|
|
PDF CMX589A Data sheet ( Hoja de datos )
| Número de pieza | CMX589A | |
| Descripción | High-speed GMSK Modem | |
| Fabricantes | Consumer Microcircuits Limited | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de CMX589A (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
|
No Preview Available !
DATA BULLETIN
CMX589A
HIGH-SPEED
GMSK MODEM
PRELIMINARY INFORMATION
Features
Data Rates from 4kbps to 200kbps
Full or Half Duplex Gaussian Filter & Data Recovery
for Minimum Shift Keying (GMSK) Designs
Selectable BT: (0.3 or 0.5)
Low Power
3.0V, 20kbps, 1.5mA typ.
5.0V, 64kbps, 4.0mA typ.
Low Current Non-DSP Solution
Small TSSOP size fits PCMCIA / PC CARDs
Applications
Portable Wireless Data Applications
Cellular Digital Packet Data (CDPD)
Mobitex Mobile Data System
Spread Spectrum Data Links
GPS/Differential GPS Wireless Links
Point of Sale Terminals
Low Power Wireless Data Link for PCs,
Laptops, and Printers
TX ENABLE
TX PS
TX DATA
XTAL/CLOCK
XTAL
ClkDIVA
ClkDIVB
BT
VDD
RXHold
PLLacq
RXDCacq
www.DataSheet4U.com
DATA RETIME &
LEVEL SHIFT
CLOCK
DIVIDER
RX CIRCUIT
CONTROL
VBIAS
TX
FILTER
RX DATA
DETECTION
RX S/N
DETECTION
VBIAS
TX OUT
TX CLK
RX DATA
RX S/N
RX CLOCK
RX CLK
RX PS
RX SIGNAL IN
RX FEEDBACK
VBIAS
+
-
RX
FILTER
RX DC LEVEL
MEASURE
DOC1
DOC2
VSS
VBIAS
The CMX589A is a single-chip synchronous data pump/modem designed for Wireless Data Applications.
Employing Gaussian filtering for Minimum shift Keying (GMSK) baseband modulation applications, the
CMX589A features a wide range of available data rates from 4k to 200kbps. Data Rates and the choice of BT
(0.3 or 0.5) are pin programmable to provide for different system requirements.
The Tx and Rx digital data interfaces are bit serial, synchronized to generated Tx and Rx data clocks.
Separate Tx and Rx Powersave inputs allow full or half-duplex operation. Rx input levels can be set by
suitable AC and DC level adjusting circuitry built with external components around an on-chip Rx Input
Amplifier.
Acquisition, Lock, and Hold of Rx data signals are 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 Processor as required. The Rx S/N
output provides an indication of the quality of the received signal.
The CMX589A may be used with a 3.0V to 5.5V power supply and is available in the following packages:
24-pin TSSOP (CMX589AE2), 24-pin SSOP (CMX589AD5), 24-pin SOIC (CMX589AD2), and 24-pin PDIP
(CMX589AP4).
1998 MX-COM, Inc.
www.mxcom.com Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480183.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1 page  
High Speed GMSK Modem
Pin No.
E2/D5/
D2/P4
23
Signal
Rx S/N
24 VDD
Type
5 CMX589A PRELIMINARY INFORMATION
Description
output
power
A logic level output which may be used as an indication of the quality of
the received signal.
Positive supply. Levels and voltages within the device are dependent
upon this supply. This pin should be bypassed to VSS by a capacitor
mounted close to the pin.
Table 1: Signal List
www.DataSheet4U.com
1998 MX-COM, Inc.
www.mxcom.com Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480183.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
5 Page 
High Speed GMSK Modem
11 CMX589A PRELIMINARY INFORMATION
4.2.5 Rx S/N Detection
The RX S/N Detector system classifies the incoming zero-crossings as GOOD or BAD depending upon the
time when each crossing actually occurs with respect to its expected time as determined by the Clock
Extraction PLL. This information is then processed to provide a logic level output at the RX S/N pin. A high
level indicates a series of GOOD crossings; a low level indicates a BAD crossing.
By averaging this output, it is possible to derive a measure of the Signal-to-Noise-Ratio and hence the
Bit-Error-Rate of the received signal.
10-1
10-2
10-3
BER
10-4
CMX589A BT = 0.3
BT = 1.0 (Theoretical)
10-5
CMX589A BT = 0.5
10-6
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
S/N (dB) [Noise Bandwidth = Bit Rate]
Figure 6: Typical Bit-Error-Rate Performance
www.DataShNeoett4eU:.cFomigure 6 indicates typical performance, independent of bit rate (although the applied noise bandwidth is
considered to match the bit rate used), radio performance (e.g. IF filter distortion), supply voltage (higher bit
rates require VDD 4.5V), and other ‘real world’ factors.”
1998 MX-COM, Inc.
www.mxcom.com Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480183.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet CMX589A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| CMX589A | High-speed GMSK Modem | Consumer Microcircuits Limited |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |