GENERAL DESCRIPTION

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.

FEATURES

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 or5 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

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