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| 型號： | LA1781M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | 14 X 14 MM, QIP-64 |
| 文件頁數(shù)： | 26/48頁 |
| 文件大?。?/td> | 508K |
| 代理商： | LA1781M |
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LA1781M
No.6038-32/48
Notes on the quadrature input level
When a strong field is being received the quadrature signal input (pin 36) requires a 200mVrms input, and the
detection transformer and the damping resistor between pins 36 and 37 must be designed.
(We recommend the Sumida SA-208 transformer and a 10k
Ω resistor between pins 36 and 37.)
When the pin 36 input level falls below 160mVrms, the Hall detection circuit operates and the pin 33 mute drive
output voltage increases. Therefore, when pin 36 input is from 160 to under 200mV rms during strong field reception,
the muting circuit may or may not operate due to sample-to-sample variations between individual ICs.
Furthermore, the SD function may not operate, and the audio output level may be reduced. Incorrect operation due to
sample-to-sample variations and temperature characteristics can be prevented by keeping the pin 36 voltage at
200mVrms or higher.
36
37
SG
10.7MHz
LA1888M
75
Ω
75
Ω
+
0.022
μF
Pin 33 VMute -- QD Input Level
0
2
3
4
5
1
6
92
94
96
104
102
100
98
106
QD input level -- dB
μ
Vmute
-
V
THD
-
%
With pins 34 and 37 shorted.
With 5V applied to pin 24.
With a 10k
Ω resistor
between pins 36 and 37
THD 1kHz
75kHz dev
Δf -- kHz
Δf = 0 →
10.7kHz
With the resistorbetween
pins 36 and 37 open.
Voltage between pins 37 and 34
(referenced to the pin 37 voltage)
Fig. 29
SA208 + LA1781M IF Input Characteristics Fig. 30
0.2
--0.2
--0.4
--0.6
--0.8
0.4
0.6
0.8
1
2
3
4
0
--20
--40
--60
--80
20
40
60
80
100 120
--100
--120
f1
f2
ANT
IN
Unique Featuers of the LA1781M Hall Detection circuit (1)
0
4
6
--1
0
1
2
97.7
97.8
97.9
98.0
98.1
98.2
98.3
Frequency, fr -- MHz
Voltage
between
pins
37
and
34,
V
AFC
-
V
Pin
33,
V
Mute
-
V
0
4
6
2
Pin
24,
V
SM
-
V
0
4
6
8
2
Pin
26
(SD)
-
V
When the tuner is moved in 50kHz steps.
With a 51k
Ω resistor between pins 37 and 34.
With the SD sensitivity adjusted to be 20dB
μ.
f2 = 97.9MHz, 120dBμ
fm = 400Hz, 22.5kHz dev.
f1 = 98.1MHz, 120dBμ
fm = 1kHz, 22.5kHz dev.
Fig. 27
Unique Featuers of the LA1781M Hall Detection circuit (2)
0
4
6
--1
0
1
2
97.7
97.8
97.9
98.0
98.1
98.2
98.3
Frequency, fr -- MHz
Voltage
between
pins
37
and
34,
V
AFC
-
V
Pin
33,
V
Mute
-
V
0
4
6
2
Pin
24,
V
SM
-
V
0
4
6
8
2
Pin
26
(SD)
-
V
When the tuner is moved in 50kHz steps.
With a 51k
Ω resistor between pins 37 and 34.
With the SD sensitivity adjusted to be 20dB
μ.
f2 = 97.9MHz, 40dBμ
fm = 400Hz, 22.5kHz dev.
f1 = 98.1MHz, 40dBμ
fm = 1kHz, 22.5kHz dev.
Fig. 28
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