ADC3583 datasheet(22/75 Pages) TI

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8 Detailed Description

8.1 Overview

The ADC358x is a low noise, ultra-low power 18-bit high-speed ADC family 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 ADC358x is equipped with an 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 to two clock cycles.

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 internal DDC mux enables use of two decimation filters with independent NCOs for dual band

support (using channel B output interface).

The ADC358x 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

ADC358x 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

1.2V REF

REFBUF

Digital Downconverter

NCO

0.95V

VCM

Dig I/F

SLVDS

Crosspoint

Switch

DCLKIN

DCLK

FCLK

DA0/1

DB0/1

ADC3583

SBAS873 – FEBRUARY 2021

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