Linear Technology Corp. (LTC) has developed a family of 14- and 12-bit, 25- to 125-Msample/s analog-to-digital converters (ADCs) that dissipate less than 1 mW/Msample/s from a 1.8-V supply. The LTC2145 family includes two-channel simultaneous sampling, parallel output ADCs,  offering a choice of full-rate CMOS, or double data rate (DDR) CMOS or DDR LVDS digital outputs with programmable digital output timing, programmable LVDS output current and optional LVDS output termination.

At 25 Msampples/s, the 14- and 12-bit versions of the LTC2140 consume just 24 mW/channel, while the 125-Msample/s LTC2145 consumes 95 mW/channel. At 14-bits, these devices achieve over 73.2-dB SNR performance with 90 dB of SFDR at baseband. At 12-bits, the SNR performance is better than 70.6dB.

Pin-compatible speed grade options include 25, 40, 65, 80, 105, and 125 Msampples/s. Additional power savings can be achieved by placing the devices in standby (16 mW) or shutdown (1 mW) mode.

The parts are available now in 9- by 9-mm QFN packages. Demo boards are also available. Prices start at $10.95 each for the dual 12-bit, 25-Msample/s devices in 1000-piece quantities.

Richard Nass