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OP220GZ Datenblatt(PDF) 8 Page - Analog Devices

Teilenummer OP220GZ
Bauteilbeschribung  Dual Micropower Operational Amplifier
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REV. A
OP220
–8–
OP220
INPUT
OUTPUT
100pF
25k
10
0%
100
90
2 s
20mV
50mV
Figure 2. Small-Signal Transient Response
10
0%
100
90
5V
2V
OP220
INPUT
OUTPUT
CL
100pF
RL
25k
200 s
10k
40k
Figure 3. Large-Signal Transient Response
INSTRUMENTATION AMPLIFIER APPLICATIONS OF
THE OP220
Two Op Amp Configuration
The excellent input characteristics of the OP220 make it ideal for
use in instrumentation amplifier configurations where low-level
differential signals are to be amplified. The low-noise, low input
offsets, low drift, and high gain combined with excellent CMRR
provide the characteristics needed for high-performance instru-
mentation amplifiers. In addition, the power supply current
drain is very low.
The circuit of Figure 4 is recommended for applications where
the common-mode input range is relatively low and differential
gain will be in the range of 10 to 1,000. This two op amp instrumen-
tation amplifier features independent adjustment of common-mode
rejection and differential gain. Input impedance is very high since
both inputs are applied to noninverting op amp inputs.
R4
R3
VO
A2
A1
V1
+
VD
VCM + 1/2 VD
VCM – 1/2 VD
R1
R2
1/2
OP220
1/2
OP220
GAIN
ADJ
R0
V
R
R
R
R
R
R
RR
R
V
R
R
R
R
R
R
V
RR
R
R
V
R
R
V
OD
CM
OD
=+
+
Ê
ËÁ
ˆ
¯˜ +
+
È
Î
Í
˘
˚
˙
+-
Ê
ËÁ
ˆ
¯˜
==
=
=
+
Ê
ËÁ
ˆ
¯˜
4
3
1
1
2
2
1
3
4
23
0
4
3
3
4
2
1
12
3
4
2 1
1
0
If
then
,
Figure 4. Two Op Amp Instrumentation Amplifier
Configuration
The input voltages are represented as a common-mode input
VCM plus a differential input VD. The ratio R3/R4 is made equal
to the ratio R2/R, to reject the common-mode input VCM. The
differential signal VD is then amplified according to:
V
R
R
R
R
RR
R
V
R
R
R
R
O
O
D
=+
+
+
Ê
ËÁ
ˆ
¯˜
=
4
3
1
3
4
23
3
4
2
1
, where
Note that gain can be independently varied by adjusting RO.
From considerations of dynamic range, resistor tempco match-
ing, and matching of amplifier response, it is generally best to
make RX, R2, R3, and R4 approximately equal. Designating
R1, R2, R3, and R4 as RN allows the output equation to be
further simplified:
V
R
R
VR
R
R
R
R
O
N
O
DN
=+
Ê
ËÁ
ˆ
¯˜
==
=
=
21
1
2
3
4
, where
Dynamic range is limited by A1 as well as A2; the output of A1 is:
V
R
R
VV
N
O
DCM
11
2
=- +
Ê
ËÁ
ˆ
¯˜
+
If the instrumentation amplifier were designed for a gain of 10
and maximum VD of
±1 V, then RN/RO would need to be four
and VO would be a maximum of
±10 V. Amplifier A1 would
have a maximum output of
±5 V plus 2 VCM, thus a limit of
±10 V on the output of A1 would imply a limit of ±2.5 V on VCM.
A nominal value of 100 k
W for RN is suitable for most applica-
tions. A range of 200
W to 25 kW for RO will then provide a gain
range of 10 to 1,000. The current through RO is VD/RO, so the
amplifiers must supply
±10 mV/200 W when the gain is at the
maximum value of 1,000 and VD is at
±10 mV.
Rejecting common-mode inputs is most important in accurately
amplifying low-level differential signals. Two factors determine
the CMR of this instrumentation amplifier configuration (assuming
infinite gain):
1. CMRR of the op amps
2. Matching of the resistor network (R3/R4 = R2/R1)


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