用于地震监测和能源开发的具有 PGA 的超高分辨率 Σ-Δ ADC - ADS1282

ADS1282 (正在供货)

用于地震监测和能源开发的具有 PGA 的超高分辨率 Σ-Δ ADC

 

描述

The ADS1282 is an extremely high-performance, single-chip analog-to-digital converter (ADC) with an integrated, low-noise programmable gain amplifier (PGA) and two-channel input multiplexer (mux). The ADS1282 is suitable for the demanding needs of energy exploration and seismic monitoring environments.

The converter uses a fourth-order, inherently stable, delta-sigma (ΔΣ) modulator that provides outstanding noise and linearity performance. The modulator is used either in conjunction with the on-chip digital filter, or can be bypassed for use with post processing filters.

The flexible input MUX provides an additional external input for measurement, as well as internal self-test connections. The PGA features outstanding low noise (5 nV/√Hz) and high input impedance, allowing easy interfacing to geophones and hydrophones over a wide range of gains.

The digital filter provides selectable data rates from 250 to 4000 samples per second (SPS). The high-pass filter (HPF) features an adjustable corner frequency. On-chip gain and offset scaling registers support system calibration.

The synchronization input (SYNC) can be used to synchronize the conversions of multiple ADS1282s. The SYNC input also accepts a clock input for continuous alignment of conversions from an external source.

Together, the amplifier, modulator, and filter dissipate 25 mW. The ADS1282 is available in a compact TSSOP-28 package and is fully specified from –40°C to +85°C, with a maximum operating range to +125°C.

特性

  • High Resolution:
    130-dB SNR (250 SPS)
  • High Accuracy:
    THD: –122 dB
    INL: 0.5 ppm
  • Low-Noise PGA
  • Two-Channel Input Mux
  • Inherently-Stable Modulator with Fast Responding
    Overrange Detection
  • Flexible Digital Filter:
    Sinc + FIR + IIR (Selectable)
    Linear or Minimum Phase Response
    Programmable High-Pass Filter
    Selectable FIR Data Rates: 250 SPS
    to 4 kSPS
  • Filter Bypass Option
  • Low Power Consumption: 25 mW
    Shutdown: 10 µW
  • Offset and Gain Calibration Engine
  • SYNC Input
  • Analog Supply:
    Unipolar (+5 V) or Bipolar (±2.5 V)
  • Digital Supply: 1.8 V to 3.3 V

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参数 与其它产品相比 精密 ADCs (<=10MSPS)

 
Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Input Type
Power Consumption (Typ) (mW)
Interface
Features
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Architecture
Operating Temperature Range (C)
Pin/Package
THD (Typ) (dB)
SNR (dB)
Reference Mode
ADS1282 ADS1281 ADS1287 ADS1287D
31    31    24    24   
4kSPS    4kSPS    1kSPS    1 kSPS   
1    1    1    2   
Differential    Differential    Differential    Differential   
25    12    4.5    4.4   
Serial    Serial    SPI    SPI   
PGA      PGA    PGA   
-2.5
0   
-2.5
0   
-2.5
0   
-2.5
0   
2.5
5   
2.5
5   
2.5
5   
2.5
5   
Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma   
-40 to 85    -40 to 85    -40 to 85    -40 to 85   
28TSSOP    24TSSOP    24VQFN    32VQFN   
-122    -122    -115    -115   
130    130    116    114   
Ext    Ext    Ext    Ext   

其它合格版本 ADS1282

版本 器件型号 定义
高温 ADS1282-HT 用于严苛环境下的高温产品
宇航 ADS1282-SP 抗辐射、陶瓷封装,适用于太空应用

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