INA2126E Burr-Brown Corporation, INA2126E Datasheet - Page 9

• Manufacturer Part Number: INA2126E
• Description: MicroPOWER INSTRUMENTATION AMPLIFIER Single and Dual Versions
• Manufacturer: Burr-Brown Corporation

FIGURE 4. Bridge Signal Acquisition—Single 5V Supply.
FIGURE 5. Differential Voltage-to-Current Converter.
A similar instrumentation amplifier, INA125, provides
an internal reference voltage for sensor excitation
and/or A/D converter reference.
Sensor
Bridge
2.5V + V
2.5V – V
A
OPA177
OPA130
OPA602
OPA129
1
R
G
3
8
1
2
I
B
1.5nA
100fA
20pA
Error
1pA
10k
INA126
A
A
+5V
1
2
4
7
40k
10k
40k
V
–
+
IN
9
6
5
The ADS7817’s V
conversion rate 10kS/s or slower assures enough current to turn on the
reference diode. Converter input range is ±1.2V. Output swing limitation of
INA126 limits the A/D converter to somewhat greater than 11 bits of range.
1.2V
R
G
6 8
INA126
4
1k
1k
0.47µF
R
R
1
33µA
2
Dual version has external sense connection.
C
REF1004C-1.2
Ref
1
R
340Hz LP
REF
1
, C
input current is proportional to conversion rate. A
1
, R
2
3
1
2
:
INA126, INA2126
+IN
–IN
V
A
REF
1
ADS7817
sense connection. Pin numbers
shown are for single version.
12-Bit
Dual version has external
A/D
R
1
8
4
C
Ck
I
D
INA126 and ADS7817
are available in fine-pitch
MSOP-8 package
B
S
6
5
7
Load
I
O
Select
Serial
Clock
=
Data
Chip
V
R
IN
1
I
• G
O
®