Data Sheet
OP400
APPLICATIONS
The OP400 is inherently stable at all gains and is capable of
driving large capacitive loads without oscillating. Nonetheless,
good supply decoupling is highly recommended. Proper supply
decoupling reduces problems caused by supply line noise and
improves the capacitive load-driving capability of the OP400.
Table 6. Gain Bandwidth
Gain
Bandwidth
150 kHz
67 kHz
7.5 kHz
500 Hz
5
10
100
1000
Total supply current can be reduced by connecting the inputs of
an unused amplifier to V−. This turns the amplifier off,
lowering the total supply current.
+
+
V
OUT
1/4
V
IN
DUAL LOW POWER INSTRUMENTATION
AMPLIFIER
OP400A
–
+
–
1/4
OP400A
A dual instrumentation amplifier that consumes less than
33 mW of power per channel is shown in Figure 31. The linear-
ity of the instrumentation amplifier exceeds 16 bits in gains of 5 to
200 and is better than 14 bits in gains from 200 to 1000. CMRR
is above 115 dB (G = 1000). Offset voltage drift is typically
0.4 μV/°C over the military temperature range, which is
comparable to the best monolithic instrumentation amplifiers.
The bandwidth of the low power instrumentation amplifier is
a function of gain and is shown in Table 6.
–
REFERENCE
5kΩ
5kΩ
20kΩ
20kΩ
V
R
OUT
40,000
R
G
G
= 5 +
V
IN
+
+
V
OUT
1/4
OP400A
V
IN
–
+
The output signal is specified with respect to the reference
input, which is normally connected to analog ground. The
reference input can be used to offset the output from −10 V to
+10 V if required.
–
1/4
OP400A
–
REFERENCE
5kΩ
5kΩ
20kΩ
20kΩ
R
G
Figure 31. Dual Low Power Instrumentation Amplifier
Rev. H | Page 11 of 16
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