MX589P Просмотр технического описания (PDF) - MX-COM Inc
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MX589P Datasheet PDF : 20 Pages
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High Speed GMSK Modem 4k to 64kbps
7
4 General Description
MX589
4.1 Clock Oscillator Divider
The TX and (nominal) RX data rates are determined by division of the frequency present at the Xtal pin, which may be
generated by the on-chip Xtal oscillator or derived from an external source. Any Xtal/Clock frequency in the range of
1.0MHz to 5.0MHz for VDD = 3.0V, or 1.0MHz to 8.2MHz for VDD = 5.0V may be used, depending on the desired data
rate.
The division ratio is controlled by the logic level inputs on ClkDivA and ClkDivB pins as shown in Table 4, together with an
indication of how various standard data rates may be derived from common µP Xtal frequencies.
Data Rate = Xtal/Clk Frequency
Division Ratio (ClkDiv A/B)
Inputs
ClkDivA ClkDivB
0
0
0
1
1
0
1
1
* VDD ≥ 4.5V
Division Ratio
Xtal Frequency Data Rate
128
256
512
1024
8.192
64000*
32000
16000
8000
Xtal/Clock Frequency (MHz)
4.9152 4.096
2.4576
12.288/3 12.288/5
Data Rate (bps)
38400* 32000
19200
19200 16000
9600
9600
8000
4800
4800
4000
Table 4: Clock/Data Rates
Note: The device operation is not guaranteed above 64kbps or below 4kbps at the relevant supply voltage.
2.048
6.144/3
16000
8000
4000
4.9152MHz
RxD
SERIAL RxC
I/O PORT TxD
TxC
µCONTROLLER
SETTINGS: D/RATE 4800 bps -BT 0.5 - Rx and Tx Enabled
VDD
XTAL/CLOCK
XTAL
Tx Enable
Rx DATA
Rx CLOCK
Tx ClOCK
Tx DATA
PLLacq
RxDCacq
MX589
GMSK MODEM
ClkDIVA
ClkDIVB
BT
RxHOLD
Rx S/N
Tx PS
Rx PS
Figure 4: Minimum µController System Connections
4.2 Receive
4.2.1 Rx Signal Path Description
The function of the RX circuitry is to:
1. Set the incoming signal to a usable level.
2. Clean the signal by filtering.
3. Provide DC level thresholds for clock and data extraction.
4. Provide clock timing information for data extraction and external circuits.
5. Provide RX data in a binary form.
6. Assess signal quality and provide Signal-to-Noise information.
©1998 MX-COM, Inc.
www.mxcom.com Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480103.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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