Linear Technology ADCs dissipate less power
Linear Technology
LTC2175-14 ADCs
Linear Technology has announced a range of 24 ultralow power 14/12-bit, 125 to 25Msps, quad and dual ADCs that are said to dissipate as little as one third of the power of competing ADCs.
The flagship ADC is the LTC2175-14, a quad 14-bit, 125Msps ADC that dissipates 558mW (140mW per channel).
The LTC2175 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 analogue and digital supplies, the LTC2175 includes a sleep mode that reduces power dissipation to 1mW.
Whether operating at full speed or in sleep mode, this ADC is said to 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 minimise 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 7 x 8mm QFN package, requiring less board area for data I/O lines and simplified layout.
The LTC2175 includes 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 randomiser that reduces digital feedback, seven programmable LVDS output current levels, internal 100Ohm LVDS output-termination resistors and digital-output test patterns.
These settings can be programmed via SPI or hardwired for a reduced set of operating modes.
The LTC2175 is part of a range of pin-compatible quad ADCs, offering 14 and 12-bit resolution from 25 up to 125Msps.
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