la1136nm Sanyo Semiconductor Corporation, la1136nm Datasheet

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la1136nm

Manufacturer Part Number
la1136nm
Description
Am Tuners For Car Radios And Home Stereos
Manufacturer
Sanyo Semiconductor Corporation
Datasheet
Ordering number: EN 3507
Overview
The LA1136N/NM and LA1137N/NM are high-performance
AM electronic tuner ICs offering sophisticated functions. They
are especially suited for use in car radio and home stereo
(antenna: loop) applications.
Functions
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MIX
OSC (with ALC)
IF amplifier
Detector
AGC (normal)
RF wide-band AGC
Auto search stop signal (Signal meter output)
Local oscillation buffer output
IF band switching circuit (for LA1136N only)
IF count buffer
Stop detector output (can be set independently)
Tweet prevention circuit
AGC (RF, IF) time constant switching circuit
IF AGC circuit
Pin-diode driver
AM stereo decoder IF output (for LA1136N only)
Circuit preventing incorrect seek operation
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
AM Tuners for Car Radios and Home Stereos
LA1136N, 1136NM, 1137N, 1137NM
Features
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AM stereo capability (LA1136N only)
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Excellent cross modulation characteristic: Meets the
requirements for preventing not only adjacent-channel
interference but also interference caused by all channels
within broadcast band.
Narrow-band signal meter output: Usable as auto search stop
signal. Has linearity up to 100 dBµ.
Local oscillation buffer output: Facilitates designing of
electronic tuner system, frequency display, etc.
OSC (with ALC): Improves tracking error because
oscillation output is stabilized at a low level (350 mVrms:
LA1137N) for varactor diode.
MIX: Double-balanced differential MIX meeting the
requirements for preventing spurious interference, IF
interference.
Good characteristic at high input: 130 dBµ input
fm = 400 Hz 80%mod THD = 0.5% typ.
High S/N: Good S/N at medium input (55 dB typ).
Usable sensitivity: (S/N = 20 dB input): 25 dBµ
(when using 2SK715 )
V
distortion: 8 to 12 V
IF band switching circuit on chip; controlled by
microcontroller
Oscillating circuit for AM stereo; SUB S/N improved to
6 dB
IF output for AM stereo decoder
Improved tweet characteristics: 10 dB increase, controlled by
microcontroller
Improved cross modulation characteristics, especially
sensitivity suppression characteristics: 15 dB improvement,
wide-band AGC operation even for SW band interference
Improved low-frequency modulation distortion
Improved temperature characteristics: S-meter, SD sensitivity
Faster RF AGC response: RF: 1/3; IF: 1/8 (compared to
predecessors)
Improved capability for driving external RF AGC transistors:
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Measures to prevent incorrect seek operation
B
CC
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max = 200 µA
IF count buffer on chip; controlled by microcontroller
Time constant switching circuit on chip for RF and IF
AGC
IF AGC clear circuit on chip
Measures that prevent stopping one station too soon
variation compensation: Less variation in gain,
93097HA(II)/4281TS(US) No.3507-1/28
Monolithic Linear IC

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la1136nm Summary of contents

Page 1

Ordering number: EN 3507 Overview The LA1136N/NM and LA1137N/NM are high-performance AM electronic tuner ICs offering sophisticated functions. They are especially suited for use in car radio and home stereo (antenna: loop) applications. Functions . . MIX OSC (with ALC) ...

Page 2

... Pd max – Ta Ambient temperature, Ta – °C LA1136N, 1136NM, 1137N, 1137NM unit : mm 3112-MFP24S SANYO : DIP24S unit : mm 3036B-MFP20 SANYO : DIP20Slim Mounted on 20 Independent IC [LA1136NM] SANYO : MFP24S [LA1137NM] SANYO : MFP20 Pd max – 1.5 mm PCB Ambient temperature, Ta – °C No. 3507-2/28 ...

Page 3

... Pin 6+13+19 (LA1136N) 14 Pin 20 (LA1137N), Pin 24 (LA1136N 65°C (LA1136N 77°C (LA1137N) Independent IC 47°C (LA1136NM) With PCB 80°C (LA1136NM) Independent IC 63°C (LA1137NM) With PCB 77°C (LA1137NM) Conditions op Pd max – 1.5 mm PCB Ambient temperature, Ta – °C ...

Page 4

... LA1136N, LA1136NM Operating Conditions 25°C, V Parameter Symbol Current drain Detection output Signal-to-noise ratio AGC figure-of-merit THD1 Total harmonic distortion THD2 Signal meter output voltage Stop detector sensitivity Local-oscillator buffer output voltage BUFF IF buffer output voltage count buffer output voltage ...

Page 5

... LA1136N, LA1136NM Test Circuit LA1136N, 1136NM, 1137N, 1137NM No. 3507-5/28 ...

Page 6

LA1137N, LA1137NM Test Circuit LA1136N, 1136NM, 1137N, 1137NM No. 3507-6/28 ...

Page 7

LA1136N Equivalent Circuit LA1136N, 1136NM, 1137N, 1137NM No. 3507-7/28 ...

Page 8

LA1137N Equivalent Circuit LA1136N, 1136NM, 1137N, 1137NM No. 3507-8/28 ...

Page 9

LA1136N Sample Application Circuit LA1136N, 1136NM, 1137N, 1137NM LA1136N No. 3507-9/28 ...

Page 10

LA1137N Sample Application Circuit LA1136N, 1136NM, 1137N, 1137NM No. 3507-10/28 ...

Page 11

LA1136N, LA1137N Pin Specifications (Pins connected to an external microcontroller) (1) IF Band Switching : Pin 12 Narrowband : 3 greater Wideband : 2 lower (2) Seek Detection : Pin 14 Station seek : 3.5 V ...

Page 12

LA1136N, LA1137N Usage Notes 1. Do not connect the antenna alignment circuit and local oscillation circuit. 2. The coils should be specified to obtain an output level of –25 dBm (43.6 mVrms) for the given input levels shown below, and ...

Page 13

Oscillator coil The oscillator for LA1136N and LA1137N can operate up to 100 MHz. Stray capacitance resulting from poor oscillator coil design can cause antiresonance in the range 50 to 100 MHz. This results inparasitic oscillations at the local-oscillator ...

Page 14

Oscillator coil For use with SVC321, triple varactor diode For use with quad varactor diode (3) Mixer coil Center frequency (4) IF tank coil Center frequency LA1136N, 1136NM, 1137N, 1137NM No. 3507-14/28 ...

Page 15

Sample RF alignment coil selectivity characteristics (Mitsumi) New coil designs should have the same selectivity characteristics as shown below. RF characteristics at 600 kHz 5. Problems Concerning Wideband AGC Because the LA1136N and the LA1137N offer many sophisticated functions, ...

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Wideband AGC Sensitivity The wideband AGC circuit two-signal sensitivity and shortwave interference suppression characteristics have been achieved by reducing the sensitivity by approximately 10 dB from that of previous devices FET with low gm and high I ...

Page 17

Application Circuit using the IF count method The LA1136N and LA1137N can be configured for tuning using either the stop detector or the IF count method. The application circuits are examples of tuners using the IF count method. The ...

Page 18

Stop Detector Adjustment Although this explanation is for the LA1137N identical for the LA1136N, except that the pin numbers are different. The LA1137N is designed for use with the following microcontrollers. Stop detection method: LM7001 (Sanyo) (SD ...

Page 19

SD sensitivity adjustment method The SD sensitivity is determined by the voltage level of the two inputs to the comparator. Because the absolute value is determined by the resistor as described above, no matter which level, the sensitivity can ...

Page 20

Methods for improving tweet characteristics 1 A twin varactor diode can be used used for FM detection. However, the chip size is four times that of a standard varactor diode having the same capacitance, resulting in increased ...

Page 21

The accurate voltages for each pin During seek: When the voltage of pin 11 is HIGH 5 V, transistor and transistors N3, N4, N6, N7, N8 and N9, OFF. Pin 18 is connected to the collector ...

Page 22

Preventing Incorrect RF AGC time-constant switching, Seek Operation These tuners incorporate various circuits that serve to prevent incorrect stops during seek operation. A summary of the RF amplifiers is provided below. (1) Incorrect stops during RF AGC, and other ...

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Gain Adjustment Method (1) AGC Operations The AGC circuits for LA1136N and LA1137N are configured based on the AGC circuit for LA1135. Although this explanation is for the LA1137N identical for the LA1136N, except that the pin ...

Page 24

RF alignment coil In general, the RF amplifier gain and fluctuations in the effective sensibility should be kept as low as possible. Turns proportional to gain Check the data in the diagram to determine the number of turns. 19. ...

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LA1136N, 1136NM, 1137N, 1137NM For SD sensitivity Fidelity Characteristics Modulation frequency, fm [Hz] Detection Output, THD – V Characteristics S Detection output Modulation depth, V [%] S Selectivity Characteristics Difference frequency, f [kHz] When ...

Page 26

LA1136N, 1136NM, 1137N, 1137NM Band Characteristics (Tracking adjustment at each point) IF interference ratio Image interference ratio Effective sensitivity (ANT input when S dB) Maximum Sensitivity (ANT input when output –25 dBµ) (using varactor diode) Receive, fr [kHz] ...

Page 27

LA1136N, 1136NM, 1137N, 1137NM Temperature Characteristics IF buffer output (74 dBµ Input, zero modulation) Oscillator buffer (Quiescent) IF count buffer output (30 dBµ Input, zero modulation) Stop detector count buffer leakage (74 dBµ ...

Page 28

Cross-modulation Characteristics Target input Interference input Target input Interference input Interference input [dBµ] No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, ...

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