Standard ICs
Dual operational amplifier
BA728 / BA728F / BA728N
The BA728, BA728F, and BA728N are ICs with two independently functioning operational amplifiers featuring inter-
nal phase compensation. These products offer a wide range of operating voltages, from 3 to 18V ( ± 1.5 to 9V) and
are high-performance operational amplifiers which can be driven from a single power supply within the in-phase
mode input range, including a negative power supply.
•
Applications small-signal amplifiers
Ground sensing
Control amplifiers requiring high phase margin, such as motor drivers
Amplifiers operated on low voltages
Capacitive loaded amplifiers
•
Featuresdriven from a single power supply.
1) Can be
2) Low power.
3) Pin layout is the same as that of the general-
purpose 4558 operational amplifier.
4) When driven from a single power supply, the power
supply voltage ranges from 3 to 18V.
5) When driven from a dual power supply, the power
supply voltage ranges from ± 1.5 to ± 9V.
6) Output is protected against short-circuits.
7) Output block is operated as a class AB to mini-
mize crossover distortion.
8) Low input bias current of 10nA (typ.).
9) Each package contains two operational amplifiers.
10) Internal phase compensation provided.
•
Block diagram
BA728 / BA728F
OUT1
1
8
V
CC
–
IN1
+
IN1
2
–
3
1ch
7
OUT2
+
+
2ch
–
6
–
IN2
V
EE
4
5
+
IN2
BA728N
+
+
2ch
1ch
–
–
1
2
3
4
5
6
7
OUT1
OUT2
+
IN1
+
IN2
–
IN1
–
IN2
V
CC
V
EE
8
1
Standard ICs
BA728 / BA728F / BA728N
•
Internal circuit configuration
OUT
V
CC
Q
13
Q
6
Q
16
R
5
Q
18
Q
19
Q
24
Q
27
Q
29
Q
15
R
1
R
2
Q
17
R
3
Q
23
Q
10
Q
1
Q
4
Q
5
Q
9
Q
11
Q
12
Q
21
Q
14
Q
22
Q
26
V
EE
R
6
Q
20
Q
28
R
4
Q
25
C
1
Q
3
Q
7
+
IN
–
IN
Q
2
Q
8
•
Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
Power dissipation
Differential input voltage
Common-mode input voltage
Operating temperature
Storage temperature
Symbol
V
CC
Pd
V
ID
V
I
Topr
Tstg
Limits
BA728
18 (
±
9)
800
∗
V
CC
BA728F
18 (
±
9)
550
∗
V
CC
BA728N
18 (
±
9)
550
∗
V
CC
Unit
V
mW
V
V
°C
°C
– 0.3 ~ + V
CC
– 0.3 ~ + V
CC
– 0.3 ~ + V
CC
– 20 ~ + 75
– 55 ~ + 125
– 20 ~ + 75
– 55 ~ + 125
– 20 ~ + 75
– 55 ~ + 125
∗
Refer to Pd characteristics diagram.
∗
The values for the BA728Fare those when it is mounted on a glass epoxy PCB (50mm
×
50mm
×
1.6mm).
•
Electrical characteristics (unless otherwise noted, Ta = 25°C, V
Parameter
Input offset voltage
Input offset current
Input bias current
High-amplitude voltage gain
Common-mode input voltage
Maximum output voltage
Common mode rejection ratio
Power supply voltage rejection ratio
Slew rate
Maximum frequency
Channel separation
source
Maximum output current
sink
Symbol
V
IO
I
IO
I
B
A
V
V
ICM
V
OM
CMRR
PSRR
S. R.
f
T
CS
Isource
Isink
Min.
—
—
—
86
±
3.0
70
—
—
—
—
—
—
Typ.
2
1
10
100
±
4.5
90
30
0.7
0.7
120
20
10
CC
= + 6V, V
EE
= - 6V)
Unit
mV
nA
nA
dB
V
V
dB
µV
/ V
V /
µ
S
MHz
dB
mA
mA
V
IN+
= 1V, V
IN–
= 0V
V
IN–
= 1V, V
IN+
= 0V
A
V
= 1, R
L
= 2kΩ
R
L
2kΩ
R
L
2kΩ
Conditions
Max.
10
50
250
—
—
—
—
150
—
—
—
—
—
4 ~ – 6 4.5 ~ – 6
2
Standard ICs
BA728 / BA728F / BA728N
•
Measurement circuits
I
C
V
CC
50kΩ
10kΩ
10kΩ
V
O
2
Channel separation
1
V
O
2
=
– 200 log 1000 · V
O
1
~
–
200
Ω
V
S
R
S
1Ω
R
S
BA728
BA728F
BA728N
–
R
L
50Ω
1ch
+
2ch
+
V
O
1
(indicates individual channels
in the same package)
(per circuit)
V
EE
Fig. 1 Channel separation measurement circuit
•
Electrical characteristic curves
1200
POWER DISSIPATION: Pd (mW)
QUIESCENT CURRENT: l
Q
(mA)
3
INPUT BIAS CURRENT: l
d
(nA)
30
1000 BA728N
800
BA728
600
2
20
400 BA728F
200
0
0
25
50
75
100
125
150
AMBIENT TEMPERATURE: Ta (°C)
1
10
0
0
10
POWER SUPPLY VOLTAGE: V + (V)
20
0
10
POWER SUPPLY VOLTAGE: V + (V)
20
Fig.2 Power dissipation vs. ambient
temperature
Fig.3 Quiescent current vs.
power supply voltage
Fig.4 Input bias current vs.
power supply voltage
160
OPEN LOOP VOLTAGE GAIN: A
V
(dB)
40
OPEN LOOP VOLTAGE GAIN: A
V
(dB)
0
20
40
60
80
120
OUTPUT CURRENT: l
O
(mA)
100
30
80
120
20
60
40
20
10
80
0
10
POWER SUPPLY VOLTAGE: V + (V)
20
0
– 20
0
1
10
100
1k
10k
100k
1M
10M
AMBIENT TEMPERATURE: Ta (°C)
FREQUENCY: f (Hz)
Fig.5 Open loop voltage gain vs.
power supply voltage
Fig.6 Current control characteristics
Fig.7 Open loop voltage gain vs.
frequency
3
Standard ICs
BA728 / BA728F / BA728N
•
Electrical characteristic curve
20
MAXIMUM OUTPUT VOLTAGE: V
OM
(W)
OUTPUT VOLTAGE
V
OUT
(V)
4
3
2
1
0
3
2
1
0
0
10
20
TIME (µs)
30
40
MAXIMUM OUTPUT VOLTAGE: V
OM
(V)
10
15
5
10
0
5
INPUT VOLTAGE
V
IN
(V)
–5
0
100
1k
10k
100k
1M
– 10
0
±
5
POWER SUPPLY VOLTAGE: V
±
(V)
±
10
FREQUENCY: f (Hz)
Fig.8 Maximum output voltage vs.
frequency
Fig.9 Output response characteristics
Fig.10 Maximum output voltage vs.
power supply voltage
notes
•
Operationcircuit connections
(1)Unused
If there are any circuits which are not being used, we
recommend making connections as shown in Figure
11, with the non-inverted input pin connected to the
potential within the in-phase input voltage range (V
ICM
).
–
To potential
in V
ICM
V
CC
+
V
EE
Fig.11 Unused circuit connections
•
External dimensions (Units: mm)
BA728
9.3
±
0.3
6.5
±
0.3
8
5
BA728F
5.0
±
0.2
8
6.2
±
0.3
4.4
±
0.2
5
BA728N
19.3
±
0.2
10.5
±
0.5
5.8
±
0.2
2.8
±
0.2
0.15
±
0.1
1
0.51Min.
4
7.62
1.2
1
3.5
±
0.5
2.54
8
0.6
0.8
1.3
0.3
±
0.1
3.2
±
0.2 3.4
±
0.3
1.5
±
0.1
1
4
0.3
±
0.1
0.11
1.27
0.4
±
0.1
0.3Min.
0.15
2.54
0.5
±
0.1 0° ~ 15°
DIP8
SOP8
SIP8
4
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