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參數資料
| 型號： | LA1784M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | QIP-64 |
| 文件頁數： | 22/50頁 |
| 文件大小： | 568K |
| 代理商： | LA1784M |
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Transient response characteristics during automatic tuning
The transient characteristics for SD and IF count buffer on/off operation are determined by the time constants of
the RC circuits attached to the following pins.
(1) Muting time constant: pin 33
(2) S-meter time constant: pin 24
(3) AFC time constant: pin 34
There are two points that require consideration when using fast tuning.
(1) The SD time constant due to the S-meter time constant
Since the current I24 (pin 24) varies with the field strength, the time constant also changes. There is no hysteresis
in the comparator.
If C24 is made smaller and the pin 24 voltage is used for the keyed AGC pin 23, C23 must be chosen so that
AGC during keyed AGC operation does not become unstable.
(2) The SD time constant due to the pin 33 muting voltage time constant
The changes in volume due to field fluctuation during weak field reception can be made smoother by setting the
attack and release times during soft muting operation.
No. 6039-29/50
LA1784M
24
S-meter
I24
SD comparator
C24
R24
A12080
Mute
amp
Mute
drive
10k
50k
C33
A11766
33
Attack
Release
0
10
20
30
40
50
6
10
14
18
22
26
30
34
Antenna
input
such
that
pin
5
goes
high
—
dB
Resistance between the pin and ground — k
SD Sensitivity Adjustment
Fig.17
Fig. 15
Fig. 16
Muting time constants
Attack: 10 k
× C33
Release: 50 k
× C33
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