DS

Modulator

AINP

AINN

ADS1675

DVDD

DGND

AGND

AVDD

VREFP VREFN

Dual

Path

Filter

Low-Latency

Filter

Wide-Bandwidth

Filter

CMOSand

LVDS

Compatible

Serial

Interface

DataReady

DataOutput

SerialShiftClock

ChipSelect

InterfaceConfiguration

MasterClock

FilterPath

DataRate

StartConversion

PowerDown

Out-of-Range

Control

CLK

PLL

3x

ADS1675

www.ti.com

SBAS416D – DECEMBER 2008 – REVISED AUGUST 2010

4MSPS, 24-Bit Analog-to-Digital Converter

Check for Samples: ADS1675

1

FEATURES

DESCRIPTION

2

•

AC Performance:

The

ADS1675

is

a

high-speed,

high-precision

103dB of Dynamic Range at 4MSPS

analog-to-digital converter (ADC). Using an advanced

111dB of Dynamic Range at 125kSPS

delta-sigma (

ΔΣ) architecture, it operates at speeds

up to 4MSPS with outstanding ac performance and

–107dB THD

dc accuracy.

•

DC Accuracy:

3ppm INL

The ADS1675 ADC is comprised of a low-drift

4mV/°C Offset Drift

modulator with out-of-range detection and a dual-path

programmable digital filter. The dual filter path allows

4ppm/°C Gain Drift

the user to select between two post-processing filters:

•

Programmable Digital Filter with

Low-Latency or Wide-Bandwidth. The Low-Latency

User-Selectable Path:

filter

settles

quickly

(as

fast

as

2.65ms)

for

–

Low-Latency: Completely settles in 2.65ms

applications with large instantaneous changes, such

as a multiplexer. The Wide-Bandwidth path provides

–

Wide-Bandwidth: 1.7MHz BW with flat

an

optimized

frequency

response

for

ac

passband

measurements with a passband ripple of less than

•

Flexible Read-Only Serial Interface:

±0.00002dB, stop band attenuation of 86dB, and a

–

Standard CMOS

bandwidth of 1.7MHz.

–

Serialized LVDS

The device offers two speed modes with distinct

•

Easy Conversion Control with START Pin

interface,

resolution,

and

feature

set.

In

the

high-speed mode the device can be set to operate at

•

Out-of-Range Detection

either 4MSPS or 2MSPS. In the low-speed mode, it

•

Supply: Analog +5V, Digital +3V

can be set to operate at either 1MSPS, 500KSPS,

•

Power: 575mW

250KSPS or 125KSPS.

The ADS1675 is controlled through I/O pins—there

APPLICATIONS

are no registers to program. A dedicated START pin

•

Automated Test Equipment

allows for direct control of conversions: toggle the

•

Medical Imaging

START pin to begin a conversion, and then retrieve

the output data. The flexible serial interface supports

•

Scientific Instrumentation

data readback with either standard CMOS and LVDS

•

Test and Measurement

logic levels, allowing the ADS1675 to directly connect

to a wide range of microcontrollers, digital signal

processors (DSPs), or field-programmable grid arrays

(FPGAs).

The ADS1675 operates from an analog supply of 5V

and digital supply of 3V, and dissipates 575mW of

power. When not in use, the PDWN pin can be used

to power down all device circuitry. The device is fully

specified over the industrial temperature range and is

offered in a TQFP-64 package.

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

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2010, 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.