參數(shù)資料
型號(hào): LA1781M
廠商: Sanyo Electric Co.,Ltd.
英文描述: Single-Chip Tuner IC for Car Radios
中文描述: 單芯片調(diào)諧器IC的汽車收音機(jī)
文件頁(yè)數(shù): 17/50頁(yè)
文件大?。?/td> 567K
代理商: LA1781M
No. 6038-17/50
LA1781M
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
Pin 40 VCC
330
A11747
55
58
+
W-AGC
N-AGC
Pin 62
VCC
30 pF
50 pF
50
μ
A
Signal meter
AM SD
C1
C2
MIX
IN
MIX
OUT
A11748
Continued from preceding page.
Continued on next page.
Input and output pin or the first
IF amplifier
Inverting amplifier
53
56
IF amplifier output
IF amplifier input
V56 = 2 V
Input impedance: R
IN
= 330
V53 = 5.3 V
Output impedance
R
OUT
= 330
The mixer coil connected to the
pin 54 mixer output must be
wired to V
CC
(pin 40).
The pin 49 mixer input
impedance is 330
54
49
Mixer output: 130 μA
Mixer input
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
AM SD ADJ
Pin 55 functions as the SD
sensitivity adjustment pin in
AM mode.
58
N-AGC IN
Muting attenuation
adjustment pin
The output current I55 is 50 μA,
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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