Multimedia ICs
3-channel 75Ω driver
BA7660FS
The BA7660FS is a 75Ω driver with a 6dB amplifier and three internal circuits, and provides 75Ω drive of composite
Y signals and C signals, as well as RGB signals. Each load is capable of driving two circuits, and a sag correction
function reduces the capacitance of the output coupling capacitor.
The input voltage is within a range of 0V to 1.5V, enabling direct connection of ordinary D / A converter output. An
internal power-saving circuit is also included which provides simultaneous muting on all three channels, and output
pin shorting protection.
•
Applications boxes and other digital video devices
DVDs, set top
•
Featurescoupled directly to D / A converter output.
1) Can be
2) Operates at a low power consumption (115mW typ.).
3) Internal output muting circuit.
4) Internal power-saving circuit.
5) Internal output protection circuit.
6) An internal sag correction function makes it possible
to reduce the capacitance of the output coupling
capacitor.
7) Each load is capable of driving two circuits.
8) The compact 16-pin SSOP-A package is used.
•
Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Symbol
Vcc
Pd
Topr
Tstg
Limits
8
650
– 25 ~ + 75
– 55 ~ + 125
Unit
V
mW
°C
°C
•
Recommended operating conditions (Ta = 25°C)
Parameter
Operating power supply voltage
Symbol
Vcc
Min.
4.5
Typ.
5.0
Max.
5.5
Unit
V
1
Multimedia ICs
BA7660FS
•
Block diagram
MUTE 1
16 V
CC
15 OUTA1
INA
2
6dB
75Ω
GND
3
14 OUTA2
INB
4
6dB
75Ω
13 OUTB1
GND
5
12 OUTB2
N.C.
6
11 N.C.
INC
7
6dB
75Ω
10 OUTC1
MUTE (1pin)
H
3ch MUTE
NORMAL
GND
8
9 OUTC2
L
2
Multimedia ICs
BA7660FS
•
Pin descriptions and input / output circuits
Pin. No
Pin name
IN
OUT
Reference
voltage
Equivalent circuit
Function
Muting control
1
MUTE
K
—
—
15k
8k
If MUTE (pin 1) is set to HIGH, muting
is carried out simultaneously on all
three channels.
Signal input
2
4
7
INA
INB
INC
Input
video
RGB,
within
(typ.).
signals consist of composite
signals, Y signals, C signals,
and others. The input level is
a range of 0 to 1.3 (min.) to 1.5
K
—
—
3
5
8
GND
—
—
0V
GND
Ground
14
12
9
15
13
10
OUTA2
OUTB2
OUTC2
—
OUTA1
OUTB1
OUTC1
K
0.9V
14pin
12pin
9pin
Signal output
The signal output level is (0.9 + 2
×
input voltage [V]). Pins 9, 12, and 14
are the pins for sag correction. If pins
10, 13, and 15 are set to 0.2V or less,
the protective circuit is triggered and
the power-saving mode is accessed.
0.95V
15pin
13pin
10pin
Vcc
16
V
CC
—
—
5.0V
Power supply
3
Multimedia ICs
BA7660FS
CC
•
Electrical characteristics (unless otherwise noted, Ta = 25°C, V
Parameter
Circuit current
Maximum output level
Voltage gain
Frequency characteristic
Muting attenuation
Muting switching level HIGH
Muting switching level LOW
Symbol
I
CC
Vom
G
V
G
f
M
T
V
THH
V
THL
Min.
11.4
2.6
5.5
– 1.0
—
3.5
0
Typ.
22.8
3.0
6.0
0.0
– 60
—
—
Max.
34.2
—
6.5
1.0
—
V
CC
1.0
= 5V)
Unit
mA
V
P- P
dB
dB
dB
V
V
With no signal
f = 1kHz,THD = 1%
f = 4.43MHz,1V
P- P
f = 7MHz / 1MHz,1V
P- P
f = 4.43MHz,1V
P- P
—
—
Conditions
•
Guaranteed design parameters (unless otherwise noted, Ta = 25°C, V
Parameter
Differential gain
Differential phase
Interchannel crosstalk
Interchannel voltage gain
differential
Symbol
DG
DP
C
T
∆G
V
Min.
—
—
—
– 0.5
Typ.
0.5
0.5
– 60
0.0
Max.
1.5
1.5
– 55
0.5
%
dB
dB
CC
= 5V)
Conditions
1.0V
P- P
reference staircase signal
1.0V
P- P
reference staircase signal
f = 4.43MHz,1V
P- P
f = 4.43MHz,1V
P- P
Unit
deg
•
Measurement circuit
3.3V
1
2
1.2V
3
1µF
1
1µF
430k
2
75k
1
SW4
1µF
430k
2
75k
4
6dB
75Ω
13
75Ω
22µF
5
12
V
SW2
2
6dB
75Ω
15
22µF
3
14
100µF
1
16
SW1
SW16 1
2
0.1µF
100µF
75Ω
V
47µF
A
V
CC
1µF
1µF
1
N.C.
SW7
6
11
N.C.
100µF
1µF
430k
2
75k
7
6dB
75Ω
10
75Ω
22µF
V
9
8
4
Multimedia ICs
BA7660FS
•
Measurement condition settings table
Item
Circuit current
Maximum
output level
OUTA
OUTB
OUTC
OUTA
Voltage gain
OUTB
OUTC
Frequency
characteristics
OUTA
OUTB
OUTC
OUTA→OUTB
OUTA→OUTC
Crosstalk between
channels
OUTB→OUTA
OUTB→OUTC
OUTC→OUTA
OUTC→OUTB
OUTA
Muting attenuation
OUTB
OUTC
Symbol
SW
1
I
CC
V
OM1
V
OM2
V
OM3
G
V1
G
V2
G
V3
G
F1
G
F2
G
F3
C
T1
C
T2
C
T3
C
T4
C
T5
C
T6
M
T1
M
T2
M
T3
2
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
1
1
1
SW
2
1
2
1
1
2
1
1
2
1
1
2
2
1
1
1
1
2
1
1
Switch conditions
SW
4
1
1
2
1
1
2
1
1
2
1
1
1
2
2
1
1
1
2
1
SW
7
1
1
1
2
1
1
2
1
1
2
1
1
1
1
2
2
1
1
2
SW
16
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Note 6
Note 5
Note 4
Note 3
Note 2
Measurement
method
Note 1
∗
The muting switching level is substituted by carrying out the above measurement at High = 3.3V, Low = 1.2V.
Note 1: Measure the circuit current when no signal is present.
Note 2: Apply a sine wave of f = 1kHz to the input, and adjust the input
level so that the output distortion is 1%. At this time, set the out-
put voltage to the maximum output level of V
OM
[V
P-P
].
Note 3: Measure the output V
O
[V
P-P
] with a sine wave of f = 4.43MHz,
1V
P-P
applied to the input. Voltage gain G
V
is:
G
V
= 20 Log (V
O
/ V
IN
) [dB]
Note 4: Measure the outputs V
O
7 and V
O
1 [V
P-P
] each with sine waves of
f = 7MHz, 1V
P-P
and f = 1MHz, 1V
P-P
applied to the input. Voltage
frequency G
F
is:
G
F
= 20 Log (V
O7
/ V
O1
) [dB]
Note 5: Measure the output V
O
[V
P-P
] with a sine wave of f = 4.43MHz,
1V
P-P
applied to the input. Interchannel crosstalk C
T
is:
C
T
= 20 Log (V
O
/ V
IN
) [dB]
Note 6: Measure the output V
O
[V
P-P
] with a sine wave of f = 4.43MHz,
1V
P-P
applied to the input. The muting attenuation M
T
is:
M
T
= 20
∗
Log (V
O
/ V
IN
) [dB]
5
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