1 Features

? Power consumption:

– PGA operation: 5mW (typical)

– Buffer operation: 3mW (typical)

? Dynamic range:

– PGA gain: 1, 500SPS (122dB, typical)

– Buffer operation: 500SPS (122dB, typical)

? THD: < –120dB (typical)

? CMRR: 120dB (typical)

? Flexible digital filter:

– Selectable sinc + FIR + IIR

– Linear or minimum phase

– High-pass filter

? Data rates: 125SPS to 2000SPS

? PGA gains: 1 to 64

? SYNC input

? Clock error compensation

? Two-channel multiplexer

? Offset and gain calibration

? General-purpose digital I/Os

? Analog supply operation: 5V, 3.3V, or ±2.5V

2 Applications

? Energy exploration

? Passive seismic monitoring

? Earth sciences and geology

? Precision instrumentation

3 Description

The ADS1288 is a 32-bit, low-power, analog-todigital

converter (ADC), with a programmable gain

amplifier (PGA) and a finite impulse response (FIR)

filter. The ADC is designed for the demanding

requirements of seismology equipment requiring low

power consumption to extend battery run time.

The low-noise PGA extends the ADC dynamic

range through gains 1 to 64. The PGA allows

direct connection to geophones and transformercoupled

hydrophones without the need of an external

amplifier. The optional unity-gain buffer reduces

power consumption.

The ADC incorporates a high-resolution, delta-sigma

(ΔΣ) modulator and a FIR filter with programmable

phase response. The high-pass filter removes dc

and low-frequency content from the signal. Clock

frequency error is compensated by the sample rate

converter with up to 7ppb frequency accuracy.

The ADC supports 3.3V operation to minimize device

power consumption. Power consumption is 3mW

(typical) in buffer mode operation and 5mW (typical)

in PGA mode operation.

The ADC is available in a compact 5mm × 5mm

VQFN package and is fully specified over the –40°C

to +85°C ambient temperature range.