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| Multimedia ICs Video signal switcher, 1 x 3-channel with clamped-input BA7653AF The BA7653AF is a video-signal switching IC that contains a three-channel clamped-input multiplexer. 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 0.01F (FZ) ceramic). *Applications recorders, television and camcorders Video cassette *Featuresclamp capacitors can be used (ceramic, 1) Small 3000pF (Min.), 0.01F (FS) (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 (70nsec. Typ.). 4) Low power consumption (when VCC = 5V, 25mW Typ.). 5) Wide dynamic range (3.1VP-P Typ. for VCC = 5V). 6) Excellent frequency characteristics (10MHz, 0dB Typ.). 7) Low interchannel crosstalk ( - 70dB Typ.). 8) Voltage can be applied to the control pins even when VCC is not applied. *Absolute maximum ratings (Ta = 25C) Parameter Applied voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 9 500 - 25 ~ + 75 - 55 ~ + 125 Unit V mW C C When mounted on a 50mm x 50mm board, reduced by 5mW for each increase in Ta of 1C over 25C. *Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Symbol VCC Limits 4.0 ~ 7.0 Unit V 1 Multimedia ICs BA7653AF *Block diagram IN1 1 8 GND CTLa 2 7 OUT IN2 3 6 VCC Logic CTLb 4 5 IN3 *Pin descriptions Pin No. 1 2 3 4 5 6 7 8 Pin name IN1 CTLa IN2 CTLb IN3 VCC OUT GND Input 1 Control input a Input 2 Control input b Input 3 Supply voltage Output GND Function *Control pin truth table CTLa L H L H CTLb L L H H OUT IN1 IN2 IN3 IN3 *Electrical characteristics (unless otherwise noted, Ta = 25C and VCC = 5.0V) Parameter Operating voltage Supply current Maximum output level Voltage gain Interchannel crosstalk Frequency characteristic CTL switching voltage Symbol VCC ICC Vom GV Cta Gf VTH L VTH H Min. 3.7 2.7 2.6 - 0.5 -- - 3.0 -- 2.5 Typ. -- 5.0 3.1 0 - 70 0 -- -- Max. 7.7 8.2 -- 0.5 -- 1.0 1.0 -- Unit V mA VP-P dB dB dB V Conditions -- -- f = 1kHz, THD = 1.0% f = 1MHz, VIN = 1.0VP-P f = 4.43MHz, VIN = 1.0VP-P f = 10MHz / 1MHz, VIN = 1.0VP-P VCC - CTL Threshold Level VCC - VF VTH = x 20 (V) 45 *Guaranteed design parameters (unless otherwise noted, Ta = 25C and VCC = 5.0V) Parameter Differential gain Differential phase Symbol DG DP Min. -- -- Typ. 0 0.5 Max. 0.5 1.0 Unit % deg Conditions VIN = 1.0VP-P, standard staircase signal VIN = 1.0VP-P, standard staircase signal 2 Multimedia ICs BA7653AF *Input / output circuits Pin No. Pin name DC voltage (VCC = 5V) Input / output impedance Equivalent circuit VCC 1 IN 1 1.65V 10M or more IN1 100 50A VCC 2.3V 2 CTLa -- -- 50k CTLa 1.9V VCC 3 IN 2 1.65V 10M or more IN2 100 50A VCC 50A 2.3V 4 CTLb -- -- 50k CTLb 1.9V 3 Multimedia ICs DC voltage (VCC = 5V) Input / output impedance BA7653AF Pin No. Pin name Equivalent circuit VCC 5 IN 3 1.65V 10M or more IN3 100 50A VCC 6 VCC 5.0V -- VCC 7 OUT 0.95V 26 OUT 1mA VCC 8 GND 0V -- GND 4 Multimedia ICs BA7653AF *Application examples C. Video In 0.01 IN1 1 8 GND Logic CTLa 2 7 OUT C. Video Out VCC C. Video In 0.01 IN2 3 6 VCC + 47 CTLb 4 Logic IN3 5 0.01 0.1 Logic C. Video In When superimposition is used C. Video In 0.01 IN1 1 8 GND Logic CTLa 2 7 OUT C. Video or DC Out VCC IN2 3 DC1.7V or more 47 CTLb 4 Logic IN3 5 DC1.7V or more 0.1 6 + VCC Logic Fig. 1 * Operation notes (1) To ensure stable clamp operation, the output impedance of the previous stage connected to the inputs should be 1k 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 0.1F Max. (0.01F (FZ) ceramic capacitor recommended). (3) The BA7653AF 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 unstable, set to H or L. (5) When using superimposition, the DC voltage directly applied to the inputs should be at least 1.7V. 5 Multimedia ICs BA7653AF *External dimensions (Units: mm) 5.0 0.2 8 6.2 0.3 4.4 0.2 5 1.5 0.1 1 4 0.11 1.27 0.4 0.1 0.3Min. 0.15 SOP8 6 0.15 0.1 |
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