LA2806M Datasheet, PDF (5/11 Pages) Sanyo Semicon Device – Signal Processor and Power Amplifier IC for Telephone Answering Machines

LA2806M
Mode Selection
Mode
MUTE
ICM REC
2WAY REC
DICT REC
2WAY BEEP
ICM OUT
ICM PLAY
OGM REC
OGM CHANGE
OGM OUT
OGM PLAY
ROOM MONI
ROOM OUT
VOICE SELE
Conversation
recording
REC LINE PWR
ON/ ON/ ON/
OFF OFF OFF
INPUT
D1 D0
MUTE
SW1/
SW11
ICM
REC
SW2
ICM
PLAY
×
×
×
×
× HIGH ×
×
HIGH LOW HIGH HIGH HIGH LOW 1
0
HIGH LOW LOW HIGH HIGH LOW 1
0
HIGH LOW LOW HIGH LOW LOW 1
0
HIGH HIGH HIGH LOW HIGH LOW 1
0
LOW HIGH HIGH LOW LOW LOW 0
1
LOW LOW HIGH LOW LOW LOW 0
1
LOW LOW LOW HIGH LOW LOW 0
0
LOW LOW HIGH HIGH HIGH LOW 0
0
LOW HIGH HIGH LOW HIGH LOW 0
0
LOW LOW HIGH LOW HIGH LOW 0
0
LOW HIGH LOW HIGH LOW LOW 0
0
LOW LOW HIGH HIGH HIGH LOW 0
0
LOW HIGH HIGH HIGH HIGH LOW 0
0
SW3
LINE
×
1
1
0
1
0
0
0
1
1
1
0
1
1
SW4
MIC
SW5
MUTE
SW6 SW7
PRE/ MONI
OGM /OGM
×
0
×
×
0
1
1
1
0
1
1
1
1
1
1
1
0
1
0
1
0
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
0
1
0
1
0
1
0
1
1
1
1
1
0
1
1
1
0
1
1
0
SW8
LINE
×
0
0
0
1
1
0
0
0
1
0
1
0
1
SW9
PWR
SW10
PRE/
EQ
×
×
1
0
0
0
0
0
1
0
1
1
1
1
0
0
1
0
1
0
1
0
0
0
1
0
1
0
HIGH HIGH HIGH HIGH HIGH LOW 1
0
1
0
1
1
0
1
1
0
Notes
2WAY BEEP : LINE OUT –6 dB
1 = ON and 0 = OFF (SW1 to SW5, SW8, SW9 and SW11)
Pin Functions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Pin name
BIAS/GAIN
ICM
PB NF
GND
LINE
MIC
PRE NF
PRE OUT
ALC. CT
SIG IN
OGM/BEEP
FIL NF
FIL OUT
V. REF
V_CC
P.GND
PWR OUT
P.V_CC
D.C
PWR IN
PWR MONI
LINE OUT
TH
VOX. C/MUTE
VOX
D0
D1
PWR ON/OFF
LINE ON/OFF
REC ON/OFF
Functions
Bias. Recording amplifier gain and recording bias current controled by external
resistor.
Incoming head input/output
Playback amplifier feedback. Receives negative feedback input from PRE OUT
(pin 8).
Preamplifier ground
Line input
Microphone input
Preamplifier feedback. Receives negative feedback input from PRE OUT (pin 8).
Preamplifier/playback amplifier output
Automatic level control time constant adjust input
Preamplifier/playback amplifier output signal input
Outgoing message/beep input
Filter amplifier negative feedback input
Filter amplifier output
Internal reference voltage output (Approx. 2.2 V)
Preamplifier supply
Power amplifier ground
Power amplifier output
Power amplifier supply
Power amplifier reference voltage output (Approx. 4/9 x P.V_CC)
Power amplifier input
Power amplifier monitor output
Line amplifier output
Voice-operated switch (VOX) threshold adjust input. VOX sensitivity can be adjusted
by connecting this signal to the V_REF pin (pin 14) via a resistor.
Voice-operated switch (VOX) detection and mute control
Voice-operated switch (VOX) open-collector output
Incoming message, line, microphone and outgoing message/beep analog switch
control inputs.
Power amplifier ON/OFF analog switch control input
Line amplifier ON/OFF analog switch control input
Recording amplifier ON/OFF analog switch control input
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