ADC3561 datasheet(28/85 Pages) TI

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8 Detailed Description

8.1 Overview

The ADC356x is a low noise, ultra-low power 16-bit high-speed single channel ADC supporting sampling rates

up 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 ADC356x 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 1.2V reference which is

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

available after only one to two clock cycles. 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. An internal mux enables dual band complex decimation with independent NCO frequency

tuning. The digital filter provides a 32-bit programmable NCO and supports both real or complex decimation.

The ADC356x family uses a serial LVDS (SLVDS) interface to output the data which minimizes the number

of digital interconnects. The device supports a two-lane (2-wire), a one-lane (1-wire) and a half-lane (1/2-wire)

option. The ADC356x includes a digital output formatter which supports output resolutions from 14 to 20-bit.

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

8.2 Functional Block Diagram

NCO

Control

AIN

CLK

VREF

ADC

16bit

1.2V REF

REFBUF

Digital Downconverter

NCO

0.95V

VCM

Dig I/F

SLVDS

Crosspoint

Switch

DCLKIN

DCLK

FCLK

DA0/1

DB0/1

ADC3561, ADC3562, ADC3563

SBAS990B – FEBRUARY 2021 – REVISED OCTOBER 2022

www.ti.com

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