GENERAL DESCRIPTION

The AD9238 is a dual, 3 V, 12-bit, 20 MSPS/40 MSPS/65 MSPS analog-to-digital converter (ADC). It features dual high performance sample-and-hold amplifiers (SHAs) and an integrated voltage reference. The AD9238 uses a multistage differential pipelined architecture with output error correction logic to provide 12-bit accuracy and to 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 user-selectable input ranges and offsets, including single-ended applications.

FEATURES

Integrated dual 12-bit ADC

Single 3 V supply operation (2.7 V to 3.6 V)

SNR = 70 dB (to Nyquist, AD9238-65)

SFDR = 80.5 dBc (to Nyquist, AD9238-65)

Low power: 300 mW/channel at 65 MSPS

Differential input with 500 MHz, 3 dB bandwidth

Exceptional crosstalk immunity > 85 dB

Flexible analog input: 1 V p-p to 2 V p-p range

Offset binary or twos complement data format

Clock duty cycle stabilizer

Output datamux option

APPLICATIONS

Ultrasound equipment

Direct conversion or IF sampling receivers

WB-CDMA, CDMA2000, WiMAX

Battery-powered instruments

Hand-held scopemeters

Low cost, digital oscilloscopes