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Part: BA7653AF
Category:
Multimedia
Description:
Company: ROHM Electronics
Datasheet: Download BA7653AF datasheet File size : 124 kB
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Datasheet text preview:
Multimedia ICs
Video signal switcher, 1 × 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 0.01µF (FZ) ceramic). pp cations ·iAeolicassette recorders, television and camcorders Vd a ·)FSemturlesclamp capacitors can be used (ceramic, 1 al 3000pF (Min.), 0.01µF (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) V o l t a g e can be applied to the control pins even when VCC is not applied.
·Absolute maximum ratings (Ta = 25°C)
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 × 50mm board, reduced by 5mW for each increase in Ta of 1°C over 25°C.
·Recommended operating conditions (Ta = 25°C)
Parameter Power supply voltage Symbol VCC Limits 4.0 ~ 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 = 25°C 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 = × 20 (V) 45
·Guaranteed design parameters (unless otherwise noted, Ta = 25°C 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
VC C
1
IN 1
1.65V
10M or more
IN1 100 50µA
VCC
2.3V
2
CTLa
--
--
50k CTLa
1.9V
VC C
3
IN 2
1.65V
10M or more
IN2 100 50µA
VC C 50µA
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
V CC
5
IN 3
1.65V
10M or more
IN3 100 50µA
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 0.01µ IN1 1 8 GND
Logic
CTLa 2 7
OUT C. Video Out VCC
C. Video In 0.01µ
IN2 3 6
VCC
+
47µ CTLb 4 Logic IN3 5 0.01µ
0.1µ
Logic
C. Video In
When superimposition is used
C. Video In 0.01µ
IN1 1 8
GND
Logic
CTLa 2 7
OUT
C. Video or DC Out
VCC IN2 3 DC1.7V or more 6
+
VCC
47µ Logic IN3 5
0.1µ
Logic
CTLb 4
DC1.7V or more
Fig. 1
·
Operation notes ( 1 ) To ensure stable clamp operation, the output i m p e d a n c e 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 0.1µF Max. (0.01µF (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
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