參數(shù)資料
型號(hào)： LA1136N
廠商： Sanyo Electric Co.,Ltd.
英文描述： AM Tuners for Car Radios and Home Stereos(應(yīng)用于車(chē)載電臺(tái)和家庭立體聲的AM調(diào)諧器)
中文描述： 上午車(chē)用收音機(jī)調(diào)諧器和家庭影院（應(yīng)用于車(chē)載電臺(tái)和家庭立體聲的上午調(diào)諧器）
文件頁(yè)數(shù)： 19/28頁(yè)
文件大?。?/td> 573K
代理商： LA1136N
(2) SD sensitivity adjustment method
The SD sensitivity is determined by the voltage level of the two inputs to the comparator. Because the absolute value is
determined by the resistor as described above, no matter which level, the sensitivity can be adjusted through both levels.
However, from the standpoint of the stability of the system as a whole and given the possibility that the S-meter output will
be used for other purposes, it is best to make adjustments by adjusting the value on pin 9.
Because the S-meter I/O characteristics during a seek operation or a receive operation are basically as depicted in the diagram
below, so allowing for potential differences, the setting level for the adjustable range should be 25 to 60 dBμ.
(3) Support for the LM7000 (IF count method)
Implemented as shown in the figure at right.
15. Tweet Prevention Circuit
(1) Cause and countermeasures for Tweet distortion
The beat noise frequency characteristics for LA1137N is fr = 900 kHz and the corresponding circuit where it is generated are
shown below. The minimum signal-to-noise ratio for tuners using a reference input signal is 30 dB.
Mechanism behind the deterioration of the characteristics
The 900 kHz RF input signal from the antenna is amplified by the FET RF amplifier before passing through the RF
alignment stage to the mixer. If this signal is large, the varactor diodes can cause second-harmonic distortion of 1.8 MHz.
The 900 kHz and 1.8 MHz components each generate an IF signal; (450 +
α
) kHz for the 900 kHz signal, and (450 –
α
) kHz
for the 1.8 kHz signal. These two signals interact to produce a beat frequency at 2
× α
kHz.
Receive mode
Station seek mode
Antenna input level – dBμ
IF count control voltage (STRQ)
IF buffer signal
O
Antenna input – dBμ
Complete alignment (Maximum
beat noise at 900 kHz)
Complete alignment
(zero beat noise)
Tweet input
Signal Characteristics
LA1136N, 1136NM, 1137N, 1137NM
No. 3507-19/28
相關(guān)PDF資料
PDF描述
LA1140 FM IF System for Car Radio
LA1143 FM IF System for Car Radios
LA1145 FM IF System (Quadrature Detector) for Car Radio
LA1145M FM IF System (Quadrature Detector) for Car Radio
LA1150N FM IF Amplifier for Car Radio
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LA1136NM 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos
LA1137 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos
LA1137M 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
LA1137N 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos
LA1137NM 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM Tuners for Car Radios and Home Stereos
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