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PDF LA1845N Data sheet ( Hoja de datos )
| Número de pieza | LA1845N | |
| Descripción | Single-Chip Home Stereo IC | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : ENN7185
Monolithic linear IC
LA1845N, 1845NM
Single-Chip Home Stereo IC
Overview
The LA1845N/1845NM is designed for use in mini
systems and is a single-chip tuner IC that provides
electronic tuning functions using SD/IF-count technigue.
It incorporates a pilot canceler and an adjustment-free
MUX VCO circuit, thus allows additional parts to be
reduced.
Functions
• AM: RF amplifier, mixer, oscillator, IF amplifier,
detector, AGC, SD, oscillator buffer, IF buffer,
stereo IF output, AGC time constant switch
• FM IF: IF amplifier, quadrature detector, S-meter, SD
(signal detection), S-curve detection, IF buffer
output
• MPX: PLL stereo decoder, stereo display, forced
monaural, VCO stop, audio muting, adjacent
channel interference rejection function, pilot
canceler
Features
• Integrated MPX VCO (ceramic resonators are no longer
required.)
• Built-in adjacent channel interference rejection function
(114 kHz, 190 kHz)
• Supports both SD and IF-count techniques
• Both FM SD sensitivity and bandwidth can be set
• Pilot canceler built in.
Package Dimensions
unit: mm
3067A-DIP24S
[LA1845N]
21.0
24 13
1
0.9
12
(0.71) 1.78 0.48
0.95
unit: mm
3112A-MFP24S
24
[LA1845NM]
13
1 12.5 12
SANYO: DIP24S
0.15
0.35 1.0 (0.75)
SANYO: MFP24S
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
91002RM (OT) No. 5888-1/10
1 page  
Continued from preceding page.
Pin No.
Pin function
Pin voltage
Pilot detector low-
12 pass filter (Forced VCC – 1.0
mono) (VCO stop)
LA1845N, 1845NM
Notes
The device is forced to monaural when a current of
over 50 µA flows from this pin.
The VCO is stopped when a current of over 200 µA
flows from this pin.
The limit values for the resistor are the same as
those for pin 11.
Equivalent circuit
12
A10642
13 L outputs
14 R outputs
3.2 V
3.2 V
Output impedance ro = 3.3 kΩ
15
Pilot canceler
output
Vreg
16 Decoder input
Vreg
Inverting input pin
RNF = 20 kΩ
13
( 14 )
A10647
15
3
A10645
RNF
16
17 PLL input
Vreg
Input impedance ri = 20 kΩ
Output impedance ro = 2.3 kΩ
18
FM demodulator
output
Vreg + 0.7 (FM)
Vreg + 0.7 (AM)
The channel separation can be adjusted with an
external capacitor connected between this pin and
ground.
19
AM detector
output
0 V (FM)
1.5 V (AM)
Output impedance ro = 10 kΩ
S meter,
20
AM AGC
0.2 V (FM)
0.9 V (AM)
The resistance of the built-in resistor R is 13.9 kΩ
The SD responce during seek operation is
determined with the external capacitor connected
to this pin.
17
18
100V
19
A10649
20
R
A10651
Continued on next page.
No. 5888-5/10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LA1845N.PDF ] | |
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