ROHM BA7664FV Datasheet
1
Multimedia ICs
75Ω driver with Y / C MIX circuit
BA7664FV
The BA7664FV is a 75Ω driver with a 6dB amplifier and a Y / C MIX circuit. The 75Ω driver is capable of driving a
load sufficient for two circuits, as well as being equipped with a sag correction function which reduces the capacitance of the output coupling capacitor. The IC comes in the compact 8-pin SSOP-B package. The composite Y signal input pin is sync chip clamped input, while the chrominance input pin is bias input. An internal power-saving circuit is also included which provides an output muting function and output pin shorting protection.
•
Applications
Video cameras, electronic cameras and others
•
Features
1) The compact 8-pin SSOP-B package is used.
2) Operates at a low power consumption (60mW Typ.).
3) Internal Y / C MIX circuit.
4) Internal output muting circuit.
5) Internal power-saving circuit.
6) Internal output protection circuit.
7) Internal sag correction function makes it possible to
reduce the capacitance of the output coupling
capacitor.
8) A load sufficient for two circuits can be driven.
•
Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Limits Unit
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
V
CC
Pd
T
opr
Tstg
8
350
– 25 ~ + 75
– 55 ~ + 125
V
mW
°C
°C
∗
Reduced by 3.5mW for each increase in Ta of 1°C over 25°C
•
Recommended operating conditions (Ta = 25°C)
Parameter Symbol UnitMax.Typ.Min.
Operating power supply voltage
V
CC 4.5 5.55.0 V
∗
Not designed for radiation resistance.
2
Multimedia ICs BA7664FV
•
Block diagram
+
6dB 75Ω
20k
MUTEA
1
YIN
2
GND
3
CIN
4
VCC
8
OUT1
7
OUT2
6
MUTEB
5
MUTE
CHROMA MUTE
3
Multimedia ICs BA7664FV
•
Pin descriptions and input / output circuits
Pin. No Pin name IN OUT
Reference
potential
Equivalent circuit Pin description
MUTEA
MUTEB
K ——
K — 2.0V
——0V
1
5
2
3
Y
IN
GND
Muting control
If MUTEA (pin 1) is set to HIGH, the
output is muted. If MUTEB (pin 8) is
set to HIGH, only the chrominance
signal is muted. (The Y signal is
output without being muted.)
Signal input
This is the input pin for composite Y
signals, and is sync chip clamped
input.
Ground
15k
14k
GND
↓
4CINK — 2.0V
— K
0.9V
0.95V
6
7
MIXOUT2
MIXOUT1
— — 5.0V8V
CC
Signal input
This is the input pin for chrominance
signals, and is bias-type input. The
input impedance is 20kΩ.
Signal output
These are the Y / C MIX signal output.
Pin 6 is the pin for sag correction. If
pin 7 is set to 0.2V or less, the
protective circuit is triggered and the
power-saving mode is accessed.
Power supply
6pin
20k
7pin
V
CC
↓
Loading...