THS4521 datasheet(48/66 Pages) TI2

Part #	THS4521

Description	THS4541 Negative Rail Input, Rail-to-Rail Output, Precision, 850MHz Fully Differential Amplifier

PDF	66 Pages

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Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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48 / 66 page

9.2.2 Interfacing to High-Performance ADCs

499

R16

6.2

R17

6.2

499

180 pF

33 pF

250 nH

R12

35.7

R13

35.7

0.2 F

R15

442

ADC

Input

ADC

Input

205

Vcc

50-

Source

49.9

1 F

JP1

2-to-1 for

dc-coupled Vin

2-to-3 for

ac-coupled Vin

Vocm

Vcc

FDA

Vcc

10 nF

Vcc

R11

100

0.95 V

ADC Vcm

Output

BAV99

Figure 9-4. DC-Coupled, Bipolar Input Gain of 2 V/V Single-Ended to Differential Interface to ADC

9.2.2.1 Design Requirements

In this example design, an impedance matched input assuming a 50-Ω source is implemented with a dc-coupled

gain of 2 V/V to the ADC. This configuration effectively reduces the required full-scale input to ±0.5 V for a 2-VPP

full-scale input ADC. Add a low insertion-loss interstage filter to the ADC to control the broadband noise where

the goal is to show minimal SNR reduction in the FFT, as well as minimal degradation in SFDR performance.

THS4541

SLOS375B – AUGUST 2014 – REVISED FEBRUARY 2024

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THS4521 Datasheet(PDF) 48 Page - Texas Instruments

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