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參數資料
| 型號： | LA1650C |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP18 |
| 封裝： | DIP-18 |
| 文件頁數： | 13/14頁 |
| 文件大小： | 125K |
| 代理商： | LA1650C |
Block Functional Descriptions
Amplifier Block
The radio signal picked up by the bar antenna (resonant frequency: 40 kHz for Japan) is amplified by amplifier 1 which
includes an AGC function, and is passed through a 40 kHz crystal element used as a bandpass filter. This signal is then
amplified further by amplifier 2. The total gain from the amplifier 1 input to the amplifier 2 output is 90 dB when the
AGC is disabled.
The AGC voltage is set up to be about 0.6 V when there is no input present. However, since charging is performed by a
small current of only a few A, we recommend precharging if the LA1650 is used for reception immediately after power
is applied. (Charge to about 1.0 V for about 100 ms.)
DEC Block
The time code signal (1 Hz) from which the 40 kHz carrier has been removed is input to the DEC block, and wave
shaping is applied to create a serial output signal in which 1 and 0 have the levels VCC and ground, respectively.
No. 6310-8/14
LA1650, 1650C
AMP(1) witn AGC
AMP(2)
Crystal
A12770
Since amplifier 1 has frequency characteristics of –3 dB at fc = 80 kHz from the output level at fc = 40 kHz, and
amplifier 2 has frequency characteristics that are flat up to 100 kHz, this IC can support the standard radio frequencies
used in any country simply by changing bar antenna and the resonant frequency of the crystal used.
REC Block
The 40 kHz carrier signal output from amplifier 2 is input to the REC block through a 1000 pF capacitor. The REC block
input impedance is 20 k
, which, in conjunction with the 1000 pF capacitor, forms a high-pass filter with a cutoff
frequency of about 8 kHz. The carrier is full-wave rectified within the REC block, split into two signal systems, and
output. One signal system passes through a low-pass filter with a time constant of about 1 s and is then input to the DEC
block. The other passes through a low-pass filter with an even larger time constant and is fed back to amplifier 1 as the
AGC control voltage (pin 3: a DC voltage).
Rectifier
Low-pass filter
(time constant: 1 s)
Low-pass filter
(time constant: several seconds or longer)
To the DEC block
AGC voltage (to amplifier 1)
A12771
Decoder
VCC
GND
A12772
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LA1652C | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC Time Code Reception IC |
| LA1654C | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC Time Code Reception IC |
| LA1654C-X1 | 功能描述:計時器和支持產品 RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內部定時器數量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| LA1654FN | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Time Code Reception IC |
| LA165B-R-4SRG.X-AS-PF | 制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY |
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