MSM6688 Datasheet, PDF (1/159 Pages) OKI electronic componets – ADPCM Solid-State Recorder IC

E2D0026-27-43
¡ Semiconductor
MSM6688/6688L
ADPCM Solid-State Recorder IC
This version: Jan. 1998
Previous version: May. 1997
GENERAL DESCRIPTION
The MSM6688/6688L is a “solid-state recorder” IC developed using the ADPCM method. By
externally connecting a microphone, a speaker, a speaker drive amplifier, and a dedicated register
to store ADPCM data, it can record and play back voice data in a manner similar to a tape recorder.
The MSM6688 supports 5 V operation and has a stand-alone mode and a microcontroller interface
mode.
The MSM6688L supports 3 V operation and controls recording/playback in microcontroller interface
mode.
In the stand-alone mode, recording/playback conditions can be selected by pins and the MSM6688/
6688L can be controlled by a simple drive timing. In the microcontroller interface mode, recording/
playback can be controlled by commands from the microcontroller. In the microcontroller interface
mode, the MSM6688/6688L is much more flexible than in the stand-alone mode.
In addition, the MSM6688/6688L can form easily a recording and playback circuit with fixed
messages by connecting serial registers and serial voice ROMs as external memories.
Note: Thisdatasheetexplainsastand-alonemodeandamicrocontrollerinterfacemode,separately.
Differences Between MSM6688 and MSM6688L
Parameter
Operating voltage
Control mode
Full scale of A/D and D/A
converters
Voice detection level for voice
triggered starting
External-only register
MSM6688
3.5 to 5.5 V
Standalone mode,
Microcontroller interface mode
0 to V_DD
± ^VDD , ± ^VDD , ± ^VDD
64 32 16
32M bits (max.)
4M bits (MSM6684B)
8M bits (MSM6685)
MSM6688L
2.7 to 3.6 V
Microcontroller interface
mode only
1
4
V_DD to
3
4
V_DD
± ^VDD , ± ^VDD , ± ^VDD
128 64 32
4M bits (max.)
4M bits (MSM66V84B)
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