OPA1652_16 Datasheet, PDF (14/42 Pages) Texas Instruments – Audio Operational Amplifiers

OPA1652, OPA1654
SBOS477A – DECEMBER 2011 – REVISED AUGUST 2016
7 Detailed Description
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7.1 Overview
The OPA1652 and OPA1654 are unity-gain stable, precision dual and quad op amps with very low noise. The
Functional Block Diagram shows a simplified schematic of the OPA165x (one channel shown). The device
consists of a very low noise input stage with a folded cascode and a rail-to-rail output stage. This topology
exhibits superior noise and distortion performance across a wide range of supply voltages not previously
delivered by audio operational amplifiers.
7.2 Functional Block Diagram
V+
V_IN+
V_IN-
Tail
Current
V_BIAS1
Class AB
Control
V_O
Circuitry
V_BIAS2
V-
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7.3 Feature Description
7.3.1 Phase Reversal Protection
The OPA165x family has internal phase-reversal protection. Many op amps exhibit phase reversal when the
input is driven beyond the 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 OPA165x prevents phase reversal with excessive common-mode
voltage. Instead, the appropriate rail limits the output voltage. This performance is shown in Figure 35.
20
+18 V
15
OPA1652
10
-18 V
37VPP
5
Sine Wave
(±18.5 V)
0
G = +1 V/V
−5
−10
−15
V_IN
V_OUT
−20
Time (125 ms/div)
G034
Figure 35. Output Waveform Devoid of Phase Reversal During an Input Overdrive Condition
14
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