LTC2430/LTC2431 are 2.7V to 5.5V micropower 20-bit differential ∆Σ analog-to-digital converters with an integrated oscillator, 3ppm INL and 0.56ppm RMS noise. They use delta-sigma technology and provide single cycle settling time for multiplexed applications. Through a single pin, the LTC2430/LTC2431 can be configured for better than 110dB differential mode rejection at 50Hz or 60Hz ±2%, or they can be driven by an external oscillator for a user-defined rejection frequency. The internal oscil- lator requires no external frequency setting components. The converters accept any external differential reference voltage from 0.1V to VCC for flexible ratiometric and remote sensing measurement configurations. The full- scale differential input range is from –0.5VREF to 0.5VREF. The reference common mode voltage, VREFCM, and the input common mode voltage, VINCM, may be indepen- dently set anywhere within GND to VCC. The DC common mode input rejection is better than 120dB. The LTC2430/LTC2431 communicate through a flexible 3-wire digital interface that is compatible with SPI and MICROWIRE TM protocols.
The LTC2430 and LTC2431 are 20‑bit, micropower, no‑latency analog‑to‑digital converters from Linear Technology. They operate from a single 2.7 V to 5.5 V supply, feature differential inputs and reference, an internal oscillator, and a 3‑wire digital interface compatible with SPI and Microwire. Typical applications include weight scales, temperature measurement, strain‑gauge transducers, data acquisition, and industrial process control.
The datasheet details absolute maximum ratings, electrical characteristics, timing parameters, and package information (16‑lead plastic SSOP or 10‑lead MSOP). It also includes typical performance graphs, recommended solder‑pad layouts, and a list of related parts for system designers.
| Resolution | 20 bits |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V |
| Integral Nonlinearity (INL) | 3 ppm |
| RMS Noise | 0.56 ppm |
| Package Type | 16‑Lead Plastic SSOP (narrow) |
| Operating Temperature Range | -40 °C to 85 °C |
The devices operate from a single supply voltage of 2.7 V to 5.5 V.
Both converters deliver 20‑bit resolution.
They use a 3‑wire digital interface compatible with SPI and Microwire™ protocols.