APLUS
VERSATILE 10 SEC INSTANT
VOICE ROM
FEATURES
* Minimum 10 second voice length at 6 KHz
* Versatile features for playback
* Combination of voice building blocks
extends the duration of playback
* Voice data re-use saves memory space
* Four trigger pins,TG1 to TG4 for eight groups
* SBT for sequential play-all
# Holdable and unholdable, edge and level
triggering option
* 15 ms debounce time suitable for CDS
* IRP interrupt pin for master reset
* Three programmable output pins for STP Stop
Pulse, BUSY Signal, and LED
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API8108A
JUNE 1999
Built-in oscillator with variable sample rate
Single external resistor to determine sample rate
Built-in D/A converter, EPROM
ADPCM data compression provides high sound
quality
Optional pop noise elimination function
C
OUT
pin drives speaker with a transistor
V
1
and V
OUT
2
drives buzzer or speaker
OUT
directly
Auto-power down
3.0V-6V single power supply operation
Low standby current (<5
m
A at 3V)
Development tools support
GENERAL DESCRIPTION
API8108A is a high quality voice synthesizer capable of
varying playback duration. A proprietary ADPCM algorithm
is used. The audio message is stored in a 256K bits on-
chip EPROM which can store up to ten seconds of voice
data at 6 KHz sample rate.
The API8108A eliminates the need of complicated circuitry
in voice playback but still achieves high voice quality.
Sounds such as human speech, animal sounds, musical
sounds and even special sound effects can be synthesized.
Versatile combinations in sections achieve longer playback
duration. In addition, devices can be cascaded to achieve
longer voice duration. Two devices can be configured in
parallel in order to achieve signal mixing without an external
mixer in which speech can be mixed with background
music each from one of two different chips.
The API8108A provides wide operating voltage range
feom
2.8Vto6.0V.PWM
digital amplifier output pins,
V
OUT1
and V
OUT
2
provides direct drive to buzzer or speaker.
A current output pin, C
OUT
, enables the device to drive a
speaker through a low cost NPN transistor. No complex
filtering or amplifier circuit is needed. An automatic ramp-
down function eliminates undesired noise at the end of
playback.
Group of sections
The voice data memory area of the API8108A can be
subdivided into 124 sections. Any combination of these
sections will form an individual group for data playback. A
maximum of eight groups are available with activation
controlled by
TG1 to TG4
pins. The SBT pin can be used to
trigger multiple groups playback in sequence.
Group Configuration
Voice within each group are combinations of different fixed
memory sections of up to 124 sections. These sections are
the fundamental voice building blocks for arranging
playback without limiting sequencing. This provides
flexibility and allows data to be re-used, beneficial for
applications with many repeated sounds or words.
An example of group configuration is illustrated below:
Group No.
Group 1
Group 2
Group 3
Group 4
Section Entry
Sec 1 + Sec 2 + Sec 3 ----- Sec 109
.
Sec 3 + Sec 2
Sec 10 + Sec 11 + Sec 12
Sec110 + Sec 10 + Sec 5
1
APLUS [ APLUS INTERGRATED CIRCUITS ]
