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MC145162P Datasheet(PDF) 11 Page - LANSDALE Semiconductor Inc. |
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MC145162P Datasheet(HTML) 11 Page - LANSDALE Semiconductor Inc. |
11 / 24 page www.lansdale.com Page 11 of 24 Issue 0 REFERENCE FREQUENCY SELECTION AND PROGRAMMING Figure 16 shows the bit function of the reference frequency programming word. The user can either select the “fixed” ref- erence frequency for all channels accordingly or provide a spe- cific reference frequency for a particular channel by using two reference frequency counters (e.g., for an application in France, the base set transmit channel common fixed reference frequency is 6.25 kHz or 12.5 kHz). (See Table 3 and Figure 6 for reference frequencies for various countries.) However, transmit channels 6, 8, and 14 can be set to 25 kHz, and chan- nel 8 reference frequency can be set to 50 kHz. But this refer- ence frequency may not be applied to the receiving side; there- fore, the receiving side reference frequency must be generated by another reference frequency counter. The higher the refer- ence frequency, the better the phase noise performance and faster the lock time, but the PLL consumes more current if both reference frequency counters are in operation. In general, the 12–bit reference frequency counter plus the ÷ 4 and ÷ 25 module can offer all the reference frequencies for global CT–1 transmit and receive channel requirements. Users can select their own reference frequency by introducing the additional 14–bit auxiliary reference frequency counter. Again, the 14–bit auxiliary reference frequency counter can be shut down by the auxiliary reference enable bit in the refer- ence counter programming word by setting the bit to 0. At this state, the fR2 is automatically connected to point C (the ÷25 block output), and fR1 can be connected to point A or B by setting the fR1–S1 and fR1–S2 bits in the reference counter program word. The 14–bit auxiliary reference frequency count- er data will be in “Don’t Care” state. If the 14–bit auxiliary reference frequency counter is enabled (auxiliary reference enable = 1), then fR2 is automatically con- nected to point D (14–bit counter output), and fR1 can be selected to connect to point A, B, or C, depending on the bit setting of fR1–S1 and fR1–S2. Table 4 and Figure 16 describe the functions of the auxiliary reference enable bit and the fR1–S1 and fR1–S2 bits selection. LANSDALE Semiconductor, Inc. ML145162 ADin CLK ENB Figure 15. Programming Format for Transmit and Receive Counters (4–Pin Interfacing Scheme) 16–BIT Tx COUNTER DIVDE RATIO Din 16–BIT Rx COUNTER DIVIDE RATIO NOTE: ENB must be low during the serial transfer. LAST CLOCK Table 3. Global CT–1 Reference Frequency Setting vs Channel Frequencies Country Channels Frequency fR1 fR2 U.S.A. 46/49 MHz (10, 15, 25 Channels) 5.0 kHz — France 26/41 MHz 6.25 kHz/12.5 kHz — Spain 31/41 MHz 5.0 kHz — Australia 30/39 MHz 5.0 kHz — U.K. 1.7/47 MHz 6.25 kHz 1.0 kHz New Zealand 1.7/34/40 MHz 6.25 kHz 1.0 kHz |
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