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)： 5/50頁(yè)
文件大?。?/td> 567K
代理商： LA1781M
Operating Characteristics and Symbols Used in the Test Circuit Diagrams
Switches (SW)
Switch on = 1, SW off = 0
There are two switches that use signal transfer.
— SW2: switches between the mixer input and the IF input.
— SW4: switches between noise canceler input and IF output + noise canceler input.
No. 6038-5/50
LA1781M
Types of SG used
PG1 (AC1)
Used for noise canceler testing. A pulse generator and an AF oscillator are required.
AC2
Used for FM front end testing. Outputs an 83 MHz signal.
AC3
Used for FM IF, noise canceler, and MPX testing. Outputs a 10.7 MHz signal. Stereo modulation must be possible.
AC4
Used for AM testing. Outputs 1 MHz and 1.4 MHz signals.
AC5
Used with the MRC. Can also be used for AF and OSC.
Power supply
V
CC
V
CC
1
V
CC
2
V
CC
3
8 V
5 V
SD, stereo, seek/stop
0.1 V / 0.7 V / 2 V / 4 V
These levels
must be variable.
Keyed AGC, Mute ATT
0.1 V / 0.6 V / 2 V
HCC, SNC, SASC (MRC)
Trimmers (variable resistors)
VR1
Separation adjustment
VR2
Pilot cancellation adjustment
AC voltages
VA1
AM/FM OSC Buff
Pin 4
Pin 53
→
CF
→
pin 51 load level (10.7 MHz)
Pin 23 (10.7 MHz/450 kHz)
VA2
First IF output
VA3
IF counter buffer
VA4
MPX OUT Left ch
Pin 15 (AF)
VA5
MPX OUT Right ch
Pin 16 (AF)
Test Points
DC voltages
VD1
FM RF AGC voltage
Pin 2
VD2
AM/FM SD, AM Tweet, FM stereo indicator
Pin 26
VD3
AM/FM S-meter
Pin 24
VD4
MRC output
Pin 27
VD5
Mute drive output
Pin 33
VD6
AM antenna damping voltage
Pin 46
VD7
N.C. Gate time
Pin 8
Switches
Parameter
ON
OFF
SW1
AM/FM switching. The FE V
CC
is supplied to pin 62.
FM IF switching. Pin 51/FE output
FM
AM
SW2
FE IF OUT (A)
AC3 (B)
SW3
For conversion gain testing
Conversion gain measurement (A)
Other/purposes
SW4
For switching between noise canceler input and IF output + noise canceler.
AC1 (A)
Other/purposes
SW5
High-speed SD
High-speed SD
Other/purposes
SW6
SEEK/STOP (IF BUFF ON/OFF)
MUTE ATT 200 k
MUTE ATT 30 k
For pilot cancellation testing
STOP
Seek (IF buffer output)
SW7
MUTE 200 k
MUTE 30 k
OFF
SW8
OFF
SW9
When pilot cancellation is used
When pilot cancellation is not used
SW10
Mute off (pin 33)
MUTE OFF
MUTE ON
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參數(shù)描述
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