OPA2192 datasheet(28/61 Pages) TI2

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±15.0

±14.0

11.0

12.0

13.0

14.0

15.0

Common-Mode Voltage (V)

200

100

±100

±200

±300

Input Offset Voltage vs Vcm

without e-Trim Input

Transition

Region

P-Channel

Region

N-Channel

Region

±15.0

±14.0

11.0

12.0

13.0

14.0

15.0

Common-Mode Voltage (V)

200

100

±100

±200

±300

Transition

Region

P-Channel

Region

N-Channel

Region

OPA192 e-Trim

Input Offset Voltage vs Vcm

NCH3

PCH2

PCH1

IS1

NCH4

-Vsupply

+Vsupply

VIN+

VIN-

FUSE BANK

VOS TRIM

VOS DRIFT TRIM

e-Trim

OPA192, OPA2192, OPA4192

SBOS620E – DECEMBER 2013 – REVISED NOVEMBER 2015

www.ti.com

8.3.6 Common-Mode Voltage Range

The OPAx192 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 wide range is achieved with paralleled complementary N-channel

and P-channel differential input pairs, as shown in Figure 63. 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.

Figure 63. Rail-to-Rail Input Stage

To achieve the best performance for two-stage rail-to-rail input amplifiers, avoid the transition region when

possible. The OPAx192 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 64.

Figure 64. Common-Mode Transition vs Standard Rail-to-Rail Amplifiers

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OPA2192 Datasheet(PDF) 28 Page - Texas Instruments

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