參數(shù)資料
型號(hào)： LA1135M
元件分類： 接收器
英文描述： AM, AUDIO SINGLE CHIP RECEIVER, PDSO20
封裝： MFP-20
文件頁(yè)數(shù)： 19/20頁(yè)
文件大?。?/td> 294K
代理商： LA1135M
LA1135, 1135M
No.1272-8/20
7. Meaning of L2
If the RF stage is double-tunned, the difference in sensitivity within the RF band almost disappears, but an
antireasonance point of approximately 20MHz appears, thereby leading to worse spurious characteristics. So, L2 is
used to remove the SW band.
8. Wide-band AGC
This IC contains 2-channel wide-band AGC. Pin 6 detects an undesired signal within the RF band and wide-band
AGC is applied. This detection sensitivity is determined inside the IC. Pin 2 detects an undesired signal outside the RF
band. This detection sensitivity is determined by R3. When 1mVrms (f = 1MHz) signal is applied to pin 2, AGC
operates.
9. Measures against suppression of sensitivity
In the AGC circuit of the test circuit the presence of an undesired signal of high strength within the receiving band may
cause the desired signal to be suppressed when the desired signal is low or medium in strength. Shown below is the
circuit configuration where the necessary measures are taken against this suppression.
10. Transient response of S meter output at search, stop mode
The circuit configuration shown below is available to stabilize the transient response of the S meter output at the
search, stop mode.
11. When using LW (approximately 50°C or greater), additionally connect a resistor of 27k
Ω across pins 18 and 19
against increase in local oscillation level. When using MW, no additional resistor is required.
12. Improvement in image frequency interference
Change the RF double-tuning coil as follows, and the image frequency interference becomes 63dB at fr = 1400kHz.
(Q of the tuning circuit must not be decreased with resistor 100k
Ω.)
Continued on next page.
Vref
RF AGC
VCC
+
R9
R
B
R
A
C9
2SC536
2
6
1
3
4
16
Wide-band
AGC
circuit
S meter output
Circuit added
Wide-band
ANT
damping pin
AGC input
Sample constants
RA = 4.3kΩ
RB = 3.0kΩ
(VSM-130 = 5.0V)
ANT
damping
driver circuit
RF AGC
+
C18
C19
R10
1k
Ω
R1
1
2SC536
10k
Ω
13
17
Signal during searching from PLL
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