The LTC2420 is a micropower 20-bit A/D converter with an integrated oscillator, 8ppm INL and 1.2ppm RMS noise that operates from 2.7V to 5.5V. It uses delta-sigma technology and provides a digital filter that settles in a single cycle for multiplexed applications. Through a single pin, the LTC2420 can be configured for better than 110dB rejection at 50Hz or 60Hz ±2%, or it can be driven by an external oscillator for a user-defined rejection frequency in the range 1Hz to 800Hz. The internal oscillator requires no external frequency setting components. The converter accepts any external reference voltage from 0.1V to V CC. With its extended input conversion range of –12.5% V REF to 112.5% V REF, the LTC2420 smoothly resolves the offset and overrange problems of preceding sensors or signal conditioning circuits. The LTC2420 communicates through a flexible 3-wire digital interface which is compatible with SPI and MICROWIRE protocols.
- 20-Bit ADC in SO-8 package
- 8ppm INL, no missing codes at 20 bits
- 4ppm full-scale error
- 0.5ppm offset
- 1.2ppm noise
- Digital filter settles in a single cycle. Each conversion is accurate, even after an input step
- Fast mode: 16-Bit noise, 12 bits TUE at 100sps
- Internal oscillator—no external components required
- 110dB min, 50Hz/60Hz notch filter
- Reference input voltage: 0.1V to V CC
- Live zero—extended input range accommodates 12.5% overrange and underrange
- Single supply 2.7V to 5.5V operation
- Low supply current (200µA) and auto shutdown
- Pin compatible with 24-Bit LTC2400
- Operating temp.: -40 to +85°C
- For full details please refer to data sheet
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