The DS1220 is a precision 24-bit analog-to-digital converter (ADC) designed to reduce system cost and component count for small sensor signal applications. It features a flexible multiplexer input (MUX), low-noise programmable gain amplifier, two excitation current sources, a voltage reference, an oscillator, a low-side switch, and an accurate temperature sensor, enabling support for two differential or four single-ended inputs. The device supports data rates up to 2000 samples per second with a single conversion cycle. At 20 SPS, the digital filter provides simultaneous 50 Hz and 60 Hz rejection for industrial noise suppression. The internal programmable gain amplifier offers high gain up to 128 V/V, making the ADS1220 ideal for measuring small signals from sensors such as resistance temperature detectors (RTDs), thermocouples, thermistors, and resistive bridge sensors. The device supports fully differential or pseudo-differential signal measurements using the integrated programmable gain amplifier. It can also be configured to allow single-ended inputs while maintaining high input impedance and gain up to 4 V/V. In duty-cycle mode, with the ADC disabled between conversions, power consumption is as low as 120 A. The ADS1220 is available in a lead-free VQFN-16 or TSSOP-16 package and is specified for operation over the temperature range of -40C to +125C. Key Features: - K-type thermocouple measurement capability - Low current consumption: as low as 120 A in duty-cycle mode (typical) - Supply voltage range: 3V to 5V - Up to 20 effective resolution bits - Two differential or four single-ended inputs - Dual matched programmable current sources: 10 A to 1.5 mA - Internal 2.048V voltage reference with 5 ppm/C (typical) drift - Internal 2% precision oscillator - Internal temperature sensor with 0.5C (typical) accuracy - SPI-compatible interface (Mode 1) Applications: - Temperature sensing systems - Thermistor measurement