Datasheet

10
®
INA143, INA2143
SIMILAR COMPLETE
A
1
, A
2
FEATURE BURR-BROWN IA
OPA2227 Low Noise INA103
OPA129 Ultra Low Bias Current (fA) INA116
OPA2277 Low Offset Drift, Low Noise INA114, INA128
OPA2130 Low Power, FET-Input (pA) INA121
OPA2234 Single Supply, Precision, Low Power INA122, INA118
OPA2237 Single Supply, Low Power, MSOP-8 INA122, INA126
The INA143 can be combined with op amps to form a complete instrumenta-
tion amplifier with specialized performance characteristics. Burr-Brown offers
many complete high performance IAs. Products with related performances
are shown at the right in the table below.
FIGURE 9. Precision G = 11 Buffer.
FIGURE 4. Difference Amplifier with Gain and CMR Adjust.
FIGURE 5. Precision G = –10 Inverting Amplifier.
This circuit follows an 11/1 divider with a gain of 11 for an overall gain of unity.
With an 11/1 divider, the input signal can exceed 55V without damage as
long as input current is less than 0.5mA.
FIGURE 6. Voltage Follower with Input Protection.
FIGURE 7. Precision Instrumentation Amplifier.
FIGURE 8. Precision Summing Amplifier.
10Ω
10Ω 10kΩ 100kΩ
10kΩ 100kΩ
200Ω
200Ω
V
1
V
2
2
3
5
1
6
V
O
Gain
Adjust
CMR
Adjust
INA143
To eliminate adjustment interactions,
first adjust gain with V
2
grounded.
V
2
25
6
INA143
3
V
O
= –10 • V
2
1
Gain Error = 0.05% maximum
Nonlinearity = 0.001% maximum
Gain Drift = 1ppm/°C
10kΩ 100kΩ
10kΩ 100kΩ
25
6
INA143
3
R
3
10kΩ
V
O
= V
IN
V
IN
R
1
10kΩ
R
4
100kΩ
1
R
2
100kΩ
±55V
Without
Damage
V
1
–In
2
3
5
10kΩ 100kΩ
10kΩ 100kΩ
1
6
INA143
V
0
= 10 (1 + 2R
2
/R
1
) (V
2
– V
1
)
A
2
A
1
V
2
+In
R
1
R
2
V
O
R
2
25
6
INA143
V
1
R
1
10kΩ
R
4
100kΩ
1
R
2
100kΩ
R
3
10kΩ
3
V
3
V
O
= V
1
+ 10 • V
3
10kΩ 100kΩ
5
6
INA143
V
O
= 11 • V
IN
1
2
100kΩ
10kΩ
V
IN
3
Gain Error =
0.05% maximum