Low Power Analog-to-Digital Converters

DN Staff

March 31, 2011

1 Min Read
Low Power Analog-to-Digital Converters

Linear Technology Corp.'s family of lowpower 14-bit and 12-bit, 25Msps to 125Msps analog-to-digital converters (ADCs)dissipate less than 1mW per mega sample per sec from a 1.8V supply. The LTC2145family includes two-channel simultaneous sampling, parallel output ADCs, offeringa choice of full-rate CMOS, or double data rate (DDR) CMOS or DDR LVDS digitaloutputs with programmable digital output timing, programmable LVDS outputcurrent and optional LVDS output termination. At 25Msps the 14-bit and 12-bit versions of the LTC2140 consume 24mW perchannel, while the 125Msps LTC2145 consumes 95mW per channel. While claimingthe lowest power dissipation, AC performance has not been compromised. At14-bits, these devices achieve over 73.2dB SNR performance with 90dB of SFDR atbaseband. At 12-bits, the SNR performance is better than 70.6dB. This A dcfamily offers a pin-compatible upgrade path to the low power LTC2185 16-bit Adc family to provide a 3dB performance upgrade while maintaining portability insuch applications as handheld test and instrumentation, radar/LIDAR, medicalimaging, PET/SPECT scanners, military radios, smart antenna systems and a rangeof low-power communication systems.

Pin-compatible speedgrade options include 25Msps (24mW/ch), 40Msps (33mW/ch), 65Msps (46mW/ch),80Msps (55mW/ch), 105Msps (75mW/ch) and 125Msps (95mW/ch). Additional powersavings can be achieved by placing the devices in standby (16mW) or shutdown(1mW). Analog full power bandwidth of 750MHz and ultralowjitter of 0.08psRMS allows undersampling of IF frequencies withexcellent noise performance. These devices incorporate Linear Technology'sdigital output randomizer and alternate bit polarity (ABP) mode feature forreduced digital feedback.

Available in 9 x 9mmQFN packages, designers can benefit from the flexible choice of interfaces thatminimize pin count and ease routing to FPGAs. These A dcs will be available inproduction quantities beginning in May through June 2011.
Low Power Analog-to-Digital Converters

Low Power Analog-to-Digital Converters


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