Input ADC offers fault protection up to ±30 V

Milpitas, Calif. — Linear Technology released the LTC1856, a 5 V, 16-bit, 8-channel, 100 ksamples/s analog-to-digital (ADC) converter with ±10 V input ranges and additional fault protection. An overvoltage fault up to ±30 V on one or more unused channels will not corrupt the accuracy of the selected channel and provides protection on 24 V (±10% tolerance) industrial supply lines. The LTC1856's multiplexer can be configured to accept 4 differential inputs, 8 single-ended inputs or combinations of both. This ADC offers DC performance of 15-bit, no missing codes, overtemperature and ±3 LSB (max) INL. It also achieves AC performance of 87 dB SINAD, -101 dB THD and is used for multichannel high-resolution applications including instrumentation and industrial process control.

Operating from a single 5 V supply, the LTC1856 consumes 40 mW at 100 ksamples/s. The LTC1856 includes a 2.5 V internal reference with a typical temperature coefficient of ±10 ppm/°C, which can also be externally driven for improved accuracy. For power sensitive applications, the LTC1856 offers two power-down modes in which the power dissipation drops to 27.5 mW in nap mode with the reference active, or 40 µW in sleep mode with the reference powered down.

The LTC1856 is part of a pin- and software-compatible family available in SSOP-28 packages which includes the LTC1855 (14-bit) and LTC1854 (12-bit). The entire family is available today in commercial and industrial temperature ranges. Pricing begins at $12.95 each for the LTC1856, $7.95 each for the LTC1855 and $5.60 each for the LTC1854 in 1,000-piece quantities.

Availability: Now
Pricing: Begins at $12.95 each in 1,000-piece quantities
Data Sheet: LTC1856 ADC

Linear Technology, 408-432-1900,

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