+15V
D1
+15V
V1
R1
1
V1
8
INA110
7
+15V
D2
990kΩ
16
∆VIN
10
6
X200
Overall G = 1
–15V
9
1
∆VIN
VOUT
+15V
3
2
8
INA110
7
V2
R2
12
10
9
D3
D4
10kΩ
X100
V2
VOUT
3
2
6
990kΩ
–15V
–15V
10kΩ
For lower voltage, lower resistor noise:
1 = R2 = 20kΩ, D1 – D4 = FDH300 (1nA leakage)
–15V
R
For higher voltage, higher resistor noise:
1 = R2 = 100kΩ, D1 – D4 = 2N4117A (1pA leakage)
Common-mode range = ±1000V.
R
CMR is dependent on ratio matching
of external input resistors.
Matching of RCs on inputs will affect CMR, but
can be optimized by trimming R1 or R2.
FIGURE 14. Input-Protected Instrumentation Amplifier.
FIGURE 15. High Common-Mode Voltage Differential
Amplifier.
–15V +15V
+15V
13
1
8
16
13
6
7
8
X10
RG
10
6
15
9
VOUT
INA110
PGA102
∆VIN
3
2
2
7
1
4
3
–15V
CODE
GAIN
TYPICAL 0.01% SETTLING TIME
X10 X100
PGA Gain
Select
00
01
10
10
100
1000
6µs
6µs
12µs
FIGURE 16. Digitally-Controlled Fast-Settling Programmable Gain Instrumentation Amplifier.
+15V
+15V
1
1
13
12
16
11
3
+15V
13
12
16
11
3
8
X10
X100
X200
X500
RG
8
R
R
X10
X100
X200
X500
RG
10
6
10
6
9
INA110
9
∆VIN
INA110
2N2222A
7
2
1kΩ
7
2
+
∆VOUT
–
–15V
–15V
IOUT
1
13
12
16
11
3
8
X10
X100
X200
X500
RG
RL
10
6
9
∆VIN
INA110
IOUT = (∆VIN) (G) (1/10k + 1/R)
For 0mA to 20mA output, R = 50.25Ω with (∆VIN) (G) = 1V
7
2
FIGURE 17. Differential Input FET Buffered Current
Source.
FIGURE 18. Differential Input/Differential Output
Amplifier.
INA110
12
SBOS147A
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