LA2806M Datasheet, PDF (7/11 Pages) Sanyo Semicon Device – Signal Processor and Power Amplifier IC for Telephone Answering Machines

LA2806M
Sample Applications of Operating Modes
1) ICM REC (In coming message recording)
. _{Recording incoming messages.}
. _{Memo recording from a remote location (remote control).}
2) 2WAY REC (Two-way recording)
._{Simultaneously recording conversations.}
. _{Recording incoming messages.}
. 3) DICT REC (Dictaphone)
Recording messages using the microphone input (Recording short messages to your family, etc.).
. 4) 2WAY BEEP (Two-way beep)
The alarm sound is output on the speaker and is recorded as an incoming message. At the same time, it is output on the line
to the calling party.
. _{Indicates that the incoming message is being recorded.}
. _{The line output tone is 6 dB lower than the output level in other modes.}
5)
ICM OUT (Incoming message output)
. _{Playing back incoming messages locally.}
. _{Playing back incomming messages from a remote location.}
. _{Transferring incoming messages.}
. _{Playing back dictaphone recordings.}
6) ICM PLAY (Incoming message playback)
. _{Playing back incoming messages.}
. _{Playing back dictaphone messages.}
. 7) OGM REC (Outgoing message recording)
Recording outgoing messages. Messages can be transferred under microcomputer control to integrated memory devices.
. 8) OGM CHANGE (Remote outgoing message recording)
Re-recording outgoing messages from a remote location.
9) OGM OUT (Outgoing message output)
. _{Playing back outgoing messages locally.}
. _{Playing back outgoing messages from a remote location.}
. 10) OGM PLAY (Outgoing message playback)
Playing back and confirming outgoing messages.
. 11) ROOM MONI (Remote microphone monitoring)
Monitoring microphone input from a remote location.
. 12) ROOM OUT (Remote speaker output)
Output messages through the loudspeaker from a remote location.
. 13) VOICE SELE (Voice monitoring)
Sending output messages, and at the same time monitoring the caller’s voice through the loudspeaker.
. 14) Conversation REC (Conversation recording)
Simultaneously recording incoming messages and playing back the outgoing message.
IC Usage Notes
1) Printed Circuit Board
When designing a printed circuit board, the GND line connected to pin 4 should be thick and short. Common impedance may
lead to additional distortion.
2) Power Amplifier
Polyester film capacitors should be used as the oscillation prevention capacitor betweeen output pin 17 and GND, as they
have better temperature and frequency characteristics than electrolytic capacitors. Alminium electrolytic capacitors and
ceramic capacitors may cause oscillation at low temperatures.
3) Switching Noise
Switching noise can be eliminated by applying a LOW-level pulse greater than 10 ms to PWR ON/OFF pin 28 while the
preamplifier is being switched.
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