BurrBrown Products

from Texas Instruments

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

SBAS373 – OCTOBER 2007

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

234

• Synchronously Sample Four/Eight Channels

• Selectable Operating Modes:

The ADS1174 (quad) and ADS1178 (octal) are

multiple delta-sigma (

ΔΣ) analog-to-digital converters

High-Speed: 52kSPS Data Rate, 30mW/ch

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

Low-Power: 10kSPS Data Rate, 8mW/ch

(SPS), which allow synchronous sampling of four and

• AC Performance:

eight

channels.

These

devices

use

identical

25kHz Bandwidth

packages, permitting drop-in expandability.

97dB SNR

The delta-sigma architecture offers near ideal 16-bit

–105dB THD

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

• Digital Filter:

linearity) combined with 0.005dB passband ripple,

Linear Phase Response

and linear phase response.

Passband Ripple: ±0.005dB

The

high-order,

chopper-

stabilized

modulator

Stop Band Attenuation: 100dB

achieves very low drift (4

μV/

°C offset, 4ppm/°C gain)

• Selectable SPI™ or Frame Sync Serial

Interface

response

(FIR)

filter

provides

a

usable

signal

• Simple Pin-Driven Control

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

of stop band attenuation while suppressing modulator

• Low Sampling Aperture Error

and signal out-of-band noise.

• Specified from –40°C to +105°C

Two operating modes allow for optimization of speed

• Analog Supply: 5V

and power: High-speed mode (32mW/Ch at 52kSPS),

• I/O Supply: 1.8V to 3.3V

and Low-power mode (8mW/Ch at 10kSPS).

• Digital Core Supply: 1.8V

A

SYNC

input

control

pin

allows

the

device

conversions to be started and synchronized to an

external event. SPI and Frame-Sync serial interfaces

• 3-Phase Power Monitors

are supported. The device is fully specified over the

extended industrial range (–40

°C to +105°C) and is

• Defibrillators and ECG Monitors

available in an HTQFP-64 PowerPAD™ package.

• 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.

PRODUCT PREVIEW information concerns products in the

Copyright © 2007, Texas Instruments Incorporated

formative or design phase of development. Characteristic data and

other specifications are design goals. Texas Instruments reserves

the right to change or discontinue these products without notice.