OPA1612-Q1_15 Datasheet, PDF (18/31 Pages) Texas Instruments – OPA1612-Q1 SoundPlus High-Performance, Bipolar-Input Audio Operational Amplifier

OPA1612-Q1
SLOS931A – NOVEMBER 2015 – REVISED NOVEMBER 2015
9 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The OPA1612-Q1 device is unity-gain stable, precision op amp with very low noise; these devices are also free
from output phase reversal. Applications with noisy or high-impedance power supplies require decoupling
capacitors close to the device power-supply pins. In most cases, 0.1-μF capacitors are adequate.
9.2 Typical Application
Figure 37 shows how to use the OPA1612-Q1 device as an amplifier for professional audio headphones. The
circuit shows the left side stereo channel. An identical circuit is used to drive the right side stereo channel.
820 Ω
2200 pF
I_OUTL+
Audio DAC
with Differential
Current
Outputs
+V_A
(15 V)
0.1 µF
Device
–V_A
(–15 V)
0.1 µF
820 Ω
2200 pF
+V_A
(15 V)
0.1 µF
680 Ω
330 Ω
620 Ω
2700 pF
+V_A
(15 V)
0.1 µF
8200 pF
680 Ω
620 Ω
Device
–V_A
(–15 V)
0.1 µF
100 Ω
L Ch
Output
I_OUTL–
Device
–V_A
(–15 V)
0.1 µF
330 Ω
2700 pF
Figure 37. Audio DAC Post Filter (I/V Converter and Low-Pass Filter)
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