參數(shù)資料
型號(hào)： LC72144M
廠商： Sanyo Electric Co.,Ltd.
英文描述： PLL Frequency Synthesizer(鎖相環(huán)頻率合成器)
中文描述： 鎖相環(huán)頻率合成器（鎖相環(huán)頻率合成器）
文件頁(yè)數(shù)： 21/22頁(yè)
文件大小： 308K
代理商： LC72144M
2. Notes on the FMIN, AMIN, HCTR/I-6, and LCTR/I-7 Pins
The coupling capacitors must be placed as close to the pin as possible. A capacitance of about 100 pF is desirable. In
particular, only use capacitances of under 1000 pF with the HCTR/I-6, and LCTR/I-7 pins. Large capacitances will
increase the time required for the pin to reach the bias level and, depending on the relationship with the wait time,
may cause counting errors.
3. Notes on IF counting
→
SD must be used together with IF counting
When using the general-purpose counter for IF counting, always use the IF-IC SD (station detect) signal. The
microcontroller should first check for the presence of the SD signal, and then turn on the IF count buffer only if that
signal is present to perform an IF count. Techniques that use only an IF count to implement an autosearch function
are dangerous because they may stop at frequencies that do not have a station due to leakage from the IF count
buffer.
4. Using the DO pin
In modes other than data output mode, the DO pin is also used for counter completion, unlock detection, and for
checking for changes in the input pin.
The state of the input pin (I/O-1, I/O-2) can be input to the controller directly through the DO pin.
5
Notes on using XBUF
When the XBUF output is turned on (when AM up-conversion is used), since the XBUF signal leaks into adjacent
pins, the pins PD0 and I/O-3, which are adjacent to XBUF, must not be used for AM reception control. Use the PD1
pin for the AM reception charge pump. Turn off the XBUF output (by setting the XB data to 0) when using PD0 and
I/O-3 for FM reception control.
6
Power supply pins
To exclude noise, a capacitor of at least 2000 pF must be inserted between the power supply V
DD
and V
SS
lines.
Locate this capacitor as close to the chip's V
DD
and V
SS
pins as possible.
Pin States at Power On and Reset
F: Floating
L: Low
No. 5377-21/22
LC72144M
State
Power On
Reset
State
Power On
Reset
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