DatasheetsPDF.com

TDA8722 Dataheets PDF



Part Number TDA8722
Manufacturers NXP
Logo NXP
Description I2C-bus programmable modulator for negative video modulation and FM sound
Datasheet TDA8722 DatasheetTDA8722 Datasheet (PDF)

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 FEATURES • Video amplifier with clamp and white clip circuits • FM sound modulator • Asymmetrical and symmetrical RF outputs available • Symmetrical RF oscillator .

  TDA8722   TDA8722



Document
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 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 • I2C-bus receiver for frequency setting and test-mode selection • One I2C 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. ORDERING INFORMATION TYPE NUMBER TDA8722T TDA8722M PACKAGE NAME SO20 SSOP20 DESCRIPTION plastic small outline package; 20 leads; body width 7.5 mm plastic shrink small outline package; 20 leads; body width 4.4 mm GENERAL DESCRIPTION TDA8722 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 I2C-bus format. VERSION SOT163-1 SOT266-1 1998 Jun 23 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 VDDA VDDD IDD ∆m ∆P/S VRF δf Notes 1. Value depends on value of resistor R17 (see Fig.7). 2. Value depends on value of capacitor C17 (see Fig.7). PARAMETER analog supply voltage digital supply voltage total supply current typical modulation depth range typical picture-to-sound level range RF output voltage level asymmetrical on a 75 Ω load FM deviation on audio subcarrier normal mode video level (pin 19) = 0.5 V (p-p); note 1; see Fig.10 note 2; see Fig.11 frequency between 471.25 and 855.25 MHz fi = 400 Hz; V1 = 0.5 V (RMS); before pre-emphasis filter CONDITIONS MIN. 4.5 4.5 41 65 −18 77 20 TYP. 5.0 5.0 52 − − 80 25 MAX. 5.5 5.5 63 90 −10 83 30 UNIT V V mA % dB dBµV kHz 1998 Jun 23 3 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound BLOCK DIAGRAM TDA8722 handbook, full pagewidth VIDEO 19 CLAMP ADJUST 17 AGND 18 VDDA 20 RFA 16 RFB 15 TDA8722 VIDEO AMP VOLTAGE REGULATOR ASYMMETRICAL OUTPUT BUFFER CLIP AUDIO SOSCA SOSCB 1 2 3 AUDIO FM MODULATOR TPSG on balance test 13 I 2C-BUS RECEIVER 10 bits enable/ select f DIV LOGIC f ref PHASE DETECTOR enable CHARGE PUMP AMP TPSG SWITCH MIXER PC 6 5 4 UOSCA OGND UOSCB SDA SCL 12 12-BIT DIVIDER (N) PRESCALER (8) UHF OSCILLATOR P0 14 RF oscillator on 8 CP 7 AMP 31.25 kHz 11 VDDD 10 DGND DIVIDER (M = 128) 4 MHz OSCILLATOR 9 XTAL MBE401 Fig.1 Block diagram. 1998 Jun 23 4 Philips Semiconductors Product specification I2C-bus programmable modulator for negative video modulation and FM sound PINNING SYMBOL PIN AUDIO SOSCA SOSCB UOSCB OGND UOSCA AMP CP XTAL DGND VDDD SCL SDA P0 RFB RFA ADJUST AGND VIDEO VDDA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 audio input sound oscillator A sound oscillator B UHF oscillator B RF oscillator ground UHF oscillator A tuning amplifier output charge pump output crystal oscillator digital ground digital supply voltage serial clock input (I2C-bus) serial data input (I2C-bus) NPN open-collector output Port asymmetrical RF output B asymmetrical RF output A modulation depth and picture-to-sound distance adjustment pin analog ground video input analog supply voltage Fig.2 Pin configuration. SOSCA SOSCB UOSCB OGND UOSCA AMP CP XTAL 2 3 4 5 handbook, halfpage TDA8722 DESCRIPTION AUDIO 1 20 VDDA 19 VIDEO 18 AGND 17 ADJUST 16 RFA TDA8722 6 7 8 9 15 RFB 14 P0 13 SDA 12 SCL 11 VDDD MBE394 DGND 10 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). .


TDA8718 TDA8722 TDA8725T


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)