| Resolution (Bits) | 31 |
| Number of input channels | 2 |
| Sample rate (Max) (kSPS) | 4 |
| Interface type | SPI |
| Architecture | Delta-Sigma |
| Input type | Differential |
| Multi-channel configuration | Multiplexed |
| Rating | Catalog |
| Reference mode | Ext |
| Input range (Max) (V) | 1.15, 3.75 |
| Input range (Min) (V) | -1.9, 0.7 |
| Features | PGA |
| Operating temperature range (C) | -40 to 85 |
| Power consumption (Typ) (mW) | 25 |
| Analog voltage AVDD (Min) (V) | -2.5, 0 |
| SNR (dB) | 130 |
| Analog voltage AVDD (Max) (V) | 2.5, 5 |
| Digital supply (Min) (V) | 1.65 |
| Digital supply (Max) (V) | 3.6 |
- 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
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.