MX589 データシートの表示（PDF） - CML Microsystems Plc
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MX589 Datasheet PDF : 21 Pages
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High Speed GMSK Modem 4k to 64kbps
Page 7 of 20
MX589
4 General Description
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*
19200
9600
4800
32000
16000
8000
4000
19200
9600
4800
Table 4: Clock/Data Rates
2.048
6.144/3
16000
8000
4000
Note: The device operation is not guaranteed above 64kbps or below 4kbps at the relevant supply voltage.
4.9152MHz
SETTINGS: D/RATE 4800 bps -BT 0.5 - Rx and Tx Enabled
VDD
XTAL/CLOCK
XTAL
Tx Enable
RxD
SERIAL RxC
I/O PORT TxD
TxC
µCONTROLLER
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.
2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 204800103.011
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
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