ADS9217 datasheet(19/68 Pages) TI2

19 / 68 page

7 Detailed Description

7.1 Overview

The ADS911x is an 18-bit, 20MSPS analog-to-digital converter (ADC). The ADS911x integrates a high-

impedance buffer at the ADC inputs, voltage reference, reference buffer, and common-mode voltage output

buffer. The ADS9119 supports unipolar differential analog input signals. The buffer at the ADC inputs is

optimized for low-distortion and low-power operation.

For DC level shifting of the analog input signals, the device has a common-mode voltage output buffer. The

common-mode voltage is derived from the output of the integrated reference buffer. When a conversion is

initiated, the differential input between the (AINAP – AINAM) pins is sampled. The ADS911x uses a clock input

on the SMPL_CLKP pin to initiate conversions.

The ADS911x consumes only 274mW of power when operating at 20MSPS. This value includes the buffer

power dissipation at the ADC inputs. The serial LVDS (SLVDS) digital interface simplifies board layout, timing,

firmware, and supports full throughput at lower clock speeds.

7.2 Functional Block Diagram

SAR

ADC

SMPL_CLK

REFIO

AINP

AINM

VCMOUT

DOUT

DCLK

VDD_1V8

AVDD_5V

SCLK

SDI

SDO

Configuration Registers

Serial

LVDS

Data

Interface

FCLK

GND

4.096V

NCO

Temperature

Sensor

Mixer

2.4V

www.ti.com

ADS9117, ADS9118, ADS9119

SLVSIN3 – MAY 2025

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ADS9217 Datasheet(PDF) 19 Page - Texas Instruments

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