ADS1174

ADS1178

1

FEATURES

DESCRIPTION

APPLICATIONS

VREFP VREFN AVDD

DVDD

TEST[1:0]

FORMAT[2:0]

CLK

SYNC

PWDN[8:1]

CLKDIV

Control

Logic

SPI

and

Frame-

Sync

Interface

IOVDD

DGND

AGND

DRDY/FSYNC

SCLK

DOUT[8:1]

DIN

Input2

Input1

Input4

Input3

Input6

Input5

Input8

Input7

DS

DS

DS

DS

DS

DS

DS

DS

PWDN[4:1]

ADS1178

Four

Digital

Filters

AVDD

DVDD

TEST[1:0]

FORMAT[2:0]

CLK

SYNC

CLKDIV

Control

Logic

SPI

and

Frame-

Sync

Interface

IOVDD

DGND

AGND

DRDY/FSYNC

SCLK

DOUT[4:1]

DIN

ADS1174

MODE

MODE

Eight

Digital

Filters

VREFP VREFN

Input2

Input1

Input4

Input3

DS

DS

DS

DS

ADS1174

ADS1178

Quad/Octal, Simultaneous Sampling, 16-Bit Analog-to-Digital Converters

234

• Simultaneously Sample Four/Eight Channels

The ADS1174 (quad) and ADS1178 (octal) are

multiple delta-sigma (

ΔΣ) analog-to-digital converters

• Selectable Operating Modes:

(ADCs) with data rates up to 52k samples-per-second

High-Speed: 52kSPS Data Rate, 31mW/ch

(SPS), which allow synchronous sampling of four and

Low-Power: 10kSPS Data Rate, 7mW/ch

eight

channels.

These

devices

use

identical

• AC Performance:

packages,

and

are

also

compatible

with

the

25kHz Bandwidth

high-performance 24-bit ADS1274 and ADS1278,

97dB SNR

permitting drop-in upgrades.

–105dB THD

The delta-sigma architecture offers near ideal 16-bit

• DC Performance:

ac performance (97dB SNR, –105dB THD, 1LSB

2

µV/°C Offset Drift

linearity) combined with 0.005dB passband ripple and

2ppm/°C Gain Drift

linear phase response.

• Digital Filter:

The

high-order,

chopper-stabilized

modulator

Linear Phase Response

achieves very low drift (2

µV/°C offset, 2ppm/°C gain)

Passband Ripple: ±0.005dB

Stop Band Attenuation: 100dB

response

(FIR)

filter

provides

a

usable

signal

bandwidth up to 90% of the Nyquist rate with 100dB

• Selectable SPI™ or Frame Sync Serial

of stop band attenuation while suppressing modulator

Interface

and signal out-of-band noise.

• Simple Pin-Driven Control

Two operating modes allow for optimization of speed

• Low Sampling Aperture Error

and power: High-speed mode (31mW/Ch at 52kSPS),

• Specified from –40°C to +105°C

and Low-power mode (7mW/Ch at 10kSPS).

• Analog Supply: 5V

A

SYNC

input

control

pin

allows

the

device

• I/O Supply: 1.8V to 3.3V

conversions to be started and synchronized to an

• Digital Core Supply: 1.8V

external event. SPI and Frame-Sync serial interfaces

are supported. The device is fully specified over the

extended industrial range (–40°C to +105°C) and is

available in an HTQFP-64 PowerPAD™ package.

• 3-Phase Power Monitors

• Defibrillators and ECG Monitors

• Coriolis Flow Meters

• Vibration/Modal Analysis

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PowerPAD is a trademark of Texas Instruments.

3

SPI is a trademark of Motorola, Inc.

4

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.