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