PDF TDA8722T Data sheet ( Hoja de datos )

Número de pieza	TDA8722T
Descripción	I2C-bus programmable modulator for negative video modulation and FM sound
Fabricantes	NXP Semiconductors
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No Preview Available ! 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 1 page Philips Semiconductors I2C-bus programmable modulator for negative video modulation and FM sound Product speciﬁcation 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 ampliﬁer output CP 8 charge pump output XTAL 9 crystal oscillator DGND 10 digital ground VDDD SCL SDA 11 digital supply voltage 12 serial clock input (I2C-bus) 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 handbook, halfpage AUDIO 1 SOSCA 2 20 VDDA 19 VIDEO SOSCB 3 18 AGND UOSCB 4 17 ADJUST OGND 5 UOSCA 6 16 RFA TDA8722 15 RFB AMP 7 14 P0 CP 8 13 SDA XTAL 9 12 SCL DGND 10 11 VDDD MBE394 Fig.2 Pin configuration. 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 kΩ 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 5 5 Page Philips Semiconductors I2C-bus programmable modulator for negative video modulation and FM sound Product speciﬁcation TDA8722 SYMBOL PARAMETER S/N audio audio signal-to-noise ratio faudio P/S frequency response of the audio signal picture-to-sound ratio ∆P/S picture-to-sound ratio range Channel characteristics fRF RF frequency range VRF output level on RFA and RFB ∆VRF SPO RFsh SCsh difference between the level of modulated carrier and the level of the unmodulated carrier spurious outside channel RF second harmonic level on asymmetrical output sound carrier second harmonic level SCth fref IM sound carrier third harmonic level video signal harmonics reference frequency spurious chrominance beat Charge pump output (CP) I8 output current V7 output voltage IOZ OFF-state leakage current Ampliﬁer output (AMP) G ampliﬁer current gain V7sat output saturation voltage Crystal oscillator characteristics (XTAL) Z9 oscillator input impedance CONDITIONS note 6 note 7 no audio signal; FM = 5.5 MHz; C17 = 15 pF no audio signal; FM = 5.5 MHz; 0 pF ≤ C17 ≤ 39 pF MIN. 45 −1 −16 TYP. 50 − −13 MAX. − +1 −10 UNIT dB dB dB −18 − −10 dB using tank circuit of Fig.7 asymmetrical output loaded with 75 Ω; f = 471.25 to 855.25 MHz measurement is made during synchronization pulse for the modulated carrier note 8 fRF = 471.25 MHz fRF = 855.25 MHz fs = 5.5 MHz; C17 = 15 pF; fRF < 700 MHz fs = 5.5 MHz; C17 = 15 pF; fRF > 700 MHz fs = 5.5 MHz; C17 = 15 pF note 9 fp + 31.25 kHz note 10 471.25 77 0 − − − − − − − − − − 80 1 −62 −30 −20 −65 −63 −65 −60 −65 −65 855.25 MHz 83 dBµV 2 dB − dBc −25 dBc −15 dBc −60 dBc −58 dBc −60 dBc −55 dBc −60 dBc −60 dBc in lock VCP = 2 V; T0 = 1; T1 = 1; T2 = 1 − 1.5 − ±100 − − − 2.5 10 µA V nA VCP = 2 V; IAMP = 10 µA VCP = 0 V; T0 = 1; T1 = 0; T2 = 1 − − 4000 − 140 200 mV − − −500 Ω 1998 Jun 23 11 11 Page

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