MX589 Consumer Microcircuits Limited, MX589 Datasheet
MX589
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MX589 Summary of contents
Page 1
... The Rx S/N output provides an indication of the quality of the received signal. The MX589 may be used with a 3.0V to 5.5V power supply and is available in the following packages: 24-pin TSSOP (MX589TN), 24-pin SOIC (MX589DW), and 24-pin PDIP (MX589P). ...
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... MXCOM, Inc. reserves the right to change specifications at any time without notice. ©2001 MX-COM, Inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Page Contents All trademarks and service marks are held by their respective companies. MX589 Page Doc. # 204800103.011 ...
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... All trademarks and service marks are held by their respective companies BIAS BIAS TX TX OUT FILTER TX CLK RX DATA RX DATA DETECTION RX S/N RX S/N DETECTION RX CLK RX CLOCK LEVEL BIAS MEASURE DOC1 DOC2 Frequency Modulator Signal and DC Level Adjustment TX Out TX Out Filter Doc. # 204800103.011 MX589 ...
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... XTAL used, it should be connected to this pin and the unconnected. Note: Operation of the MX589 without a suitable Xtal or clock input may cause device damage. Logic level inputs control the internal clock divider and therefore, the transmit and receive data rate. See Table 4. ...
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... RX PSAVE 8 V BIAS SIGNAL Tolerance Component ±5% C4 ±10% C5 ±10% C6 ±10% C7 ±10 All trademarks and service marks are held by their respective companies. MX589 S TXCLK 22 RXCLK 21 RXDATA 20 TXDATA 19 TXPSAVE 18 TXENABLE 17 R1 TXOUT DOC1 ...
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... C7 and C8 should both be .015μF for a data rate of 8kbps, and inversely proportional to the data rate for other data rates, e.g. .030μF at 4kbps, 1800pF at 64kbps. 5. The MX589 can operate correctly with the Xtal/Clock frequencies between 1.0MHz and 8.2MHz (V 5.0V) and 1.0MHz to 5.0MHz (V design should drive the clock inverter input with signal levels of at least 40 fork crystals generally cannot meet this requirement ...
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... All trademarks and service marks are held by their respective companies. = 5.0V may be used, DD A/B) 4.096 2.4576 2.048 12.288/3 12.288/5 6.144/3 Data Rate (bps) 32000 19200 16000 16000 9600 8000 8000 4800 4000 4000 Enable ClkDIVA MX589 ClkDIVB BT RxHOLD Rx S Doc. # 204800103.011 MX589 ...
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... High Speed GMSK Modem 4k to 64kbps The output of the radio receiver's Frequency Discriminator should be fed to the MX589's RX Filter by a suitable gain and DC level adjusting circuit. This circuit can be built with external components around the on- chip RX Input Amplifier. The gain should be set so that the signal level at the RX Feedback pin is nominally 1V peak to peak (for V =5 ...
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... The capacitor charging circuits are disabled so that the outputs of the voltage detectors remain substantially at the last readings (discharging very slowly [time-constant approx. 2,000 bits] towards V BIAS ). All trademarks and service marks are held by their respective companies. Rx HOLD Input is a logic 1 and Rx HOLD to operate in one of four Doc. # 204800103.011 MX589 ...
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... Figure 7: Typical Rx S/N Output High time (%) vs. Input S/N ©2001 MX-COM, Inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Page MX589 BT = 0.3 MX589 S/N (dB) [Noise Bandwidth = Bit Rate ...
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... The actual filter bandwidth to be used in any particular application will be determined by the overall system requirements. The attenuation- vs. -frequency response of the transmit filtering provided by the MX589 has been designed to meet the specifications for most GMSK modem systems that are -3dB bandwidth switchable between 0 ...
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... Bethania Station Road, Winston-Salem, NC 27105-1201 USA Page 0.3 Frequency/Bitrate 0.1 Figure 9: Tx Filter Response BT = 0.5 1.0 Frequency/Bitrate All trademarks and service marks are held by their respective companies. MX589 . 0.5 2.0 Doc. # 204800103.011 ...
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... Data Formats The receive section of the MX589 works best with data which has a reasonably random structure --the data should contain approximately the same number of ‘ones’ as ‘zeroes’ with no long sequences (>100 bits) of consecutive ones or zeroes. Also, long sequences (>100 bits) of 10101010 ... patterns should be avoided. ...
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... Accuracy of the Tx and Rx carrier frequencies -any difference will shift the received signal towards one of the skirts of the IF filter response. Ideally, the Rx demodulator should be DC coupled to the MX589 RX Signal In pin (with a DC bias added to center the signal at the RX Feedback pin at V The 3dB cut-off frequency is 20Hz or below (i.e. a 0.1μF capacitor in series with 100kΩ). ...
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... This is both to prevent the radio's PLL circuitry from counteracting the modulation process, and to provide a clean flat modulation response down to DC. Figure 12 shows a suggested basic configuration to provide a two-point modulation drive from the MX589 TX Output using MX-COM's MX019 Digitally Controlled Quad Amplifier Array. The MX019 elements provide individual set-up, calibration and dynamic control of modulation levels ...
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... AC Coupling of Tx and Rx Signals In practical applications possible to arrange AC coupling between the MX589 Tx Output and the frequency modulator to cut-off at a very low frequency, such as 5.0Hz. AC coupling between the receive discriminator and the input of the MX589 may need a shorter time-constant to avoid problems from voltage steps at the output of the discriminator when changing channels or when the distant transmitter turns on. For these reasons, as well as to maintain reasonable BER, the optimum – ...
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... All trademarks and service marks are held by their respective companies. Typ. Max. Units 7 0 800 13 mW/°C above 25°C 85 125 550 9 mW/°C above 25°C 85 125 Typ. Max. Units 5 kbps 64 kbps 5.0 MHz 10.3 MHz Doc. # 204800103.011 MX589 °C °C mW °C °C V ° ...
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... Table 8: Operating Characteristics All trademarks and service marks are held by their respective companies. Min. Typ. Max. Units 0.5 mA 1.0 mA 1.0 mA 1.5 mA 1.0 mA 2.0 mA 3.0 mA 4.0 mA 3.5 V 1.5 V μA -5.0 5.0 4.6 V 0.4 V 1.0 kΩ 0.8 1.0 1.2 V P-P -0.125 0.125 V 2.0 2.5 bit-periods 1.5 2.0 bit-periods 4.0 bit-periods 1.0 MΩ 10.0 KΩ 50.0 dB 0.7 1.0 1.3 V P-P 3.0 bit-periods 10.0 MΩ 50.0 kΩ 25.0 dB Doc. # 204800103.011 MX589 ...
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... High Speed GMSK Modem 4k to 64kbps Operating Characteristics Notes: 1. Not including current drawn from the MX589 pins by external circuitry. See Absolute Maximum Ratings. 2. For V in the range For a load of 10KΩ or greater input at logic 0; Tx Enable = 1. 4. Data pattern of 1111000011110000… ...
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... High Speed GMSK Modem 4k to 64kbps A PIN1 Figure 17: 24-pin PDIP Mechanical Outline: Order as part no. MX589P ©2001 MX-COM, Inc. www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Page ...