OPA1692 Datasheet, PDF (9/23 Pages) Texas Instruments – Low-Power, Low-Noise and Low-Distortion Audio Operational Amplifiers

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7 Detailed Description
OPA1692, OPA1694
SBOS566 – JUNE 2017
7.1 Overview
The OPA169x amplifiers are unity-gain stable, dual and quad op amps with very low noise. The Functional Block
Diagram shows a simplified schematic of the OPA169x (one channel shown). The device consists of a very low
noise input stage with a folded cascode and a rail-to-rail output stage. A proprietary distortion reduction
technology allows the OPA169x family of amplifiers to achieve significantly lower distortion than other op amps
that consume the equal or greater power supply current.
7.2 Functional Block Diagram
V+
IN-
IN+
Pre-Driver and
Distortion
Cancellation
OUT
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V-
7.3 Feature Description
7.3.1 Distortion Reduction
Amplifiers employ feedback to reduce the amount of distortion they introduce to the signal path. Increasing the
amount of feedback available for distortion reduction typically requires an increase in the power supply current of
the amplifier. This is not acceptable in low-power amplifiers targeting applications requiring low distortion.
0.1
-60
Competitor A
Competitor B
0.01
Competitor C
-80
OPA1692
0.001
-100
0.0001
-120
0.00001
10
100
1k
Frequency (Hz)
-140
10k
C001
Figure 8. Comparison of THD+N vs Frequency for several low-power amplifiers
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Product Folder Links: OPA1692 OPA1694
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