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TDA4655 Dataheets PDF



Part Number TDA4655
Manufacturers NXP
Logo NXP
Description Generic multi-standard decoder
Datasheet TDA4655 DatasheetTDA4655 Datasheet (PDF)

INTEGRATED CIRCUITS DATA SHEET TDA4655 Generic multi-standard decoder Preliminary specification File under Integrated Circuits, IC02 June 1993 Philips Semiconductors Preliminary specification Generic multi-standard decoder FEATURES • Low voltage (8 V) • Low power dissipation (250 mW) • Automatic standard recognition • No adjustments required • Reduced external components • Not all time constants integrated (ACC, SECAM de-emphasis). QUICK REFERENCE DATA SYMBOL Supply VP IP Ptot Inputs V11 V24 .

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INTEGRATED CIRCUITS DATA SHEET TDA4655 Generic multi-standard decoder Preliminary specification File under Integrated Circuits, IC02 June 1993 Philips Semiconductors Preliminary specification Generic multi-standard decoder FEATURES • Low voltage (8 V) • Low power dissipation (250 mW) • Automatic standard recognition • No adjustments required • Reduced external components • Not all time constants integrated (ACC, SECAM de-emphasis). QUICK REFERENCE DATA SYMBOL Supply VP IP Ptot Inputs V11 V24 Outputs V1 colour difference output signals (peak-to-peak value) −(R−Y) output PAL and NTSC 4.43 MHz NTSC 3.58 MHz SECAM V3 −(B-Y) output PAL and NTSC 4.43 MHz NTSC 3.58 MHz SECAM Notes to quick reference data 1. Within 2 dB output voltage deviation. 2. Burstkey width for PAL 4.3 µs, for NTSC 3.6 µs. Burst width for PAL and NTSC 2.25 µs ratio burst chrominance amplitude 1/2.2. ORDERING INFORMATION EXTENDED TYPE NUMBER TDA4655 TDA4655T Note 1. SOT234-1; 1996 November 26. 2. SOT137-1; 1996 November 26. June 1993 2 PACKAGE PINS 24 24 PIN POSITION SDIL SO MATERIAL plastic plastic independent of supply voltage; note 2 442 370 950 559 468 525 440 1050 665 557 chrominance input voltage (peak-to-peak value) note 1 sandcastle input voltage 20 − 200 − supply voltage supply current total power dissipation 7.2 VP = 8.0 V; without load 25 VP = 8.0 V; without load − 8.0 31 248 PARAMETER CONDITIONS MIN. TYP. GENERAL DESCRIPTION TDA4655 The TDA4655 is a monolithic integrated multi-standard colour decoder for PAL, SECAM and NTSC (3.58 and 4.43 MHz) with negative colour difference output signals. It is adapted to the integrated baseband delay line TDA4660/61. MAX. UNIT 8.8 37 296 V mA mW 400 13.2 mV V 624 523 1150 791 662 1460 mV mV mV mV mV mV 1200 1330 CODE SOT234 (1) SOT137A (2) Philips Semiconductors Preliminary specification Generic multi-standard decoder TDA4655 June 1993 3 Fig.1 Block diagram. Philips Semiconductors Preliminary specification Generic multi-standard decoder PINNING SYMBOL −(R−Y)o DEEM −(B−Y)o CFOB GND1 GND2 IREF VP1 VP2 CFOR CHRI CACC HUE NIDT PIDT OSC1 PLL OSC2 2FSC NO1 NO2 SECO PALO SC PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 DESCRIPTION colour difference signal output −(R−Y)* for baseband delay line external capacitor for SECAM de-emphasis colour difference signal output −(B−Y)* for baseband delay line external capacitor SECAM demodulator control (B−Y) Channel ground ground external resistor for SECAM oscillator supply 8 V supply 8 V external capacitor SECAM demodulator control (R−Y) Channel chrominance signal input external capacitor for ACC control input for HUE control and service switch external capacitor for identification circuit (NTSC) external capacitor for identification circuit (PAL and SECAM) PAL crystal external loop filter NTSC crystal 2 × fSC output standard setting input/output for NTSC 4.43 standard setting input/output for NTSC 3.58 standard setting input/output for SECAM standard setting input/output for PAL sandcastle input TDA4655 Fig.2 Pin configuration. June 1993 4 Philips Semiconductors Preliminary specification Generic multi-standard decoder FUNCTIONAL DESCRIPTION The IC contains all functions required for the identification and demodulation of signals with the standards PAL, SECAM, NTSC 3.5 with 3.58 MHz colour-carrier frequency and NTSC 4.3 with 4.43 MHz colour-carrier frequency. When an unknown signal is fed into the input, the circuit has to detect the standard of the signal, and has to switch on successively the appropriate input filter, crystal (8.8 or 7.2 MHz) and demodulator and finally, after having identified the signal, it has to switch on the colour and, in event of NTSC reception, the hue control. At the outputs the two colour difference signals −(R−Y)* and -(B−Y)* are available. The identification circuit is able to discriminate between NTSC signals with colour-carrier frequencies of 3.58 MHz or 4.43 MHz. ACC-stage The chrominance signal is fed into the asymmetrical input (pin 11) of the ACC-stage (Automatic Colour Control). The input has to be AC coupled and has an input impedance of 20 kΩ in parallel with 10 pF. To control the chrominance amplitude the modulation independent burst amplitude is measured during the burstkey pulse which is derived from the sandcastle pulse present at pin 24. The generated error current is fed into an external storage capacitor at pin 12. The integrated error voltage controls the gain of the ACC stage so that its output is independent of input signal variations. The measurement is disabled during the vertical blanking to avoid failures because of missing burst signals. Demodulation The demodulation of the colour signal requires two demodulators. One is common for PAL and NTSC signals, the other is for SECAM signals. The PAL/NTSC demodulator consists of two synchronized demodulators, one for the (B−Y) Channel and the other for the (R−Y) Channel. The required reference signals (fSC) are input fr.


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