OPA170-EP Datasheet, PDF (11/20 Pages) Texas Instruments – 36-V, SINGLE-SUPPLY, LOW-POWER OPERATIONAL AMPLIFIER

OPA170-EP
www.ti.com
SBOS598A – DECEMBER 2012 – REVISED DECEMBER 2012
APPLICATION INFORMATION
The OPA170 operational amplifier provides high
overall performance. This device is 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 placed close
to the device pins. In most cases, 0.1µF capacitors
are adequate.
OPERATING CHARACTERISTICS
The OPA170 is specified for operation from 2.7V to
36V (±1.35V to ±18V). Many of the specifications
apply from –40°C to +150°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 positive rail, but with reduced
performance within 2V of the positive rail. The typical
performance in this range is summarized in Table 1.
PHASE-REVERSAL PROTECTION
The OPA170 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 OPA170 prevents phase reversal
with excessive common-mode voltage. Instead, the
output limits into the appropriate rail. This
performance is shown in Figure 38.
+18V
OPA170
-18V
37VPP
Sine Wave
(±18.5V)
COMMON-MODE VOLTAGE RANGE
The input common-mode voltage range of the
OPA170 extends 100mV below the negative rail and
within 2V of the positive rail for normal operation.
Time (100ms/div)
Figure 38. No Phase Reversal
PARAMETER
Input Common-Mode Voltage
Offset voltage
vs Temperature
Common-mode rejection
Open-loop gain
Gain-bandwidth product
Slew rate
Table 1. Typical Performance Range
MIN
TYP
(V+) – 2
7
12
65
60
0.3
0.3
MAX
(V+) + 0.1
UNIT
V
mV
µV/°C
dB
dB
MHz
V/µs
Copyright © 2012, Texas Instruments Incorporated
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