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µModule ADC offers 125Msps at 140mW per channel

Posted: 10 May 2011     Print Version  Bookmark and Share

Keywords:channel  power  time 

Linear Technology Corp. reveals a family of low power 14bit, 80Msps, 105Msps and 125Msps octal µModule ADCs that claim excellent AC performance and low power in a small form factor.

The LTM9011-14 is an octal 14bit, 125Msps ADC with 73.1dB signal to noise ratio (SNR) and 88dB spurious free dynamic range (SFDR) at base band. The power dissipation is 140mW per channel. The 80Msps LTM9009-14 and 105Msps LTM9010-14 consume 94mW per channel and 113mW per channel, respectively. Operating from 1.8V analogue and digital supplies, the LTM9011 family includes a sleep mode that reduces power dissipation to just 2mW. Whether operating at full speed or in sleep mode, this ADC lowers the power budget for high speed multi-channel designs such as multiple-input multiple-output (MIMO) WiMAX/LTE, remote radio heads (RRH), military anti-jamming devices, radar, medical imaging and ultrasound applications.

Data is output from the LTM9011 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 sample rates below 62Msps, a one bit per channel option is available. The LTM9011 offers serial data communication and eight simultaneous sampling ADCs in a low profile 140-pin 11.25mm x 9mm BGA µModule package. In addition, the device integrates bypass capacitance and provides a flow-through pinout, reducing the required board area for routing data I/O lines and simplifying layout.

The LTM9011 includes an SPI-compatible interface that enables 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.

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