AD9248

Features:

Integrated Dual 14-Bit A-to-D Converters
Single 3 V Supply Operation (2.7 V to 3.6 V)
SNR = 73 dBc (to Nyquist, AD9248-65)
SFDR = 83 dBc (to Nyquist, AD9248-65)
Low Power: 600 mW at 65 MSPS
Differential Input with 500 MHz 3 dB Bandwidth
Exceptional Cross Talk Immunity > 85dB
Flexible Analog Input: 1 V p-p to 2 V p-p Range
Offset Binary or Twos Complement Data Format
Clock Duty Cycle Stabilizer




Application

Ultrasound Equipment
IF Sampling in Communications Receivers:
IS-95, CDMA One, IMT-2000
Battery-Powered Instruments
Hand-Held Scopemeters
Low Cost Digital Oscilloscopes




Pinout








Specifications



AVDD AGND - 0.3 +3.9 V
DRVDD DRGND - 0.3 +3.9 V
AGND DRGND - 0.3 +0.3 V
AVDD DRVDD - 3.9 +3.9V




Description

The AD9248 is a dual, 3 V, 14-bit, 20/40/65 MSPS analog -to-digital converter. It features dual high performance sample-and hold amplifiers and an integrated vol tage reference. TheAD9248 uses a multistage differential pipelined architecture with output error correction logic to provide 14-bit accuracy and guarantee no missing codes over the full operating temperature range at up to 65 MSPS data rates. The wide bandwidth, differential SHA allows for a variety of userselectable input ranges and offsets including single-ended applications. It is suitable for various applications including multiplexed systems that switch full-scale voltage levels in successive channels and for sampling inputs at frequencies well beyond the Nyquist rate.

Dual single-ended clock inputs are used to control all internal conversion cycles. A duty cycle stabilizer is available on the AD9248-65 and can compensate for wide variations in th e clock duty cycle, allowing the converters to maintain excellent performance. The digital output data is presented in either
straight binary or twos complement format. Out-of-range signals indicate an overflow condition, which can be used with the most significant bit to determine low or high overflow. Fabricated on an advanced CMOS process, the AD9248 is available in a space saving 64-lead LQFP and is specified over the industrial temperature range (40? C to +85? C).