參數資料
型號: LA1776M
廠商: SANYO SEMICONDUCTOR CO LTD
元件分類: 調諧器
英文描述: 2-BAND, AUDIO TUNER, PQFP64
封裝: 14 X 14 MM, QFP-64
文件頁數: 19/41頁
文件大?。?/td> 547K
代理商: LA1776M
No.8085-26/41
LA1776M
4. FM IF
4-1. Notes on FM SD and SD Adjustment
The FM station detection and IF counter buffer operate with the following elements.
The following conditions must be met for the station detection and IF counter buffer to operate.
(1) V24 > V41 - The S-meter voltage must be higher than the pin 41 voltage
(2) V33 < 0.7 V (Vbe) - The band muting function must not be operating.
(3) V23 = high - A high level (VDD) must be applied to pin 23 from a 51 k
resistor.
The figure below shows the relationships between the FM station detection, the IF counter buffer output, the S-
meter voltage, and the muting operation output.
FM S-meter
SD
4 V
2.7 V
FM SD adj
mute on
Soft mute
mute AMP
mute ATT
IF conut
FM IF
ST IND
SD/ST
2
1
2
12
13
1
3
mute d
SEEK = OF
SEEK = OFF
AFC
1
2
AFC
2.7 + 0.6 V
-0.6 V
20 k
30 k
200 k
30 k
23
2.5 V
5 V
58
33
44
38
37
39
41
VCC
+
_
+
_
+
_
+
_
+
_
V23DC
V23AC
V26
V33
V38
V24
5 V
Larger
values
of R33
Smaller values of R33
S-meter
V33
over 0.7 V
V33
over 0.7 V
SD as an
SD signal
SD
ON
SD
ON
Stereo
Mono
OFF
IF
count
buffer
5 V
2.5 V
0 V
IF counter output off
RDS and other types of SD detection can be used by switching these modes.
相關PDF資料
PDF描述
LA1780M 2-BAND, AUDIO TUNER, PQFP64
LA1781M AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
LA1784M AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
LA1787NM AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
LA1787NM AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
相關代理商/技術參數
參數描述
LA1776M_09 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Single-Chip Tuner IC for Car Radios
LA1776M-MPB-E 功能描述:調諧器 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數: 工作電源電壓: 最小工作溫度: 最大工作溫度:
LA177B/HG-2 制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY
LA177B-1-SRG 制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY
LA177B-HG-2 制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY