INTEGRATED CIRCUITS DATA SHEET TDA8722 I2C-bus programmable modulator for negative video modulation and FM sound Product specification Supersedes data of 1995 Mar 21 File under Integrated Circuits, IC02 1998 Jun 23 Philips Semiconductors Product specification I2C-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 GENERAL DESCRIPTION • External adjusting of modulation depth and level of the sound subcarrier 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). • I2C-bus receiver for frequency setting and test-mode selection • One I2C programmable output port • On-chip Phase-Locked Loop (PLL) frequency synthesizer 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 I2C-bus format. • On-chip power supply regulator • Bus switchable oscillator • On-chip Test Pattern Signal Generator (TPSG). APPLICATIONS • Video recorders • Cable converters • Satellite receivers. ORDERING INFORMATION TYPE NUMBER PACKAGE NAME TDA8722T SO20 TDA8722M SSOP20 1998 Jun 23 DESCRIPTION VERSION plastic small outline package; 20 leads; body width 7.5 mm SOT163-1 plastic shrink small outline package; 20 leads; body width 4.4 mm SOT266-1 2 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 QUICK REFERENCE DATA VDDA = VDDD = 5 V; Tamb = 25 °C after the IC has reached thermal equilibrium; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT VDDA analog supply voltage 4.5 5.0 5.5 V VDDD digital supply voltage 4.5 5.0 5.5 V IDD total supply current normal mode 41 52 63 mA ∆m typical modulation depth range video level (pin 19) = 0.5 V (p-p); note 1; see Fig.10 65 − 90 % ∆P/S typical picture-to-sound level range note 2; see Fig.11 −18 − −10 dB VRF RF output voltage level asymmetrical on a 75 Ω load frequency between 471.25 and 855.25 MHz 77 80 83 dBµV δf FM deviation on audio subcarrier fi = 400 Hz; V1 = 0.5 V (RMS); before pre-emphasis filter 20 25 30 kHz Notes 1. Value depends on value of resistor R17 (see Fig.7). 2. Value depends on value of capacitor C17 (see Fig.7). 1998 Jun 23 3 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 BLOCK DIAGRAM VIDEO handbook, full pagewidth ADJUST 19 17 TDA8722 CLAMP AGND VDDA 18 20 RFA RFB 16 15 ASYMMETRICAL OUTPUT BUFFER VOLTAGE REGULATOR VIDEO AMP CLIP AUDIO SOSCA SOSCB 1 TPSG 2 3 MIXER SWITCH AUDIO FM MODULATOR TPSG on PC balance test SDA SCL P0 13 12 12-BIT DIVIDER (N) I 2C-BUS RECEIVER 6 5 4 UOSCA OGND UOSCB 10 bits 14 RF oscillator on enable/ select 8 CP f DIV PHASE DETECTOR LOGIC f ref 11 10 VDDD DGND CHARGE PUMP 7 AMP AMP enable 31.25 kHz DIVIDER (M = 128) 9 4 MHz OSCILLATOR MBE401 Fig.1 Block diagram. 1998 Jun 23 UHF OSCILLATOR PRESCALER (8) 4 XTAL Philips Semiconductors Product specification I2C-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 CP XTAL DGND handbook, halfpage AUDIO 1 20 VDDA SOSCA 2 19 VIDEO tuning amplifier output SOSCB 3 18 AGND 8 charge pump output UOSCB 4 17 ADJUST 9 crystal oscillator OGND 5 10 digital ground VDDD 11 digital supply voltage SCL 12 serial clock input (I2C-bus) SDA 13 serial data input (I2C-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 VDDA 20 analog supply voltage UOSCA 6 15 RFB AMP 7 14 P0 CP 8 13 SDA XTAL 9 12 SCL 11 VDDD DGND 10 MBE394 Fig.2 Pin configuration. and ground (R17). The value can change between 47 kΩ and infinite (R17 removed); see Fig.10. FUNCTIONAL DESCRIPTION The TDA8722 is a programmable modulator which can be divided into two main blocks: 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). • 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 1998 Jun 23 16 RFA TDA8722 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). 5 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound 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 kΩ. TDA8722 N is a 12-bit dividing number (10 bits are programmable by the I2C-bus). fref is the crystal frequency (4 MHz) divided by 128 (31.25 kHz). 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. 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: f osc f xtal f DIV = ------------= --------- = f ref 8×N 128 • 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 Ω resistor (see Fig.7). During the test mode operation, fDIV and fref can be monitored on the output Port pin (pin 14). Software information The oscillator frequency is set by a programmable PLL frequency synthesizer in accordance with equation: The synthesizer is controlled via a two-wire I2C-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. fosc = 8 × N × fref Where: fosc is the local oscillator frequency. MBE395 handbook, full pagewidth 0 10 20 30 40 50 60 t (µs) Fig.3 Test pattern signal. 1998 Jun 23 6 70 64 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound Table 1 TDA8722 Data format; notes 1 and 2 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 1 T0(3) T1(3) T2(3) P0(4) b4 b3 b2 ACK BYTE Data byte 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 BITS(1) RESULT Frequency (MHz)(3) b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1(2) b0(2) 512 256 128 64 32 16 8 4 2 1 0.5 0.25 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. fosc = 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) BITS RESULT Value Frequency (MHz)(2) b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1(1) b0(1) 0 1 1 1 0 1 0 1 1 1 0 1 0 256 128 64 0 16 0 4 2 1 0 0.25 Notes 1. Bits b1 and b0 are not programmable. 2. fosc = 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) 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 BYTE 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. 1998 Jun 23 7 Philips Semiconductors Product specification I2C-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 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 1 0 0 fref out (if p0 = 0); note 4 1 0 1 high-impedance test; note 5 1 1 0 fDIV out (if p0 = 0); note 4 1 1 1 phase detector disabled; baseband signals on RF outputs; note 6 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 ‘fref’ and ‘fDIV’ modes, the reference frequency fref in the phase comparator or the divided RF oscillator frequency fDIV 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. The possibilities of bit P0, which controls the output Port (pin 14) are given in Table 6. Table 6 P0 The Port is an NPN open-collector type. For monitoring the fref or fDIV frequency on the output Port, the P0 bit must be logic 0 to let the output Port free. 1998 Jun 23 8 Output Port programming OUTPUT PORT STATE 0 off; high impedance 1 on; sinking current Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER MIN. MAX. UNIT VDDA analog supply voltage −0.3 +6 V VDDD digital supply voltage −0.3 +6 V VDD operating supply voltage 4.5 5.5 V Vmax maximum voltage on all pins −0.3 VDD V Tstg IC storage temperature −40 +125 °C Tamb operating ambient temperature −20 +85 °C 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 Ω, 200 pF (200 V). THERMAL RESISTANCE SYMBOL Rth j-a 1998 Jun 23 PARAMETER VALUE UNIT SO20; SOT163-1 85 K/W SSOP20; SOT266-1 120 K/W thermal resistance from junction to ambient in free air 9 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 CHARACTERISTICS VDDA = VDDD = 5 V; Tamb = 25 °C; valid over the whole UHF band; measured in circuit of Fig.7; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supply IDD supply current normal mode 41 52 63 mA RF off test mode 30 38 46 mA Video characteristics I19 input current (AC) V19 = 3.2 V − 0.5 2.0 µA z19 video input impedance V19 = 3.2 V 30 − − kΩ m modulation depth V19 = 500 mV (p-p) EBU 77 colour bars; R17 = 120 kΩ; see Fig.7 82 87 % during clipping condition; note 1 85 − 98 % TPSG mode; R17 = 120 kΩ 72 82 92 % balance test mode; R17 = 120 kΩ 110 − − % ∆m modulation depth range V19 = 500 mV (p-p) EBU colour bars; 47 kΩ ≤ R17 ≤ ∞ 65 − 90 % ∆mAPL variation of modulation depth with change of APL between 10 and 90% referenced to the value for APL = 50%; V19 = 500 mV (p-p) −2 − +2 % Vclip(p-p) video input level where clipping starts (peak-to-peak value) video level on pin 19; note 2 − 0.56 − V fRF < 700 MHz; note 3 48 52 − dB S/N video video signal-to-noise ratio fRF > 700 MHz; note 3 46 50 − dB Gdiff differential gain note 4 −8 − +8 % φdiff differential phase note 4 −8 − +8 deg V/S video-to-sync ratio V19 = 500 mV (p-p); V/S = 7/3 6.9/3.1 7/3 7.1/2.9 fvideo frequency response for the video signal note 5 −1 − +1 dB Audio characteristics (for PAL G standard; audio subcarrier at 5.5 MHz) Z1 audio input impedance 30 − − kΩ δm modulation deviation f1 = 400 Hz; V1 = 0.5 V (RMS) before pre-emphasis filter 20 25 30 kHz δmmax maximum modulation deviation f1 = 400 Hz; V1 = 2.0 V (RMS) before pre-emphasis filter 60 85 − kHz THD total harmonic distortion f1 = 1 kHz; V1 = 0.5 V (RMS) before pre-emphasis filter − 0.4 1.5 % 1998 Jun 23 10 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound SYMBOL PARAMETER S/N audio audio signal-to-noise ratio TDA8722 CONDITIONS MIN. TYP. MAX. UNIT note 6 45 50 − dB faudio 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 = 15 pF −16 −13 −10 dB ∆P/S picture-to-sound ratio range no audio signal; FM = 5.5 MHz; 0 pF ≤ C17 ≤ 39 pF −18 − −10 dB Channel characteristics fRF RF frequency range using tank circuit of Fig.7 471.25 − 855.25 MHz VRF output level on RFA and RFB asymmetrical output loaded with 75 Ω; f = 471.25 to 855.25 MHz 77 80 83 dBµV ∆VRF difference between the level of modulated carrier and the level of the unmodulated carrier measurement is made during synchronization pulse for the modulated carrier 0 1 2 dB SPO spurious outside channel note 8 − −62 − dBc RFsh RF second harmonic level on asymmetrical output fRF = 471.25 MHz − −30 −25 dBc fRF = 855.25 MHz − −20 −15 dBc fs = 5.5 MHz; C17 = 15 pF; fRF < 700 MHz − −65 −60 dBc fs = 5.5 MHz; C17 = 15 pF; fRF > 700 MHz − −63 −58 dBc sound carrier third harmonic level fs = 5.5 MHz; C17 = 15 pF − −65 −60 dBc video signal harmonics note 9 − −60 −55 dBc fref reference frequency spurious fp + 31.25 kHz − −65 −60 dBc IM chrominance beat note 10 − −65 −60 dBc SCsh SCth sound carrier second harmonic level Charge pump output (CP) I8 output current − ±100 − µA V7 output voltage in lock 1.5 − 2.5 V IOZ OFF-state leakage current VCP = 2 V; T0 = 1; T1 = 1; T2 = 1 − − 10 nA Amplifier output (AMP) G amplifier current gain VCP = 2 V; IAMP = 10 µA − 4000 − V7sat output saturation voltage VCP = 0 V; T0 = 1; T1 = 0; T2 = 1 − 140 200 mV − − −500 Ω Crystal oscillator characteristics (XTAL) Z9 1998 Jun 23 oscillator input impedance 11 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound SYMBOL PARAMETER TDA8722 CONDITIONS MIN. TYP. MAX. UNIT Output Port characteristics (P0) VOL LOW level output voltage P0 = 1; I14 = 5 mA − 150 400 mV IOZ OFF-state leakage current P0 = 0; VDD = 5.5 V − − 10 µA I14(max) maximum Port current P0 = 1 − − 10 mA I2C-bus receiver characteristics (SDA and SCL) VIH HIGH level input voltage 3 − 5.5 V VIL LOW level input voltage 0 − 1.5 V IIH HIGH level input current VIH = 5 V; VDD = 0 or 5 V − − 10 µA IIL LOW level input current VIL = 0 V; VDD = 0 or 5 V −10 − − µA Vo output voltage on SDA during acknowledge pulse; IIL = 3 mA − − 0.4 V Notes 1. Modulation depth when the video signal is between 560 and 1000 mV (peak-to-peak value) at pin 19. R17 = 120 kΩ 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 (fRF + 2fs, 2fRF + fs, etc.). This measurement includes the spurious at the 1⁄4fRF, 1⁄2fRF and 3⁄4fRF. 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 fRF + 2 MHz, fRF + 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. 1998 Jun 23 12 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 MBE396 handbook, full pagewidth 1V 0.3 V 0V 0 10 20 30 40 50 60 70 64 t (µs) Fig.4 CCIR insertion line N.17. MBE397 handbook, full pagewidth 1V 0.3 V 0V 0 10 20 30 40 50 60 t (µs) Fig.5 CCIR insertion line N.330. 1998 Jun 23 13 70 64 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 INTERNAL PIN CONFIGURATION handbook, full pagewidth VOLTAGE REGULATOR AUDIO 20 UOSCB 3 17 4 16 OGND UOSCA AMP 15 5 AGND ADJUST RFA RFB 6 14 P0 7 13 CP VIDEO 2 18 SOSCB DDA 1 19 SOSCA V SDA 8 9 XTAL 12 DGND 11 MBE402 ESD protection components are not shown in the diagram. Fig.6 Pin equivalent circuit for each pin. 1998 Jun 23 SCL 10 14 V DDD Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 APPLICATION INFORMATION VIDEO RF 75 Ω 100 nF C19 handbook, full pagewidthR20 470 Ω R15 R19 470 Ω R18 82 Ω PORT 75 Ω 15 pF 100 nF C17 100 pF C16 R17 120 kΩ 1 kΩ R14 100 pF C15 SCL C20 SDA 20 19 18 17 16 15 14 13 12 11 Q9 10 nF TDA8722 4 MHz C11 27 pF 1 2 3 4 5 6 7 8 L5 (2) K1 AUDIO (1) C1 220 pF R1 220 kΩ R4 220 Ω R2 12 kΩ C3 56 pF R3 15 kΩ L3 (3) 33 pF C5 D5 C9 R8 12 kΩ R9 33 V R6 22 kΩ 22 kΩ 5V R7 15 µH K2 10 150 nF C8 33 pF C6 BB215 R5 22 kΩ 9 (4) C30 10 nF 12 kΩ 10 nF C7 C31 2.2 µF T8 BC547B MBE403 (1) (2) (3) (4) K1: switches the pre-emphasis filter on or off. L5: air coil; 1.5 turns; diameter of 2 mm. L3: to adjust the application to the right sound carrier frequency (5.5 MHz for PAL G). K2: Switches the FM sound oscillator on or off. Fig.7 Reference measuring set-up. 1998 Jun 23 C21 2.2 µF 15 GND Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 Application design handbook, full pagewidth VIDEO RF 75 Ω 100 nF C19 R20 470 Ω R15 75 Ω R19 470 Ω R18 82 Ω PORT 100 kΩ RV1 (1) 15 pF 100 nF 82 kΩ R17 100 pF C16 100 pF C15 SCL SDA C20 C17 20 19 18 5V 17 16 15 14 13 12 11 Q9 10 nF TDA8722 4 MHz C11 27 pF 1 2 3 4 5 6 7 8 L5 33 pF C5 C3 AUDIO C1 220 pF R1 220 kΩ R2 12 kΩ 56 pF R3 15 kΩ D5 10 C9 150 nF C8 33 pF C6 R8 12 kΩ R9 BB215 R5 22 kΩ 9 33 V R6 22 kΩ L3 22 kΩ R7 15 µH C30 10 nF 12 kΩ 10 nF C7 T8 BC547B MBE405 (1) RV1 allows fine adjustment of the modulation depth between 70 and 90%. Fig.8 Application using an asymmetrical output. 1998 Jun 23 16 GND Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound RF 75 Ω handbook, full pagewidth VIDEO 100 nF C19 R20 470 Ω 6 R19 470 Ω R18 82 Ω TDA8722 1 TOKO - B4F 617DB - 1010 4 TR1 2 3 PORT 100 nF R17 120 kΩ C17 C20 R15 300 Ω 100 pF C16 15 pF SCL SDA 100 pF C15 5V 20 19 18 17 16 15 14 13 12 11 Q9 10 nF TDA8722 1 2 3 4 5 4 MHz C11 6 7 8 9 27 pF 10 C9 L5 C3 AUDIO C1 56 pF R3 220 pF R1 15 kΩ L3 220 kΩ R2 12 kΩ 15 µH 150 nF C8 33 pF C5 D5 BB215 R5 22 kΩ 33 pF C6 R8 12 kΩ R9 33 V 22 kΩ R6 22 kΩ R7 12 kΩ 10 nF C7 C30 10 nF T8 BC547B MBE404 GND Fig.9 Application using a symmetrical output with a balun transformer. 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. 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). 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 1998 Jun 23 17 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound Modulation depth TDA8722 Table 7 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. Value of resistor for several Q factor ranges COIL QUALITY FACTOR PROPOSED VALUE FOR R3 (kΩ) 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 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 ≥50. 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. 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. 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). 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. MBE398 100 handbook, halfpage modulation depth (%) 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. 90 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). 80 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. 70 60 10 102 R17 (kΩ) 10 3 Fig.10 Typical modulation depth as a function of the value of R17. 1998 Jun 23 18 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 MBE399 8 MBE400 14 handbook, halfpage handbook, halfpage RF harmonics (dBc) P/S (dB) third harmonic 18 12 22 16 (1) (2) (3) (4) 26 second harmonic 20 0 10 20 30 C17 (pF) 30 450 40 R17 = 120 kΩ. (1) 4.5 MHz. (2) 5.5 MHz. (3) 6.0 MHz. (4) 6.5 MHz. Fig.11 Typical picture-to-sound ratio as a function of the value of C17. 650 750 850 RF (MHz) Fig.12 Typical level of RF harmonics for an asymmetrical application. The input impedance on pin 17 is approximately 3500 Ω, 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. 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 kΩ. 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. 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. 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). In addition, the internal FM sound modulator can be switched off by short-circuiting pins 2 and 3. 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. 1998 Jun 23 550 19 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 RF 75 Ω handbook, full pagewidth SECOND CARRIER VIDEO R15 75 Ω R21 10 kΩ 10 pF C21 R20 470 Ω 100 nF C19 R18 82 Ω R17 120 kΩ R19 470 Ω 100 pF C16 100 pF C15 C17 PORT 100 nF C20 20 19 18 17 16 15 14 TDA8722 Fig.13 Possible application for a second sound subcarrier. 1998 Jun 23 20 MGC419 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 PACKAGE OUTLINES SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1 D E A X c HE y v M A Z 11 20 Q A2 A (A 3) A1 pin 1 index θ Lp L 1 10 e bp detail X w M 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y mm 2.65 0.30 0.10 2.45 2.25 0.25 0.49 0.36 0.32 0.23 13.0 12.6 7.6 7.4 1.27 10.65 10.00 1.4 1.1 0.4 1.1 1.0 0.25 0.25 0.1 0.9 0.4 inches 0.10 0.012 0.096 0.004 0.089 0.01 0.019 0.013 0.014 0.009 0.51 0.49 0.30 0.29 0.050 0.419 0.043 0.055 0.394 0.016 0.043 0.039 0.01 0.01 0.004 0.035 0.016 Z (1) θ 8o 0o Note 1. Plastic or metal protrusions of 0.15 mm maximum per side are not included. REFERENCES OUTLINE VERSION IEC JEDEC SOT163-1 075E04 MS-013AC 1998 Jun 23 EIAJ EUROPEAN PROJECTION ISSUE DATE 95-01-24 97-05-22 21 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 SSOP20: plastic shrink small outline package; 20 leads; body width 4.4 mm D SOT266-1 E A X c y HE v M A Z 11 20 Q A2 A (A 3) A1 pin 1 index θ Lp L 1 10 detail X w M bp e 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y Z (1) θ mm 1.5 0.15 0 1.4 1.2 0.25 0.32 0.20 0.20 0.13 6.6 6.4 4.5 4.3 0.65 6.6 6.2 1.0 0.75 0.45 0.65 0.45 0.2 0.13 0.1 0.48 0.18 10 0o Note 1. Plastic or metal protrusions of 0.20 mm maximum per side are not included. OUTLINE VERSION REFERENCES IEC JEDEC EIAJ ISSUE DATE 90-04-05 95-02-25 SOT266-1 1998 Jun 23 EUROPEAN PROJECTION 22 o Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 SOLDERING SSOP Introduction 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. 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. 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. 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). • The longitudinal axis of the package footprint must be parallel to the solder flow and must incorporate solder thieves at the downstream end. Reflow soldering 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). 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. METHOD (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. 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. 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. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 minutes at 45 °C. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. Wave soldering SO Repairing soldered joints Wave soldering techniques can be used for all SO packages if the following conditions are observed: Fix the component by first soldering two diagonallyopposite 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. • 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. 1998 Jun 23 23 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound TDA8722 DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. 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 specification 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 specification. 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 I2C COMPONENTS Purchase of Philips I2C components conveys a license under the Philips’ I2C patent to use the components in the I2C system provided the system conforms to the I2C specification defined by Philips. This specification can be ordered using the code 9398 393 40011. 1998 Jun 23 24 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound NOTES 1998 Jun 23 25 TDA8722 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound NOTES 1998 Jun 23 26 TDA8722 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound NOTES 1998 Jun 23 27 TDA8722 Philips Semiconductors – a worldwide company 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. 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The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Printed in The Netherlands 545104/1200/02/pp28 Date of release: 1998 Jun 23 Document order number: 9397 750 03431