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参数资料
| 型号： | MC13109AFB |
| 厂商： | MOTOROLA INC |
| 元件分类： | 无绳电话/电话 |
| 英文描述： | UNIVERSAL CORDLESS TELEPHONE SUBSYSTEM IC |
| 中文描述： | TELECOM, CORDLESS, RF AND BASEBAND CIRCUIT, PQFP52 |
| 封装： | PLASTIC, QFP-52 |
| 文件页数： | 22/28页 |
| 文件大小： | 1307K |
| 代理商： | MC13109AFB |
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MC13109A
22
MOTOROLA RF/IF DEVICE DATA
Auxiliary Register
The auxiliary register contains a 3–Bit 1st LO Capacitor
Selection latch and a 4–Bit Test Mode latch. Operation of
these latch bits are explained in Figures 24, 25 and 26.
Figure 24. Auxiliary Register Latch Bits
4–Bit Test Mode
3–Bit 1st LO
Capacitor Selection
MSB
LSB
MSB
LSB
First Local Oscillator Capacitor Selection for 25
Channel U.S. Operation
There is a very large frequency difference between the
minimum and maximum channel frequencies in the proposed
25 Channel U.S. standard. The sensitivity of the 1st LO is not
large enough to accommodate this large frequency variation.
Fixed capacitors can be connected across the 1st LO tank
circuit to change the 1st LO sensitivity. Internal switches and
capacitors are provided to enable microprocessor control
over internal fixed capacitor values. Figure 25 shows the
schematic of the 1st LO tank circuit. Figure 26 shows the
latch control bit values.
Figure 25. First LO Schematic
LO1 In
40
LO1 Out
41
Vcap Ctrl
42
Internal Capacitor
1st LO
Varactor
Varactor
Cext
Lext
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Capacitor
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