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OPA2836 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
OPA2836 Very-Low-Power, Rail-to-Rail Out, Negative Rail In, Voltage-Feedback Operational Amplifiers TI
Texas Instruments TI
OPA2836 Datasheet PDF : 59 Pages
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OPA836, OPA2836
SLOS712I – JANUARY 2011 – REVISED OCTOBER 2016
www.ti.com
Typical Applications (continued)
9.2.1.1 Design Requirements
Design a low distortion, single-ended input to single-ended output audio amplifier using the OPA836 device. The
2700-series audio analyzer from Audio Precision is used as the signal source and also as the measurement
system.
CONFIGURATION
OPA836 Unity Gain Config.
Table 6. Design Requirements
INPUT
EXCITATION
PERFORMANCE
TARGET
1 KHz Tone Frequency
>110 dBc SFDR
RLoad
300 Ω and
100 kΩ
9.2.1.2 Detailed Design Procedure
The OPA836 device is tested in this application in a unity-gain buffer configuration. A buffer configuration is
selected for maximum loop gain of the amplifier circuit. At higher closed-loop gains, the loop gain of the circuit
reduces, which increases the harmonic distortion. The relationship between distortion and closed-loop gain at a
fixed input frequency is shown in Figure 36 in Typical Performance Graphs: VS = 5 V. The test was performed
under using resistive loads of 300 Ω and 100 KΩ. Figure 34 shows the distortion performance of the amplifier
versus the resistive load. Output loading, output swing, and closed-loop gain play a key role in determining the
distortion performance of the amplifier.
NOTE
The 100-pF capacitor to ground on the input helped to decouple noise pickup in the lab
and improved noise performance.
The Audio Precision was configured as a single-ended output in this application circuit. In applications where a
differential output is available, the OPA836 device can be configured as a differential-to-single-ended amplifier as
shown in Figure 67. Power-supply bypassing is critical to reject noise from the power supplies. A 2.2-μF supply
decoupling capacitor must be placed within 2 inches of the device and can be shared with other operational
amplifiers on the same board. A 0.1-μF supply decoupling capacitor must be placed as close to the supply pins
as possible, preferably within 0.1 inch. For a split supply, a capacitor is required for both supplies. A 0.1-µF
capacitor placed directly between the supplies is also beneficial for improving system noise performance. If the
output load is heavy, such as 16 Ω to 32 Ω, performance of the amplifier could begin to degrade. To drive such
heavy loads, both channels of the OPA2836 device can be paralleled with their outputs isolated with 1-Ω
resistors to reduce the loading effects.
38
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