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| OPA369 Datasheet, PDF (12/20 Pages) Burr-Brown (TI) – 1.8V, 1μA max, Zerø-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER | |||
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OPA369
OPA2369
SBOS414A â AUGUST 2007 â REVISED SEPTEMBER 2007
R3
R2
+2.7V
OPA369
VIN
R1
66.5W
C1
1.5nF
REF3312
C2
1mF
+2.7V
VCC
MSP430x20x3PW
A0+
16-Bit
ADC
VREF
VSS
Figure 29. Unipolar Signal Chain Configuration
www.ti.com
RG
RSHUNT
zener(1)
R1(2)
10kW
V+
OPA369
MOSFET rated to
stand-off supply voltage
such as BSS84 for
up to 50V.
+5V
V+
Two zener
biasing methods
are shown.(3)
Load
RBIAS
Output
RL
NOTES: (1) Zener rated for op amp supply capability (that is, 5.1V for OPA369).
(2) Current-limiting resistor.
(3) Choose zener biasing resistor or dual NMOSFETs (FDG6301N, NTJD4001N, or Si1034)
Figure 30. High-Side Current Monitor
Load
V
ILOAD
RSHUNT
1W
R1
4.99kW
R3
4.99kW
+5V
R2
49.9kW
OPA369
R4
48.7kW
3V
REF3130
R6
71.5kW
RN
56W
ADS1100
RN
I2C
56W
Stray Ground-Loop Resistance
R7
1.18kW
(PGA Gain = 4)
FS = 3.0V
NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors.
Figure 31. Low-Side Current Monitor
12
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): OPA369 OPA2369
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