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.