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CML Semiconductor Products

PRODUCT INFORMATION

FX589

Features

Full-Duplex Gaussian Minimum

Shift Keying (GMSK)

Operating from 3 Volts to 5.5 Volts

Data Rates 4kb/s to 64kb/s

Selectable BT (0.3 or 0.5)

Low-Current Analogue/Digital

Non-DSP Solution

Meets RCR STD-18

Tx ENABLE

Tx PS

Tx DATA

V

BIAS

Low-Voltage/High-Speed

GMSK Modem

Publication D/589/7 January 1998

Applications

Wireless LAN/Modems

Handy Data Terminals

Low-Power Wireless Data Link

for PCs, Laptops and Printers

Point-Of-Sale Terminals

Wireless Bar-Code Readers

and Stock Controllers

V

BIAS

DATA RETIME

&

LEVEL SHIFT

Tx

FILTER

Tx OUT

XTAL/CLOCK

Tx CLOCK

XTAL

ClkDIVA

ClkDIVB

CLOCK

DIVIDER

Rx DATA

EXTRACT

Rx DATA

BT

Rx S/N

DETECTION

Rx S/N

FX589

RxHold

PLLacq

RxDCacq

Rx PS

Rx CIRCUIT

CONTROL

Rx CLOCK

EXTRACT

Rx CLOCK

V

DD

V

BIAS

Rx SIGNAL IN

+

-

Rx

FILTER

Rx LEVEL

MEASURE

V

SS

V

BIAS

Rx FEEDBACK

DOC1

DOC2

Fig.1 Functional Block Diagram

Brief Description

The FX589 is a single-chip modem employing

Gaussian Minimum Shift Keying (GMSK) modulation.

Data rates of 4kb/s to 64kb/s and the choice of BT

to 0.3 or 0.5 are pin-programmable functions to suit

radio data channel bandwidth requirements.

The Rx and Tx digital data interfaces are bit-serial

and synchronised to Rx and Tx data clocks generated

by the modem. Separate Rx and Tx Powersave/Enable

inputs allow for full- or half-duplex operation.

Rx input levels can be set by a suitable ac and dc

level adjusting circuit built, with external components,

around an on-chip Rx input amplifier.

Acquisition, lock and hold of Rx data signals is made

easier and faster by the use of Rx Control Inputs to clamp,

detect and/or hold input data levels and can be set by the

system 碌Processor as required.

Indication is available, from the Rx S/N output, as to the

quality of the received signal.

The FX589 design features a low-current analogue/digital

ASIC process offering significantly lower current

consumption than DSP technology. For data rates up to

32kb/s the FX589 draws typically 1.5mA at 3.0 volts V

DD

and

for data rates up to 64kb/s at 5.0 volts, typically 4.0mA.

This low-power CMOS microcircuit is available in both

24-pin plastic DIL and Small Outline (SOIC and SSOP)

packages.

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