OPA1655DBVT datasheet(23/42 Pages) TI

Part #	OPA1655DBVT

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

PDF	42 Pages

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Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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8.2.1.3 Application Curves

The deviation from the ideal RIAA transfer function curve is shown in Figure 8-4 and normalized to an ideal gain

of 40 dB at 1 kHz. The measured gain at 1 kHz is 0.05 dB less than the design goal, and the maximum deviation

from 100 Hz to 20 kHz is 0.18 dB. The deviation from the ideal curve can be improved by hand-sorting resistor

and capacitor values to their ideal values. The value of C4 can also be increased to reduce the deviation at low

frequency.

A spectrum of the preamplifier output signal is shown in Figure 8-5 for a 10 mVRMS, 1-kHz input signal (1-VRMS

output). All distortion harmonics are below the preamplifier noise floor.

Frequency (Hz)

-0.5

0.5

1.5

100

10k

D202

Figure 8-4. Measured Deviation

From Ideal RIAA Response

Frequency (Hz)

-160

-150

-140

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

100

10k

D201

Figure 8-5. Output Spectrum for a 10-mVRMS,

‑kHz Input Signal

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OPA1655, OPA1656

SBOS901C – MARCH 2019 – REVISED SEPTEMBER 2022

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OPA1655DBVT Datasheet(PDF) 23 Page - Texas Instruments

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