Wideband Digital IF Parallel Output
Wideband Digital IF Parallel Input
Allows Cascade of Chips for Additional Channels
Programmable IF and Modulation for Each Channel
Programmable Interpolating RAM Coefﬁcient Filter
High-Speed CIC Interpolating Filter
NCO Frequency Translation
Worst Spur Better than 100 dBc
Tuning Resolution Better than 0.02 Hz
Real or Complex Outputs
Digital Summation of Channels
Clipped or Wrapped Overrange
Two’s Complement or Offset Binary Output
Separate 3-Wire Serial Data Input for Each Channel
JTAG Boundary Scan
Cellular/PCS Base Stations
Micro/Pico Cell Base Stations
Wireless Local Loop Base Stations
Phase Array Beam Forming Antennas
Four-Channel, 75 MSPS Digital
Transmit Signal Processor (TSP)
FUNCTIONAL BLOCK DIAGRAM
CH A SPORT
CH B SPORT
CH C SPORT
CH D SPORT
The AD6622 comprises four identical digital Transmit Signal
Processors (TSPs) complete with synchronization circuitry and
cascadable wideband channel summation. An external digital-
to-analog converter (DAC) is all that is required to complete a
wide band digital up-converter. On-chip tuners allow the relative
phase and frequency for each RF carrier to be independently
Each TSP has three cascaded signal processing elements: a
RAM-programmable Coefﬁcient interpolating Filter (RCF), a
programmable Cascaded Integrator Comb (CIC) interpolating
ﬁlter, and a Numerically Controlled Oscillator/tuner (NCO).
The outputs of the four TSPs are summed and scaled on-chip.
In multichannel wideband transmitters, multiple AD6622s may
be combined using the chip’s cascadable output summation stage.
Each channel provides independent serial data inputs that may
be directly connected to the serial port of DSP chips. User pro-
grammable FIR ﬁlters can be used to ﬁlter linear inputs.
All control registers and coefﬁcient values are programmed through
a generic microprocessor interface. Two microprocessor bus
modes are supported. All inputs and outputs are LVCMOS
compatible. All outputs are LVCMOS and 5 V TTL compatible.
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 2000