Low Power, 8-/16-Channel, 31.25 kSPS, 24-Bit, Highly Integrated Sigma-Delta ADC

Fast settling, highly accurate, low power, 8-/16-channel, multiplexed ADC for low bandwidth input signals with integrated input buffers.

Integrated precision, 2.5 V, low drift (3.5 ppm/°C), band gap reference and integrated oscillator.

Eight flexible setups with configurability for output data rate, digital filter mode, offset/gain error correction, reference selection, buffer enables and more. This per channel configurability extends to the output data rate used for each channel when using sinc5 + sinc1 filter.

Sinc5 + sinc1 filter maximizes channel scan rate, and sinc3 filter maximizes resolution and enhanced 50 Hz/60 Hz rejection, with four selectable options to maximize rejection.

Integrated diagnostic features, including CRC, register checksum, temperature sensor, crosspoint multiplexer, burnout currents, and GPIOs/GPOs.

Applications

* Process control: PLC/DCS modules

* Voltage, current, temperature, and pressure measurement

* Flow meters

* Medical and scientific multichannel instrumentation

* Seismic instrumentation

* Chemical analysis instrumentation: chromatography

* Low power, 8-/16-channel, highly integrated multiplexed analog-to-digital converter (ADC)

* Integration

* Precision analog input buffers and reference input buffers

* 2.5 V precision reference (3.5 ppm/°C)

* Cross point multiplexer (enable system diagnostic)

* 8 full differential or 16 single-ended channels

* Clock oscillator

* GPIO and GPO pins with automatic external mux control

* Fast and flexible output rate: 1.25 SPS to 31.25 kSPS

* Channel scan data rate: 6.21 kSPS/channel (161 μs settling)

* Performance specifications

* 17.5 noise free bits at 31.25 kSPS

* 24 noise free bits at 1.25 SPS

* INL: ±3 ppm/FSR

* 85 dB rejection of 50 Hz and 60 Hz with 50 ms settling

* Operates with either 3.3 V or 5 V supply

* Single supply

* 3.3 V or 5 V AVDD1, 2 V to 5 V AVDD2, and 2 V to 5 V IOVDD

* Optional split supply

* AVDD1 and AVSS ± 2.5 V or AVDD1 and AVSS ± 1.65 V

* Current: 1.4 mA

* 3-/4-wire serial digital interface (Schmitt trigger on SCLK)

* CRC error checking

* SPI, QSPI, MICROWIRE, and DSP compatible

* Package: 40-lead 6 mm × 6 mm LFCSP

* Temperature range: −40°C to +105°C