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Overview
The CM1310 is a precision, low-power, SPI-compatible 24-bit ΔΣ ADC. It integrates a low-noise programmable gain amplifier (PGA), two programmable output current sources (IDACs), a voltage reference, an oscillator, a low-side switch, and a precision temperature sensor. These features make the CM1310 well suited for measuring small signals such as resistance temperature detectors (RTDs), thermocouples, thermistors, and bridge sensors.
The CM1310 supports data conversion rates up to 2 kSPS and achieves single-cycle settling. The input multiplexer (MUX) provides four single-ended inputs or two differential input pairs. For industrial applications, the digital filter provides simultaneous 50 Hz and 60 Hz rejection at a sampling rate of 20 SPS. When the PGA is enabled, pseudo-differential or fully differential inputs are supported; when the PGA is disabled, the device still offers high input impedance, gain up to 4 V/V, and supports single-ended measurements.
The CM1310 is available in a TSSOP16 package and operates over a temperature range of −40°C to 125°C.
Features
Wide supply voltage range: 2.3 V to 5.5 V
Programmable gain: 1 V/V to 128 V/V
Programmable data rate: up to 2 kSPS
Single-cycle settling
50 Hz and 60 Hz harmonic rejection at 20 SPS
Four single-ended inputs or two differential input pairs
Programmable matched current sources: 10 μA to 1.5 mA
Integrated 2.048 V reference with typical temperature drift of 5 ppm/°C
SPI-compatible interface, Mode 1
Low current consumption: 210 μA typical (duty-cycle mode)
TSSOP16 package, 5 mm × 4.4 mm
Applications
Industrial control and automation
Industrial field instrumentation
Smart temperature and pressure transmitters
Temperature sensor measurements
2-wire / 3-wire / 4-wire RTD measurements
Thermocouple measurements
PLC/DCS analog input modules
Scientific and laboratory instrumentation
