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参数资料
| 型号： | LA1784M |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封装： | QIP-64 |
| 文件页数： | 9/50页 |
| 文件大小： | 568K |
| 代理商： | LA1784M |
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No. 6039-17/50
LA1784M
Pin No.
Function
Description
Equivalent circuit
53
56
IF OUT
IF IN
2.75 V
300
VCC
300
A11746
54
49
OSC
Pin 40 VCC
330
A11747
55
58
+
–
W-AGC
N-AGC
Pin 62
VCC
30 pF
50 pF
50
A
Signal meter
AM SD
C1
C2
MIX
IN
MIX
OUT
A11748
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Input and output pin or the first
IF amplifier
Inverting amplifier
53
IF amplifier output
V56 = 2 V
56
IF amplifier input
Input impedance: RIN = 330
V53 = 5.3 V
Output impedance
ROUT = 330
The mixer coil connected to the
54
Mixer output: 130 A
pin 54 mixer output must be
49
Mixer input
wired to VCC (pin 40).
The pin 49 mixer input
impedance is 330
Pins 55 and 58 include built-in
DC cut capacitors.
The AGC on level is determined
by the values of the capacitors
C1 and C2.
55
W-AGC IN
Pin 55 functions as the SD
AM SD ADJ
sensitivity adjustment pin in
AM mode.
58
N-AGC IN
Muting attenuation
The output current I55 is 50 A,
adjustment pin
and V55 varies depending on the
value of the external resistor.
The SD function operates by
comparing V55 with the S-meter
voltage.
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