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TDA9725 Datasheet(PDF) 7 Page - NXP Semiconductors |
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TDA9725 Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 44 page  1996 Oct 14 7 Philips Semiconductors Product specification Y/C automatic adjustment processor (VHS standard) TDA9725 FUNCTIONAL DESCRIPTION Record (REC)/electric to electric (EE) mode LUMINANCE From input pin 43 the CVBS signal is fed via the automatic gain control (AGC) and subclamp (SCL) to the output pin 41. Instead of the controlled and clamped CVBS signal it is also possible to switch (dependent on the level at pin 42) white, black or sync-level to this pin. To eliminate chrominance parts the CVBS signal is fed to the luminance low-pass filter (YLPF) and to the sync separator stage. The sync signal is available at pin 45. The signal is also fed via vertical emphasis non-linear emphasis (NLE), deviation control stage, main emphasis and white-dark clip to the FM modulator. The FM signal is available at pin 11. CHROMINANCE The chrominance signal is selected out of CVBS (from pin 43) in BPF 4.43 MHz (band-pass filter) and controlled in automatic chrominance control (ACC). The chrominance signal is mixed with 5.06 MHz to 627 kHz and via LPF 627 kHz to the output pin 30. Playback (PB)/video to video (VV) mode LUMINANCE The FM signal is fed via FM AGC and double limiter to the controlled FM demodulator. After demodulation and filtering in sub low-pass filter (SUBLPF) main de-emphasis, YLPF and non-linear de-emphasis the signal is fed to the vertical noise reduction (YNR) and in parallel to the sync separator. The chrominance signal is added in the Y/C mixer. The complete CVBS signal is available at pin 41. CHROMINANCE The 627 kHz chrominance signal coming from tape via BPF 627 kHz and field ACC to the balanced mixer. Mixed with 5.06 MHz the 4.43 MHz chrominance signal is fed via comb driver stage to the external comb filter (pin 35) and via internal conjugated complex (C*) stage and internal AC coupling to the luminance part. Record and playback In both modes record (REC) and playback (PB) the 5.06 MHz mixer frequency is produced by the 20.24 MHz voltage controlled oscillator (VCO) and a divide-by-four. LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). Note 1. Charge device model class B: discharging a 200 pF capacitor via a 0 Ω series resistor. THERMAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT VCC supply voltage 0 − 6.0 V VI input voltage at pin 22 0 − 1.6 V Vn input voltage on all other pins 0 − VCC V II input current at pin 22 −− 10 mA Ptot total power dissipation −− 1250 mW Tstg storage temperature −25 − +150 °C Tamb operating ambient temperature −20 − +70 °C Ves electrostatic handling for all pins note 1 −300 − +300 V SYMBOL PARAMETER VALUE UNIT Rth j-a thermal resistance from junction to ambient in free air 43 K/W |
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Similar Description - TDA9725 |
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