CMX909BP4 datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > Wireless rf/communication> Telecom circuit> CMX909BP4

CMX909BP4: DescriptionModem, 38.4kbps Data, PDIP24, PLASTIC, DIP-24; CategoryWireless rf/communication Telecom circuit; File Size560KB，43 Pages; ManufacturerMx Com Inc

Download Datasheet Parametric Compare View All

CMX909BP4 Overview

Modem, 38.4kbps Data, PDIP24, PLASTIC, DIP-24

CMX909BP4 Parametric

Parameter Name	Attribute value
Maker	Mx Com Inc
Parts packaging code	DIP
package instruction	,
Contacts	24
Reach Compliance Code	unknow
data rate	38.4 Mbps
JESD-30 code	R-PDIP-T24
Number of functions	1
Number of terminals	24
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
Package shape	RECTANGULAR
Package form	IN-LINE
Certification status	Not Qualified
Nominal supply voltage	3 V
surface mount	NO
Telecom integrated circuit types	MODEM
Temperature level	INDUSTRIAL
Terminal form	THROUGH-HOLE
Terminal location	DUAL

Preview

Download Datasheet

View All

COMMUNICATION SEMICONDUCTORS

CMX909B

GMSK

Packet Data Modem

DATA BULLETIN

FEATURES and APPLICATIONS

•

GMSK Modulation/Demodulation

Rx or Tx up to 38.4kbits/sec

Full and Short Data Packet Framing

Mobitex Compatible including

R14N Short Block Frames

Envelope/End of Packet Detector for

’continuously keyed carrier’ systems

•

On-chip Packet Detection

Parallel Host Processor Interface

Low Power 3.0V/5.0V Operation

Flexible Operating and Powersave Modes

Add Frame

Header

CMX909B

HOST µC

Scramble

Data

Interleave

Data

FEC & CRC

Encoding

Data

Buffer

DATA AND

CONTROL

BUS

RADIO

ANALOG Tx

GMSK

Modulator

MODULATOR

DISCRIMINATOR

ANALOG Rx

GMSK

Demodulator

Descramble

Data

Deinterleave

Data

FEC & CRC

Decoding

SYSTEM

APPLICATION

PROCESSING

Frame Sync.

and Data

Detection

GMSK MODEM

The CMX909B is a half-duplex Gaussian Minimum Shift Keyed (GMSK) BT=0.3 modem data pump with on-

chip packet data handling. GMSK modulation optimizes the data throughput for a given bandwidth RF

channel and the on-chip packet data handling relieves the host µC of regular processing tasks, such as

maintaining Bit and Frame Synchronization, Block Formatting, CRC and FEC Error Processing, Data

Interleaving and Scrambling. The demodulator uses decision feedback equalization techniques to reduce the

channel distortion effects and enhance the receiver performance without the computational overhead of

maximum likelihood (Viterbi) estimation methods.

The CMX909B is pin, function and software backwards compatible with the FX909A and MX909A modems

and also uses the same external components. It offers improved performance, higher data rates, lower

voltage operation, support for the recent R14N extension to Mobitex for short block frames, and an

Envelope/End of Packet detector to facilitate frame start detection in ‘continuously keyed carrier’ systems.

The CMX909B also offers 2-strength XTAL driver circuitry – for wider choice of XTALs, optional zero-error or

one-error frame sync. detection, multiple powersave options – for intelligent power management, and

availability in small 24-pin TSSOP and SSOP package options.

The CMX909B is ideally suited to wireless data applications such as Mobitex terminals, wireless telemetry,

license-free radio data and ISM band radio schemes.

Mobitex

is a trademark of Telia AB, Sweden

2001 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480226.001

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

All trademarks and service marks are held by their respective companies.

GMSK Packet Data Modem

2 of 43

CMX909B Advance Information

CONTENTS

Section

Page

1. Block Diagram ............................................................................................................... 4

2. Signal List ...................................................................................................................... 5

3. External Components ................................................................................................... 6

4. General Description ...................................................................................................... 7

4.1

Description of Blocks ......................................................................................................... 7

4.1.1

4.1.2

4.1.3

4.1.4

4.1.5

4.1.6

4.1.7

4.1.8

4.1.9

Data Bus Buffers..................................................................................................................... 7

Address and R/W Decode ...................................................................................................... 7

Status and Data Quality Registers.......................................................................................... 7

Command, Mode and Control Registers ................................................................................ 7

Data Buffer.............................................................................................................................. 7

CRC Generator/Checker ........................................................................................................ 7

FEC Generator/Checker ......................................................................................................... 7

Interleave/De-interleave Buffer ............................................................................................... 7

Frame Sync Detect ................................................................................................................. 8

4.1.10 Rx I/P Amp.............................................................................................................................. 8

4.1.11 Tx/Rx Low Pass Filter ............................................................................................................. 8

4.1.12 Tx Output Buffer...................................................................................................................... 8

4.1.13 Rx Level/Clock Extraction....................................................................................................... 9

4.1.14 Clock Oscillator and Dividers.................................................................................................. 9

4.1.15 Scramble/De-scramble ........................................................................................................... 9

4.2

4.3

Modem - µC Interaction ................................................................................................... 10

Data Formats ................................................................................................................... 11

4.3.1

General Purpose Formats .................................................................................................... 11

Mobitex Frame Structure ................................................................................................ 11

4.3.1.1

4.4

The Programmer’s View................................................................................................... 12

4.4.1

4.4.2

Data Buffer............................................................................................................................ 12

Command Register ............................................................................................................... 13

Command Register B7: AQBC - Acquire Bit Clock ........................................................ 13

Command Register B6: AQLEV - Acquire Receive Signal Levels ................................. 13

Command Register B5: - EOP End of Packet Detector ................................................ 14

Command Register B4: - ENV Envelope Detector........................................................ 14

Command Register B3, B2, B1, B0: TASK - Task ......................................................... 15

Control Register B7, B6: CKDIV - Clock Division Ratio ................................................. 22

B5:

HI/LO

- Xtal Range Selection ................................................................................. 22

Control Register B4: DARA - Data Rate and Mode Register B0 - HIBW ....................... 22

Control Register B3, B2: LEVRES - Level Measurement Response Time .................... 23

Control Register B1, B0: PLLBW ................................................................................... 23

4.4.2.1

4.4.2.2

4.4.2.3

4.4.2.4

4.4.2.5

4.4.3

4.4.3.1

4.4.3.2

4.4.3.3

4.4.3.4

4.4.3.5

Control Register .................................................................................................................... 22

2001 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480226.001

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

All trademarks and service marks are held by their respective companies.

GMSK Packet Data Modem

3 of 43

CMX909B Advance Information

4.4.4

Mode Register....................................................................................................................... 23

Mode Register B7:

IRQ EN

IRQ

Output Enable ........................................................ 23

Mode Register B6: INVBIT - Invert Bits.......................................................................... 24

Mode Register B5:

TX/RX

- Tx/Rx Mode...................................................................... 24

Mode Register B4: SCREN - Scramble Enable ............................................................. 24

Mode Register B3: PSAVE - Powersave........................................................................ 24

Mode Register B2: DQEN - Data Quality IRQ Enable ................................................... 24

Mode Register B1: HIXTL - High Xtal Drive ................................................................... 24

Mode Register B0: HIBW - High Filter Bandwidth.......................................................... 24

Status Register B7: IRQ - Interrupt Request .................................................................. 25

Status Register B6: BFREE - Data Buffer Free ............................................................. 25

Status Register B5: IBEMPTY - Interleave Buffer Empty............................................... 25

Status Register B4: DIBOVF - De-Interleave Buffer Overflow ....................................... 26

Status Register B3: CRCFEC - CRC or FEC Error ........................................................ 26

Status Register B2: DQRDY - Data Quality Reading Ready ......................................... 26

Status Register B1:

MO/BA

- Mobile or Base Bit Sync Received ................................ 26

Status Register B0: EOP/ENV - End of Packet/Envelope Detect .................................. 26

4.4.4.1

4.4.4.2

4.4.4.3

4.4.4.4

4.4.4.5

4.4.4.6

4.4.4.7

4.4.4.8

4.4.5

4.4.5.1

4.4.5.2

4.4.5.3

4.4.5.4

4.4.5.5

4.4.5.6

4.4.5.7

4.4.5.8

4.4.6

Status Register ..................................................................................................................... 25

Data Quality Register............................................................................................................ 27

CRC ...................................................................................................................................... 28

FEC....................................................................................................................................... 28

Interleaving ........................................................................................................................... 29

Scrambling ............................................................................................................................ 30

4.5

CRC, FEC, Interleaving and Scrambling Information: ...................................................... 28

4.5.1

4.5.2

4.5.3

4.5.4

5. Application Notes........................................................................................................ 30

5.1

5.2

5.3

5.4

5.5

6.1

Transmit Frame Example................................................................................................. 30

Receive Frame Example.................................................................................................. 32

Clock Extraction and Level Measurement Systems.......................................................... 34

AC Coupling..................................................................................................................... 36

Radio Performance .......................................................................................................... 37

Electrical Performance..................................................................................................... 38

6.1.1

6.1.2

6.1.3

6.1.4

Absolute Maximum Ratings .................................................................................................. 38

Operating Limits.................................................................................................................... 38

Operating Characteristics ..................................................................................................... 39

Timing Diagrams................................................................................................................... 40

6. Performance Specification ......................................................................................... 38

6.2

Packaging........................................................................................................................ 42

MX-COM, Inc. reserves the right to change specifications at any time and without notice.

2001 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480226.001

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

All trademarks and service marks are held by their respective companies.

CMX909BP4 Related Products

	CMX909BP4	CMX909BD5	CMX909BE2
Description	Modem, 38.4kbps Data, PDIP24, PLASTIC, DIP-24	Modem, 38.4kbps Data, PDSO24, SSOP-24	Modem, 38.4kbps Data, PDSO24, TSSOP-24
Maker	Mx Com Inc	Mx Com Inc	Mx Com Inc
Parts packaging code	DIP	SSOP	TSSOP
Contacts	24	24	24
Reach Compliance Code	unknow	unknow	unknow
data rate	38.4 Mbps	38.4 Mbps	38.4 Mbps
JESD-30 code	R-PDIP-T24	R-PDSO-G24	R-PDSO-G24
Number of functions	1	1	1
Number of terminals	24	24	24
Maximum operating temperature	85 °C	85 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C	-40 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	IN-LINE	SMALL OUTLINE	SMALL OUTLINE
Certification status	Not Qualified	Not Qualified	Not Qualified
Nominal supply voltage	3 V	3 V	3 V
surface mount	NO	YES	YES
Telecom integrated circuit types	MODEM	MODEM	MODEM
Temperature level	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
Terminal form	THROUGH-HOLE	GULL WING	GULL WING
Terminal location	DUAL	DUAL	DUAL

Recommended Resources

Do you know the possible reasons why the power adapter cannot be used universally?

TDA6107 color TV amplifier application circuit

IGBT working principle diagram

MAX1628-2A buck converter circuit diagram

Phototransistor pulse input circuit

push-pull oscillator circuit

About the problem of not finding coredll.lib when using platform builder to compile: Hello everyone, I am a newbie who just started to use wince for development. I use platform builder for development. The hardware is a qq2440 board. I added a stream driver dynamic link library on it,...; michael_tju Embedded System

The system cannot be suspended normally (sleep/suspend)---------- If you can help solve it, you can settle it in RMB: WinCE 6.0 can be suspended and woken up in normal mode, but when I use multi-bin XIP, it stops halfway through the suspend process. Why is this? Please help!...; lvjg Embedded System

[Microchip Live Review] How to use Microchip security solutions to protect IoT devices (including ppt, QA): [font=微软雅黑][size=3]Live Date: December 6, 2018 Live Topic: [color=#333333]How to use Microchip security solutions to protect IoT devices[/color] Live Replay: [url=https://training.eeworld.com.cn/video...; EEWORLD社区 RF/Wirelessly

WINCE5.0 development board: The company needs to buy a development board. The requirement is WINCE5.0, with HDD interface and multimedia processing function. I have been looking for two days, but I can't find a suitable one. The...; heyuqi Embedded System

Can anyone give me some suggestions on designing a creative device with a USB interface?: I want to design a creative little device with USB interface, which can realize a meaningful function, not too difficult, nor too easy to do (haha, this seems difficult to do), so I thought about it f...; zhiguodu Embedded System

Please help me, sim300 is used as server, the client can't connect: Now set sim300 as a server through the serial port, such as: AT+CIPCSGP=1,"cmnet" AT+CLPORT="TCP","2020" 'Set the local port AT+CIPSERVER 'Return SERVER OK AT+CIFSR 'Get the local IP, return 10.59.85....; Embedtech Embedded System

Shortcut: S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 SA SB SC SD SE SF SG SH SI SJ SK SL SM SN SO SP SQ SR SS ST SU SV SW SX SY SZ T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 TA TB TC TD TE TF TG TH TI TJ TK TL TM TN TO TP TQ TR TS TT TU TV TW TX TY TZ U0 U1 U2 U3 U4 U6 U7 U8 UA UB UC UD UE UF UG UH UI UJ UK UL UM UN UP UQ UR US UT UU UV UW UX UZ V0 V1 V2 V3 V4 V5 V6 V7 V8 V9 VA VB VC VD VE VF VG VH VI VJ VK VL VM VN VO VP VQ VR VS VT VU VV VW VX VY VZ W0 W1 W2 W3 W4 W5 W6 W7 W8 W9 WA WB WC WD WE WF WG WH WI WJ WK WL WM WN WO WP WR WS WT WU WV WW WY X0 X1 X2 X3 X4 X5 X7 X8 X9 XA XB XC XD XE XF XG XH XK XL XM XN XO XP XQ XR XS XT XU XV XW XX XY XZ Y0 Y1 Y2 Y4 Y5 Y6 Y9 YA YB YC YD YE YF YG YH YK YL YM YN YP YQ YR YS YT YX Z0 Z1 Z2 Z3 Z4 Z5 Z6 Z8 ZA ZB ZC ZD ZE ZF ZG ZH ZJ ZL ZM ZN ZP ZR ZS ZT ZU ZV ZW ZX ZY

Popular Components