SANYO LA2806M Datasheet

Ordering number: EN 3852D

Monolithic Linear IC

LA2806M

Signal Processor and Power Amplifier IC for

Telephone Answering Machines

Overview

The LA2806M is a one-chip voice signal processing IC for
single-mechanism answering machines that incorporates the
basic functions required for an answering machine as well as
the microcontroller interface and analog switches that are
needed in order to control those basic functions.

Functions

.

Recording preamplifier (with ALC : LINE/MIC input)

.

Playback equalizer amplifier

.

Recording amplifier (DC bias)

.

Analog switches

.

Voice-operated switch (VOX) with filter

.

Power amplifier (PO= 200 mW, RL=8Ω,VCC=5V)

.

Line output buffer

.

Microcontroller interface

Features

.

One-chip voice signal processing for single-mechanism
answering machines

.

Because the LA2806M incorporates all of the basic functions
required for an answering machine and can be controlled by
a microcontroller, this IC makes it possible to design an
original system

.

Built-in power amplifier

.

Allows conversation recording mode

.

Recording bias and amplifier gain control current can be set
separately using external resistors.

.

Small package (MFP30S)

Package Dimensions

unit : mm

3073A-MFP30S

[LA2806M]

SANYO : MFP30S

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

Allowable power dissipation Pd max 800 mW
Operating temperature Topr –20 to +70 °C
Storage temperature Tstg –40 to +150 °C

P.V

CC

CC

max,

max

9V

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O3097HA (II)/72495HA (ID)/3092HK/D111TS No.3852 - 1/11

LA2806M

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Recomended supply voltage V
Operating supply voltage range V
Recommended load resistance R
Preamplifier input voltage V

Operating Characteristics at Ta = 25°C, VCC=5V,f=1kHz

Parameter Symbol Conditions min typ max Unit
Quiescent current I
[Preamplifier]

Voltage gain VG

Total harmonic distortion THD
ALC turnover input voltage V
ALC output saturation voltage V

Equivalent input noise voltage V

ALC range ALC W
[Playback equalizer amplifier]
Voltage gain VG

Total harmonic distortion THD

Equivalent input noise voltage V
[Recording amplifier]
Voltage gain VG

Output bias voltage V
Total harmonic distortion THD –40 dBV preamplifier input 0.5 1.0 %

[LINE amplifier]: R
Voltage gain VG

Maximum output voltage V

=1kΩ

L

O

,P.V

CC

CC

op, P.VCCop 4.5 to 7.5 V

CC

L

IN

CC

–70 dBV input, measured between pins

C

5 and 8

Power amplifier 8 Ω

57 59 61 dB

–40 dBV input, measured between pins
5 and 8

Measured between pins 5 and 8 –68 –64 –60 dBV

ALC

–40 dBV input, measured between pins

OS

5 and 8
Input short circuited (internal 2.2 kΩ

NI

resistance)
From ALC ON to THD = 1 %

–70 dBV input, measured between pins

E

2 and 8

400 500 625 mVrms

40 45 dB

57 59 61 dB

–60 dBV input, measured between pins
2 and 8

Input short circuited (internal 2.2 kΩ

NI

resistance), Flat

50 kΩ impedance connected to pin 1

R

Z

, measured between pins 10 and 2

AC

100 kΩ resistance connected to pin 1

B

Z

, measured on pin 2

DC

Measured between pins 10 and 22 –1 0 +1 dB

L

–7.0 –4.0 –1.0 dB

0.4 0.8 1.2 V

5V

0 to 1.0 Vp-p

10 15 mA

0.5 1.0 %

1.5 5.0 µVrms

0.5 1.5 %

1.5 5.0 µVrms

Measured between pins 10 and 22,

max

THD = 1 % 0.6 Vrms

Total harmonic distortion THD –40 dBV preamplifier input 0.5 1.0 %
[Power amplifier]: R

Voltage gain VG

Output voltage P
Total harmonic distortion THD P

Input resistance r
Ripple rejection ratio SVRR Rg = 0, f
Output noise voltage V

=8kΩ, input pin 20

L

–30 dBV input, measured between pins

P

20 and 17
THD=10%

O

= 100 mW 0.5 1.0 %

O

i

Input short circuited, Flat 0.1 0.5 mVrms

NO

= 100 Hz, VCCr = –20 dBV 40 50 dB

r

26 28 30 dB

0.2 0.25 W

10 15 20 kΩ

[Voice-operated switch] Pin 25,R=20kΩapplied 5 V.
Sensitivity

V
V

–23 dBV input, f = 800 Hz 0.3 V

OXL

–27 dBV input, f = 800 Hz 4.5 5.0 V

OXH

Output ON voltage V sat 2 V supplied to pin24 0.3 V
[Control pin voltage]

1.5 (or

V

+ 0.3)

CC

1.5 V

CC

2.05 2.25 2.45 V

–0.7 V

Pin 26 to 30

Pin 24 (MUTE) V
[V

]

REF

Output voltage V

V

Input high-level voltage

H

V

Input low-level voltage 0 0.8 V

L

Input high-level voltage, supplied via

H

diode

REF

No. 3852 - 2/11

V

LA2806M

Pd max – Ta

Recommended mounting

Independent IC

Allowable power dissipation, Pd max – mW

Equivalent Block Diagram

Ambient temperature, Ta – °C

No. 3852 - 3/11

Test Circuit

LA2806M

Unit (resistance: Ω, capacitance: F)

No. 3852 - 4/11