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500KSps ADCs dissipate minimal power

Posted: 25 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:ADC? power dissipation? 500KSps converters?

Linear Technology Corp. has introduced the LTC2302 and LTC2306, pin- and software-compatible 1-/2-channel 12bit ADC.

The new ADCs communicate via an SPI-compatible serial interface at output rates up to 500KSps. The LTC2302 measures a single differential input channel, suitable for measuring bridge sensors. The LTC2306 includes an internal multiplexer and measures two single-ended or one differential input channel. Both are software-compatible with the LTC2308, a 12bit, 500KSps, 8-channel ADC, making it easy to port code between applications measuring one, two or eight analog channels.

The LTC2302/LTC2306 operate from a single 5V supply, dissipating only 15mW at the 500KSps output rate. Power dissipation decreases dramatically at slower output rates, dissipating only 70?W at 1KSps. For further power savings, a sleep mode reduces the power to 35?W. With their low power and tiny 3mm x 3mm DFN-10 package, the LTC2302/LTC2306 are suitable for high-speed DAQ and portable designs.

The LTC2302/LTC2306 are said to achieve excellent DC specifications, including 1LSB (max) INL and DNL. With a fully differential sample-and-hold circuit to reduce common mode noise, these ADCs also excel when digitizing AC input signals, measuring 73dB SINAD and -88dB THD at 10kHz. A separate digital output supply voltage (OVDD) allows users to configure the serial data output for 3V or 5V logic.

The LTC2302 and LTC2306 are available today in both commercial and industrial temperature grades. The LTC2302/LTC2306 are competitively priced, beginning at $2.10 for 1,000-piece quantities.

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