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AD6623:  104 MSPS, Four-Channel Digital Transmit Signal Processor (TSP)

Product Details

The AD6623 is a four channel Transmit Signal Processor (TSP) that creates high bandwidth data for Transmit Digital-to-Analog Converters (TxDAC®s) 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. The AD6623 synthesizes multi-carrier and multi-standard digital signals to drive these TxDACs. The RAM-based architecture allows easy reconfiguration for multi-mode applications. Modulation, pulse-shaping and anti-imaging filters, static equalization, and tuning functions are combined in a single, cost-effective device. Digital IF signal processing provides repeatable manufacturing, higher accuracy, and more flexibility than comparable high dynamic range analog designs.

The AD6623 is pin compatible to the AD6622 and can operate in AD6622 compatible control register mode.

Each TSP has five cascaded signal processing elements: a programmable interpolating RAM Coefficient Filter (RCF), a programmable Scale and Power Ramp, a programmable 5th order Cascaded Integrator Comb (CIC5) interpolating filter, a flexible 2nd order Re-Sampling Cascaded Integrator Comb filter (rCIC2), and a Numerically Controlled Oscillator/tuner (NCO). The AD6623 has four identical digital TSPs complete with synchronization circuitry and cascadable wideband channel summation. The outputs of the four TSPs are summed and scaled on-chip. In multi-carrier channel wideband transmitters, a bi-directional bus allows the Parallel (wideband) IF Input/Output to drive a second DAC. In this operational mode two AD6623 channels drive one DAC and the other two AD6623 channels drive a second DAC. Multiple AD6623s may be combined by driving the INOUT[17:0] of the succeeding with the OUT[17:0] of the preceding chip. The INOUT[17:0] can alternatively be masked off by software to allow preceding AD6623s outputs to be ignored.

Each channel accepts input data from independent serial ports that may be connected directly to the serial port of Digital Signal Processor (DSP) chips. The AD6623 utilizes a 3.3V I/O power supply and a 2.5V core power supply. All I/O pins are 5V tolerant. All control registers and coefficient values are programmed through a generic microprocessor interface. Intel and Motorola microprocessor bus modes are supported. All inputs and outputs are LVCMOS compatible.


  • RAM Coefficient Filter (RCF)
    Programmable IF And Modulation For Each Channel
    Programmable Interpolating RAM Coefficient Filter
    p/4 DQPSK Differential Phase Encoder
    3p/8 8-PSK Linear Encoder
    8-PSK Linear Encoder
  • Programmable GMSK Look-Up Table
    Programmable QPSK Look-Up-Table
    All-Pass Phase Equalizer
    Programmable Fine Scalar
    Programmable Power Ramp Unit
  • 18-Bit Parallel Digital IF Output
  • 18-Bit Bi-Directional Parallel Digital
    IF Input/Output
    Allows Cascade Of Chips For Additional Channels
  • Four Independent Digital Transmitters In Single Package
  • Digital Re-Sampling For Non-Integer
    Decimation Rates

Functional Block Diagram for AD6623


Title Content Type File Type
AD6623: 4-Channel, 104 MSPS Digital Transmit Signal Processor (TSP) Data Sheet  (Rev A, 09/2002) (pdf, 929 kB) Data Sheets PDF
AN-835: Understanding High Speed ADC Testing and Evaluation  (pdf, 985 kB) Application Notes PDF
AN-851: A WiMax Double Downconversion IF Sampling Receiver Design  (pdf, 262 kB) Application Notes PDF
Introducing Digital Up/Down Converters: VersaCOMM™ Reconfigurable Digital Converters  (pdf, 63 kB)
Revolutionize your radio architectures
Technical Articles PDF
Digital Up/Down Converters: VersaCOMM™ White Paper  (pdf, 97 kB) Technical Articles PDF
Basics of Designing a Digital Radio Receiver (Radio 101)  (pdf, 77 kB) Technical Articles PDF
Smart Partitioning Eyes 3G Basestation
by Brad Brannon and Paul Henricks, Analog Devices, Inc. (EE Times, 10/18/02)
Technical Articles HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD6623 IBIS Models IBIS Models HTML

Evaluation Kits & Symbols & Footprints

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Price, packaging, availability

AD6623 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD6623ABC Status: Obsolete 196 ball CSPBGA (1.70mm thick) 196 Ind Tray, 126 - - N  Material Info Notify Me Contact ADI
AD6623ABCZ Status: Obsolete 196 ball CSPBGA (1.70mm thick) 196 Ind Tray, 126 - - Y  Material Info Notify Me Contact ADI
AD6623AS Status: Obsolete 128 ld MQFP (14x20mm) 128 Ind Tray, 66 - - N  Material Info Notify Me Contact ADI
AD6623ASZ Status: Production 128 ld MQFP (14x20mm) 128 Ind Tray, 66 $31.12 $26.45 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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