Speedy dual convertor suits software-defined radio

Edited by the Electronicstalk editorial team Feb 13, 2006

The LTC2284 is a 14bit 105Msample/s dual high speed ADC that delivers a flat SNR response of 72.2dB up to 70MHz, as well as SFDR of 88dB at baseband.

Linear Technology has announced the LTC2284, a 14bit 105Msample/s dual high speed ADC that delivers a flat SNR response of 72.2dB up to 70MHz, as well as SFDR of 88dB at baseband.

The LTC2284 is the latest in a pin-compatible family of dual ADCs recognised for their low power, small solution size and excellent crosstalk specifications.

These features, bundled with their high dynamic range performance, make these devices ideal for portable communications equipment and the latest generation of software defined radios.

The 10bit LTC2280 and 12bit LTC2282 105Msample/s dual ADCs accompany the LTC2284.

Featuring a wide bandwidth sampling rate of 105Msample/s, these three dual ADCs expand an already extensive 3V family of 10, 12 and 14bit parts ranging from 10 to 105Msample/s.

Pin-compatibility offers designers more flexibility during product development and provides a fast and cost-effective upgrade path for existing designs.

All three 105Msample/s ADCs have low power consumption of just 270mW per channel and very low crosstalk between channels of -110dB.

The LTC2284 low power family is packaged in a small 9 x 9mm QFN package.

The integrated bypass capacitance further reduces the overall solution size.

The part provides the flexibility to choose between two input spans.

The ADCs are optimised for undersampling of signals up to 140MHz and have a wide analogue input bandwidth of 575MHz.

For downconversion signal chains, Linear Technology recommends the LT5516 direct conversion quadrature demodulator and LT1993 low distortion, low noise ADC driver.

All three devices are supported with demo boards for quick device evaluation, which can be purchased online.

The LTC2284, LTC2282 and LTC2280 are available today in production quantities in both commercial and industrial temperature grades and are competitively priced at $61.50, $34.50 and $11.25, respectively, in 1000-piece quantities.

In addition to the low power dual ADCs, Linear Technology offer an equivalent family of high performance single channel ADCs ranging up to 14bit 125Msample/s, LTC2255.