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TDA9809M Datasheet(PDF) 5 Page - NXP Semiconductors |
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TDA9809M Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 40 page 1998 Jan 08 5 Philips Semiconductors Preliminary specification Single standard multimedia IF-PLL and FM radio demodulator TDA9809M PINNING SYMBOL PIN DESCRIPTION ViVIF1 1 VIF differential input signal voltage 1 ViVIF2 2 VIF differential input signal voltage 2 LP0 3 logic port 0 ViRIF 4 RIF input CVAGC 5 VIF AGC capacitor TPLL 6 PLL loop filter VoAF 7 audio output LP2 8 logic port 2 and soft mute threshold adjustment CDEC 9 decoupling capacitor Vo(int) 10 intercarrier output voltage ViFM 11 sound intercarrier input voltage TAGC 12 TV/radio tuner AGC output Vo(vid) 13 composite video output voltage AFC 14 AFC/RIF level output VCO1 15 VCO1 resonance circuit VCO2 16 VCO2 resonance circuit GND 17 ground CERRES 18 ceramic resonator 10.7 MHz VP 19 supply voltage TADJ 20 tuner AGC takeover point adjustment Fig.2 Pin configuration. handbook, halfpage ViVIF1 ViVIF2 LP0 ViRIF CVAGC TPLL VoAF LP2 CDEC Vo(int) TADJ VP CERRES GND VCO1 AFC VCO2 Vo(vid) TAGC ViFM 1 2 3 4 5 6 7 8 9 10 11 12 20 19 18 17 16 15 14 13 TDA9809M MHA958 FUNCTIONAL DESCRIPTION The TDA9809M is comprised of the functional blocks shown in Fig.1: • Vision IF amplifier and AGC detector • Tuner (TV/radio) and VIF AGC • Frequency Phase-Locked Loop (FPLL) detector • VCO, Travelling Wave Divider (TWD) and TV AFC • Video demodulator and amplifier • Intercarrier mixer • RIF amplifier and AGC detector • FM-PLL demodulator, level detector and radio AFC • Audio Frequency (AF) signal processing • Internal voltage stabilizer • Logic. Vision IF amplifier and AGC detector The vision IF amplifier contains three AC-coupled differential amplifier stages. Each differential stage includes a feedback network controlled by emitter degeneration. The AGC detector generates the required VIF gain control voltage for constant video output by charging/discharging the AGC capacitor. The sync level of the video signal is therefore detected for negative video modulation. Tuner (TV/radio) and VIF AGC For TV operation, the AGC capacitor voltage is converted to an internal IF control signal and then fed to the tuner AGC to generate the tuner AGC output current at pin TAGC (open-collector output). The tuner AGC takeover point can be adjusted at pin TADJ. This allows the tuner to be matched to the SAW filter in order to achieve the optimum IF input level. For FM radio operation, an AGC detector is provided to obtain some adjacent channel protection. |
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