Datasheet LA1838 Datasheet (SANYO)

Ordering number : EN5888

40999RM (OT) No. 5888-1/9

Overview

The LA1838 is designed for use in home stereo systems and is a single-chip tuner IC that provides electronic tuning functions for AM, FM IF, and MPX reception. It is optimal for use in products that adopt an automatic tuning system based on an IF count.

Functions

• AM: RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, oscillator buffer, S-meter, narrow-band SD, IF buffer

• FM IF: IF amplifier, quadrature detector, S-meter, SD (signal detection), S-curve detection, IF buffer output

• MPX: PLL stereo decoder, stereo display, forced monaural, VCO stop, post amplifier, audio muting, adjacent channel interference rejection function

Features

• Integrated MPX VCO (External components are no longer required.)

• Built-in adjacent channel interference rejection function (third and fifth order)

• Adjustment-free FM detector circuit (Uses a ceramic discriminator.)

• The AM and FM SD sensitivities can be set independently.

• The AM and FM output levels can be set independently.

• Improved useable AM sensitivity and strong field distortion characteristics.

Package Dimensions

unit: mm

3061-DIP30S

1

15

30

16

1.15 1.78

27.2

0.25

10.16

8.6

0.48 0.95

4.25

3.2

4.95max

0.51min

SANYO: DIP30S

[LA1838]

LA1838

SANYO Electric Co.,Ltd. Semiconductor Company

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

Single-Chip Home Stereo IC with Electronic

Tuning Support

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.

-40

0

300

200

100

400

-20

500

550

600

20 60 10004080

Ambient temperature, Ta —°C

Allowable power dissipation, Pdmax — mW

Pdmax-Ta

Specifications

Maximum Ratings at Ta = 25°C

Operating Conditions at Ta = 25°C

Operating Characteristics at Ta = 25°C, VCC= 9 V, in the specified test circuit.

No. 5888-2/9

LA1838

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

CC

max 12 V Allowable power dissipation Pd max Ta ≤ 70°C 550 mW Operating temperature Topr –20 to +70 °C Storage temperature Tstg –40 to +125 °C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

CC

9 V

Operating supply voltage range V

CC

op 7 to 11 V

Parameter Symbol Conditions

Ratings

Unit

min typ max [FM Mono Characteristics] fc = 10.7 MHz, fm = 1 kHz Current drain I

CCO-FM

With no input signal 18 31 44 mA

Demodulator output V

OFM

100 dBµ, 100% modulation, the pin 16 output 730 1100 1460 mVrms

Channel balance C.B-mono

100 dBµ, 100% modulation, the pin 16 output/the

–1.5 0 +1.5 dB

pin 17 output

Total harmonic distortion (mono) THD

FM

100 dBµ, 100% modulation, the pin 16 output 0.3 1.5 %

Signal-to-noise ratio S/N

FM

100 dBµ, 100% modulation, the pin 16 output 70 77 dB

AM rejection ratio AMR 100 dBµ, AM 30% modulation, the pin 16 output 40 55 dB

Input limiting voltage –3dBL.S

100 dBµ, 100% modulation, referenced to the output,

26 32 38 dBµ

the input when the output is down by –3 dB

LED indicator on sensitivity SD

On-FM

47 57 67 dBµ

LED indicator on bandwidth SD

BW

100 dBµ 130 210 300 kHz

IF counter buffer output V

IFBuff-FM

100 dBµ, the pin 13 output 80 120 160 mVrms

S-meter output

V

SM-FM1

0 dBµ, the pin 11 output 0 0.1 0.5 V

V

SM-FM2

100 dBµ, the pin 11 output 3.6 4.3 5.0 V Mute attenuation Mute-Att 100 dBµ, 100% modulation, the pin 16 output 75 85 dB [FM Stereo Characteristics] fc = 10.7 MHz, fm = 1 kHz, L + R = 90%, Pilot = 10%, 100 dBµ Separation (left) SepLLeft channel modulated. The pin 16 output/the pin 17 output 30 45 dB Separation (right) SepRRight channel modulated. The pin 17 output/the pin 16 output 30 45 dB Stereo on level ST

ON

The pilot modulation such that V7 falls under 0.7 V 1.3 2.7 5 % Stereo off level ST

OFF

The pilot modulation such that V7 rises to over 4.5 V 1.5 % Total harmonic distortion (main) THD-main Left + right modulation. The pin 16 output. 0.3 1.5 %

fs = 113 kHz, Vs = 90%, pilot = 10%

Brej-3rd The left - right modulation 1 kHz demodulated output 40

dB

Adjacent channel rejection ratio

with respect to the pin 16 output

fs = 189 kHz, Vs = 90%, pilot = 10%

Brej-5th The left - right modulation 1 kHz demodulated output 40

dB

with respect to the pin 16 output [AM Characteristics] fc = 1000 kHz, fm = 1 kHz Current drain I

CCO-AM

With no input signal 15 25 35 mA

Detector output

V

OAM1

23 dBµ, 30% modulation, the pin 16 output 100 180 360 mVrms

V

OAM2

80 dBµ, 30% modulation, the pin 16 output 200 320 500 mVrms

Signal-to-noise ratio

S/N

AM1

23 dBµ, 30% modulation, the pin 16 output 18 22 dB

S/N

AM2

80 dBµ, 30% modulation, the pin 16 output 49 55 dB

Total harmonic distortion

THD

AM1

80 dBµ, 30% modulation, the pin 16 output 0.4 1.2 %

THD

AM2

80 dBµ, 80% modulation, the pin 16 output 1.0 4.0 % LED indicator on sensitivity SD

On-AM

17 27 37 dBµ

Local oscillator buffer output V

OSC-AM

With no input signal, the pin 30 output 110 160 220 mVrms IF counter buffer output V

IFBuff-AM

80 dBµ, 100% modulation, the pin 13 output 160 220 300 mVrms ST - IF output V

STIF-AM

80 dBµ, 100% modulation, the pin 7 output 16 34 48 mVrms S-meter output V

SM-AM

0 dBµ, 100% modulation 0 0 0.2 V

Block Diagram

AC Test Circuit

No. 5888-3/9

LA1838

ALC

V

CC

GND

AGC

DETAM IF

FM I F

REG

L.P.F

MUTE

BUFF

AM

OSC

AM

MIX

AM

RF.AMP

AM

S-METER

DECODER

ANTI

-

BIRDIE

AM/FM

IF-BUFF

TUNING

DRIVE

STEREO

DRIVE

FM

S-METER

S-CURVE

SD

COMP

FM

DET

T00147

30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

P-DET

STEREO

SW

VCO

304kHzFF38k

FF

19k

∠

2

-

π

FF

19k

∠θ

PILOT

DET

+

++

+

L.P.F

+

OSC BUFF

FM IN (10.7MHz)

AM IFT

TU

-

LED

ST

-

LED

AM

-

IF

FM V

SM

AM V

SM

(SD

-

ADJ)

AM/FM

IF

-

BUFF

MUTE

AM NARROW

SD

VT

FM SD

ADJ

AM AGC

AM-STEREO L/R-INPUT

OSC

RF

FM SD BAND-W

L

-

OUT

R

-

OUT

R

AM

MONO

V

CC

FM ST

0.047µF

0.047

µ

F

0.047

µ

F

0.047

µ

F

0.047

µ

F

10

µ

F

0.47

µ

F

SEEK1000pF

1

µ

F

1

µ

F

1

µ

F

1000pF

47

µ

F

0.047µF

0.01µF

0.033

µ

F

10

µ

F

10

µ

F

0.033

µ

F

10µF

0.047

µ

F

0.047µF

33

µ

F

3.3

µ

F

22

µ

F

1000pF

39pF

20pF

1000pF

39mH

3k

Ω

50

Ω

18k

Ω

3.3kΩ3.3k

Ω

5.1k

Ω

300

Ω

75

Ω

68k

Ω

330

Ω

51

Ω

68k

Ω

5k

Ω

5k

Ω

5k

Ω

10k

Ω

3k

Ω

L.P.F

T00148

30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

+

+ +

+

L.P.F

+

OSC

BUFF

(1.45MHz)

FM IN (10.7MHz)

SD ST

AM

-

ST

V

SM

V

SM

NORMAL

AM-IN (1MHz)

OSC

REG

AFC

L

-

OUT

R

-

OUT

MONO

V

CC

FM

AM

STEREO

450kHz

( )

FM

AM

V

DD

IF

-

BUFF

9.0V

LA1838

T1

T2

CDA10.7MGI-C (For use as the DUT socket board)

The CDA10.7MG74 must be used for actual production models. (Series resistance: 270 Ω)

*

T1: HW-50425 T2: YD-1073-1

Pin No. Pin function Pin voltage Notes Equivalent circuit

Vreg – 1.4

V

CC

Vreg

Coil Specifications

• AM oscillator (for the DUT) HW-50425 (Mitsumi)

Pin Functions

• IFT YD-1073-1 (Mitsumi)

No. 5888-4/9

LA1838

3

1

2

4

6

A10633

➂ - ➁ 2T ➃ - ➅ 9T ➁ - ① 86T

Q

O

≥ 80

L = 270 µH

3

1

2

4

S

6

YD-1073

SFU450B

A10634

➁ - ① 58T ➃ - ➅ 7T ➁ - ➂ 94T

f

O

= 450 kHz

Q

O

= 110

A 180-pF capacitor is built in With an external SFU450B

FM IF input

AM mixer output

1

2

Input impedance ri= 330 Ω

Connect the mixer coil between this pin and V

CC

1

3

A10635

2

A10636

1

3

A10635

Vreg

FM IF input bypass

3 Also used for the MPX regulator filter

4

A10637

Vreg

0 V

AM IF input

GND

4

5

Input impedance ri= 2 kΩ

6 7

A10638

V

CC

V

CC

TU-LED ST-LED, AF-IF output

6 7

Active low Open collector AM stereo IF output (pin 7) The influx current must be held under 150 µA.

A10639

9

28

V

CC

FM detector9

The CDA10.7 MG74 (Murata Mfg. Co., Ltd.) is recommended as the ceramic discriminator. A device with a series resistance of 270 Ω must be used.

V

CC

8

Continued on next page.

Continued from preceding page.

No. 5888-5/9

LA1838

Pin No. Pin function Pin voltage Notes Equivalent circuit

1.3 V

AM narrow band CF connection

10

Recommended narrow band CF: BFU450 C4N (Murata Mfg. Co., Ltd.)

When the narrow band SD function is not used, bypass this circuit with a 50 Ω resistor and a

0.047 µF capacitor in series.

10

A10640

0 VFM S-meter output11

RL= 8 kΩ

11

A10641

0 V (AM)

AM S-meter output

12

The AM SD sensitivity is adjusted with an external resistor connected between this pin and ground

12

28

A10642

0 V

AM/FM IF buffer output,

Output control switch (mute switch)

13

V13 ≤ 0.5 V: Reception state

1.4 V ≤ V13 ≤ 2.2 V: IF buffer output on V13 ≥ 3.5 V: IF buffer output and muting on

13

A10643

VCC– 1.4 (FM) 0 V (AM)

Phase comparator low-pass filter (AM/FM switching)

14

The device operates in AM mode when this pin is connected to ground through a resistor.

Limit values for the resistor:

2.7 kΩ (When VCC= 7 V)

3.9 kΩ (8 V), 5.1 kΩ (9 V)

6.2 kΩ (10 V), 7.5 kΩ (11 V)

14

A10644

VCC– 1.0

Pilot detector lowpass filter (Forced mono) (VCO stop)

15

The device is forced to monaural when a current of over 50 µA flows from this pin.

The VCO is stopped if this pin is connected to ground.

The limit values for the resistor are the same as those for pin 14.

15

A10645

Vreg Vreg

Post-amplifier inputs and outputs

16 17 18 19

Output impedance r

o

= 200 Ω

Pin 16: Right output, pin 17: Left output Inverting input pins

Pin 18: Right input, pin 19: Left input RNF= 33 kΩ

1618

19 17

A10646

3.5 V

MPS outputs

20 21

Output impedance r

o

= 3.3 kΩ Pin 20: Right deemphasis Pin 21: Left deemphasis

20 21

A10647

Continued on next page.

Continued from preceding page.

No. 5888-6/9

LA1838

Pin No. Pin function Pin voltage Notes Equivalent circuit

2.9 VMPX input22

Input impedance ri= 20 kΩ

22

A10648

2.8 V (FM)

2.8 V (AM)

FM demodulator output

23

Output impedance r

o

= 3.0 kΩ The channel separation can be adjusted with an

external capacitor connected between this pin and ground.

The VOsub/VOmain ratio is set to be about 0 dB.

23

A10649

0 V (FM)

0.5 V (AM)

AM detector output

24

Output impedance r

o

= 3.3 kΩ The AM frequency characteristics can be adjusted

by modifying the time constant of the circuit connected between this pin and pin 22 and between this pin and ground.

A10650

24

0 V (FM)

0.5 V (AM)

AM AGC25 The resistance of the built-in resistor R is 11 kΩ

25

A10651

VregAFC26

The FM SD bandwidth can be adjusted with the external resistor connected between this pin and pin 28

26

A10652

VregAM RF input27 Must be used at the same potential as pin 28

27

A10653

VregREG28 Vreg = 3.6 V

28

A10654

VregOSC29

Connect the oscillator coil between this pin and pin 28

29

A10655

1.6 V (FM)

1.3 V (AM)

Oscillator buffer output,

FM SD sensitivity adjustment

30

The FM SD sensitivity can be adjusted with an external resistor connected between this pin and ground.

Output impedance ro= 200 Ω

30

A10656

No. 5888-7/9

LA1838

Vobat — dB

Distortion vs. Frequency Characteristics

Separation vs. Frequency Characteristics

Frequency, freq — kHz

Frequency, f

s

—

kHz

Frequency, freq — kHz

Adjacent Channel Rejection Ratio

0

70 90 110 130 150 170 230210190

-10

-20

-30

-40

-50

-60

-70

-80

-90

0.01

0.01 2 3 5 7

0.1

2

3

5

7

2

3

5

7

2

3

5

7

1.0

10

2 3 5 7 2 3 5 7 2 3

0.1 1.0 10

0.01

0

5

10

40

50 45

2

20 15

3255307

35

2 3 5 7 2 3 25 7

0.1 1.0 10

Total harmonic distortion, THD — %

Channel separation, Sep — dB

Capture Range Characteristics

Pilot — mV

SD Sensitivity Adjustment

Rsdadj — kΩ

Capture range — %

SD on — dBµ

0

90 80

30 20 10

40

2

50

60

70

6 10 164 8 12 14

10

-6

6

0

-2

-4

2

4

4020 30

12 30

AM FM

CR+

CR-

FM

AM

Overall FM Characteristics

Output, — dBm

Input, — dBµ

10

0

0 20 40 60 80 100 120

-10

-20

-30

-40

-50

-60

-70

-100

-90

-80

Out

AMOut

Noise

V

CC

= 9 V

f

c

= 10.7 MHz

f

m

= 1 kHz,75 kHzdev

AM = 30% mod

FM THD and VSM Characteristics

Input, — dBµ

Total harmonic distortion, THD — %,

S-meter output, V

SM

— V

5

0 10 20 30 40 50 60 70 80 90 110100 120

4

3

2

0

1

V

SM

THD

FM THD vs. Band Characteristics

Frequency, fc — MH

10.6010.62 10.64 10.66 10.68 10.72 10.74 10.76 10.7810.70 10.80

3.0

4.0

2.0

0

1.0

5.0

Total harmonic distortion, THD — %

V

CC

= 9 V

V

IN

= 100 dBµ

f

m

= 1 kHz, 75 kHzdev

MONO

MAIN

ST

SUB

AM

Sep-R

Sep-L

IF = 10.7 MHz, 100 dBµ, 75 kHzdev V

S

=

90% PILOT = 10% Referenced to the L-R demodulated output

LA1836

LA1838

No. 5888-8/9

LA1838

Distortion vs. Ambient Temperature Characteristics

Output voltage, V

O

—

dBV

Output voltage, V

O

— dBV

Frequency, fm — kHz

Ambient temperature, Ta — °C

Frequency, fm — kHz

Ambient temperature, Ta — °C

0.01

-40

-10

-5

2

-30

-35

3

-25

5

-20

7

-15

2 3 5 7 2 3 25 7

0.1 1.0 10

0.01

-40

-10

-5

2

-30

-35

3

-25

5

-20

7

-15

2 3 5 7 2 3 25 7

0.1 1.0 10

-40

0.1

1.0

2

-20

3

5

7

20 60 1000 40 80

-40

0

90 80

30 20 10

40

-20

50

60

70

20 60 1000 40 80

0

Channel separation, Sep — dB

Total harmonic distortion, THD — %

AM Detector Output Frequency Characteristics (1)

AM Detector Output Frequency Characteristics (2)

Separation vs. Ambient Temperature Characteristics

Sep-L

Sep-R

S/NMono

THDMono

THDMain

THDst

THDsub

S/NStereo

24 22

0.01 µF

R

24 22

R

C

C = 0.022 µ

C = 0.047 µ

C = 0.01 µ

R = 10 k

R = 33 k

R = 18 k

Overall AM Characteristics

AM THD and V

SM

Characteristics

Input, — dBµ

Input, — dB

Output, — dBm

Total harmonic distortion, THD — %

S-meter output, V

SM

— V

5.0

4.0

4.5

3.5

3.0

2.5

2.0

1.5

1.0

0.5 0

0 20-20 40 60 80 100 120 140

0

0 20-20 40 60 80 100 140120

-10

-20

-30

-40

-50

-60

-70

-80

THD = 30%mod

THD = 80%mod

Out

V

SM

Noise

V

CC

= 9 V

f

c

= 1 MHz

f

m

= 1 kHz,30%mod

VCC = 9 V f

c

= 1 MHz

f

m

= 1 kHz, 30%mod

0

350

300

50

2

150

100

200

250

6 10 2018164 8 12 14

SD Band Adjustment Characteristics

Radj — kΩ

SD BW — kHz

No. 5888-9/9

LA1838

This catalog provides information as of April, 1999. Specifications and information herein are subject to change without notice.

Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer’s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer’s products or equipment.

SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design.

In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law.

No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd.

Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification” for the SANYO product that you intend to use.

Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. 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.