Multimedia ICs Video signal swither, 1 × 3-channel with clamped-input BA7652AF The BA7652AF is a video-signal switching IC that contains a three-channel clamped-input multiplexer and a built-in mute circuit. The inputs are sync-tip clamped (synchronous edge of the video input signals are aligned to the same voltage), and as the input impedance is extremely large, it is possible to use a small value for the clamp capacitor. [The recommended capacitor is 0.01µF (FZ) ceramic]. Applications •Video cassette recorders and camcorders •1)Features Small clamp capacitors can be used (ceramic, 5) Wide dynamic range (3.1VP-P Typ. for VCC = 5V). 6) Mute function. 7) Excellent frequency characteristics (10MHz, 0dB Typ.). 8) Low interchannel crosstalk ( – 70dB Typ.). 9) Voltage can be applied to the control pins even when VCC is not applied. 3000pF (Min.), 0.01µF (FZ) (recommended)). 2) Low supply voltage operation possible. Supply voltage range is 3.7V to 7.7V. 3) Superimposition used for fast switching speed with low switching noise (70ns. Typ.). 4) Low power consumption (when VCC = 5V, 25mW Typ.). •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limits Unit Applied voltage VCC 9 V Power dissipation Pd 500∗ mW Operating temperature Topr – 25 ~ + 75 °C Storage temperature Tstg – 55 ~ + 125 °C ∗ When mounted on a 50mm × 50mm board, reduced by 5.0mW for each increase in Ta of 1°C over 25°C. •Recommended operating conditions (Ta = 25°C) Parameter Recommended operating voltage Symbol Limits Unit VCC 4.0 ~ 7.0 V 1 Multimedia ICs BA7652AF •Block diagram IN1 1 8 GND CTLa 2 7 OUT IN2 3 6 VCC Logic CTLb 4 •Control pin truth table •Pin descriptions Pin No. CTLa CTLb OUT Input 1 L L IN1 Control input a H L IN2 Input 2 L H IN3 Control input b H H MUTE Name 1 IN1 2 CTLa Function 3 IN2 4 CTLb 5 IN3 Input 3 6 VCC Supply voltage 7 OUT Output 8 GND GND •Electrical characteristics (unless otherwise noted Ta = 25°C and V CC Parameter = 5.0V) Symbol Min. Typ. Max. Unit Conditions VCC 3.7 — 7.7 V — Supply current ICC 2.7 5.0 8.2 mA — Maximum output level Vom 2.6 3.1 — VP-P f = 1kHz, THD = 1.0% Voltage gain GV – 0.5 0 0.5 dB f = 1MHz, VIN = 1.0VP-P Interchannel crosstalk Cta — — dB f = 4.43MHz, VIN = 1.0VP-P Frequency characteristic Gf – 3.0 0 1.0 dB f = 10MHz / 1MHz, VIN = 1.0VP-P VTH L — — 1.0 VTH H 2.5 — — Operating voltage CTL switching voltage – 70 VCC – CTL Threshold Level V VTH = •Guaranteed design parameters (unless otherwise noted Ta = 25°C and V CC Parameter 2 IN3 5 Symbol Min. Differential gain DG Differential phase DP Unit VCC – VF × 20 (V) 45 = 5.0V) Conditions Typ. Max. — 0 0.5 % VIN = 1.0VP-P standard staircase signal — 0.5 1.0 deg VIN = 1.0VP-P standard staircase signal Multimedia ICs BA7652AF •Input / output circuits Pin No. Pin name DC voltage (VCC = 5V) Input / output impedance Equivalent circuit VCC 1 IN 1 1.65V 10MΩ or more IN1 100 50µA VCC 2.3V 2 CTLa — — 50k CTLa 1.9V VCC 3 IN 2 1.65V 10MΩ or more IN2 100 50µA VCC 2.3V 4 CTLb — — 50µA 50k CTLb 1.9V 3 Multimedia ICs Pin No. Pin name BA7652AF DC voltage (VCC = 5V) Input / output impedance Equivalent circuit Vcc 5 IN 3 1.65V 10MΩ or more IN3 100 50µA Vcc 6 VCC 5.0V — Vcc 7 OUT 0.95V OUT 26Ω 1mA Vcc 8 GND 0V — GND 4 Multimedia ICs BA7652AF •Application examples IN1 C.Video IN 1 8 2 7 GND 0.01µF CTLa Logic OUT C.Video OUT VCC IN2 C.Video IN 3 6 VCC + 0.01µF 47µF CTLb Logic LOGIC 4 5 0.1µF IN3 C.Video IN 0.01µF When superimposition is used IN1 C.Video IN 1 8 2 7 GND 0.01µF C.Video or DC OUT Logic CTLa OUT VCC IN2 3 6 VCC + DC1.7V or more Logic CTLb 47µF LOGIC 4 5 0.1µF IN3 DC1.7V or more Fig. 1 notes •(1)Operation To ensure stable clamp operation, the output impedance of the previous stage connected to the inputs should be 1kΩ or lower. (2) If large input clamp capacitors are used, the time constant of the circuit will mean that some time will be required until stable operation after power is applied. The value for the input clamp capacitors is 0.1µF max. (0.01µF (FZ) ceramic capacitor recommended) . (3) The BA7652AF is a three-channel multiplexer, but two-channel operation is also possible. In this case, if the unused input is left open it will oscillate, but this will not effect the other inputs and cause problems. If this is a concern, ground the unused input via a capacitor, or connect it directly to VCC. (4) If control inputs are left open they will be unstage, set to H or L. (5) When using superimposition, the DV voltage directly applied to the inputs should be at least 1.7V. 5 Multimedia ICs BA7652AF •External dimensions (Units: mm) 1 4 0.11 1.27 0.15 ± 0.1 4.4 ± 0.2 5 1.5 ± 0.1 6.2 ± 0.3 5.0 ± 0.2 8 0.4 ± 0.1 0.3Min. 0.15 SOP8 6