Ordering number : EN6075

30499RM (OT) No. 6075-1/17

Overview

The LA8520M is an I/O switching audio signal-processing
IC for use in facsimile units and telephones. It integrates a
crosspoint switch, a BTL power amplifier, an electronic
volume control, a microphone amplifier, and other
functions on a single chip.

Applications

Personal facsimile units and telephones

Functions

· Crosspoint switch (equivalent to an 8

8 switch)

· BTL power amplifier
· Electronic volume control
· Serial interface

Features

· Built-in BTL power amplifier (8 to 32

load): V

5 V, R

= 16

, Pomax = 250 mW

· Electronic volume control (BTL power amplifier

system: seven 4-dB steps, receiver amplifier system: two
3-dB steps)

· Low switching noise, low crosstalk characteristics

(crosspoint switch)

Package Dimensions

unit: mm

3129-MFP36SD

0.25

15.3

0.85

0.4

0.8

2.5max

2.25

0.1

7.9

9.2

10.5

0.65

SANYO: MFP36SD

[LA8520M]

LA8520M

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

Audio Signal-Processing IC with I/O Switching

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

max

Allowable power dissipation

Pd max

70°C

600

(Mounted on a glass-epoxy board: 114.3

76.1

1.6 mm

)

Operating temperature

Topr

20 to +70

°C

Storage temperature

Tstg

40 to +150

°C

Specifications

Maximum Ratings

at Ta = 25°C

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

Allowable operating supply voltage range

CCop

4.5 to 7.5

CCopbtl

4.5 to 9.0

Operating Conditions

at Ta = 25°C

No. 6075-2/17

LA8520M

Parameter

Symbol

Conditions

Ratings

Unit

min

typ

max

Crosspoint switch voltage gain

Gsw

Vin = 13 dBV

2.5

0.5

1.5

Crosspoint switch maximum input level

Vimax

THD = 1.5 %

dBV

Crosspoint switch output noise voltage

Nosw

20 to 20 kHz

µVrms

Microphone amplifier/TR amplifier voltage gain

Gmic

Vin = 53 dBV

Microphone amplifier/TR output distortion

THDmc

Vin = 53 dBV

0.6

1.5

Microphone amplifier/TR equivalent input noise

Nimc

Rg = 620

, 20 to 20 kHz

2.5

7.5

µVrms

voltage

Microphone amplifier/TR maximum voltage gain

Gmax

Receiver amplifier/OGM amplifier voltage gain

Gre

Vin = 33 dBV

Receiver amplifier/OGM amplifier output

THDre

Vin = 33 dBV

0.4

1.5

distortion

Operational amplifier voltage gain

Gop

Vin = 13 dBV

Operational amplifier output distortion

THDop

Vin = 13 dBV

0.4

1.5

DR amplifier output level

Vodr

Vin = 23 dBV, IN(8), OUT(32), sw(10) on

16.1

13.6

11.1

dBV

DR amplifier output distortion

THDdr

Vin = 23 dBV, IN(8), OUT(32), sw(10) on

0.5

1.5

Handset amplifier output level

Vohd

Vin = 16 dBV, IN(9), OUT(34), sw(0B) on

+0.5

dBV

Handset amplifier output distortion

THDhd

Vin = 16 dBV, IN(9), OUT(34), sw(0B) on

0.55

1.5

Handset amplifier attenuator level 1

Att1

address (51)

2.3

3.7

Handset amplifier attenuator level 2

Att2

address (52)

3.45

4.15

4.85

Handset amplifier attenuator level 3

Att3

address (53)

5.4

6.1

6.8

Electronic volume control output level

Voevr

Vin = 20 dBV, IN(9), OUT(28), sw(2D) on

22.9

20.4

17.9

dBV

Electronic volume control step size

Wevr

Vin = 20 dBV, IN(9), OUT(28), sw(2D) on

2.9

3.8

4.6

Electronic volume control output noise voltage

Noevr

20 to 20 kHz, OUT(28)

µVrms

[BTL Power Amplifier]

Voltage gain

Gpwr

Vin = 20 dBV, R

= 16

18.2

19.7

21.2

Total harmonic distortion

THDpw

Vin = 30 dBV, R

= 16

0.7

1.5

Maximum BTL output power

Pomax

THD = 10 %, R

= 16

250

400

Ripple rejection ratio

SVRR

Rg = 620

, frin = 100 Hz, Vrin = 20 dBV,

= 16

Output noise voltage

Nopw

Rg = 620

, 20 to 20 kHz, R

= 16

µVrms

[CPU Interface]

Clock frequency

Fck

500

kHz

Input signal high level

Input signal low level

1.5

REF

and Current Drain]

Internal reference voltage (the pin 10 voltage)

Vref

2.1

2.25

2.4

Quiescent current 1

Icco1

With the BTL power amplifier on and the

crosspoint switch off

Quiescent current 2

Icco2

With the BTL power amplifier off and the

14.5

crosspoint switch off

Electrical Characteristics

at Ta = 25°C, V

= 5 V, fin = 1 kHz, R

= 10 k

Serial Data Format

A6 to A0: Setting for the crosspoint switch and control switch address (hexadecimal

binary)

Controls the on/off state of the crosspoint switch and control switch.

D = 1:

Crosspoint switch on, BTL amplifier on

D = 0:

Crosspoint switch off, BTL amplifier off
(The electronic volume control and attenuator can be set to either 0 or 1.)

Other addresses

Address

Mode

All crosspoint switches off, default settings for the control switches

BTL power amplifier on (The default state is off.)

Electronic volume control

0 dB

Default setting

Electronic volume control

4 dB

Electronic volume control

8 dB

Electronic volume control

12 dB

Electronic volume control

16 dB

Electronic volume control

20 dB

Electronic volume control

24 dB

Electronic volume control

28 dB

Handset amplifier attenuator

0 dB

Default setting

Handset amplifier attenuator

3 dB

Handset amplifier attenuator

4 dB

Handset amplifier attenuator

6 dB

No. 6075-5/17

LA8520M

Address table

Input - Output

LINE

HAND

RF1

RF2

DOOR

AUX

EVR

RE.

TR.

RF1

RF2

DOOR

AUX

MIC

OGM

Usage Notes

· Microphone and TR amplifiers

Since these two amplifiers are designed for high gain (they support gains up to 40 dB), they cannot be used as buffer
amplifiers. Use at lower gains may result in loss of phase margin and oscillation. Therefore, the gain must be set to a
value of at least 6 dB.

· Handset amplifier output (pin 34)

A resistor (of at least 150

) must be inserted in series if this output is connected directly to a dynamic speaker.

· BTL power amplifier

The phase compensation capacitor C4 is not required if the high-frequency noise reduction capacitor C1 is not used.
Also, the phase compensation capacitors C2, C3, and C4 should be placed as close as possible to the IC pins, with C2
located the closest.

· Inter-pin shorting

This IC may be damaged or destroyed if power is applied with any pins shorted together. Therefore, when mounting
this IC to a printed circuit board always check for pin shorting caused by stray solder or any other foreign material
before applying power.

· Load shorting

This IC may be damaged or destroyed if it is operated for extended periods with the load shorted. Do not allow the load
to be shorted.

· The slightest fluctuations in operating conditions may cause the ratings to be exceeded if this IC is operated in the

vicinity of the maximum ratings. Since this can lead to destruction of the device, applications must be designed with
adequate margins with respect to the power-supply voltage and other parameters so that the maximum ratings are never
exceeded.

No. 6075-7/17

LA8520M

Input

No. 6075-8/17

LA8520M

Pin Functions

Pin No.

Notes

Equivalent circuit

voltage (V)

RE amplifier noise filter

RE amplifier output

OGM amplifier output

OGM amplifier noise filter

Operational amplifier noise filter

Operational amplifier output

RE-NF

RE-OUT

OGM-OUT

OGM-NF

OP-NF

OP-OUT

2.25

TR amplifier output

TR amplifier minus input

TR amplifier plus input

Microphone amplifier plus input

Microphone amplifier minus input

Microphone amplifier output

TR-OUT

TR-NIN

TR-PIN

MIC-PIN

MIC-NIN

MIC-OUT

2.25

RF1 input

RF2 input

Auxiliary input

RF1-IN

RF2-IN

AUX-IN

2.25

Door phone input

DR-IN

2.25

Continued on next page.

Unit (resistance:

)

No. 6075-9/17

LA8520M

Continued from preceding page.

Pin No.

Notes

Equivalent circuit

voltage (V)

Internal circuit reference voltage (about 2.25 V)
· Circuits other than the BTL amplifier operate

using this potential as a reference.

VREF

2.25

Chip enable input

Data input

Clock input

BTL power amplifier output 1

BTL power amplifier minus input

P-OUT1

P-IN

0.44 V

BTL power amplifier output 2

BTL power amplifier reference voltage

P-OUT2

P-VREF

0.44 V

Continued on next page.

To 27 pin

To 24 pin

Unit (resistance:

)

No. 6075-10/17

LA8520M

Continued from preceding page.

Pin No.

Notes

Equivalent circuit

voltage (V)

Electronic volume control output

VR-OUT

2.25

Auxiliary output

Door phone output

RF2 output

RF1 output

Line output

AUX-OUT

DR-OUT

RF2-OUT

RF1-OUT

LN-OUT

2.25

Handset amplifier noise filter

Handset amplifier output

HD-NF

HD-OUT

2.25

Ground

Power amplifier power supply

Power amplifier ground

Power supply

GND

P-V

P-GND

5 V applied

Unit (resistance:

)

PS No. 6075-17/17

LA8520M

This catalog provides information as of March, 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.

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: LA8520