Product Details

      The AD9643 is a dual 14-bit, analog-to-digital converter (ADC) with sampling speeds up to 250 MSPS. The AD9643 is designed to support communications applications where low cost, small size, wide bandwidth and versatility are desired.

     The dual ADC core features a multistage, differential pipelined architecture with integrated output error correction logic. Each ADC features wide bandwidth inputs supporting a variety of user-selectable input ranges. An integrated voltage reference eases design considerations. A duty cycle stabilizer is provided to compensate for variations in the ADC clock duty cycle, allowing the converters to maintain excellent performance.

       The ADC output data are routed directly to the two external 14- bit LVDS output ports and formatted either as interleaved or channel multiplexed.

Flexible power-down options allow significant power savings, when desired.

Programming for setup and control are accomplished using a 3- wire SPI-compatible serial interface.

   The AD9643 is available in a 64-lead LFCSP and is specified over the industrial temperature range of −40°C to +85°C.

Applications

• Communications
• Diversity radio systems
• Multimode digital receivers (3G)
  TD-SCDMA, WiMax, WCDMA,
  CDMA2000, GSM, EDGE, LTE
• I/Q demodulation systems
• Smart antenna systems
• General-purpose software radios
• Ultrasound equipment
• Broadband data applications

FEATURES AND BENEFITS

• SNR = 71.5 dBFS at 185 MHz Ain and 250 MSPS
• SFDR = 85 dBc at 185 MHz Ain and 250 MSPS
• -152.0 dBFS/Hz Input Noise @ 200 MHz, -1dBFS Ain and 250MSPS
• Total Power consumption: 785mW @ 250 MSPS

• 1.8 V analog and LVDS output supply operation
• Integer 1-to-8 input clock divider (625 MHz maximum input)
• Integrated dual-channel ADC