SANYO LA1225M Datasheet

Ordering number : ENN6017

32400TN (OT) No. 6017-1/8

Functions

• IF amplifier

• Quadrature detector

• Signal meter

•SD

• IF buffer

Features

• Low-voltage operation (1.8 V 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: MFP-10S

Package Dimensions

unit: mm

3086A-MFP10S

1

10

5

6

0.55

1.8max

1.00.35

5.1

0.15

6.4

1.5

0.1

4.4

5.15 0.625

SANYO: MFP10S

[LA1225M]

LA1225M

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

FM IF Detector IC

Monolithic Linear IC

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.

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

CC

max 9.0 V
Allowable power dissipation Pd max Ta ≤ 80°C 100 mW
Operating temperature Topr –20 to +80 °C
Storage temperature Tstg –55 to +150 °C

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

CC

3.0 V

Operating supply voltage range V

CC

op 1.8 to 8.0 V

Operating Conditions at Ta = 25°C

No. 6017-2/8

LA1225M

Parameter Symbol Conditions

Ratings

Unit

min typ max

Current drain I

CCO

No input 3.0 4.0 5.0 mA

Demodulator output V

O

100 dBµ, 100% mod., fm = 1 kHz 70 150 220 mV
Total harmonic distortion THD 100 dBµ, 100% mod., fm = 1 kHz 0.5 0.8 %
Signal-to-noise ratio S/N 100 dBµ, 100% mod., fm = 1 kHz 65 73 dB

3 dB sensitivity –3 dBL.S

100 dBµ, 100% mod.,

19 28 37 dBµ

fm = 1 kHz output reference, when the input is –3 dB
SD sensitivity SD

ON

0% mod. 35 50 65 dBµ
IF counter buffer output V

IFBuff

100 dBµ 90 130 170 mV

Operating Characteristics at Ta = 25°C, VCC= 3.0 V, fc = 10.7 MHz

Pin Functions and No-Signal Voltage at VCC= 3.0 V

Pin No. Function Notes No-signal voltage (V) Equivalent circuit

Input impedance
R

IN

= 330 Ω

1.21 IF input

1

2

R

IN

A11506

Vreg = 1.2 V 1.22 Reg

2

A11507

03 GND

Open collector output
The SD sensitivity can be adjusted

with an external resistor
connected to this pin.

0.14 S-meter output

4

A11508

3.05

V

CC

Output impedance
R

OUT

= 3 kΩ

1.56 Demodulated output

6

R

OUT

A11509

Continued on next page.

No. 6017-3/8

LA1225M

Continued from preceding page.

Pin No. Function Notes No-signal voltage (V) Equivalent circuit

The detector coil is inserted
between pin 7 and pin 5 (V

CC

).

3.07 DET

7

A11510

Pin 8 and pin 7 (DET) are
connected through a capacitor.

2.88 Limiter amplifier output

8

A11511

The IF buffer output is turned on
when the voltage applied to the
pin is the recommended 1.5 V or
higher.

09

IF buffer

(Also used for control SW)

9

A11512

Control SW

IF buffer output

This is an active-low output.
This is an open-collector output

and can directly drive an LED.
(I

C

max = 20 mA)

1.610 SD

10

A11513