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PRODUCT DESCRIPTION

The AD6623 is a 4-channel Transmit Signal Processor (TSP) that creates high bandwidth data for Transmit Digital-to-Analog Converters (TxDACs) from baseband data provided by a Digital Signal Processor (DSP). Modern TxDACs have achieved sufficiently high sampling rates, analog bandwidth, and dynamic range to create the first Intermediate Frequency (IF) directly.

FEATURES

Pin Compatible to the AD6622

18-Bit Parallel Digital IF Output

Real or Interleaved Complex

18-Bit Bidirectional Parallel Digital IF Input/Output

Allows Cascade of Chips for Additional Channels

Clipped or Wrapped Over Range

Two’s Complement or Offset Binary Output

Four Independent Digital Transmitters in Single Package

RAM Coefficient Filter (RCF)

Programmable IF and Modulation for Each Channel

Programmable Interpolating RAM Coefficient Filter

π/4-DQPSK Differential Phase Encoder

3π/8-PSK Linear Encoder

8-PSK Linear Encoder

Programmable GMSK Look-Up Table

Programmable QPSK Look-Up Table

All-Pass Phase Equalizer

Programmable Fine Scaler

Programmable Power Ramp Unit

High Speed CIC Interpolating Filter

Digital Resampling for Noninteger Interpolation Rates

NCO Frequency Translation

Carrier Output from DC to 52 MHz

Spurious Performance Better than –100 dBc

Separate 3-Wire Serial Data Input for Each Channel

Bidirectional Serial Clocks and Frames

Microprocessor Control

2.5 V CMOS Core, 3.3 V Outputs, 5 V Inputs

JTAG Boundary Scan

APPLICATIONS

Cellular/PCS Base Stations

Micro/Pico Cell Base Stations

Wireless Local Loop Base Stations

Multicarrier, Multimode Digital Transmit

GSM, EDGE, IS136, PHS, IS95, TDS CDMA, UMTS,

CDMA2000

Phased Array Beam Forming Antennas

Software Defined Radio

Tuning Resolution Better than 0.025 Hz

Real or Complex Outputs