ROHM BA7645N Datasheet
1
Multimedia ICs
Video signal switcher
BA7645N
The BA7645N is a four-channel analog multiplexer with mute, designed for use in video cassette recorders. It features a large dynamic range, and wide operating frequency range, and has sync-tip inputs which are ideal for switching video signals.
•
Applications
Video cassette recorders and televisions
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Features
1) 4-input / 1-output switches.
2) Built-in mute.
3) Sync-tip inputs.
4) Wide operating supply voltage range
(4.5V to 13.0V).
5) Low power consumption (48mW Typ.).
6) Excellent frequency characteristics
(10MHz, 0dB Typ.).
7) Wide dynamic range (3.5V
P-P Typ.).
8) Low interchannel crosstalk
( – 65dB Typ., f = 4.43MHz).
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Block diagram
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LOGIC
MUTE
IN1
CTLA
CTLB
IN2
CTLC
IN3
IN4
GND
V
CC
VOUT
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Truth table
OUT
L (OPEN) L (OPEN) L (OPEN) IN1
L (OPEN) H L (OPEN) IN2
H L (OPEN) L (OPEN) IN3
H H L (OPEN) IN4
∗∗
H MUTE
CTLA CTLB CTLC
∗
Either "L (open)" or "H".
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Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol Limit Unit
13.5 V
850
∗
mW
Topr °C
Tstg °C
V
CC
Pd
– 25 ~ + 75
– 55 ~ + 125
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
∗
Reduced by 8.5mW for each increase in Ta of 1°C over 25°C.
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Multimedia ICs BA7645N
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Equivalent circuits
0.8µA 100µA
Vcc
IN
D2
Q1Q2R2
100
D1
Input bias current 1µA [Typ.]
∗
Input clamp voltage 2.1V [VCC = 5V,Typ.]
∗
CLAMP INPUT
2mA
Vcc
Q1
D1
OUT
D2
Output impedance 20Ω [Typ.]
∗
Output DC voltage 0.55V [VCC = 5V, Typ.]
∗
OUTPUT
100 50k
20k
34k
Vcc
CTLA / B
R4
R1D2R2
R3
Q3
CTLA / CTLB
100 45k
30k
29k
Vcc
CTLC
R4
R1D2R2
R3
Q3
CTLC
∗
Reference value
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Electrical characteristics (unless otherwise noted Ta = 25°C and VCC = 5V)
Parameter Symbol Min. Typ. Max. Unit Conditions
V
CC 4.5 — —
—
—
—
—
13.0 V
I
CC — 9.5 14.5 mA
V
om 3.0 3.5 — f = 1kHz, THD = 0.5%
G
V – 0.5 0 + 0.5 dB
C
T – 65 dB
C
f – 3.0 0 + 1.0 dB
V
TH-A 1.0 2.0 3.0 V
V
TH-B 1.0 2.0 3.0 V
V
TH-C 1.0 2.0 3.0 V
——
f = 10MHz / 1MHz,
V
IN = 1.0VP-P
f = 4.43MHz,
V
IN = 1.0VP-P
f = 1MHz, VIN = 1.0VP-P
VP-P
Operating voltage
Supply current
Maximum output level
Voltage gain
Interchannel crosstalk
Frequency characteristics
CTL pin switching level A
CTL pin switching level B
CTL pin switching level C
䊊Not designed for radiation resistance.
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