LA1225MC-AH [ONSEMI]

FM IF 检测器;


型号：	LA1225MC-AH
厂家：	ONSEMI
描述：	FM IF 检测器
文件：	总8页 (文件大小：483K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Ordering number : ENA2052

LA1225MC

Monolithic Linear IC

http://onsemi.com

FM IF Detector IC

Overview

The LA1225MC is a Low-voltage operation (1.8V or higher) 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

Maximum supply voltage

Allowable power dissipation

Operating temperature

Storage temperature

Symbol

Conditions

Ratings

Unit

max

9.0

100

Pd max

Ta ≤ 85°C

°C

Topr

Tstg

-20 to +85

-55 to +150

°C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating

Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.

Operating Conditions at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

Operating supply voltage range

3.0

1.8 to 8.0

Semiconductor Components Industries, LLC, 2013

May, 2013

41812 SY 20120411-S00004 No.A2052-1/8

LA1225MC

Operating Characteristics at Ta = 25°C, V

= 3.0V, f = 10.7MHz

Ratings

typ

Parameter

Symbol

Conditions

Unit

min

3.0

max

5.0

Current drain

No input

4.0

CCO

Demodulator output

Total harmonic distortion

Signal-to-noise ratio

3dB sensitivity

100dBμV, 100% mod., fm = 1kHz

150

0.5

220

0.8

THD

S/N

-3dBL.S

100dBμV, 100% mod.,

dBμV

fm = 1kHz output reference, when the input is -3dB

SD sensitivity

0% mod.

dBμV

IF counter buffer output

100dBμV

130

170

IFBuff

Package Dimensions

Unit : mm

3426

5.0

0.35

1.0

0.15

SANYO : SOIC10

No.A2052-2/8

LA1225MC

Block Diagram and Test Circuit

STRQ IF Buff

DET OUT

IF Buff

DET

IF Amp

S-METER

Reg

GND

FM IF IN

Sample Application Circuit

3.3k

DET OUT

STRQ

DETcoil;

YT-30103

10k

3.9k

IF Buff

0.015 μF

0.047μF

3.0V

1000pF

2pF

LA1225MC

330

FM IF IN

= 3.0V

0.047μF

10μF

0.047μF

1μF

15k

100μF

0.047μF

No.A2052-3/8

LA1225MC

Pin Functions No-Signal Voltage at V

= 3.0V

No-signal

Pin No.

Function

IF input

Equivalent circuit

Notes

voltage (V)

1.2

Input impedance

= 330Ω

Reg

1.2

Vreg = 1.2V

GND

S-meter output

0.1

Open collector output.

The SD sensitivity can be adjusted with an

external resistor connected to this pin.

3.0

1.5

Demodulated output

Output impedance

= 3kΩ

OUT

DET

3.0

The detector coil is inserted between pin 7

and pin 5 (V ).

Continued on next page.

No.A2052-4/8

LA1225MC

Continued from preceding page.

No-signal

voltage (V)

Notes

Pin No.

Function

Equivalent circuit

Limiter amplifier output

2.8

Pin 8 and pin 7 (DET) are connected through

a capacitor.

IF buffer

The IF buffer output is turned on when the

voltage applied to the pin is the

(Also used for control SW)

recommended 1.5V or higher.

1.6

This is an active-low output.

This is an open-collector output and can

directly drive an LED. (I max = 20mA)

No.A2052-5/8

LA1225MC

No.A2052-6/8

LA1225MC

PS No.A2052-7/8

LA1225MC

ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number

of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at

www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no

warranty, representation or guarantee regarding the suitabilityof its products for any particular purpose, nor does SCILLC assume any liability arising out of the

application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental

damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual

performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical

experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use

as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in

which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for

any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors

harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or

death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the

part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.

PS No.A2052-8/8

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