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ADC targets comms equipment, instrumentation apps

Posted: 10 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:ADC? communications equipment? instrumentation applications?

Linear Technology Corp. has announced the a 16bit 160MSps, high-performance, high-speed ADC for leading-edge communications equipment and instrumentation applications. The LTC2209 extends the sampling frequency of the LTC2208 family, offering a pin-compatible upgrade path for existing designs. The new device has an SNR of 77.1dB and SFDR of 100dB at baseband, consuming only 1450mW from a 3.3V supply.

The LTC2209 has two unique features that simplify receiver design and improve system performance. The first is an internal transparent dither circuit that improves the ADC's SFDR response well beyond 100dBc for low-level input signals. The second is a digital output randomizer that reduces unwanted tones caused by digital feedback. The flexible digital outputs can be run as CMOS or LVDS.

The ADC also features a programmable gain amplifier (PGA) front end that eases the ADC driver output power requirements when driving the lower input range of 1.5VP-P. This improves the distortion performance and power consumption of the driver with minimal impact on ADC noise performance.

The device delivers an extensive feature set in a 9mm x 9mm QFN package, ensuring low power consumption of 1450mW without the need for heat sinking. Total solution size with integrated bypass capacitance is less than half the nearest competitor, and power consumption is equivalent to competitive parts sampling at half the speed. Designed for ease-of-use, the LTC2209 requires only a single 3.3V supply for operation and comes with a clock duty cycle stabilizer for maintaining the ADC's performance over varying duty cycles. The LTC2209 can accept high frequency, wide dynamic range signals, offering a wide analog input bandwidth of 700MHz.

The LTC2209 family includes speed grades of 160-, 130-, 105-, 80-, 65-, 40-, 25- and 10MSps, all with superior SFDR and SNR performance. In addition to the 16bit LTC2209, the pin-compatible LTC2209-14 14bit version will also be available. (Samples and demo boards for the LTC2209 are available from the company website). The LTC2209 is available today in both commercial and industrial temperature grades, and is priced at $72.50 each in 1,000-piece quantities. All parts can be ordered in optional Pb-free packages for RoHS compliance.

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