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Part: BA7652AF
Category:
Multimedia
Description:
Company: ROHM Electronics
Datasheet: Download BA7652AF datasheet File size : 124 kB
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Datasheet text preview:
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]. pp cations ·iAeolicassette recorders and camcorders Vd a ·)FSemturlesclamp capacitors can be used (ceramic, 1 al 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.).
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) 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 5.0mW for each increase in Ta of 1°C over 25°C.
·Recommended operating conditions (Ta = 25°C)
Parameter Recommended operating voltage Symbol VCC Limits 4.0 ~ 7.0 Unit V
1
Multimedia ICs
BA7652AF
·Block diagram
IN1 1 8 GND
CTLa
2
7
OUT
IN2
3 Logic
6
VCC
CTLb
4
5
IN3
·Pin descriptions
Pin No. 1 2 3 4 5 6 7 8 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 MUTE
·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 VTH = VCC VF × 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
BA7652AF
·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 50µA
VCC
2.3V
2
CTLa
--
--
50k CTLa
1.9V
VCC
3
IN 2
1.65V
10M or more
IN2 100 50µA
VCC 50µA
2.3V
4
CTLb
--
--
50k CTLb
1.9V
3
Multimedia ICs
DC voltage (VCC = 5V) Input / output impedance
BA7652AF
Pin No.
Pin name
Equivalent circuit
Vcc
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
BA7652AF
·Application examples
C.Video IN 0.01µF IN1 1 8 GND
Logic
CTLa
2
7
OUT
C.Video OUT VCC
C.Video IN 0.01µF
IN2
3
6
VCC
+
47µF CTLb LOGIC IN3 0.01µF
0.1µF
Logic
4
5
C.Video IN
When superimposition is used
C.Video IN 0.01µF
IN1
1
8
GND
C.Video or DC OUT Logic CTLa 2 7 OUT
VCC IN2 VCC
+
3
6
DC1.7V or more CTLb LOGIC IN3
47µF
0.1µF
Logic
4
5
DC1.7V or more
Fig. 1
tion notes ·Opeoraensure stable clamp operation, the output (1) T 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 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
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