Sanyo LA8515N Specifications

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.

Monolithic Linear IC

Telephonic Speech Network

Ordering number:ENN3301A

LA8515N

SANYO Electric Co.,Ltd. Semiconductor Company

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

Overview

The SANYO LA8515N telephonic speech network provides
amplification, switching and line drive functions for tele­phone equipment. It can perform 2 to 4 line conversion and
impedance matching, and supports both DTMF and keytone
signals.
The LA8515N’s low operating current reduces line load.
Switching between the DTMF/keytone and voice circuits
is controlled directly from a single MUTE input.

The LA8515N is available in plastic 20-pin DIPs.

Features

• Direct connection to low-impedance receiver.

• DTMF/keytone and voice circuit switching controlled by
a single MUTE input.

• Receive and transmit gain are adjusted automatically in
response to the line current.

• Applicable to a wide v ariety of tr ansmitters and receivers
by selecting external components.

Specifications

Maximum Ratings at Ta = 25˚C

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Package Dimensions

unit:mm

3021C-DIP20

[LA8515N]

24.0

20

1

1.0

(0.57)

2.54

0.5

1.2

11

7.62

10

(3.25)

0.51min

SANYO : DIP20

6.4

0.25

3.9max

3.3

˚C
˚C

Operating Characteristics at Ta = 25˚C, f=1kHz, See specified Test Circuit.

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Am05=1.6V

L

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Am021=3.21V

L

I

Am02=1.2V

L

I

Am05=6.3V

L

I

Am021=1.7V

L

12501TN (KT)/D159TA/O319TA, TS (US) No.3301–1/6

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V,Am02=

NI

V,Am021=

V,Am02=

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V,Am021=

V,Am02=

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V,Am021=

Am05=42kΩ
Am05=71kΩ

Am02=56.0V
Am05=31.1V

Am021=1.2V

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VBd55–=5373Bd

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VBd02–=4–2–0Bd

VBd02–=5.9–7–5–Bd

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VBd03–=325272Bd

VBd03–=0222Bd

NI

%4=DHT,Am02=5.2p-pV

%4=DHT,Am021=6.4p-pV
%01=DHT,Am02=3.0p-pV

%01=DHT,Am021=5.0p-pV

Am021otAm02=5.1V
Am021otAm02=02.0V

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Equivalent Circuit Block Diagram

No.3301–2/6

Test Circuit

LA8515N

Sample Application Circuit

No.3301–3/6

LA8515N

Pin Functions

Pin Number Pin Name Description

1V

2TOITransmit output current source, input side

3TOOTransmit output current source, output side

4 Not used.

5 AC BIAS AC signal reference voltage

6 DTMF DTMF input

7 MUTE Mute control input

8 REF Reference voltage

9 GND Ground

10 KTI Key tone input

11 TPI

12 TPI

13 TP
14 PADC Pad control input

15 RPI

16 RPI

17 RP
18 R

19 NC No connection
20 V

Line voltage

L

Connected to the positive side of the line diode bridge. See the application circuit.

Connected to V

through a 27Ω resistor. Select the value of this resistor after considering the maximum expected line

L

current.

As above, but to ground through a 15Ω resistor.

This pin has a DC bias and should not be connected.

An internally-generated reference voltage.

The signal on this pin is output on V
since it is biased with the REF voltage.

Switches between the transmit side DTMF or receive side keytone, and voice circuits.
LOW : DTMF output, keytone receive output.
HiGH : Voice circuits.

Internal amplifier bias voltage. Requires an external capacitor. This voltage should not be used by external circuitry.

Connected to the negative side of the line diode bridge.

Switched through to the receive circuit output when MUTE (pin 7) is LOW. It should be decoupled using a capacitor
since it is biased with REF voltage.

Transmit input amplifier non-inverting input

2

Transmit voice circuit input. Requires a DC bias from REF (pin 8) through a resistor.

Transmit input amplifier inverting input

1

Negative feedback input. Amplifier gain and frequency response are controlled by the feedback network.

Transmit input amplifier output

O

The value of the resistor between this pin and either V
characteristics. See Electrical Characteristics.

Receive input amplifier inverting input

2

Negative feedback is applied from the amplifier output to control amplifier gain and frequency response.

Receive input amplifier inverting input

1

This pin is internally biased through a resistor using REF.

Receive input amplifier output

O

Receive circuit output

O

Connect to a low-impedance (approximately 15kΩ) receiver through a decoupling capacitor.

Supply voltage

CC

Supply voltage for internal circuitry. This supply should not be used as an external circuit supply except as the high­level voltage for the MUTE and PADC inputs.

(pin 1) when MUTE (pin 7) is LOW. It should be decoupled using a capacitor

L

CC

or ground determines the shape of the line-current vs. gain

No.3301–4/6

LA8515N

No.3301–5/6

LA8515N

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.

This catalog provides information as of January, 2001. Specifications and information herein are subject
to change without notice.

PS No.3301–6/6