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

FEATURES
   SNR = 70.6 dBFS at 185 MHz AIN and 250 MSPS
   SFDR = 85 dBc at 185 MHz AIN and 250 MSPS
   −151.6 dBFS/Hz input noise at 185 MHz, −1 dBFS AIN and
      250 MSPS
   Total power consumption: 785 mW at 250 MSPS
   1.8 V supply voltages
   LVDS (ANSI-644 levels) outputs
   Integer 1-to-8 input clock divider (625 MHz maximum input)
   Sample rates of up to 250 MSPS
   IF sampling frequencies of up to 400 MHz
   Internal ADC voltage reference
   Flexible analog input range
      1.4 V p-p to 2.0 V p-p (1.75 V p-p nominal)
   ADC clock duty cycle stabilizer
   95 dB channel isolation/crosstalk
   Serial port control
   Energy saving power-down modes
   User-configurable, built-in self-test (BIST) capability

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