OPA1632 Datasheet, PDF (13/30 Pages) Texas Instruments – High-Perfomance, Fully-Differential AUDIO OP AMP

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OPA1632
SBOS286C – DECEMBER 2003 – REVISED OCTOBER 2015
8.2 Typical Application
Figure 14 shows the OPA1632 used as a differential-output driver for the PCM1804 high-performance audio
ADC.
V+
+8V to +16V
10mF
+
0.1mF
Balanced or +
Single- Ended
Input -
R₃
270W
C₁
1nF
R₁
1kW
8
3
5
R₂
V_OCM
2 _OPA1632
1kW
1
64
7
C₂
1nF
R₅
40W
R₆
40W
R₄
270W
C₃
2.7nF
1/2
PCM1804
V_COM
(2.5V)
(1)
Enable
0.1mF
10mF
OPA134
1kW
0.1mF
-8V to -16V
V-
Figure 14. ADC Driver for Professional Audio
8.2.1 Design Requirements
Table 1 shows example design parameters and values for the typical application design example in Figure 12.
Table 1. Design Parameters
DESIGN PARAMETERS
Supply voltage
Amplifier topology
Output control
Filter requirement
VALUE
±2.5 V to ±15 V
Voltage feedback
DC coupled with output common
mode control capability
500 kHz, Multiple feedback low pass
filter
8.2.2 Detailed Design Procedure
Supply voltages of ±15 V are commonly used for the OPA1632. The relatively low input voltage swing required
by the ADC allows use of lower power-supply voltage, if desired. Power supplies as low as ±8 V can be used in
this application with excellent performance. This reduces power dissipation and heat rise. Power supplies should
be bypassed with 10-μF tantalum capacitors in parallel with 0.1-μF ceramic capacitors to avoid possible
oscillations and instability.
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