la1145

Manufacturer Part Numberla1145
DescriptionFm If System Quadrature Detector For Car Radio
ManufacturerSanyo Semiconductor Corporation
la1145 datasheet
 


1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
Page 1/17

Download datasheet (383Kb)Embed
Next
Ordering number: ENN 2725B
Features
1.
On-chip IF count buffer circuit and microprocessor-
controlled switch circuit for ETR.
2.
Compared to the LA1140, the LA1145, 1145M offer:
1 Improved signal meter output linearity;
2 Improved band mute temperature stability;
3 Improved S/N ratio;
4 Improved sound quality at weak signal input when
noise is present, and;
5 Improved AMR characteristics during weak signal
input.
3.
Reduced parts’ count simplifies design:
1 On-chip IF count buffer circuit;
2 On-chip SD circuit — sensitivity can be set
independently of soft mute characteristics, and;
3 Variable S-meter gradient — three pin S-meter output
(pins 5, 16 and 17) facilitates independent control of
SNC and HCC.
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
FM IF System (Quadrature Detector) for Car Radio
Package Dimensions
unit : mm
3115-SIP18Z
1
1.305
2.54
unit : mm
3036C-MFP20
20802TN(II)/93097HA(II)/3132TS/2118TA No.2725-1/17
Monolithic Linear IC
LA1145, 1145M
[LA1145]
24.2
3.25
18
0.25
0.5
2.54
2.54
SANYO : SIP18Z
1.27
[LA1145M]
20
11
10
1
0.15
12.5
(0.4)
0.35
1.27
SANYO: MFP20

la1145 Summary of contents

  • Page 1

    ... Features 1. On-chip IF count buffer circuit and microprocessor- controlled switch circuit for ETR. 2. Compared to the LA1140, the LA1145, 1145M offer: 1 Improved signal meter output linearity; 2 Improved band mute temperature stability; 3 Improved S/N ratio; 4 Improved sound quality at weak signal input when noise is present, and; ...

  • Page 2

    ... Offset voltage V SD sensitivity IF count output level V [LA1145M] Maximum Ratings °C Parameter Maximum supply voltage Maximum supply current Allowable power dissipation Operating temperature Storage temperature LA1145, 1145M Symbol Conditions V max Pin max Pin max ° 70°C ...

  • Page 3

    ... Signal strength indication output Muting drive output V AM rejection ratio AMR V Offset voltage V SD sensitivity V IF count output level max – Ta Ambient temperature, Ta – °C LA1145, 1145M Symbol Conditions 10.7 MHz CC in Conditions dBµ CCO 100 dBµ ...

  • Page 4

    ... LA1145 Equivalent Circuit Block Diagram S-meter detector IF amp IF amp LA1145M Equivalent Circuit Block Diagram LA1145, 1145M Quadrature detector IF amp S-meter Mute driver Hole IF S-meter Voltage detector/ count regulator mute detector driver Start point Gradient Voltage regulator Hole IF detector/ mute count driver ...

  • Page 5

    ... LS1140 and LS1145 Compared Parameter Package IF amp, limiter Quadrature detector AF preamp AFC output Signal meter output Band muting IF count buffer output SD circuit S/N 3 dBµ limiting sensitivity Weak signal noise output LA1145, 1145M Mute driver S-meter output output LA1140 LA1145 SIP-18Z SIP-16 MFP-20 Direct-coupled C-coupled j j ...

  • Page 6

    ... LA1145 Pin Description and Typical Voltages Pin No. Typical Voltage (V) 1 2.6 2 2.6 3 0.0 4 4.0 5 0.2 6 2.1 7 4.9 8 5.0 9 4.8 10 4.8 11 4.8 12 8.0 13 0.1 14 0.0 15 4.8 16 0.2 17 0.2 18 0.1 LA1145M Pin Description and Typical Voltages Pin No. Typical Voltage (V) 1 – 2 2.6 3 2.6 4 0.0 5 4.0 6 0.2 7 2.1 8 4.9 9 5.0 10 4.8 11 4.8 12 4.8 13 8.0 14 0.1 15 0.0 16 4.8 17 0.2 18 0.2 19 0.1 20 – LA1145, 1145M ...

  • Page 7

    ... LA1145 Pin Functions (1) Pin No. Function 1 IF input 2 Bias pin 3 GND Soft mute start point 4 control Soft muting gradient 5 control pin 6 Mute Att 7 FM-AF output 8 AFC input 9 IF output LA1145, 1145M Internal Equivalent Circuit IF limiting amp GND For setting the soft mute starting point. ...

  • Page 8

    ... LA1145 Pin Functions (2) Pin No. Function 10 IF input 11 Vref buffer output 14 GND 15 Mute driver 16 S-meter output 17 SD sensitivity setting 18 SD output LA1145, 1145M Internal Equivalent Circuit IF input via the phase shift circuit. The mute circuit malfunctions and demodulation output decreases if the voltage level at this pin drops below 180 mV ...

  • Page 9

    ... SD Output Circuit 1. LA1145 SD output differs from the LA1140’s pin substitute SD output as shown below. The SD output on the LA1145 does not operate in conjunction with the soft mute characteristics. 1) LA1140 Hole detector Signal meter Band mute 2) LA1145 Hole detector Signal meter Bandmute As shown, the SD output is the logical AND of the band mute and S-meter comparator outputs. ...

  • Page 10

    ... To prevent this, two threshold voltages should be used to control the SD circuit. SD sensitivity setting Band Mute Characteristics (1) Without C 17 Frequency, f – kHz LA1145, 1145M The input/output current from pin 8 becomes zero during return. and capacitor C. This time constant, AFC Mute driver pin for the 2nd threshold voltage. Band Mute Characteristics (2) ...

  • Page 11

    ... Soft mute transition response characteristic The degree of soft muting automatically varies according to the change in input field strength. Omitting the influence of the front end wideband AGC circuit, the LA1145’s response speed is dependent on the time constant at pins 15 and 16. I/O Characteristics (R IF input level, – dBµ ...

  • Page 12

    ... ANT input level – dBµ SD Sensitivity Temperature Characteristics Ambient temperature, Ta – °C SD Sensitivity Characteristics (IF input) (S-meter load resistor) SD sensitivity resistor value – I/O Characteristics IF input level – dBµ LA1145, 1145M I/O Characteristics Mute driver voltage ( ANT input level – dBµ –3 dB Limiting Sensitivity Temperature Characteristics Ambient temperature, Ta – ...

  • Page 13

    ... Attenuation setting resistor value – AFC Characteristics Frequency, f – kHz Current Drain Characteristics Muting IF input level – dBµ LA1145, 1145M Mute Driver Voltage IF input level – dBµ Load Resistance-Dependent Band Muting Load resistance – IF Count Output Characteristics IF input level – dBµ ...

  • Page 14

    ... Muting Attenuation Characteristics Supply voltage, V – Power Supply-Dependent Muting Bandwidth Supply voltage, V – LA1145, 1145M Power Supply-Dependent AMR Supply voltage, V Muting Sensitivity Using Hole Detection Output Supply voltage, V Power Supply-Dependent Mute Driver Voltage Supply voltage, V Tuning Point Shift Supply voltage, V – ...

  • Page 15

    ... IF input level – dBµ I/O Characteristics (R = 100 CT Pin 15 short IF input level – dBµ I/O Characteristics (R = 510 CT Pin 15 short IF input level – dBµ LA1145, 1145M I/O Characteristic (R Ambient temperature, Ta – °C ) I/O Characteristics (R Ambient temperature, Ta – °C ) I/O Characteristics (R Ambient temperature, Ta – °C ) S-Meter Characteristics (Temperature Characteristic) IF input level – ...

  • Page 16

    ... Ambient temperature, Ta – °C IF Count Output Level Shift IF input level – dBµ THD Detuning Characteristics AFC Detuning frequency – kHz LA1145, 1145M Muting Attenuation Characteristics Ambient temperature, Ta – °C AMR Temperature Characteristics Ambient temperature, Ta – °C THD Characteristic (Single Tuning Circuit AFC IF input level – ...

  • Page 17

    ... SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of February, 2002. Specifications and information herein are subject to change without notice. LA1145, 1145M No. 2725-17/17 ...