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VOLUME -24 NUMBER 9
Publication Date: 09/1/2009
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September 2009 Issue
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Low Power Quad/Dual 14-Bit ADCs from Linear
Milpitas, CA — Linear Technology Corporation is introducing a family of 24 ultralow power 14-bit/12-bit, 125Msps to 25Msps, quad and dual ADCs that dissipate as little as 1/3 the power of competing ADCs. The flagship ADC is the LTC2175-14, a quad 14-bit, 125Msps unit that dissipates only 558mW (140mW per channel).
The new family of ADCs significantly reduces system power without sacrificing AC performance, offering signal-to-noise ratio (SNR) performance of 73.4dB and spurious free dynamic range (SFDR) of 88dB at baseband.
Operating from 1.8V analog and digital supplies, the LTC2175 includes a sleep mode that reduces power dissipation to just 1mW. Whether operating at full speed or in sleep mode, this ADC significantly lowers the power budget for highspeed multichannel designs such as multiple-input multiple-output (MIMO) WiMAX/LTE and 3G basestations, portable medical imaging and non-destructive testers.
Data is output from the LTC2175 in serial LVDS format to minimize the number of data lines. At 125Msps, each channel outputs two bits at a time, using two lanes per ADC. At lower sample rates, a one bit per channel option is available. The LTC2175 offers serial data communication and four ADCs in a small 7mm x 8mm QFN package, requiring less board area for data I/O lines and simplified layout. The new units include an SPI-compatible interface that allows users to choose between a variety of data settings that reduce digital feedback and simplify design. Options include a data output randomizer that reduces digital feedback, seven programmable LVDS output current levels, internal 100Ω LVDS output termination resistors, and digital output test patterns. These settings can be programmed via SPI or hard-wired for a reduced set of operating modes.
The LTC2175 is a family of pin-compatible quad ADCs, offering 14-bit and 12-bit resolution from 25Msps up to 125Msps. All devices are supported with demonstration boards and free software for quick device evaluation.
Contact: Linear Technology Corp., 1630 McCarthy Blvd., Milpitas, CA 95035-7417
408-432-1900 fax: 408-434-0507 Web:
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