2. f osc =0+256+128+64+0+16+0+4+2+1+ 0.25 (mhz) = 471.25 mhz. table 4 content of the data bytes to program channel 21 (471.25 mhz) it is possible to change only one data byte. the circuit will recognize which one is received with the value of msb (0 for data byte 1 and 1 for data byte 2). it is possible to change the frequency by 1 mhz with data byte 2. it is easy to increment the channel frequency when its frequency width is 8 mhz by simply incrementing data byte 1. byte bit 7 msb bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 lsb acknowledge bit address byte c8 1 1 0 0 1 0 0 0 ack data byte 1 0 b11 b10 b9 b8 b7 b6 b5 ack data byte 2 1 t0 (3) t1 (3) t2 (3) p0 (4) b4 b3 b2 ack result bits (1) b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 (2) b0 (2) frequency (mhz) (3) 51225612864321684210.5 0.25 result bits b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 (1) b0 (1) value 011101011101 frequency (mhz) (2) 02561286401604210 0.25 byte bit 7 msb bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 lsb acknowledge bit address byte c8 1 1 0 0 1 0 0 0 ack data byte 1 0 0 1 1 1 0 1 0 ack data byte 2 1 0 0 0 0 1 1 1 ack
1998 jun 23 8 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 the bits t0 to t2 are available for test purposes and the possibilities are shown in table 5. table 5 test modes notes 1. in tpsg on mode the video carrier is modulated by the test signal consisting of a synchronization pulse and two vertical white bars on a black screen. this mode should be selected to adjust the tv set receiving the modulated signal to the right frequency. 2. in rf oscillator off mode, the rf oscillator and the rf mixer are switched-off and there is no rf carrier coming out of the device. this mode can be selected to avoid rf radiation to other parts when the modulator output is not used. 3. in balance test, the video carrier is over modulated. this simplifies residual carrier measurements. 4. in f ref and f div modes, the reference frequency f ref in the phase comparator or the divided rf oscillator frequency f div is available on the output port pin. this mode requires that bit p0 = 0. 5. the high-impedance test mode may be used to inject an external tuning voltage to the rf tank circuit, to test the oscillator. in this mode, the phase detector is disabled and the external transistor of the tuning amplifier is switched-off. the amp output (pin 7) is low (<200 mv). 6. in the phase detector disabled mode, it is possible to measure the leakage current at the input of the tuning amplifier, on the cp pin. in this mode the rf oscillator is off, and the baseband tv channel signal is present on the rf outputs for testing the audio and video parts. t0 t1 t2 operational mode 0 0 0 normal operation 0 0 1 test pattern signal generator (tpsg) on; note 1 0 1 0 rf oscillator off; note 2 0 1 1 balance test; note 3 100f ref out (if p0 = 0); note 4 1 0 1 high-impedance test; note 5 110f div out (if p0 = 0); note 4 1 1 1 phase detector disabled; baseband signals on rf outputs; note 6 the possibilities of bit p0, which controls the output port (pin 14) are given in table 6. the port is an npn open-collector type. for monitoring the f ref or f div frequency on the output port, the p0 bit must be logic 0 to let the output port free. table 6 output port programming p0 output port state 0 off; high impedance 1 on; sinking current
1998 jun 23 9 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 limiting values in accordance with the absolute maximum rating system (iec 134). handling inputs and outputs are protected against electrostatic discharge in normal handling. however, to be completely safe, it is desirable to take normal precautions appropriate to handling integrated circuits. every pin withstands the esd test in accordance with mil-std-883c category b (2000 v). every pin withstands the esd test in accordance with philips semiconductors machine model (mm) 0 w , 200 pf (200 v). thermal resistance symbol parameter min. max. unit v dda analog supply voltage - 0.3 +6 v v ddd digital supply voltage - 0.3 +6 v v dd operating supply voltage 4.5 5.5 v v max maximum voltage on all pins - 0.3 v dd v t stg ic storage temperature - 40 +125 c t amb operating ambient temperature - 20 +85 c symbol parameter value unit r th j-a thermal resistance from junction to ambient in free air so20; sot163-1 85 k/w ssop20; sot266-1 120 k/w
1998 jun 23 10 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 characteristics v dda =v ddd =5v; t amb =25 c; valid over the whole uhf band; measured in circuit of fig.7; unless otherwise speci?ed. symbol parameter conditions min. typ. max. unit supply i dd supply current normal mode 41 52 63 ma rf off test mode 30 38 46 ma video characteristics i 19 input current (ac) v 19 = 3.2 v - 0.5 2.0 m a z 19 video input impedance v 19 = 3.2 v 30 -- k w m modulation depth v 19 = 500 mv (p-p) ebu colour bars; r17 = 120 k w ; see fig.7 77 82 87 % during clipping condition; note 1 85 - 98 % tpsg mode; r17 = 120 k w 72 82 92 % balance test mode; r17 = 120 k w 110 -- % d m modulation depth range v 19 = 500 mv (p-p) ebu colour bars; 47 k w r17 ? 65 - 90 % d m apl variation of modulation depth with change of apl between 10 and 90% referenced to the value for apl = 50%; v 19 = 500 mv (p-p) - 2 - +2 % v clip(p-p) video input level where clipping starts (peak-to-peak value) video level on pin 19; note 2 - 0.56 - v s/n video video signal-to-noise ratio f rf < 700 mhz; note 3 48 52 - db f rf > 700 mhz; note 3 46 50 - db g diff differential gain note 4 - 8 - +8 % f diff differential phase note 4 - 8 - +8 deg v/s video-to-sync ratio v 19 = 500 mv (p-p); v/s = 7/3 6.9/3.1 7/3 7.1/2.9 f video frequency response for the video signal note 5 - 1 - +1 db audio characteristics (for pal g standard; audio subcarrier at 5.5 mhz) z 1 audio input impedance 30 -- k w d m modulation deviation f 1 = 400 hz; v 1 = 0.5 v (rms) before pre-emphasis ?lter 20 25 30 khz d m max maximum modulation deviation f 1 = 400 hz; v 1 = 2.0 v (rms) before pre-emphasis ?lter 60 85 - khz thd total harmonic distortion f 1 = 1 khz; v 1 = 0.5 v (rms) before pre-emphasis ?lter - 0.4 1.5 %
1998 jun 23 11 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 s/n audio audio signal-to-noise ratio note 6 45 50 - db f audio frequency response of the audio signal note 7 - 1 - +1 db p/s picture-to-sound ratio no audio signal; fm = 5.5 mhz; c17=15pf - 16 - 13 - 10 db d p/s picture-to-sound ratio range no audio signal; fm = 5.5 mhz; 0pf c17 39 pf - 18 -- 10 db channel characteristics f rf rf frequency range using tank circuit of fig.7 471.25 - 855.25 mhz v rf output level on rfa and rfb asymmetrical output loaded with 75 w ; f = 471.25 to 855.25 mhz 77 80 83 db m v d v rf difference between the level of modulated carrier and the level of the unmodulated carrier measurement is made during synchronization pulse for the modulated carrier 012db spo spurious outside channel note 8 -- 62 - dbc rf sh rf second harmonic level on asymmetrical output f rf = 471.25 mhz -- 30 - 25 dbc f rf = 855.25 mhz -- 20 - 15 dbc sc sh sound carrier second harmonic level f s = 5.5 mhz; c17 = 15 pf; f rf < 700 mhz -- 65 - 60 dbc f s = 5.5 mhz; c17 = 15 pf; f rf > 700 mhz -- 63 - 58 dbc sc th sound carrier third harmonic level f s = 5.5 mhz; c17 = 15 pf -- 65 - 60 dbc video signal harmonics note 9 -- 60 - 55 dbc f ref reference frequency spurious f p + 31.25 khz -- 65 - 60 dbc im chrominance beat note 10 -- 65 - 60 dbc charge pump output (cp) i 8 output current - 100 -m a v 7 output voltage in lock 1.5 - 2.5 v i oz off-state leakage current v cp = 2 v; t0 = 1; t1 = 1; t2 = 1 -- 10 na ampli?er output (amp) g ampli?er current gain v cp =2v; i amp =10 m a - 4000 - v 7sat output saturation voltage v cp = 0 v; t0 = 1; t1 = 0; t2 = 1 - 140 200 mv crystal oscillator characteristics (xtal) z 9 oscillator input impedance --- 500 w symbol parameter conditions min. typ. max. unit
1998 jun 23 12 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 notes 1. modulation depth when the video signal is between 560 and 1000 mv (peak-to-peak value) at pin 19. r17 = 120 k w in the application. 2. for application information only. 3. ratio between the ccir 17 line bar amplitude (corresponding to the level difference between black and white; see fig.4 and the rms value of the noise on a black line (line 22 or 335) measured on the video signal after demodulation for pal g standard. measurement is unweighted, done between 200 khz and 5 mhz. 4. measured for pal g standard on 4 first steps of ccir 330 line, corresponding to a 5 step staircase with 300 mv (peak-to-peak value) chrominance carrier when the level between synchronization pulse and white is 1 v; see fig.5. 5. measured with a spectrum analyzer with peak hold function, applying a 500 mv (peak-to-peak value) sine wave at the video input of the ic, with a frequency of 0.5, 2.0, 4.0 and 4.8 mhz. the reference is the value measured for 1.0 mhz. 6. measured using ccir 468-3 weighting filter and quasi-peak detection, with an audio frequency of 1 khz and a deviation of 50 khz. video signal is ebu colour bars of 500 mv (peak-to-peak value) on pin 19. 7. measured in pal g standard with no pre-emphasis on the audio input and no de-emphasis in the receiver. audio input level is adjusted for having a deviation of 25 khz at 1 khz audio frequency. measurement is done for frequencies between 50 hz and 15 khz, reference is the level measured for 1 khz. 8. except for the harmonics of the rf oscillator frequency and for the combinations between the rf oscillator frequency and the sound oscillator frequency (f rf +2f s , 2f rf +f s , etc.). this measurement includes the spurious at the 1 4 f rf , 1 2 f rf and 3 4 f rf . 9. corresponding to the harmonics of the video signal. measured by putting a 1 mhz sine wave of 500 mv (peak-to-peak value) at the video input (pin 19) and checking the level at f rf + 2 mhz, f rf + 3 mhz, etc. 10. measured with a 4.43 mhz sine wave of 350 mv (peak-to-peak value) at the video input. measurement is the difference between the level of the unmodulated picture carrier and the level of the spike appearing at the frequency of the picture carrier plus 1.07 mhz. c17 = 15 pf in the application diagram of fig.7. output port characteristics (p0) v ol low level output voltage p0 = 1; i 14 =5ma - 150 400 mv i oz off-state leakage current p0 = 0; v dd = 5.5 v -- 10 m a i 14(max) maximum port current p0 = 1 -- 10 ma i 2 c-bus receiver characteristics (sda and scl) v ih high level input voltage 3 - 5.5 v v il low level input voltage 0 - 1.5 v i ih high level input current v ih =5v; v dd =0or5v -- 10 m a i il low level input current v il =0v; v dd =0or5v - 10 --m a v o output voltage on sda during acknowledge pulse; i il =3ma -- 0.4 v symbol parameter conditions min. typ. max. unit
1998 jun 23 13 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 fig.4 ccir insertion line n.17. handbook, full pagewidth 0102030 40 50 60 64 70 mbe396 t ( m s) 1 v 0.3 v 0 v fig.5 ccir insertion line n.330. handbook, full pagewidth 0102030 40 50 60 64 70 mbe397 t ( m s) 1 v 0.3 v 0 v
1998 jun 23 14 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 internal pin configuration fig.6 pin equivalent circuit for each pin. esd protection components are not shown in the diagram. handbook, full pagewidth voltage regulator audio sosca soscb uoscb ognd uosca xtal dgnd v video agnd adjust rfa rfb p0 sda scl v ddd dda 1 2 3 4 5 6 amp cp 7 8 9 10 20 18 19 17 16 15 14 13 12 11 mbe402
1998 jun 23 15 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 application information fig.7 reference measuring set-up. (1) k1: switches the pre-emphasis filter on or off. (2) l5: air coil; 1.5 turns; diameter of 2 mm. (3) l3: to adjust the application to the right sound carrier frequency (5.5 mhz for pal g). (4) k2: switches the fm sound oscillator on or off. handbook, full pagewidth 220 pf 220 k w 15 k w 220 w c1 c30 c31 10 nf 2.2 m f c21 2.2 m f audio r4 12 k w r18 82 w r19 470 w r17 120 k w r20 470 w rf 75 w 1 k w r14 r2 22 k w 75 w 12 k w r5 22 k w r6 12 k w r7 22 k w r9 c3 c5 c6 c8 56 pf r1 r3 l3 15 m h k2 bb215 d5 33 pf 33 pf 150 nf l5 k1 10 nf c7 t8 bc547b r8 10 nf c11 q9 c9 4 mhz 27 pf 33 v 5 v gnd port scl sda c20 100 nf 20 18 19 17 16 15 14 13 12 11 12 3 4 56 78 910 (3) (1) (2) (4) video 100 nf c19 r15 15 pf c17 100 pf c16 100 pf c15 TDA8722 mbe403
1998 jun 23 16 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 application design fig.8 application using an asymmetrical output. (1) rv1 allows fine adjustment of the modulation depth between 70 and 90%. handbook, full pagewidth 220 pf 220 k w c1 c30 10 nf audio 12 k w r18 82 w r19 470 w r20 470 w rf 75 w r2 22 k w 15 k w 75 w 12 k w r5 22 k w r6 12 k w r7 22 k w r9 c3 c5 c6 c8 56 pf r1 r3 l3 15 m h bb215 d5 33 pf 33 pf 150 nf l5 10 nf c7 t8 bc547b r8 10 nf c11 q9 c9 4 mhz 27 pf 33 v gnd port scl sda 5 v c20 100 nf (1) video 100 nf c19 r15 100 pf c16 100 pf c15 mbe405 15 pf c17 82 k w r17 100 k w 20 18 19 17 16 15 14 13 12 11 12 3 4 56 78 910 TDA8722 rv1
1998 jun 23 17 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 fig.9 application using a symmetrical output with a balun transformer. handbook, full pagewidth 220 pf 220 k w c1 c30 10 nf audio 12 k w r18 82 w r19 470 w r17 120 k w r15 300 w r20 470 w rf 75 w r2 22 k w 15 k w 12 k w r5 22 k w r6 12 k w r7 22 k w r9 c3 c5 c6 c8 56 pf r1 r3 15 m h bb215 d5 33 pf 33 pf 150 nf l5 10 nf c7 t8 bc547b r8 10 nf c11 q9 c9 4 mhz 27 pf 33 v gnd port scl sda 5 v c20 100 nf video 100 nf c19 15 pf c17 100 pf c16 100 pf c15 mbe404 tr1 1 64 23 toko - b4f 617db - 1010 l3 20 18 19 17 16 15 14 13 12 11 12 3 4 56 78 910 TDA8722 in the design of the application, it is highly recommended to separate the part of the rf oscillator as much as possible from the part of the rf outputs in order to avoid parasitic coupling between these two parts. a good solution is shielding the rf oscillator part to avoid radiation from and to this part. the pin 5 (ognd) must be connected to the shielding box and to ground. rf outputs for inexpensive applications, it is possible to use the ic with an asymmetrical output (pins 15 or 16). in this event, the unused output pin must be loaded with a load as similar as possible to the load connected to the used pin, see fig.8. a good improvement in performance is obtained using a 1 : 4 symmetrical to asymmetrical transformer (balun; balance-to-unbalance) connected between the two outputs. in this event both outputs have their loads matched. the level of the rf second harmonic, and the spurious outside channel is decreasing. the parasitic coupling between rf outputs and rf oscillator is also reduced (see fig.9).
1998 jun 23 18 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 modulation depth with 500 mv (peak-to-peak value) video input signal, the wanted modulation depth must be set by the value of r17 (resistor between pin 17 and ground) as shown fig.10. for a good accuracy, it is recommended to use a 1% type resistor. it is also possible to use an adjustable resistor, see fig.8. depending on the layout of the pcb, it may be necessary to slightly change the value of r17 from the one given in fig.10 to get the wanted modulation depth. sound oscillator design the frequency of the sound subcarrier is fixed by the tank circuit connected between pins 2 and 3. this frequency can be adjusted between 4.5 and 6.5 mhz covering all existing standards in the world. the damping resistor r3 between pins 2 and 3 is necessary to decrease the quality factor of the tank circuit allowing the frequency to be modulated by the audio signal. the value of this resistor is calculated for several q factor ranges of the coil for a sound frequency of 5.5 mhz (see table 7). fig.10 typical modulation depth as a function of the value of r17. handbook, halfpage 100 80 70 60 10 3 mbe398 10 2 10 90 r17 (k w ) modulation depth (%) table 7 value of resistor for several q factor ranges the use of a coil with a quality factor <30 may result in a non operating oscillator. for safety, it is recommended to use a coil with a quality factor 3 50. picture-to-sound ratio the picture-to-sound ratio can be adjusted in the application by changing the value of c17 (capacitor between pin 17 and ground); see fig.11. figure 11 shows us that the picture-to-sound ratio will change for a constant value of c17 when the sound subcarrier frequency will change. rf harmonics this ic has been designed to have the lowest level of unwanted rf harmonics at the frequencies where these are the hardest to be filtered out, especially for the second harmonic of the rf carrier at the lowest frequencies of the uhf band. the level of the second and third rf harmonic is shown in fig.12 for an asymmetrical application. this chart gives a typical value while the level of these harmonics can vary depending on the design of the application. it is possible to reduce the level of the second harmonic by using a wide band transformer at the output of the ic and create a symmetrical application (see fig.9). to reduce the out-of-band harmonics and especially the third one, it is necessary to use a low-pass filter at the output of the ic. coil quality factor proposed value for r3 (k w ) 30 to 40 82 to 33 40 to 50 33 to 27 50 to 60 27 to 22 60 to 80 22 to 18 80 to >100 18 to 15
1998 jun 23 19 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 fig.11 typical picture-to-sound ratio as a function of the value of c17. r17 = 120 k w . (1) 4.5 mhz. (2) 5.5 mhz. (3) 6.0 mhz. (4) 6.5 mhz. handbook, halfpage 01020 40 8 20 16 12 mbe399 30 c17 (pf) p/s (db) (1) (4) (3) (2) fig.12 typical level of rf harmonics for an asymmetrical application. handbook, halfpage 450 550 14 18 26 30 22 mbe400 650 750 850 rf (mhz) rf harmonics (dbc) third harmonic second harmonic vhf operation this ic can operate on frequencies as low as 200 mhz (and especially for vhf 3 band) provided the impedance of the tuned circuit between pins 4 and 6 is >1 k w . nicam and stereo because of the fact that the adjust pin (pin 17) is an access point to the rf mixer, it is possible to use this pin to inject an external modulated subcarrier into the ic. this is especially interesting when it is necessary to transmit a second frequency modulated audio subcarrier for stereo sound (f = 5.72 mhz) or a nicam qpsk modulated carrier for digital audio transmission (f = 5.85 or 6.552 mhz). the incoming signal must be externally modulated either in fm with the desired signal corresponding to pal b/g specification for stereo sound transmission, or in qpsk in accordance with the nicam transmission system. the input impedance on pin 17 is approximately 3500 w , the incoming signal must be capacitive coupled, the resistor r17 between pin 17 and ground must remain to adjust the modulation depth, the capacitor c17 between pin 17 and ground may be changed depending on the capacitance brought on by the incoming network. if this capacitance is large, it is possible to remove c17. figure 13 shows a possible application for injecting such kind of signal into the modulator ic. following this application, to get a picture-to-second sound carrier ratio of - 20 db, it is necessary to apply a level of approximately 800 mv (peak-to-peak value) at the second carrier input, when the picture-to-first sound carrier ratio is approximately - 13 db. in addition, the internal fm sound modulator can be switched off by short-circuiting pins 2 and 3.
1998 jun 23 20 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 handbook, full pagewidth r18 82 w r19 470 w r17 120 k w r21 10 k w r15 75 w r20 470 w rf 75 w port 100 nf c20 video second carrier 100 nf c19 10 pf c21 c17 100 pf c16 100 pf c15 mgc419 20 18 19 17 16 15 14 TDA8722 fig.13 possible application for a second sound subcarrier.
1998 jun 23 21 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 package outlines unit a max. a 1 a 2 a 3 b p cd (1) e (1) (1) eh e ll p q z y w v q references outline version european projection issue date iec jedec eiaj mm inches 2.65 0.30 0.10 2.45 2.25 0.49 0.36 0.32 0.23 13.0 12.6 7.6 7.4 1.27 10.65 10.00 1.1 1.0 0.9 0.4 8 0 o o 0.25 0.1 dimensions (inch dimensions are derived from the original mm dimensions) note 1. plastic or metal protrusions of 0.15 mm maximum per side are not included. 1.1 0.4 sot163-1 10 20 w m b p detail x z e 11 1 d y 0.25 075e04 ms-013ac pin 1 index 0.10 0.012 0.004 0.096 0.089 0.019 0.014 0.013 0.009 0.51 0.49 0.30 0.29 0.050 1.4 0.055 0.419 0.394 0.043 0.039 0.035 0.016 0.01 0.25 0.01 0.004 0.043 0.016 0.01 0 5 10 mm scale x q a a 1 a 2 h e l p q e c l v m a (a ) 3 a so20: plastic small outline package; 20 leads; body width 7.5 mm sot163-1 95-01-24 97-05-22
1998 jun 23 22 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 unit a 1 a 2 a 3 b p cd (1) e (1) (1) eh e ll p qz y w v q references outline version european projection issue date iec jedec eiaj mm 0.15 0 1.4 1.2 0.32 0.20 0.20 0.13 6.6 6.4 4.5 4.3 0.65 1.0 0.2 6.6 6.2 0.65 0.45 0.48 0.18 10 0 o o 0.13 0.1 dimensions (mm are the original dimensions) note 1. plastic or metal protrusions of 0.20 mm maximum per side are not included. 0.75 0.45 sot266-1 90-04-05 95-02-25 w m q a a 1 a 2 b p d h e l p q detail x e z e c l v m a x (a ) 3 a y 0.25 110 20 11 pin 1 index 0 2.5 5 mm scale ssop20: plastic shrink small outline package; 20 leads; body width 4.4 mm sot266-1 a max. 1.5
1998 jun 23 23 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 soldering introduction there is no soldering method that is ideal for all ic packages. wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. however, wave soldering is not always suitable for surface mounted ics, or for printed-circuits with high population densities. in these situations reflow soldering is often used. this text gives a very brief insight to a complex technology. a more in-depth account of soldering ics can be found in our ic package databook (order code 9398 652 90011). re?ow soldering reflow soldering techniques are suitable for all so and ssop packages. reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. several techniques exist for reflowing; for example, thermal conduction by heated belt. dwell times vary between 50 and 300 seconds depending on heating method. typical reflow temperatures range from 215 to 250 c. preheating is necessary to dry the paste and evaporate the binding agent. preheating duration: 45 minutes at 45 c. wave soldering so wave soldering techniques can be used for all so packages if the following conditions are observed: a double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. the longitudinal axis of the package footprint must be parallel to the solder flow. the package footprint must incorporate solder thieves at the downstream end. ssop wave soldering is not recommended for ssop packages. this is because of the likelihood of solder bridging due to closely-spaced leads and the possibility of incomplete solder penetration in multi-lead devices. if wave soldering cannot be avoided, the following conditions must be observed: a double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. the longitudinal axis of the package footprint must be parallel to the solder flow and must incorporate solder thieves at the downstream end. even with these conditions, only consider wave soldering ssop packages that have a body width of 4.4 mm, that is ssop16 (sot369-1) or ssop20 (sot266-1) . m ethod (so and ssop) during placement and before soldering, the package must be fixed with a droplet of adhesive. the adhesive can be applied by screen printing, pin transfer or syringe dispensing. the package can be soldered after the adhesive is cured. maximum permissible solder temperature is 260 c, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 c within 6 seconds. typical dwell time is 4 seconds at 250 c. a mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. repairing soldered joints fix the component by first soldering two diagonally- opposite end leads. use only a low voltage soldering iron (less than 24 v) applied to the flat part of the lead. contact time must be limited to 10 seconds at up to 300 c. when using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 c.
1998 jun 23 24 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 definitions life support applications these products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify philips for any damages resulting from such improper use or sale. purchase of philips i 2 c components data sheet status objective speci?cation this data sheet contains target or goal speci?cations for product development. preliminary speci?cation this data sheet contains preliminary data; supplementary data may be published later. product speci?cation this data sheet contains ?nal product speci?cations. limiting values limiting values given are in accordance with the absolute maximum rating system (iec 134). stress above one or more of the limiting values may cause permanent damage to the device. these are stress ratings only and operation of the device at these or at any other conditions above those given in the characteristics sections of the speci?cation is not implied. exposure to limiting values for extended periods may affect device reliability. application information where application information is given, it is advisory and does not form part of the speci?cation. purchase of philips i 2 c components conveys a license under the philips i 2 c patent to use the components in the i 2 c system provided the system conforms to the i 2 c specification defined by philips. this specification can be ordered using the code 9398 393 40011.
1998 jun 23 25 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 notes
1998 jun 23 26 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 notes
1998 jun 23 27 philips semiconductors product speci?cation i 2 c-bus programmable modulator for negative video modulation and fm sound TDA8722 notes
internet: http://www.semiconductors.philips.com philips semiconductors C a worldwide company ? philips electronics n.v. 1998 sca60 all rights are reserved. reproduction in whole or in part is prohibited without the prior written consent of the copyright owne r. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reli able and may be changed without notice. no liability will be accepted by the publisher for any consequence of its use. publication thereof does not con vey nor imply any license under patent- or other industrial or intellectual property rights. middle east: see italy netherlands: postbus 90050, 5600 pb eindhoven, bldg. vb, tel. +31 40 27 82785, fax. +31 40 27 88399 new zealand: 2 wagener place, c.p.o. box 1041, auckland, tel. +64 9 849 4160, fax. +64 9 849 7811 norway: box 1, manglerud 0612, oslo, tel. +47 22 74 8000, fax. +47 22 74 8341 pakistan: see singapore philippines: philips semiconductors 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+41 1 488 2741 fax. +41 1 488 3263 taiwan: philips semiconductors, 6f, no. 96, chien kuo n. rd., sec. 1, taipei, taiwan tel. +886 2 2134 2865, fax. +886 2 2134 2874 thailand: philips electronics (thailand) ltd., 209/2 sanpavuth-bangna road prakanong, bangkok 10260, tel. +66 2 745 4090, fax. +66 2 398 0793 turkey: talatpasa cad. no. 5, 80640 gltepe/istanbul, tel. +90 212 279 2770, fax. +90 212 282 6707 ukraine : philips ukraine, 4 patrice lumumba str., building b, floor 7, 252042 kiev, tel. +380 44 264 2776, fax. +380 44 268 0461 united kingdom: philips semiconductors ltd., 276 bath road, hayes, middlesex ub3 5bx, tel. +44 181 730 5000, fax. +44 181 754 8421 united states: 811 east arques avenue, sunnyvale, ca 94088-3409, tel. +1 800 234 7381 uruguay: see south america vietnam: see singapore yugoslavia: philips, trg n. pasica 5/v, 11000 beograd, tel. +381 11 625 344, fax.+381 11 635 777 for all other countries apply to: philips semiconductors, international marketing & sales communications, building be-p, p.o. box 218, 5600 md eindhoven, the netherlands, fax. +31 40 27 24825 argentina: see south america australia: 34 waterloo road, north ryde, nsw 2113, tel. +61 2 9805 4455, fax. +61 2 9805 4466 austria: computerstr. 6, a-1101 wien, p.o. box 213, tel. +43 160 1010, fax. +43 160 101 1210 belarus: hotel minsk business center, bld. 3, r. 1211, volodarski str. 6, 220050 minsk, tel. +375 172 200 733, fax. +375 172 200 773 belgium: see the netherlands brazil: see south america bulgaria: philips bulgaria ltd., energoproject, 15th floor, 51 james bourchier blvd., 1407 sofia, tel. +359 2 689 211, fax. +359 2 689 102 canada: philips semiconductors/components, tel. +1 800 234 7381 china/hong kong: 501 hong kong industrial technology centre, 72 tat chee avenue, kowloon tong, hong kong, tel. +852 2319 7888, fax. +852 2319 7700 colombia: see south america czech republic: see austria denmark: prags boulevard 80, pb 1919, dk-2300 copenhagen s, tel. +45 32 88 2636, fax. +45 31 57 0044 finland: sinikalliontie 3, fin-02630 espoo, tel. +358 9 615800, fax. +358 9 61580920 france: 51 rue carnot, bp317, 92156 suresnes cedex, tel. +33 1 40 99 6161, fax. +33 1 40 99 6427 germany: hammerbrookstra?e 69, d-20097 hamburg, tel. +49 40 23 53 60, fax. +49 40 23 536 300 greece: no. 15, 25th march street, gr 17778 tavros/athens, tel. +30 1 4894 339/239, fax. +30 1 4814 240 hungary: see austria india: philips india ltd, band box building, 2nd floor, 254-d, dr. annie besant road, worli, mumbai 400 025, tel. +91 22 493 8541, fax. +91 22 493 0966 indonesia: pt philips development corporation, semiconductors division, gedung philips, jl. buncit raya kav.99-100, jakarta 12510, tel. +62 21 794 0040 ext. 2501, fax. +62 21 794 0080 ireland: newstead, clonskeagh, dublin 14, tel. +353 1 7640 000, fax. +353 1 7640 200 israel: rapac electronics, 7 kehilat saloniki st, po box 18053, tel aviv 61180, tel. +972 3 645 0444, fax. +972 3 649 1007 italy: philips semiconductors, piazza iv novembre 3, 20124 milano, tel. +39 2 6752 2531, fax. +39 2 6752 2557 japan: philips bldg 13-37, kohnan 2-chome, minato-ku, tokyo 108-8507, tel. +81 3 3740 5130, fax. +81 3 3740 5077 korea: philips house, 260-199 itaewon-dong, yongsan-ku, seoul, tel. +82 2 709 1412, fax. +82 2 709 1415 malaysia: no. 76 jalan universiti, 46200 petaling jaya, selangor, tel. +60 3 750 5214, fax. +60 3 757 4880 mexico: 5900 gateway east, suite 200, el paso, texas 79905, tel. +9-5 800 234 7381 printed in the netherlands 545104/1200/02/pp28 date of release: 1998 jun 23 document order number: 9397 750 03431

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