Specifications - Samsung S-2400 Service Manual

IC Internal Diagram
10-5 LA1837 ; TIC1
Ordering number : EN5688
Overview
The LA1837 is a single-chip AM/FM IF and MPX IC that
supports electronic tuning and was developed for use in
home stereo systems. It is optimal for use in automatic
station selection systems that use the SD and IF counting
techniques.
Functions
AM: RF amplifier, mixer, oscillator, IF amplifier,
detector AGC, oscillator buffer, S-meter, narrow-
band SD, IF buffer
FM IF: IF amplifier, quadrature detector, S-meter, S-
curve detector, IF buffer output
MPX: PLL stereo decoder, stereo display, forced mono,
VCO stop, post amplifier, audio muting, adjacent
channel interference rejection function
Features
• On-chip MPX VCO (no external components required)
• Adjacent channel interference rejection function
(third and fifth order)
• Supports both the SD and the IF counting techniques.
• The AM and FM SD sensitivities can be set independently.
• The AM and FM output levels can be set independently.
• Improved AM practical sensitivity and high-input
distortion characteristics

Specifications

Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Operating voltage range
Samsung Electronics
Single-Chip Home Stereo IC with
Package Dimensions
unit: mm
3061-DIP30S
Symbol Conditions
V max
CC
Ta ≤ 70°C
Pd max
Topr
Tstg
Symbol Conditions
V
CC
V op
CC
Monolithic Linear IC
LA1837
Electronic Tuning Support
[LA1837]
SANYO: DIP30S
Ratings
550
–20 to + 70
–40 to +125
Ratings
7 to 11
Unit
12 V
mW
°C
°C
Unit
9 V
V
10-13