OPA1688 Datasheet, PDF (24/41 Pages) Texas Instruments – OPA168x SoundPlus 36-V, Single-Supply, 10-MHz, Rail-to-Rail Output Operational Amplifiers

OPA1688, OPA1689
SBOS724 – SEPTEMBER 2015
10 Applications 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.
10.1 Application Information
The OPA168x family of amplifiers is specified for operation from 4.5 V to 36 V (±2.25 V to ±18 V). Many of the
specifications apply from –40°C to 85°C. Parameters that can exhibit significant variance with regard to operating
voltage or temperature are presented in the Typical Characteristics.
10.2 Typical Application
This application example highlights only a few of the circuits where the OPA168x can be used.
C₁
47pF
R_OUT
V_AC
R₁
768
V_DC
V_AC
R₃
R_OUT
768
R₂
750
-5 V
-
+ ⁺ _OPA1688
5V
Headphone
Output
Audio DAC
R₄
750
C₂
47pF
Figure 49. Headphone Amplifier Circuit Configuration for Audio DACs that Output a Differential Voltage
(Single Channel Shown)
10.2.1 Design Requirements
The design requirements are:
• Supply voltage: 10 V (±5 V)
• Headphone loads: 16 Ω to 600 Ω
• THD+N: > 100 dB (1-kHz fundamental, 1 V_RMS in 32 Ω, 22.4-kHz measurement bandwidth)
• Output power (before clipping): 50 mW into 32 Ω
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