OPA192 Datasheet, PDF (18/35 Pages) Texas Instruments – High Voltage, Rail-to-Rail Input/Output, Precision Operational Amplifiers, e-trim Series

OPA192
OPA2192
OPA4192
SBOS620A – DECEMBER 2013 – REVISED JANUARY 2014
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COMMON-MODE VOLTAGE RANGE
The OPA192 is a 36-V, true rail-to-rail input operational amplifier with an input common-mode range that extends
100 mV beyond either supply rail. This is achieved with paralleled complementary N-channel and P-channel
differential input pairs, as shown in Figure 43. The N-channel pair is active for input voltages close to the positive
rail, typically (V+) – 3 V to 100 mV above the positive supply. The P-channel pair is active for inputs from 100 mV
below the negative supply to approximately (V+) – 1.5 V. There is a small transition region, typically (V+) –3 V to
(V+) – 1.5 V) in which both input pairs are on. This transition region can vary modestly with process variation,
and within this region PSRR, CMRR, offset voltage, offset drift, noise and THD performance may be degraded
compared to operation outside this region.
+Vsupply
IS1
e-Trim^TM
VIN-
PCH1
VIN+
PCH2 ^NCH3
NCH4
FUSE BANK
VOS TRIM VOS DRIFT TRIM
Figure 43. Rail-to-Rail Input Stage
-Vsupply
To achieve the best performance for two-stage rail-to-rail input amplifiers, avoid the transition region when
possible. The OPA192 uses a precision trim for both the N-channel and P-channel regions. This technique
enables significantly lower levels of offset than previous-generation devices, causing variance in the transition
region of the input stages to appear exaggerated relative to offset over the full common-mode range, as shown in
Figure 44.
P-Channel
Region
Transition N-Channel
Region
Region
P-Channel
Region
Transition N-Channel
Region
Region
200
200
100
100
0
0
-100
OPA192 e-Trim
Input Offset Voltage vs Vcm
-100
-200
-300
-15.0 -14.0 ;11.0 12.0 13.0 14.0 15.0
Common Mode Voltage
-200
Input Offset Voltage vs Vcm
without e-Trim Input
-300
-15.0 -14.0 ;11.0 12.0 13.0 14.0 15.0
Common Mode Voltage
Figure 44. Common-Mode Transition vs Standard Rail-to-Rail Amplifiers
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