+15V
9
V
IN , up to
± 10V Swing
7
ISO
VOUT
122P
8
10
2
16
1
–15
+5V
Regulator
MC78L05
–5V
Regulator
MC79L05
0.1µF
0.1µF
1
3
3
2
1
2
0.33µF 0.33µF
4
PWS740–3
To PWS740–2,–1
NOTE: The input supplies can be subregulated to ±5V to reduce
PSR related errors without reducing the ±10V input range.
FIGURE 10. Improved PSR Using External Regulator.
VS1 (+15V)
7
VS
(V)
INPUT RANGE
(V)(1)
INA105
Difference Amp
20+
15
12
–2 to +10
–2 to +5
–2 to +2
2
5
10kΩ
+VS2 (+15V)
R1
R2
1
6
1
15
16
In
9
ISO
ISO
ISO
7
VOUT = VIN
122P
122
122P
(1)
8
R3
R4
RC
Signal Source
VIN
3
Gnd
2
10
RS
Com 2
+
4
–VS1
Reference
IN4689
5.1V
–VS2 (–15V)
NOTE: Since the amplifier is unity gain, the input
range is also the output range. The output can go to
–2VsincetheoutputsectionoftheISOampoperates
from dual supplies.
NOTE: (1) Select to match RS .
FIGURE 11. Single Supply Operation of the ISO122P Isolation Amplifier. For additional information see AB-009.
®
ISO122
12
TI [ TEXAS INSTRUMENTS ]
