41812 SY 20120411-S00004 No.A2052-1/8
http://onsemi.com
Semiconductor Components Industries, LLC, 2013
May , 2013
LA1225MC
Overview
The LA1225MC is a Low-voltage operation (1 .8 V or hi gher) FM IF detector IC for the electronic tuning system.
Features
• Low-voltage operation (1.8V or higher)
• Supports electronic tuning systems (provides built-in SD output and IF count output functions)
• FM detector circuit accepts an even wider input frequency range. (Supports the use of an external phase capacitor.)
• Miniature package: SOIC10
Functions
• IF amplifier
• Quadrature detector
• Signal meter
• SD
• IF buffer
Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max 9.0 V
Allowable power dissipation Pd max Ta ≤ 85°C 100 mW
Operating temperature Topr -20 to +85 °C
Storage temperature Tstg -55 to +150 °C
Operating Conditions at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage VCC 3.0 V
Operating supply voltage range VCC op 1.8 to 8.0 V
Ordering number : ENA2052
Monolithic Linear IC
FM IF Detector IC
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Cond itions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
LA1225MC
No.A2052-2/8
Operating Characteristics at Ta = 25°C, VCC = 3.0V, fC = 10.7MHz
Parameter Symbol Conditions Ratings Unit
min typ max
Current drain ICCO No input 3.0 4.0 5.0 mA
Demodulator output VO 100dBμV, 100% mod., fm = 1kHz 70 150 220 mV
Total harmonic distortion THD 100dBμV, 100% mod., fm = 1kHz 0.5 0.8 %
Signal-to-noise ratio S/N 100dBμV, 100% mod., fm = 1kHz 65 73 dB
3dB sensitivity -3dBL.S 100dBμV, 100% mod.,
fm = 1kHz output reference, when the input is -3dB 19 28 37 dBμV
SD sensitivity SDON 0% mod. 35 50 65 dBμV
IF counter buffer output VIFBuff 100dBμV 90 130 170 mV
Package Dimensions
Unit : mm
3426
SANYO : SOIC10
5.0
4.4
6.4
610
51
0.835
0.15
0.37
0.35
1.0
0.175 1.5 1.75 MAX
LA1225MC
No.A2052-3/8
Block Diagram and Test Circuit
Sample Application Circuit
+
1
10
2
9
3
8
4
7
5
6
++
Reg
SD
IF Amp
IF Buff
GND
S-METER
VCC
DET
FM IF IN VSM VCC
DET OUTIF BuffSTRQ
SD
+
1
10
2
9
3
8
4
7
5
6
++
FM IF IN
VSM VCC = 3.0V
IF Buff
STRQ
SD
LA1225MC
75
330
0.047μF
10μF1μF 100μF
0.015 μF
DET OUT
0.047μF15k0.047μF
DETcoil;
YT-30103
3.9k
2pF
1000pF
10k
3.0V
3.3k
0.047μF
LA1225MC
No.A2052-4/8
Pin Functions No-Signal Voltage at VCC = 3.0V
Pin No. Function No-signal
voltage (V) Equivalent circuit Notes
1 IF input 1.2 Input impedance
RIN = 330Ω
2 Reg 1.2 Vreg = 1.2V
3 GND 0
4 S-meter output 0.1 Open collector output.
The SD sensitivity can be adjusted with an
external resistor connected to this pin.
5 VCC 3.0
6 Demodulated output 1.5 Output impedance
ROUT = 3kΩ
7 DET 3.0 The detector coil is inserted between pin 7
and pin 5 (VCC).
Continued on nex t pa ge.
LA1225MC
No.A2052-5/8
Continued from preceding page.
Pin No. Function No-signal
voltage (V) Equivalent circuit Notes
8 Limiter amplifier output 2.8 Pin 8 and pin 7 (DE T) are connected through
a capacitor.
9 IF buffer
(Also used for control SW) 0 The IF buffer output is turned on when the
voltage applied to the pin is the
recommended 1.5V or higher.
10 SD 1.6 This is an active-low output.
This is an open-collector output and can
directly drive an LED. (ICmax = 20mA)
LA1225MC
No.A2052-6/8
LA1225MC
PS No.A2052-7/8
LA1225MC
PS No.A2052-8/8
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