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參數(shù)資料
| 型號： | LA1137NM |
| 元件分類： | 接收器 |
| 英文描述： | AM, AUDIO SINGLE CHIP RECEIVER, PDSO20 |
| 封裝： | MFP-20 |
| 文件頁數(shù)： | 10/19頁 |
| 文件大?。?/td> | 720K |
| 代理商： | LA1137NM |
14. Stop Detector Adjustment
Although this explanation is for the LA1137N, it is identical for the LA1136N, except that the pin numbers are different.
The LA1137N is designed for use with the following microcontrollers.
Stop detection method: LM7001 (Sanyo) (SD output only)
IF count method:
LM7000 (Sanyo)
LC7230 (Sanyo)
(1) Support for the LM7001
The search stop detector uses the active HIGH signal of pin18.
The IF signal from the IF amplifier is detected, on pin 16 the signal that determined the bandwidth characteristics through the
narrowband filter BFU450CN (BFU450CN is equivalent to the amplifier emitter load) is detected, and the S-meter output is
output by the S-meter drive circuit by driving with current the load on pin 17. Therefore, the S-meter output VSM on pin 17
has the following relationship with the S-meter load R17.
VSM ∞ R17
In the above example, 3 kΩ is changed to 4.5 kΩ, but the R ratio of the output is 1.5x. However, the meter output has an upper
limit; as a guide, saturation occurs when the upper limit is at about VCC – 1.4 V. The pin 18 SD output is generated by
comparing the S-meter output described above with the reference voltage Vref on pin 9 (400 × R9). Using the
recommended constants, Vref = 400 × 2.4 k = 1.0 (V).
The comparator compares the electric potential of pin 17 with that of pin 9 and detects when the electric potential of pin 17
is greater than that of pin 9, in which event the transistor is turned off and the SD output changes from LOW to HIGH (GND
to VDD).
Note that, in consideration of differences in circuit configurations, Vref should be at least 0.7 V.
Antenna input – dB
S-meter load
Unit (capacitance: F)
Ω
LA1136N, 1136NM, 1137N, 1137NM
No. 3507-18/28
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LA1137N | AM, AUDIO SINGLE CHIP RECEIVER, PDIP20 |
| LA1136NM | AM, AUDIO SINGLE CHIP RECEIVER, PDSO24 |
| LA1136N | AM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| LA1143 | FM, AUDIO DEMODULATOR, PDIP16 |
| LA1145M | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA1140 | 制造商:Panasonic Industrial Company 功能描述:IC |
| LA1140_09 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:FM IF SYSTEM FOR CAR RADIO |
| LA1140B-E | 制造商:ON Semiconductor 功能描述:CAR RADIO FM IF SYSTEM - Ammo Pack |
| LA1140-E | 功能描述:射頻接收器 CAR RADIO FM IF SYSTEM RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| LA1143 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:FM IF System for Car Radios |
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