1FEATURES

2? High Speed:

– Data Rate: 2.5MSPS

– Bandwidth: 1.23MHz

? Outstanding Performance:

– SNR: 91dB at f IN = 100kHz, –1dBFS

– THD: –101dB at fIN = 100kHz, –6dBFS

– SFDR: 103dB at fIN = 100kHz, –6dBFS

? Ease-of-Use:

– High-Speed 3-Wire Serial Interface

– Directly Connects to TMS320 DSPs

– On-Chip Digital Filter Simplifies Antialias

Requirements

– Simple Pin-Driven Control—No On-Chip

Registers to Program

– Selectable On-Chip Voltage Reference

– Simultaneous Sampling with Multiple

ADS1602s

? Low Power:

– 530mW at 2.5MSPS

– Power-Down Mode

APPLICATIONS

? Sonar

? Vibration Analysis

? Data Acquisition

DESCRIPTION

The ADS1602 is a high-speed, high-precision,

delta-sigma (ΔΣ) analog-to-digital converter (ADC)

manufactured on an advanced CMOS process. The

ADS1602 oversampling topology reduces clock jitter

sensitivity during the sampling of high-frequency,

large amplitude signals by a factor of four over that

achieved by Nyquist-rate ADCs. Consequently,

signal-to-noise ratio (SNR) is particularly improved.

Total harmonic distortion (THD) is –101dB, and the

spurious-free dynamic range (SFDR) is 103dB.

Optimized for power and performance, the ADS1602

dissipates only 530mW while providing a full-scale differential input range of ±3V. Having such a wide

input range makes out-of-range signals unlikely. The

OTR pin indicates if an analog input out-of-range

condition does occur. The differential input signal is

measured against the differential reference, which

can be generated internally or supplied externally on

the ADS1602.

The ADS1602 uses an inherently stable advanced

modulator with an on-chip decimation filter. The filter

stop band extends to 38.6MHz, which greatly

simplifies the antialiasing circuitry. The modulator

samples the input signal up to 40MSPS, depending

on fCLK, while the 16x decimation filter uses a series

of four half-band FIR filter stages to provide 75dB of stop band attenuation and 0.001dB of passband

ripple.

Output data is provided over a simple 3-wire serial

interface at rates up to 2.5MSPS, with a –3dB

bandwidth of 1.23MHz. The output data or its

complementary format directly connects to DSPs

such as TI’s TMS320 family, FPGAs, or ASICs. A

dedicated synchronization pin enables simultaneous

sampling with multiple ADS1602s in multi-channel

systems. Power dissipation is set by an external

resistor that allows a reduction in dissipation 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.

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

× 7mm TQFP-48 package and is specified

from –40°C to +85°C.