參數(shù)資料
型號(hào)： MC72000
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： Integrated Bluetooth Radio
中文描述： 集成藍(lán)牙無線
文件頁(yè)數(shù)： 39/156頁(yè)
文件大?。?/td> 1782K
代理商： MC72000
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MOTOROLA
MC72000
Advance Information Data Sheet
Go to: www.freescale.com
39
LUT R
4
C
2b2
= INT((415.2+2)/4)
b10
= INT(104.3)
b10
= 104
b10
or 011010000
b2
or 68
b16
The following table lists all values of RxCx for supported reference.
6.4.4 M-Dual Port Multiplier and B-Dual Port Multiplier
For proper operation of the dual-port synthesizer, it is necessary to maintain a constant deviation injection
at the input of Port 2 of the VCO. As appears from the Transmit ROM operation and Figure 17, the output
of the LUT is fed to a digital multiplier prior to being presented to the input of the modulation DAC. Since
the LUT values decrease proportionately with input reference frequency, the multiplier must scale these
values to achieve a constant deviation. This scaling is linear. Two programmable constants are used to
form the equation of a line, the M & B dual-port multipliers. M-Dual Port Digital Multiplier Value (R17/
15-8), determines the slope, and B-Dual Port Digital Multiplier Value (R8/7-0), determines the intercept.
M-Dual Port Digital Multiplier = (f
ref
External) /13 MHz * 108
10
B-Dual Port Digital Multiplier = (f
ref
External) /13 MHz * 97
10
Table 20 contains slope and intercept point values across all supported input reference frequencies.
6.4.5 Dual-Port Programmable Delay (R7/15-11)
It is necessary to maintain a constant deviation at Port2 of the VCO. Likewise, it is necessary to maintain a
constant phase at the FV and FR inputs of the main charge pump. The total delay from the output of the
LUT to the FV input of the charge pump is given as follows:
LUT
→
FV delay = 10.5 / (f
ref
External)
Likewise, the total delay from the LUT to the FR input of the charge pump is as follows:
LUT
→
FR delay = 28 ns + Delay
where delay is the programmed delay value shown in Table 19. Therefore, for a given external reference
frequency:
Delay = 10.5 / (f
ref
External) - 28 ns.
Table 18. RxCx Constants
R1C1
0.9999739537
R2C2
0.9980246857
R2C3
0.9911665663
R2C4
0.9678427310
R3C1
0.1881990082
R3C2
0.5249014674
R3C3
0.7660791186
R3C4
0.9043672052
R4C2
0.5229292198
R4C3
0.7572459756
R4C4
0.8722099597
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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