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MC13109A Datasheet(PDF) 17 Page - Motorola, Inc |
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MC13109A Datasheet(HTML) 17 Page - Motorola, Inc |
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17 / 28 page  MC13109A 17 MOTOROLA RF/IF DEVICE DATA 1. (00000001) Latch Address U.K. Handset Select 2. (00000010) 3. (00000011) 4. (00000100) 5. (00000101) 7. (00000111) 14–Bit Tx Counter MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB 14–Bit Rx Counter 12–Bit Reference Counter 5–Bit CD Threshold Control 4–Bit Test Mode 3–Bit 1st LO Capacitor Selection 14–Bit Volume Control U.K. Base Select ALC Disable Not Used Limiter Disable Clk Disable MPU Clk1 MPU Clk0 Stdby Mode Rx Mode Tx Mute Rx Mute SP Mute Tx Counter Latch Rx Counter Latch Reference Counter Latch Mode Control Latch Threshold Control Latch 7–Bit Auxillary Latch 6. (00000110) Figure 11. Microprocessor Interface Data Latch Registers Reference Frequency Selection The “LO2 In” and “LO2 Out” pins form a reference oscillator when connected to an external parallel–resonant crystal. The reference oscillator is also the second local oscillator for the RF Receiver. Figure 12 shows the relationship between different crystal frequencies and reference frequencies for cordless phone applications in various countries. Figure 12. Reference Frequency and Reference Divider Values Reference U.K. Base/ Crystal Divider Handset Reference Frequency Value Divider Frequency 10.24 MHz 2048 1 5.0 kHz 10.24 MHz 1024 4 2.5 kHz 11.15 MHz 2230 1 5.0 kHz 12.00 MHz 2400 1 5.0 kHz 11.15 MHz 1784 1 6.25 kHz 11.15 MHz 446 4 6.25 kHz 11.15 MHz 446 25 1.0 kHz Reference Counter Figure 13 shows how the reference frequencies for the Rx and Tx loops are generated. All countries except U.K. require that the Tx and Rx reference frequencies be identical. In this case, set “U.K. Base Select” and “U.K. Handset Select” bits to “0”. Then the fixed divider is set to “1” and the Tx and Rx reference frequencies will be equal to the crystal oscillator frequency divided by the programmable reference counter value. The U.K. is a special case which requires a different reference frequency value of Tx and Rx. For U.K. base operation, set “U.K. Base Select” to “1”. For U.K. handset operation, set “U.K. Handset Select” to “1”. The Netherlands is also a special case since a 2.5 kHz reference frequency is used for both the Tx and Rx reference and the total divider value required is 4096 which is larger than the maximum divide value available from the 12–Bit reference divider (4095). In this case, set “U.K. Base Select” to “1” and set “U.K. Handset Select” to “1”. This will give a fixed divide by 4 for both the Tx and Rx reference. Then set the reference divider to 1024 to get a total divider of 4096. Mode Control Register Power saving modes, mutes, disables, volume control, and microprocessor clock output frequency are all set by the Control Register. Operation of the Control Register is explained in Figures 14 through 21. |
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Similar Description - MC13109A |
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