Datasheet

5V/div
Time(100 s/div)m
+18V
-18V
37V
PP
SineWave
( 18.5V)±
OPA170
OPA170
OPA2170
OPA4170
www.ti.com SBOS557B –AUGUST 2011–REVISED SEPTEMBER 2012
APPLICATION INFORMATION
The OPAx170 family of operational amplifiers This device can operate with full rail-to-rail input
provides high overall performance. These devices are 100mV beyond the positive rail, but with reduced
ideal for many general-purpose applications. The performance within 2V of the positive rail. The typical
excellent offset drift of only 2µV/°C provides excellent performance in this range is summarized in Table 2.
stability over the entire temperature range. In
addition, the device offers very good overall
PHASE-REVERSAL PROTECTION
performance with high CMRR, PSRR, and A
OL
. As
The OPAx170 family has an internal phase-reversal
with all amplifiers, applications with noisy or high-
protection. Many op amps exhibit a phase reversal
impedance power supplies require decoupling
when the input is driven beyond its linear common-
capacitors placed close to the device pins. In most
mode range. This condition is most often encountered
cases, 0.1µF capacitors are 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 OPAx170 family of amplifiers is specified for The input of the OPAx170 prevents phase reversal
operation from 2.7V to 36V (±1.35V to ±18V). Many with excessive common-mode voltage. Instead, the
of the specifications apply from –40°C to +125°C. output limits into the appropriate rail. This
Parameters that can exhibit significant variance with performance is shown in Figure 37.
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.
COMMON-MODE VOLTAGE RANGE
The input common-mode voltage range of the
Figure 37. No Phase Reversal
OPAx170 series extends 100mV below the negative
rail and within 2V of the positive 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
Gain-bandwidth product 0.3 MHz
Slew rate 0.3 V/µs
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Product Folder Links: OPA170 OPA2170 OPA4170