Datasheet

INA326, INA327
15
SBOS222D
www.ti.com
FIGURE 15. Programmable ±25µA Current Source with High
Output Resistance.
FIGURE 12. Output Offset Adjustment.
2kΩ
100kΩ1nF
5
V
O
= V
IN
(100) + V
DAC
V
DAC
= 0.075V
to 4.925V
INA326
2
1
8
3
6
DAC
+
−
V
IN
INA326
4
5
7
2
1
8
3
6
R
F
= 10k
NOTE: Output resistance is typically 800MΩ.
Resolution < 5nA. Recommended values of C
F
= 1nF to 1µF.
+5V
C
F
V
REF
= +2.5V
R
1
200kΩ
DAC
I
OUT
=
((+V
REF
) − (V
DAC
))
R
1
± 50nA
0V < V
DAC
< +5V
FIGURE 14. Output from Pin 5 to Allow Swing Beyond the Rail.
INA326
+5V
NC
(1)
V
O
+15V
−15V
OPA277
V
D
C
2
R
2
R
1
V
CM
5
6
7
2
1
8
3
4
4
6
7
2
3
(2)
NOTES: (1) NC denotes No Connection.
(2) Typical swing capability −20mV to (+5V + 100mV).
FIGURE 13. Multiplexed Output.
INA327
4
7
9
6
2
1
10
3
8
R
1
R
3
R
5
+5V
Enable
NOTE: (1) R
2
, R
4
, and R
6
could be a
single, shared resistor to save board space.
INA327
4
7
9
6
2
1
10
3
8
R
4
(1)
R
2
(1)
+5V
Enable
INA327
4
7
9
6
2
1
10
3
8
R
6
(1)
+5V
Enable
+1.8V to +5V
Logic
V
O
1nF
1nF
1nF