ADS1285 Series

32-bit high-resolution two-channel delta-sigma ADC for seismic and geospace exploration

Catalog

32-bit high-resolution two-channel delta-sigma ADC for seismic and geospace exploration

Part	Reference Type	Ratio - S/H:ADC	Operating Temperature [Max]	Operating Temperature [Min]	Sampling Rate (Per Second)	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Configuration	Voltage - Supply, Analog [Max]	Voltage - Supply, Analog [Min]	Number of Bits	Data Interface	Number of Inputs	Number of A/D Converters	Supplier Device Package	Package / Case	Architecture	Mounting Type	Input Type	Input Range	Utilized IC / Part	Supplied Contents	Power (Typ) @ Conditions
Texas Instruments ADS1285IRHBR	External	1:1	85 °C	-40 °C	4k	3.6 V	2.7 V	MUX-PGA-ADC	5.25 V	3 V	32	3-Wire Serial SPI	2	1	32-VQFN (5x5)	32-VFQFN Exposed Pad	Sigma-Delta	Surface Mount	Differential
Texas Instruments ADS1285EVM-PDK					4k						32	I2C SPI		1						±VREF/gain	ADS1285	Board(s)	11.5 mW
Texas Instruments ADS1285IRHBT	External	1:1	85 °C	-40 °C	4k	3.6 V	2.7 V	MUX-PGA-ADC	5.25 V	3 V	32	3-Wire Serial SPI	2	1	32-VQFN (5x5)	32-VFQFN Exposed Pad	Sigma-Delta	Surface Mount	Differential

Catalog

32-bit high-resolution two-channel delta-sigma ADC for seismic and geospace exploration

Key Features

• Selectable resolution-power modes:Dynamic range: 134 dB at 2 ms, 11.5 mWDynamic range: 129 dB at 2 ms, 4.8 mWFlexible digital filter:Selectable sinc + FIR + IIRLinear or minimum phaseHigh-pass filterTHD: < –120 dBCMRR: 125 dBData rates: 125 SPS to 4000 SPSProgrammable gains: 1 to 64PGA bypass optionSYNC inputClock error compensationTwo-channel multiplexerOffset and gain calibrationGeneral-purpose digital I/OsAnalog supply operation: 5 V, 3.3 V, or ±2.5 VReference voltage options: 5 V, 4.096 V, or 2.5 VSelectable resolution-power modes:Dynamic range: 134 dB at 2 ms, 11.5 mWDynamic range: 129 dB at 2 ms, 4.8 mWFlexible digital filter:Selectable sinc + FIR + IIRLinear or minimum phaseHigh-pass filterTHD: < –120 dBCMRR: 125 dBData rates: 125 SPS to 4000 SPSProgrammable gains: 1 to 64PGA bypass optionSYNC inputClock error compensationTwo-channel multiplexerOffset and gain calibrationGeneral-purpose digital I/OsAnalog supply operation: 5 V, 3.3 V, or ±2.5 VReference voltage options: 5 V, 4.096 V, or 2.5 V

Description

The ADS1285 is a 32-bit, low-power, analog-to-digital converter (ADC), with a programmable gain amplifier (PGA) and a finite impulse response (FIR) filter. The ADC is designed for the demanding needs of seismology equipment requiring low-noise precision digitization and extended battery run time. The low-noise PGA allows direct connection of geophones and transformer-coupled hydrophones without the need of an external amplifier. 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 7-ppb resolution. Choice of power modes optimize dynamic range verses power consumption. Power consumption is further reduced by PGA bypass operation. The ADC is available in a compact 5-mm × 5-mm VQFN package and is fully specified over the –40°C to +85°C ambient temperature range. The ADS1285 is a 32-bit, low-power, analog-to-digital converter (ADC), with a programmable gain amplifier (PGA) and a finite impulse response (FIR) filter. The ADC is designed for the demanding needs of seismology equipment requiring low-noise precision digitization and extended battery run time. The low-noise PGA allows direct connection of geophones and transformer-coupled hydrophones without the need of an external amplifier. 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 7-ppb resolution. Choice of power modes optimize dynamic range verses power consumption. Power consumption is further reduced by PGA bypass operation. The ADC is available in a compact 5-mm × 5-mm VQFN package and is fully specified over the –40°C to +85°C ambient temperature range.