Datasheet

Output
Output
Time(100 s/div)m
5V/div
+18V
-18V
37V
PP
SineWave
( 18.5V)±
OPA171
OPA171-Q1
www.ti.com SBOS556A –JUNE 2011–REVISED SEPTEMBER 2012
APPLICATION INFORMATION
The OPA171-Q1 operational amplifier provides high This device can operate with full rail-to-rail input
overall performance, making it ideal for many 100mV beyond the top rail, but with reduced
general-purpose applications. The excellent offset performance within 2V of the top rail. The typical
drift of only 2µV/°C provides excellent stability over performance in this range is summarized in Table 2.
the entire temperature range. In addition, the device
offers very good overall performance with high
PHASE-REVERSAL PROTECTION
CMRR, PSRR, and A
OL
. As with all amplifiers,
The OPA171-Q1 has an internal phase-reversal
applications with noisy or high-impedance power
protection. Many op amps exhibit a phase reversal
supplies require decoupling capacitors close to the
when the input is driven beyond its linear common-
device pins. In most cases, 0.1µF capacitors are
mode range. This condition is most often encountered
adequate.
in noninverting circuits when the input is driven
beyond the specified common-mode voltage range,
OPERATING CHARACTERISTICS
causing the output to reverse into the opposite rail.
The OPA171-Q1 is specified for operation from 2.7V The input of the OPAx171 prevents phase reversal
to 36V (±1.35V to ±18V). Many of the specifications with excessive common-mode voltage. Instead, the
apply from –40°C to +125°C. Parameters that can output limits into the appropriate rail. This
exhibit significant variance with regard to operating performance is shown in Figure 37.
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.
COMMON-MODE VOLTAGE RANGE
The input common-mode voltage range of the
Figure 37. No Phase Reversal
OPAx171 series extends 100mV below the negative
rail and within 2V of the top rail for normal operation.
Table 2. Typical Performance Range
PARAMETER MIN TYP MAX UNIT
Input Common-Mode Voltage (V+) – 2 (V+) + 0.1 V
Offset voltage 7 mV
vs Temperature 12 µV/°C
Common-mode rejection 65 dB
Open-loop gain 60 dB
GBW 0.7 MHz
Slew rate 0.7 V/µs
Noise at f = 1kHz 30 nV/√Hz
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Product Folder Links: OPA171-Q1