OPA1655DBVT datasheet(24/42 Pages) TI

Part #	OPA1655DBVT

Description	OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-Brown™ Audio Operational Amplifiers

PDF	42 Pages

Scroll/Zoom	100%

Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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24 / 42 page

8.2.2 Composite Headphone Amplifier

Figure 8-6 shows the BUF634A buffer inside the feedback loop of the OPA165x to increase the available

output current for low-impedance headphones. If the BUF634A is used in wide-bandwidth mode, no additional

components beyond the feedback resistors are required to maintain loop stability.

500

–

100 F

0.1 F

100 F

OPA165x

BUF634A

12 V

100 k

Output

Input

RBW

Figure 8-6. Composite Headphone Amplifier (Single-Channel Shown)

8.2.2.1 Application Curves

Frequency (Hz)

-110

-105

-100

-95

-90

-85

20 Hz

100 Hz

1 kHz

20 kHz

C051

249 : RL

32 : RL

16 : RL

Figure 8-7. THD+N vs Frequency for a

‑VPP (1.77‑VRMS) Input Signal

Frequency (Hz)

5000

10000

15000

20000

-180

-150

-120

-90

-60

-30

C052

249 : RL

Figure 8-8. FFT for a 5-VPP (1.77-VRMS),

‑kHz Input Signal

OPA1655, OPA1656

SBOS901C – MARCH 2019 – REVISED SEPTEMBER 2022

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OPA1655DBVT Datasheet(PDF) 24 Page - Texas Instruments

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