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參數(shù)資料
| 型號： | LA1784M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | QIP-64 |
| 文件頁數(shù)： | 45/50頁 |
| 文件大小： | 568K |
| 代理商： | LA1784M |
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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. 6039-5/50
LA1784M
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
VCC
8 V
VCC1
5 V
SD, stereo, seek/stop
VCC2
0.1 V / 0.7 V / 2 V / 4 V
These levels
Keyed AGC, Mute ATT
VCC3
0.1 V / 0.6 V / 2 V
must be variable.
HCC, SNC, SASC (MRC)
Trimmers (variable resistors)
VR1
Separation adjustment
VR2
Pilot cancellation adjustment
VA1
AM/FM OSC Buff
Pin 4
VA2
First IF output
Pin 53
→ CF → pin 51 load level (10.7 MHz)
VA3
IF counter buffer
Pin 23 (10.7 MHz/450 kHz)
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 VCC is supplied to pin 62.
FM
AM
SW2
FM IF switching. Pin 51/FE output
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
Other/purposes
SW6
SEEK/STOP (IF BUFF ON/OFF)
STOP
Seek (IF buffer output)
SW7
MUTE ATT 200 k
MUTE 200 k
OFF
SW8
MUTE ATT 30 k
MUTE 30 k
OFF
SW9
For pilot cancellation testing
When pilot cancellation is used
When pilot cancellation is not used
SW10
Mute off (pin 33)
MUTE OFF
MUTE ON
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