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參數(shù)資料
| 型號(hào)： | LC72148V |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Electronic Tuning PLL Frequency Synthesizer for Car Stereo Systems |
| 中文描述： | 電子調(diào)諧鎖相環(huán)頻率合成器的汽車音響系統(tǒng) |
| 文件頁數(shù)： | 15/21頁 |
| 文件大小： | 170K |
| 代理商： | LC72148V |
Structure of the General-Purpose Counter
No. 6974-15/21
LC72148V
HCTR
1
2
LCTR
(FIF)
(T)
CTS1
CTS0
0–3
4–7
8–11
12–15
16–19
GT1, GT0
GT
S1
L
S
B
M
S
B
S2
S3
CTE
DO pin
One period/two period
extraction circuit
4/8/32/64 msec
Check signal: 900 kHz
Input signal
switching gate
General-purpose counter
(20-bit binary counter)
C = FIF
×
GT
C = (1/T)
÷
900 kHz
CTS1
CTS0
Input pin
Measurement mode
Frequency range
Input sensitivity
S1
1
*
HCTR
Frequency
0.4 to 25.0 MHz
40 mVrms
*
1
S2
0
1
LCTR
Frequency
10 to 500 kHz
1.0 to 20
×
10
3
Hz
40 mVrms
*
1
S3
0
0
LCTR
Period
(pulse)
*
1 CTC = 0 : 40 mVrms
CTC = 1 : 70 mVrms
—: No rating (not guaranteed)
( ): Actual performance (provided for reference purposes)
CTC is the input sensitivity switching data; when CTC is 1, the input sensitivity is degraded.
However, the actual performance will be:
HCTR
→
20 to 40 mV rms (frequency: 10.7 MHz)
LCTR
→
20 to 30 mV rms (frequency: 450 kHz)
CTP: Pulling down the input is disabled (when CTE is 0) by setting CTP to 1.
CTP must be set to 1 at least 4 ms before CTE is set to 1. If the counter is not used, CTP must be left set to 0. The wait
time is reduced 1 to 2 ms when CTP is set to 1.
HCTR: Minimum input sensitivity rating f [MHz]
0.4
≤
f < 8
CTC
8
≤
f < 12
40 mVrms
(0.1 to 5 mVrms)
12
≤
f
≤
25
0 (Normal mode)
40 mVrms
40 mVrms
1 (Degraded mode)
—
70 mVrms
(20 to 40 mVrms)
—
LCTR: Minimum input sensitivity rating f [kHz]
10
≤
f < 400
CTC
400
≤
f
≤
500
20 mVrms
(0.1 to 4 mVrms)
0 (Normal mode)
40 mVrms
1 (Degraded mode)
—
70 mVrms
(20 to 30 mVrms)
GT1
GT0
Frequency measurement mode
Period measurement
Measurement time
Wait time
mode
0
0
4 ms
3 to 4 ms
1 period
0
1
8
1
0
32
7 to 8 ms
2 periods
1
1
64
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