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參數(shù)資料
| 型號(hào)： | M491B1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SINGLE-CHIP VOLTAGE SYNTHESIS TUNING SYSTEM WITH 1 ANALOG CONTROL |
| 中文描述： | 單片電壓合成調(diào)諧系統(tǒng)的1個(gè)模擬控制 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 135K |
| 代理商： | M491B1 |
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34
35
36
37
38MHz
38.8
39
40MHz
NORMALAFC POSITION
t
TRANSMITTER
IDENTIFICATION
Pin6
Pin2
SEARCH
DIRECTION
SIGNALS
ON
TDA4433
SEARCH
START
FAST UP
S1
MEDIUM UP
S2= 0.5S1
MEDIUMDOWN
S3 = 0.25S1
SLOW UP
S3 = 67Hz
38.8
VARICAP VOLTAGE
139.0MHz
38.8MHz
AFC
THESHOLD
DIGITAL
INFORMATION
STOP
t
IF
RESPONSE
NORMAL AFC
OPERATION
38.8
MHz
40
39
4
Figure10
PIN 14 : SWEEPSEARCH DISPLAYOUTPUT
This output, which is normally Low, goes High
during automaticsearch automaticpreset et inter-
vals of 160ms for about 40ms to blank theLED of
band display.
V
SS
BAND
LEDS
4
Figure11
PIN 15 : VOLUME D/AOUTPUT
This output delivers a square wave signal of 7.8
kHz and duty cycle variable in 63 steps.In case of
a continuouscommand forvaryingthe volume,the
duty cycle is changed at the rate of the transmitted
signal (approximately every 102ms with f
ref
=
500kHz)or every 112ms if issued locally.
Overflow and underflowprotection are provided.
The volume output can be switched to V
SS
and
reset to the previous level by means of the Mute
On/Off command. It is also reset by the Volume
Up/Down and the Mains On/Off commands.
The volume is muted for about 1s at each mains
onandoffcommandduringthepoweronresettime
and programchange (0.5s).
At the first power on reset of V
DD
the volumeD/A
is setat the level 21/64. The lastlevel is preserved
until V
DD
is not removed.
M491B
10/16
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| M49-20.000-18-30/50/4085 | 制造商:MEC 功能描述:Crystal SMD 20.000MHz HC49S-SMD |
| M49-24.000-18-30/50/4085 | 制造商:MEC Switches A/S 功能描述:Crystal SMD 24.000MHz HC49S-SMD |
| M49-24.576-18-30/50/4085 | 制造商:MEC Switches A/S 功能描述:Crystal SMD 24.576MHz HC49S |
| M49-25.000-18-30/50/4085 | 制造商:MEC 功能描述:Crystal SMD 25.000MHz HC49S-SMD |
| M49-27.000-18-30/50/4085 | 制造商:MEC Switches A/S 功能描述:Crystal SMD 27.000MHz HC49S-SMD |
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