MSM6688L

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: This data sheet explains a stand-alone mode and a microcontroller interface mode, 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 S...