ADS1255
Every spec below is cited to the manufacturer datasheet. Compare the closest alternatives, then ask the assistant what it means for your design.
What the ADS1255 does
The ADS1255 and ADS1256 are extremely low-noise, 24-bit analog-to-digital converters designed for high-resolution measurement solutions. These delta-sigma modulators offer up to 23 bits of noise-free resolution, a data rate reaching 30,000 samples per second, and a programmable gain amplifier ranging from 1 to 64. The devices feature a flexible input multiplexer with sensor detect circuitry and chopper-stabilized buffers to handle differential or single-ended signals. Typically used in scientific instrumentation, industrial process control, medical equipment, and weigh scales, they support self and system calibration for all gain settings. The ADS1255 comes in an SSOP-20 package, while the ADS1256 includes four additional differential inputs in an SSOP-28 package.
Datasheet parameters
| Parameter | Min | Typ | Max | Conditions | Source |
|---|---|---|---|---|---|
| supply voltage range | 4.75 V | — | 5.25 V | Power-Supply | TI datasheet, p. 4 — ELECTRICAL CHARACTERISTICS (continued) |
| input offset voltage drift | — | 100 nV/°C | — | PGA = 1; System Performance | TI datasheet, p. 3 — ELECTRICAL CHARACTERISTICS |
| cmrr | 95 dB | 110 dB | — | fCM(4) = 60Hz, fDATA = 30kSPS(5); common; System Performance | TI datasheet, p. 3 — ELECTRICAL CHARACTERISTICS |
| operating temperature | -40 °C | — | 85 °C | TI datasheet, p. 39 — PACKAGING INFORMATION | |
| power dissipation | — | 38 mW | 57 mW | Normal mode, PGA = 1, Buffer off, DVDD = 3.3V; Power-Supply | TI datasheet, p. 4 — ELECTRICAL CHARACTERISTICS (continued) |
| psrr | 60 dB | 70 dB | — | ±5% Δ in AVDD; System Performance | TI datasheet, p. 3 — ELECTRICAL CHARACTERISTICS |
| adc resolution | — | 24 bit | — | TI datasheet, p. 1 | |
| output voltage high | 800 mV | — | — | IOH = 5mA; voh; Digital Input/Output | TI datasheet, p. 3 — ELECTRICAL CHARACTERISTICS |
| output voltage low | — | 200 mV | — | IOL = 5mA; vol; Digital Input/Output | TI datasheet, p. 3 — ELECTRICAL CHARACTERISTICS |
| sample rate | — | 30 kHz | — | TI datasheet, p. 1 | |
| settling time | — | 210 µs | — | Data rate = 30, 000 SPS | TI datasheet, p. 20 — Table 13. Settling Time vs Data Rate |
| channel count | — | 2 | — | TI datasheet, p. 14 |
Closest matches to ADS1255
Frequently asked questions
What is the ADC resolution of the ADS1255?
The ADC resolution is 24 bit.
What is the channel count of the ADS1255?
The channel count is 2.
What is the common-mode rejection ratio (CMRR) when fCM(4) = 60Hz and fDATA = 30kSPS(5)?
The CMRR is 110 dB.
What is the input offset voltage drift when PGA = 1 under System Performance conditions?
The input offset voltage drift is 100 nV/°C.
What is the maximum operating temperature for the ADS1255?
The maximum operating temperature is 85 °C.
What is the output voltage high (voh) when IOH = 5mA?
The output voltage high is 800 mV when IOH = 5mA.
What is the maximum output voltage low for the Digital Input/Output when IOL = 5mA?
The output voltage low is 200 mV.
What is the power dissipation of the ADS1255 in Normal mode with PGA = 1, Buffer off, and DVDD = 3.3V?
The power dissipation is 38 mW.
What is the PSRR under ±5% Δ in AVDD for System Performance?
The PSRR is 70 dB.
What is the maximum sample rate of the ADS1255?
The maximum sample rate is 30 kHz.
What is the settling time of the ADS1255 when the data rate is 30, 000 SPS?
The settling time is 210 µs at a data rate of 30, 000 SPS.
What is the maximum supply voltage under Power-Supply conditions?
The maximum supply voltage is 5.25 V.