OPA4364-Q1 Datasheet, PDF (13/21 Pages) Texas Instruments – 1.8-V, 7-MHz, 90-dB CMRR, SINGLE-SUPPLY, RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER

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OPA2364-Q1, OPA4364-Q1
SGLS363A – JUNE 2006 – REVISED OCTOBER 2006
APPLICATION INFORMATION (continued)
V+ = 5 V
OPAx364
V_OUT
V_IN
500 µA
R_P = 10 kΩ
Negative
Supply
Grounded
–V = –5 V
(Additional Negative Supply)
Figure 24. Swing to Ground
This technique does not work with all operational amplifiers. The output stage of the OPAx364 allows the output
voltage to be pulled below that of most operational amplifiers, if approximately 500 µA is maintained through the
output stage. To calculate the appropriate value load resistor and negative supply, R_L = –V/500 µA. The
OPAx364 has been characterized to perform well under the described conditions, maintaining excellent
accuracy down to 0 V and as low as –10 mV. Limiting and nonlinearity occurs below –10 mV, with linearity
returning as the output is again driven above –10 mV.
Buffered Reference Voltage
Many single-supply applications require a mid-supply reference voltage. The OPAx364 offer excellent capacitive
load drive capability and can be configured to provide a 0.9-V reference voltage (see Figure 25). For appropriate
loading considerations, see the Capacitive Load section.
V+
V+
0.9 V
R1
10 kΩ
R2
10 kΩ
OPAx364
C_L = 1 µF
Figure 25. OPAx364 Provides a Stable Reference Voltage
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