ADS1220
Every spec below is cited to the manufacturer datasheet. Pick your exact ordering code, compare the closest alternatives, then ask the assistant what it means for your design.
What the ADS1220 family does
The ADS1220 is a precision, 24-bit analog-to-digital converter featuring a programmable gain amplifier, internal reference, and dual-matched current sources. It supports data rates up to 2kSPS with up to 20 bits of effective resolution and a wide supply range of 2.3V to 5.5V. The device offers simultaneous 50Hz and 60Hz rejection at 20SPS and consumes as little as 120μA in duty-cycle mode. Designed for measuring small sensor signals, it is typically used in field transmitters, patient monitoring systems, and factory automation to capture temperature, pressure, strain, and flow data from RTDs, thermocouples, and resistive bridge sensors.
ADS1220 datasheet parameters
| Parameter | Min | Typ | Max | Conditions | Source |
|---|---|---|---|---|---|
| quiescent current | — | 100 nA | 3 µA | Power-down mode; iavdd; POWER SUPPLY | TI datasheet, p. 8 — 6.5 Electrical Characteristics |
| supply voltage range | — | 62.5 mV | 250 mV | TEMPERATURE SENSOR | TI datasheet, p. 8 — 6.5 Electrical Characteristics |
| rds on | — | 3.5 Ohm | 5.5 Ohm | ron; LOW-SIDE POWER SWITCH | TI datasheet, p. 8 — 6.5 Electrical Characteristics |
| input offset voltage drift | 250 nV/°C | — | 300 nV/°C | PGA disabled, gain = 1 to 4; SYSTEM PERFORMANCE | TI datasheet, p. 7 — 6.5 Electrical Characteristics |
| input offset voltage | -30 µV | 4 µV | 30 µV | Gain = 1, differential inputs, TA = 25°C; vio; SYSTEM PERFORMANCE | TI datasheet, p. 7 — 6.5 Electrical Characteristics |
| cmrr | 90 dB | 105 dB | — | At dc, gain = 1; cmrr; SYSTEM PERFORMANCE | TI datasheet, p. 7 — 6.5 Electrical Characteristics |
| operating temperature | -40 °C | — | 125 °C | ta; TEMPERATURE RANGE | TI datasheet, p. 6 — over operating ambient temperature range (unless otherwise noted) |
| clock frequency | 500 kHz | 4.1 MHz | 4.5 MHz | fclk; EXTERNAL CLOCK SOURCE | TI datasheet, p. 6 — over operating ambient temperature range (unless otherwise noted) |
| power dissipation | — | 400 µW | — | Duty-cycle mode, PGA disabled; pd; POWER SUPPLY | TI datasheet, p. 8 — 6.5 Electrical Characteristics |
| propagation delay | 0 s | — | 50 ns | DOUT load = 20pF || 10kΩ to DGND; tp(scdo); 6.7 SPI Switching Characteristics | TI datasheet, p. 9 — 6.7 SPI Switching Characteristics |
| psrr | 80 dB | 105 dB | — | AVDD at dc, VCM = 0.5 AVDD, gain = 1; psrr; SYSTEM PERFORMANCE | TI datasheet, p. 7 — 6.5 Electrical Characteristics |
| adc resolution | — | 24 bit | — | TI datasheet, p. 1 | |
| output voltage high | 800 mV | — | — | IOH = 3mA; voh; DIGITAL INPUTS/OUTPUTS | TI datasheet, p. 8 — 6.5 Electrical Characteristics |
| output voltage low | — | — | 200 mV | IOL = 3mA; vol; DIGITAL INPUTS/OUTPUTS | TI datasheet, p. 8 — 6.5 Electrical Characteristics |
| sample rate | — | 2 kHz | — | TI datasheet, p. 1 | |
| settling time | — | 50 ms | — | normal mode, 20 SPS, single-cycle settling (continuous conversion time 204768 tCLK) | TI datasheet, p. 30 — Table 8-4. Conversion Times |
| channel count | — | 4 | — | TI datasheet, p. 1 |