Texas Instruments ADS1602 16-Bit, 2.5 MSPS Analog-to-Digital Converter User's Manual and Data Sheet

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ADS1602

SBAS341B − DECEMBER 2004 − REVISED APRIL 2005

16-Bit, 2.5MSPS Analog-to-Digital Converter

FEATURES DESCRIPTION

High Speed: The ADS1602 is a high-speed, high-precision, delta-sigma analog-to-digital converter (ADC)

Data Rate: 2.5MSPS

manufactured on an advanced CMOS process. The

Bandwidth: 1.23MHz

ADS1602 oversampling topology reduces clock jitter

Outstanding Performance:

sensitivity during the sampling of high-frequency, large

SNR: 91d B at f IN = 100k Hz, −1d BFS

amplitude signals by a factor of four over that achieved by

THD: −101d B at f IN = 100k Hz, −6d BFS

Nyquist-rate ADCs. Consequently, signal-to-noise ratio

SFDR: 103d B at f IN = 100k Hz, −6d BFS

(SNR) is particularly improved. Total harmonic distortion

Ease-of-Use: (THD) is −101d B, and the spurious-free dynamic range High-Speed 3-Wire Serial Interface (SFDR) is 103d B. Directly Connects to TMS320 DSPs

Optimized for power and performance, the ADS1602

On-Chip Digital Filter Simplifies Anti-Alias

dissipates only 530m W while providing a full-scale

Requirements

differential input range of ±3V. Having such a wide input

Simple Pin-Driven Control—No On-Chip

range makes out-of-range signals unlikely. The OTR pin

Registers to Program

indicates if an analog input out-of-range condition does

Selectable On-Chip Voltage Reference

occur. The differential input signal is measured against the

Simultaneous Sampling with Multiple differential reference, which can be generated internally or ADS1602s supplied externally on the ADS1602. Low Power:

The ADS1602 uses an inherently stable advanced

530m W at 2.5MSPS modulator with an on-chip decimation filter. The filter stop Power-Down Mode band extends to 38.6MHz, which greatly simplifies the

anti-aliasing circuitry. The modulator samples the input APPLICATIONS signal up to 40MSPS, depending on f CLK, while the 16x decimation filter uses a series of four half-band FIR filter

Sonar

stages to provide 75d B of stop band attenuation and

Vibration Analysis

0.001d B of passband ripple.

Data Acquisition

Output data is provided over a simple 3-wire serial interface at rates up to 2.5MSPS, with a −3d B bandwidth of 1.23MHz. The output data or its complementary format

VREFP VREFN RBIASVMID VCAP AVDD DVDD IOVDD

directly connects to DSPs such as TI’s TMS320 family,

SYNC FPGAs, or ASICs. A dedicated synchronization pin

Reference and Bias Circuits

FSO enables simultaneous sampling with multiple ADS1602s FSO

in multi-channel systems. Power dissipation is set by an

AINP Serial external resistor that allows a reduction in dissipation

∆Σ SCLK

Phase Interface Linear

AINN Modulator FIR Digital Filter DOUT when operating at slower speeds. All of the ADS1602

features are controlled by dedicated I/O pins, which

simplify operation by eliminating the need for on-chip

registers.

REFENADS1602

DGNDAGND The high performing, easy-to-use ADS1602 is especially suitable for demanding measurement applications in sonar, vibration analysis, and data acquisition. The ADS1602 is offered in a small, 7mm x 7mm TQFP-48 package and is specified from −40°C to +85°C.

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. All other trademarks are the property of their respective owners.

Copyright  2004−2005, Texas Instruments Incorporated

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