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參數資料
型號: LA1780M
元件分類: 調諧器
英文描述: 2-BAND, AUDIO TUNER, PQFP64
封裝: QFP-64
文件頁數: 13/38頁
文件大小: 764K
代理商: LA1780M
Usage Notes
1. Notes on VCC and Ground
2. Notes on AM Coil Connection
The VCC used for the first oscillator coil connected to pin 7 must be at the same potential as pin 61.
Connect to the IFT connected with pin 45, and to the MIX coil connected with pin 54. VCC must be at the same
potential as pin 40.
3. AM/FM Switching
Pin 6 is also used as the FM front end and RF AGC VCC
4. Relationship between Pin 23 and Pin 26
FM mode
Pin 26 functions as both the stereo indicator and the SD pin.
Pin 23: DC-input seek/stop pin (control pin)
AC output IF counter buffer pin
The Pin 23 Control Function and the Relationship between Pin 23 and Pin 26
No. 5724-20/38
LA1780M
Pin 40
VCC for the FM IF, AM, NC, MPX, and MRC blocks
Pin 25
Ground for the FM IF and AM blocks
Pin 14
Ground for the NC, MPX, and MRC blocks
Pin 61
VCC for the FM front end, AM first mixer, and first oscillator blocks
* Pin 6
VCC for the FM front end and AGC blocks, and the AM/FM switching pin
Pin 3
Ground for the FM front end, first mixer, and first oscillator blocks
Pin 6 voltage
Mode
8FM
OPEN
AM
Between 0 and a few
thousand Ohms.
IF counter buffer
SW1
SW2
Pin 23 voltage
Pin 26
OPEN
5 V
IF counter buffer on
SD
ON
OPEN
2.5 V
OFF
High-speed SD
ON
Under 0.7 V
OFF
Stereo indicator
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