1

Modem Reference

Designs

The ISL837030 and ISL83740 Broadband Wireless Modem

Reference Designs support a wide range of modulation

orders and symbol rates.*

In both Reference Designs, sophisticated coding,

equalization, and symbol recovery techniques are employed,

resulting in robust wireless link performance.

The ISL837030 and ISL83740 Reference Designs support

high-capacity digital microwave radios with data rates up to

238Mbps (ISL83740) and 160Mbps (ISL837030). They

provide a flexible, high performance, economical solution for

fixed wireless applications.

* Differences between the ISL837030 and ISL83740 are marked in text as

needed. Also see Release Notes on page 25.

Benefits

• Eliminates the need to develop custom ASICs

• Optimizes wireless link capacity and Bit Error Rate (BER)

performance

• Enables rapid prototyping and compliance testing

• Proven technology

• Optional Evaluation Kit supports demo requirements,

performance evaluation, and lab testing

Features

• Programmable modulation

Both: QPSK, 8PSK, 16QAM, 32QAM

ISL83740 only: 64QAM, 128QAM

• Flexible data rates

ISL83740: up to 238Mbps

ISL837030: up to 160Mbps

• Programmable symbol rates

• Reed Solomon (RS) encoding/decoding

• Concatenated coding using RS and PTCM inner code

• FCC and ETSI spectral mask compliance

• Powerful equalization

Includes

• Sample ISL87060MIK Modulator and ISL87060DIK

Demodulator Chip Sets for development and test.

• Complete Manufacturing Documentation Package: Bill of

Materials, Schematics, PCBA Fabrication Files, including

Gerber Files.

• Test Documentation.

• Embedded Monitor and Control Software provides

comprehensive setup and test capabilities. Accepts

commands in binary or ASCII format.

Optional Evaluation Kit

The modem PCBA is mounted on an Evaluation Platform,

allowing the modem to be set up and tested in a standard lab

environment. Includes VHF and L-band IF Interfaces and a

sophisticated Graphical User Interface for Windows



operating systems. (ISL83700EVAL/ISL83740EVAL)

FIGURE 1 Simplified Block Diagram

DAC

LPF

Differential

Baseband

Outputs

Baseband

Loopback

ISL87060DIK

Demodulator/

Decoder

ADC

LPF

Decimating

Matched

Filter

Controller

ASYNC

Serial

Data

Data

Differential

Baseband

Inputs

Level

Offset

FLASH

TrimDAC

ISL87060MIK

Modulator/

Encoder

Modem PCBA

May 2002

Datasheet

ISL837030, ISL83740

FN8013.5

®

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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