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參數資料
| 型號： | LA1776M |
| 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： | 20/41頁 |
| 文件大小： | 547K |
| 代理商： | LA1776M |
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No.8085-27/41
LA1776M
4-2. Transient Response Characteristics During Automatic Selection
The transient response characteristics when the SD or IF counter buffer are turned on or off are determined by
the time constant at the pins shown below.
(1) AFC time constant – Pin 37
(2) Muting time constant – Pin 33
(3) S-meter time constant – Pin 24
(1) Station detection time constant due to the pin 37 AFC voltage
time constant
Since there is a function for switching the AFC time constant, it
is possible to set the time constants so that there are no harmful
effects. For reception mode, if the pin 38 capacitor value is not
made comparatively large, the total harmonic distortion may be
made worse.
Reception mode time constant: Make the time constant longer
with R34_37, C37, and C38.
Seek mode time constant: A high-speed response can be
achieved with R34_37 and C37, since the seek mode time
constant is independent of C38.
The following values are recommended.
C37: About 0.022 F
C38: About 1 F
(2) Station detection time constant due to the pin 33 muting voltage time constant
The volume changes due to fluctuations in the field during weak field reception can be made smoother by
setting the soft muting operation attack and release times appropriately.
(3) Station detection time constant due to S-meter time constant
Since the pin 24 current (I24) changes with the field strength, the time constant also changes. There is no
hysteresis in the comparator circuit. Note that if a smaller value is used for C24, the MRF frequency
characteristics setting will need to be changed as well.
C37
C38
AFC
FM STOP: ON
FM SEEK: OFF
C34
Vref
R34-37
1 k
37
34
38
VCC
+
–
+
MUTE
AMP
MUTE
DRIVE
10 k
50 k
C33
33
Attack
Release
24
10 k
FM S-meter
AM S-meter
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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 |
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