PDF預(yù)覽

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12

CML Semiconductor Products

PRODUCT INFORMATION

FX489

Features

GMSK Modem

Obsolete Product - For Information Only

Full-Duplex Gaussian Minimum

Shift Keying

Selectable BT (0.3 or 0.5)

Meets RAM - MOBITEX Specification

Data Rates From 4000bits/s to

19200bits/s

Serial Rx and Tx Data Interfaces

Tx ENABLE

Tx PS

Tx DATA

V

BIAS

Rx and Tx Data Clock Generation

Rx Signal Tracking Controls

Rx S/N Indication

Separate Rx and Tx Powersave

Inputs

Wireless Modem, Radio Telemetry

and Data Terminal Applications

V

BIAS

XTAL/CLOCK

DATA RETIME

&

LEVEL SHIFT

Tx

FILTER

Tx OUT

Tx CLOCK

XTAL

ClkDIVA

ClkDIVB

CLOCK

DIVIDER

Rx DATA

EXTRACT

Rx DATA

BT

V

DD

Rx S/N

DETECTION

Rx S/N

FX489

NEW

40kbps

Modem

FX589

Pin/Function

Compatible

RxHold

PLLacq

RxDCacq

Rx PS

Rx CIRCUIT

CONTROL

Rx CLOCK

EXTRACT

Rx CLOCK

V

BIAS

V

SS

Rx SIGNAL IN

Rx FEEDBACK

+

-

Rx

FILTER

Rx LEVEL

MEASURE

V

BIAS

DOC1

DOC2

Fig.1 Functional Block Diagram

Brief Description

The FX489 is a single-chip modem employing

Gaussian Minimum Shift Keying (GMSK) modulation.

Having a pin selectable BT of 0.3 or 0.5, the FX489

may be employed at data rates of between 4,000bits/s

and 19,200bits/s; for use in FM radio-data links and

data communication systems conforming to DOC and

FCC spectrum limitations for 12.5kHz and 8,000 baud

at a BT of 0.3, and 12.5, 25.0, and 50.kHz channel

spacing and data rates of 4800, 9600 and 19,200

baud respectively at a BT of 0.5.

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 a.c. and

d.c. 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 碌Processor as required.

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

to the quality of the received signal.

The FX489, a low-power CMOS microcircuit, is

available in both 24-pin plastic Small Outline (S.O.I.C)

and DIL packages.

1

next

FX489P相關(guān)型號(hào)PDF文件下載

• 型號(hào)
  版本
  描述
  廠商
  下載
• FX489
  英文版
  GMSK Modem
  ETC
  FX489
• FX489
  英文版
  GMSK Modem
  ETC [ETC]
  FX489
• FX489P
  英文版
  GMSK Modem
  ETC
  FX489P
• FX489P
  英文版
  GMSK Modem
  ETC [ETC]
  FX489P
• FX489DW
  英文版
  GMSK Modem
  ETC
  FX489DW
• FX489DW
  英文版
  GMSK Modem
  ETC [ETC]
  FX489DW

您可能感興趣的PDF文件資料

• FX489
• FX489P
• FX489P
• FX489DW
• FX489DW
• FX489

熱門IC型號(hào)推薦

• FQPF2N60C
• FDN357N-NL
• FMMT451TA
• FDG6304P
• FDS8433A
• FQP8N60C
• FDC6312P
• FMC2A
• FDG6331L
• FMS6502MTC24X
• FPF1005
• FDMC7672S