FEATURES

ADS1625 and ADS1626

+5V

Digital

+3V

Digital I/O +2.7V to +5.25V

APPLICATIONS

DESCRIPTION

The ADS1605 and ADS1606 are high-speed, high-pre-

cision, delta-sigma analog-to-digital converters (ADCs)

with 16-bit resolution. The data rate is 5 mega-samples

per second (MSPS), the bandwidth (−3dB) is 2.45MHz,

and passband ripple is less than

±0.0025dB (to

2.2MHz). Both devices offer the same outstanding per-

formance at these speeds with a signal-to-noise ratio up

to 88dB, total harmonic distortion down to −99dB, and

a spurious-free dynamic range up to 101dB. For even

higher-speed operation, the data rate can be doubled to

10MSPS in 2X mode. The ADS1606 includes an adjust-

able first-in first-out buffer (FIFO) for the output data.

The input signal is measured against a voltage refer-

ence that can be generated on-chip or supplied exter-

nally. The digital output data are provided over a simple

parallel interface that easily connects to digital signal

processors (DSPs). An out-of-range monitor reports

when the input range has been exceeded. The

ADS1605/6 operate from a +5V analog supply (AVDD)

and +3V digital supply (DVDD). The digital I/O supply

(IOVDD) operates from +2.7 to +5.25V, enabling the

digital interface to support a range of logic families. The

analog power dissipation is set by an external resistor

and can be reduced when operating at slower speeds.

A power down mode, activated by a digital I/O pin, shuts

down all circuitry. The ADS1605/6 are offered in a

TQFP-64 package using TI PowerPAD

 technology.

The ADS1605 and ADS1606, along with their 18-bit

counterparts, the ADS1625 and ADS1626, are well

suited for the demanding measurement requirements

of scientific instrumentation, automated test equip-

ment, data acquisition, and medical imaging.

REFEN

FIFO_LEV[2:0]

DOUT[15:0]

OTR

DRDY

RD

2XMODE

CS

CLK

PD

RESET

ADS1606 Only

FIFO

I/O

Interface

Digital

Filter

DS

Modulator

Reference and Bias Circuits

DGND

AGND

AVDD

DVDD

IOVDD

VCAP

RBIAS

VMID

VREFN

VREFP

AINP

AINN

ADS1605

ADS1606

ADS1605

ADS1606

SBAS274H − MARCH 2003 − REVISED MAY 2007

16-Bit, 5MSPS

Analog-to-Digital Converter

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

www.ti.com

Copyright

 2003−2007, Texas Instruments Incorporated

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.

PowerPAD is a trademark of Texas Instruments. All other trademarks are the property of their respective owners.