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PDF LA1845NV Data sheet ( Hoja de datos )
| Número de pieza | LA1845NV | |
| Descripción | Single-Chip Home Stereo IC | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : ENN*7931
www.DataSheet4U.com
LA1845NV Monolithic Linear IC
Single-Chip Home Stereo IC
The LA1845NV is designed for use in mini systems and is a single-chip tuner IC that provides electronic tuning
functions using SD/IF-count technique. 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 (114kHz, 190kHz)
• Supports both SD and IF-count techniques
• Both FM SD sensitivity and bandwidth can be set
• Pilot canceler built in.
Maximum Ratings at Ta = 25°C
Parameter
Maximum Power Supply Voltage
Allowable Power Consumption
Symbol
VCC max
Pd max
Operating Temperature
Storage Temperature
Topr
Tstg
Conditions
Ta = 80°C with board
114.3mm×76.1mm×1.6mm material :
Glass epoxy resin
Ratings
6
360
-20 to +80
-40 to +125
Unit
V
mW
°C
°C
Operating Conditions at Ta = 25°C
Parameter
Recommended Supply Voltage
Operating Supply Voltage Range
Symbol
VCC
VCC op
Ta = 80°C
Conditions
Ratings
5
4.3 to 5.5
Unit
V
V
91004 JO IM No.7931-1/10
1 page  
Continued from preceding page.
Pin No.
Pin function
Pin voltage
19 AM detector output
0V (FM)
1.5V (AM)
20 S meter,
AM AGC
0.2V (FM)
0.9V (AM)
21 AM RF input
Vreg
22 AFC
Vreg
LA1845NV
Equivalent circuit
www.DataSheet4U.com
Notes
Output impedance ro = 3.3kΩ
19
20
R
21
The resistance of the built-in resistor R is 13.9kΩ.
The SD response during seek operation is
determined with the external capacitor connected to
this pin.
Must be used at the same potential as pin 22.
The FM SD bandwidth can be adjusted with the
external resistor connected between this pin and
pin 3 (Vreg).
22
23 OSC
VCC
23
Connect the oscillator coil between this pin and pin
9 (VCC).
Note : Impedance of the secondary oscillator coil
must be 5kΩ or higher.
24 Oscillator buffer
output,
FM SD sensitivity
adjustment
VCC-1.4
R
24
The FM SD sensitivity can be adjusted with an
external resistor connected to this pin.
Output impedance R = 200Ω
Note : Resistance of the external resistor
connected to the pin 24 must be 3.3kΩ or higher.
No.7931-5/10
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