DRV134 Datasheet, PDF (11/30 Pages) Burr-Brown (TI) – AUDIO BALANCED LINE DRIVERS

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8 Detailed Description
DRV134, DRV135
SBOS094B – JANUARY 1998 – REVISED DECEMBER 2014
8.1 Overview
The DRV134 and DRV135 consist of an input inverter driving a cross- coupled differential output stage with 50 Ω
series output resistors. Characterized by low differential-mode output impedance (50 Ω) and high common-mode
output impedance (1.6 kΩ), the DRV134 and DRV135 are ideal for audio applications.
Excellent internal design and layout techniques provide low signal distortion, high output level (27 dBu), and a
low noise floor (–98 dBu). Laser trimming of thin film resistors assures excellent output common-mode rejection
(OCMR) and signal balance ratio (SBR). In addition, low dc voltage offset reduces errors and minimizes load
currents.
The Functional Block Diagram section shows a detailed block diagram of the DRV134 and DRV135.
8.2 Functional Block Diagram
V–
1µF
V+
1µF
5 (11)
DRV134
DRV135
4
V_IN
(6)
Gnd
3
A1
(5)
6 (12)
50Ω ₈
A2
+V_O
(14)
10kΩ
7
(13) +Sense
G = +6dB
2 –Sense
(4)
50Ω ₁
A3
–V_O
(3)
All resistors 30kΩ unless otherwise indicated.
10kΩ
8.3 Feature Description
8.3.1 Audio Performance
The DRV134 and DRV135 were designed for enhanced ac performance. Very low distortion, low noise, and wide
bandwidth provide superior performance in high quality audio applications. Laser-trimmed matched resistors
provide optimum output common-mode rejection (typically 68dB), especially when compared to circuits
implemented with op amps and discrete precision resistors. In addition, high slew rate (15 V/μs) and fast settling
time (2.5 μs to 0.01%) ensure excellent dynamic response.
The DRV134 and DRV135 have excellent distortion characteristics. As shown in the distortion data provided in
the Typical Characteristics section, THD+Noise is below 0.003% throughout the audio frequency range under
various output conditions. Both differential and single-ended modes of operation are shown. In addition, the
optional 10μF blocking capacitors used to minimize V_OCM errors have virtually no effect on performance.
Measurements were taken with an Audio Precision System One (with the internal 80 kHz noise filter) using the
THD test circuit shown in Figure 24.
Copyright © 1998–2014, Texas Instruments Incorporated
Product Folder Links: DRV134 DRV135
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