ADS1285中文資料德州儀器數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

1 Features

? Power-scalable modes (DR at 500 SPS, gain = 1):

– High-power mode: 134-dB DR, 11.5 mW

– Mid-power mode: 134-dB DR, 8.5 mW

– Low-power mode: 131-dB DR, 6.5 mW

? THD: –120 dB

? CMRR: 125 dB

? Data rate: 125 SPS to 4000 SPS

? PGA gain: 1 to 64

? Power-saving buffer mode

? Sample rate converter

? Linear- and minimum-phase digital filter

? Programmable high-pass filter

? Test input channel

? Offset and gain calibration

? General-purpose I/Os

? Analog power supply: 3.3 V or 5 V

? Single or dual power-supply operation

? Reference option: 5 V, 4.096 V, or 2.5 V

2 Applications

? Energy exploration

? Passive seismic monitoring

? Earth sciences

? Precision instrumentation

3 Description

The ADS1285 is a high-resolution, low-power

consumption, analog-to-digital converter (ADC), with

a programmable gain amplifier (PGA) and a finite

impulse response (FIR) filter. The ADC is suitable for

the demanding needs of seismic equipment requiring

precision digitization with long battery run time.

The ADC features a low-noise PGA (6 nV/√Hz)

suitable for direct connection to geophones and

transformer-coupled hydrophones without the need of

external amplifiers.

Power-scalable modes trade-off dynamic range

against power consumption. Optional buffer operation

bypasses the PGA to further reduce power

consumption.

The ADC incorporates a high-resolution, low-drift,

delta-sigma (ΔΣ) modulator and a FIR digital filter with

programmable phase response. The high-pass filter

(HPF) removes dc and low-frequency content from

the signal. The sample rate converter (SRC) corrects

the effect of clock frequency error to within 7-ppb

resolution.

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

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

to +85°C temperature range.