GENERAL DESCRIPTION

The AD6659 is a mixed-signal, dual-channel IF receiver supporting radio topologies requiring two receiver signal paths, such as in main/diversity or direct conversion. This communications systems processor consists of two high performance analog-todigital converters (ADCs) and noise shaping requantizer (NSR) digital blocks. It is designed to support various communications applications where high dynamic range performance and small size are desired.

FEATURES

12-bit, 80 MSPS output data rate per channel

1.8 V analog supply operation (AVDD)

1.8 V to 3.3 V output supply (DRVDD)

Integrated noise shaping requantizer (NSR)

Integrated quadrature error correction (QEC)

Performance with NSR enabled

SNR = 81 dBFS in 16 MHz band up to 30 MHz at 80 MSPS

Performance with NSR disabled

SNR = 72 dBFS up to 70 MHz at 80 MSPS

SFDR = 90 dBc up to 70 MHz input at 80 MSPS

Low power: 98 mW per channel at 80 MSPS

Differential input with 700 MHz bandwidth

On-chip voltage reference and sample-and-hold circuit

2 V p-p differential analog input

Serial port control options

Offset binary, gray code, or twos complement data format

Optional clock duty cycle stabilizer

Integer 1-to-6 input clock divider

Data output multiplex option

Built-in selectable digital test pattern generation

Energy-saving power-down modes

Data clock out with programmable clock and data alignment

APPLICATIONS

Communications

Diversity radio systems

Multimode digital receivers

3G, W-CDMA, LTE, CDMA2000, TD-SCDMA, MC-GSM

I/Q demodulation systems

Smart antenna systems

Battery-powered instruments

General-purpose software radios