OPA171-Q1 Datasheet, PDF (11/18 Pages) Texas Instruments – 36V, SINGLE-SUPPLY, GENERAL-PURPOSE OPERATIONAL AMPLIFIER

OPA171-Q1
www.ti.com
APPLICATION INFORMATION
SBOS556 – JUNE 2011
The OPA171-Q1 operational amplifier provides high
overall performance, making it ideal for many
general-purpose applications. The excellent offset
drift of only 2µV/°C provides excellent stability over
the entire temperature range. In addition, the device
offers very good overall performance with high
CMRR, PSRR, and A_OL. As with all amplifiers,
applications with noisy or high-impedance power
supplies require decoupling capacitors close to the
device pins. In most cases, 0.1µF capacitors are
adequate.
OPERATING CHARACTERISTICS
The OPA171-Q1 is specified for operation from 2.7V
to 36V (±1.35V to ±18V). Many of the specifications
apply from –40°C to +125°C. Parameters that can
exhibit significant variance with regard to operating
voltage or temperature are presented in the Typical
Characteristics.
GENERAL LAYOUT GUIDELINES
For best operational performance of the device, good
printed circuit board (PCB) layout practices are
recommended. Low-loss, 0.1µF bypass capacitors
should be connected between each supply pin and
ground, placed as close to the device as possible. A
single bypass capacitor from V+ to ground is
applicable to single-supply applications.
This device can operate with full rail-to-rail input
100mV beyond the top rail, but with reduced
performance within 2V of the top rail. The typical
performance in this range is summarized in Table 2.
PHASE-REVERSAL PROTECTION
The OPA171-Q1 has an internal phase-reversal
protection. Many op amps exhibit a phase reversal
when the input is driven beyond its linear
common-mode range. This condition is most often
encountered in noninverting circuits when the input is
driven beyond the specified common-mode voltage
range, causing the output to reverse into the opposite
rail. The input of the OPAx171 prevents phase
reversal with excessive common-mode voltage.
Instead, the output limits into the appropriate rail. This
performance is shown in Figure 37.
Output
+18V
OPA171
-18V
37VPP
Sine Wave
(±18.5V)
Output
COMMON-MODE VOLTAGE RANGE
The input common-mode voltage range of the
OPAx171 series extends 100mV below the negative
rail and within 2V of the top rail for normal operation.
Time (100ms/div)
Figure 37. No Phase Reversal
PARAMETER
Input Common-Mode Voltage
Offset voltage
vs Temperature
Common-mode rejection
Open-loop gain
GBW
Slew rate
Noise at f = 1kHz
Table 2. Typical Performance Range
MIN
TYP
(V+) – 2
7
12
65
60
0.7
0.7
30
MAX
(V+) + 0.1
UNIT
V
mV
µV/°C
dB
dB
MHz
V/µs
nV/√Hz
Copyright © 2011, Texas Instruments Incorporated
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