CIRCUIT DESIGN LMD-400-R Operation Manual Download Page 8 | Manualshive

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OPERATION GUIDE

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OG_LMD-400-R-AB_v11e Circuit Design, Inc.

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BLOCK DIAGRAM

<LMD-400-R 438-442 MHz /458-462 MHz>

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Summary of Contents for LMD-400-R

Page 1: ...multi channel transceiver LMD 400 R 438 442 458 462 MHz Operation Guide Version 1 1 Sep 2011 CIRCUIT DESIGN INC 7557 1 Hotaka Azumino Nagano 399 8303 JAPAN Tel 81 0 263 82 1024 Fax 81 0 263 82 1016 e...

Page 2: ...PIN DESCRIPTION 6 BLOCK DIAGRAM 8 DIMENSIONS 9 PLL IC CONTROL 10 PLL IC control 10 How to calculate the setting values for the PLL register 11 Method of serial data input to the PLL 12 TIMING CHART 1...

Page 3: ...high frequency stability in the temperature range from 20 to 60 C The LMD 400 R is the same size and pin compatible with Circuit Design s EN 300220 compliant license exempt transceiver model STD 302N...

Page 4: ...Item MIN TYP MAX Remarks Oscillation type PLL controlled VCO Frequency stability 20 to 60 C ppm 2 5 2 5 Reference frequency at 25 C TX RX switching time ms 15 20 DI DO Channel step kHz 12 5 Data rate...

Page 5: ...e DO is established may get longer due to the possible frequency drift caused by operation environment changes especially when switching from TX to RX from RX to TX and changing channels Please make s...

Page 6: ...D and RXSEL to OPEN or 2 8 V RXSEL I RX select terminal GND RXSEL active To enable the receiver circuits connect RXSEL to GND and TXSEL to OPEN or 2 8 V AF O Analogue output terminal There is DC offse...

Page 7: ...erminal Lock H 2 8 V Unlock L 0 V RSSI O Received Signal Strength Indicator terminal DO O Data output terminal Interface voltage H 2 8V L 0V DI I Data input terminal Interface voltage H 2 8V to Vcc L...

Page 8: ...OPERATION GUIDE OG_LMD 400 R AB_v11e Circuit Design Inc 8 BLOCK DIAGRAM LMD 400 R 438 442 MHz 458 462 MHz...

Page 9: ...OPERATION GUIDE OG_LMD 400 R AB_v11e Circuit Design Inc 9 DIMENSIONS...

Page 10: ...e frequency These signal lines are connected directly to the PLL IC through a 2 k resistor The interface voltage of LMD 400 R is 2 8 V so the control voltage must be the same LMD 400 R comes equipped...

Page 11: ...note fcomp fosc R Also this PLL IC operates with the following R N A and M relational expressions R fosc fcomp Equation 5 N INT n M Equation 6 A n M x N Equation 7 INT integer portion of a division As...

Page 12: ...t this phase The PLL IC which operates as shown in the block diagram in the manual shifts the data to the 19 bit shift register and then transfers it to the respective latch counter register by judgin...

Page 13: ...ssion occurs If the module is switched to the receive mode when operating in the same channel a new PLL setting is not necessary it can receive data within 5 ms of switching 1 For data transmission if...

Page 14: ...nged 5 ms 4 40 ms CPU Power on CH Data 5 5 ms 5 ms Check LD signal Check LD signal Normal status Status immediately after pow er comes on Channel change No channel change 4 2 Initialize the port conne...

Page 15: ...875 34919 545 39 458 2000 436 5000 436 5000 34920 545 40 458 2125 436 5125 436 5125 34921 545 41 458 2250 436 5250 436 5250 34922 545 42 458 2375 436 5375 436 5375 34923 545 43 458 2500 436 5500 436 5...

Page 16: ...34942 545 62 458 4875 436 7875 436 7875 34943 545 63 458 5000 436 8000 436 8000 34944 546 0 458 5125 436 8125 436 8125 34945 546 1 458 5250 436 8250 436 8250 34946 546 2 458 5375 436 8375 436 8375 349...

Page 17: ...s the LMD 400 R should be mounted on the circuit boards of the final products and must be enclosed in the cases of the final products No surface of the LMD 400 R should be exposed Conformity assessmen...

Page 18: ...OG_LMD 400 R AB_v11e Circuit Design Inc 18 OPERATION GUIDE Regulatory compliance information...

Page 19: ...ipment connected to the radio module Communication performance will be affected by the surrounding environment so communication tests should be carried out before actual use Ensure that the power supp...

Page 20: ..._LMD 400 R AB_v11e Circuit Design Inc 20 OPERATION GUIDE REVISION HISTORY Version Date Description Remark 0 9 Jan 2010 Preliminary 1 0 May 2010 DOC added specification reviewed 1 1 Sept 2011 DOC updat...

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