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4-channel delta-sigma A/D converter includes temperature sensor

Milpitas, Calif.—Linear Technology Corp. has introduced the LTC2493, a 4-channel delta-sigma A/D converter with an internal temperature sensor that offers 1/30°C resolution and 2°C absolute accuracy.

The accurate, integrated temperature sensor enables temperature compensation of external sensors. The LTC2493 communicates via a 2-wire I²C-compatible serial interface and measures four single-ended or 2 differential analog inputs in a tiny 4mm x 3mm DFN package, consuming 300uA(max).

The LTC2493's Easy Drive architecture results in zero average differential input current, allowing measurements of high impedance input sources without the use of an internal buffer. The LTC2493 directly digitizes rail-to-rail input signals while maintaining DC accuracy of 2ppm INL, making it suitable for measuring multiple sensor signals such as temperature, pressure or current monitoring.

The LTC2493 maintains 600nVRMS noise across the full input voltage range, enabling measurement of microvolt level changes or signals as large as ±-2.5V. The ADC converts the output of the temperature sensor or the input multiplexer, which can be configured for four single-ended channels, two differential channels, or two single-ended and one differential channel.

The LTC2493 performs conversions at rates of 15-Hz or 7.5-Hz while using the internal oscillator and can be configured to reject line frequencies of 50-Hz, 60-Hz or simultaneous 50-Hz/60-Hz.

For lower resolution applications, Linear is offering the LTC2489 and LTC2487, a pair of pin-compatible 16-bit A/D converters. The LTC2487 includes programmable gain, an internal temperature sensor and selectable output frequency rejection.

The LTC2493, LTC2489 and LTC2487 are all available in 4mm x 3mm DFN-14 packages, offering a pin-and software-compatible family for performance/cost optimization. The Easy Drive delta-sigma ADCs are all available in commercial and industrial temperature ranges.

Pricing: Begins at $2.95 each for the LTC2493, $2.35 each for the LTC2487, and $2.15 each for the LTC2489, in 1,000-piece quantities.
Availability: Now.
Datasheets:
LTC2493, LTC2489, and LTC2487.

Linear Technology Corp., 1-408-432-1900, www.linear.com

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