BA7631

Multimedia ICs Video switch for CANAL-Plus decoder BA7631 / BA7631F The BA7631 and BA7631F are audio-switching ICs for decoders for scrambled pay channels used in France and other countries. The ICs include a five-input multiplexer, a four-input multiplexer and a two-input multiplexer, and allow decoder audio switching to be done with a single IC. When used in combination with the BA7630S common logic control can be used for audio and video switching. •Applications recorders Video cassette •Features 1) All the audio-switching functions required for SECAM CANAL -plus decoder integrated onto one chip. 2) Inputs terminated with 65kΩ resistors. 3) Built-in output buffer. 4) Wide supply voltage range (4.5V to 13.0V). 5) Low total harmonic distortion (0.005% Typ.). 6) Wide dynamic range (3.6Vrms, VCC = 12V). 7) Same control logic as for the BA7630S can be used. •Absolute maximum ratings Parameter Applied voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 13.5 1100∗ (DIP) 500∗ (SOP) – 25 ~ + 70 – 55 ~ + 125 Unit V mV °C °C ∗ Reduced by 11mW (DIP) or 5mW (SOP) for each increase in Ta of 1°C over 25°C. •Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Symbol VCC Limits 4.5 ~ 13.0 Unit V 1 Multimedia ICs BA7631 / BA7631F •Block diagram OUT1 1 BF BF 16 OUT2 CTL4 2 1 2 3 15 CTL5 IN5 3 4 SW2 14 CTL3 VCC 4 1 2 BF 13 OUT3 IN4 5 3 SW1 4 5 12 CTL2 GND2 6 11 IN3 IN1 7 1 2 SW3 10 GND1 CTL1 8 9 IN2 BA7631 2 Multimedia ICs table •Truth SW1 block OUT1 CTL1 L L H H CTL2 L H L H CTL5 L L L L H SELECT IN1 IN2 IN3 MUTE IN5 BA7631 / BA7631F •Pin descriptions Pin No. 1 2 3 4 5 6 7 8 Pin name OUT1 CTL4 IN5 VCC IN4 GND2 IN1 CTL1 IN2 GND1 IN3 CTL2 OUT3 CTL3 CTL5 OUT2 Function Output 1 Control 4 Input 5 Power supply Input 4 GND (GND1 common) Input 1 Control 1 Input 2 GND (GND2 common) Input 3 Control 2 Output 3 Control 3 Control 5 Output 2 ∗ ∗ Don't care ∗ OUT2 SW2 block CTL3 L H L H CTL5 L L H H SELECT IN1 IN3 IN5 IN3 9 10 11 12 13 14 15 16 OUT3 SW3 block CTL4 L H SELECT IN2 IN4 3 Multimedia ICs BA7631 / BA7631F •Input / output circuits VCC Q1 N VCC 1 50 2 8 12 14 15 14k 10k 36k 30k 1.8mA 3, 5, 7, 9, 11 VCC VCC 25 1.8mA 6.0V 13 16 65k 125µA 30µA 100 4 Multimedia ICs BA7631 / BA7631F CC = •Electrical characteristics (unless otherwise noted, Ta = 25°C and V Parameter Recommended operating voltage Circuit current Maximum output level Voltage gain Total harmonic distortion Interchannel crosstalk Input conversion noise voltage CTL switch level Input impedance Not designed for radiation resistance. 12V) Unit V mA Vrms dB % dB µVrms V kΩ Conditions — — f = 1MHz, THD = 0.5% f = 1kHz, VIN = 3.0dBm f = 1kHz, VIN = 3.0dBm f = 10kHz, VIN = 3.0dBm 30kHz LPF, Rg = 2.2kΩ — — Symbol VCC ICC Vom GV THD CTM VMin. VTH ZIN Min. 4.5 — 3.1 – 0.5 — — — 1.0 48.5 Typ. 12.0 14.9 3.6 0 0.005 – 75 20.0 2.0 65 Max. 13.0 24.0 — 0.5 0.1 – 60 40.0 3.0 80.5 •Circuit operationBA7631F make it easy to construct a decoder for the scrambled pay channels. They have been The BA7631 and designed specifically for audio signal decoding. As shown in the application examples in Figs. 1 and 2, there are inputs for TV, VCR, decoder, and AUX, to cover a wide range of applications. When the AUX input is not used, by setting CTL5 to “L”, the system construction becomes the same as that of the BA7630S, and the BA7630S switching logic can be used as is. •Application example To VTR IN CTL4 for SW3 from EXT OUT 22µF + 1 2 3 4 5 6 BF 1 BF 16 15 22µF + To DECODER IN CTL5 for SW2 CTL3 for SW2 To TV IN CTL2 for SW1 from TV OUT 22µF + VCC 47µ 2 3 4 1 2 3 SW1 4 5 1 2 SW3 BF SW2 14 13 12 11 10 9 + 22µF + from VTR OUT 22µF + 22µF + 22µF from VTR TUNER OUT CTL1 for SW1 + 7 8 from DECODER OUT Fig.1 5 Multimedia ICs BA7631 / BA7631F VTR TUNER IN OUT 22µF + 22µF + 22µF + 7 SW1 1 9 2 3 4 11 5 8 CTL1 BF 1 22µF + DECODER IN OUT 22µF + 3 12 CTL2 22µF + 5 14 CTL3 TV IN OUT SW2 1 2 3 4 BF 15 CTL5 22µF + 22µF + 16 (AUX) EXT OUT 1 SW3 BF 2 13 2 CTL4 Fig.2 6 Multimedia ICs BA7631 / BA7631F •Electrical characteristic curves TOTAL HARMONIC DISTORTION (%) 0.100 Max. OUTPUT LEVEL (Vrms) VCC = 12.0 (V) f = 1 (kHz) 5.0 4.0 3.0 0.010 2.0 1.0 VCC = 12.0 (V) f = 1 (kHz) THD = 0.5 (%) 0.001 0 1.0 2.0 3.0 4.0 0 5 10 15 INPUT VOLTAGE: (Vrms) POWER SUPPLY VOLTAGE: (V) Fig. 3 Distortion characteristics Fig. 4 Power supply voltage vs. dynamic range characteristics •External dimensions (Units: mm) BA7631 19.4 ± 0.3 16 9 6.5 ± 0.3 16 6.2 ± 0.3 4.4 ± 0.2 9 BA7631F 10.0 ± 0.2 0.51Min. 1 8 7.62 3.2 ± 0.2 4.25 ± 0.3 1 1.5 ± 0.1 8 0.11 0.3 ± 0.1 1.27 2.54 0.5 ± 0.1 0.4 ± 0.1 0.3Min. 0.15 0° ~ 15° DIP16 SOP16 0.15 ± 0.1 7