ADC3541 datasheet(18/68 Pages) TI1

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7 Detailed Description

7.1 Overview

The ADC354x is a low noise, ultra-low power 14-bit high-speed ADC family supporting sampling rates from 10 to

65 Msps. It offers very good DC precision together with IF sampling support which makes it ideally suited for a

wide range of applications. The ADC354x is equipped with an on-chip internal reference option but it also

supports the use of an external, high precision 1.6 V voltage reference or an external 1.2 V reference which is

buffered and gained up internally. Because of the inherent low latency architecture, the digital output result is

available after only one clock cycle. Single ended as well as differential input signaling is supported.

An optional programmable digital down converter enables external anti-alias filter relaxation as well as output

data rate reduction. The digital filter provides a 32-bit programmable NCO and supports both real or complex

decimation.

The ADC354x family uses a SDR or DDR as well as a 2-wire or 1-wire serial CMOS interface to output the data

offering lowest power digital interface together with the flexibility to minimize the number of digital interconnects.

The device is a pin-to-pin compatible family with different speed grades.

The device features and control options can be set up either through pin configurations or via SPI register writes.

7.2 Functional Block Diagram

NCO

Control

AIN

CLK

VREF

ADC

14bit

1.2V REF

REFBUF

Digital Downconverter

0.95V

VCM

DCLKIN

DCLK

FCLK

D0..15

Dig I/F

CMOS

TEMP

Sensor

ADC3541

SBAS840 – JULY 2020

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ADC3541 Datasheet(PDF) 18 Page - Texas Instruments