MSM6688 Schematic ( PDF Datasheet ) - OKI electronic componets

Teilenummer	MSM6688
Beschreibung	ADPCM Solid-State Recorder IC
Hersteller	OKI electronic componets
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Gesamt 70 Seiten 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 VDD ± 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 VDD to 3 4 VDD ± VDD , ± VDD , ± VDD 128 64 32 4M bits (max.) 4M bits (MSM66V84B) 1/159 ¡ Semiconductor MSM6688/6688L PIN DESCRIPTIONS Pin Symbol 49 DVDD 21 DVDD' 22 AVDD 30 DGND 29 AGND 23 SG 24 SGC 28 MIN 26 LIN 27 MOUT 25 LOUT 20 AMON 19 FIN 17 FOUT 16 ADIN 18 AOUT 39 SADX 38 SADY 36 SAS 37 TAS 50 RWCK 46 WE Type — — — — — Description Digital power supply pin. Insert a bypass capacitor of 0.1µF or more between this pin and the DGND pin. Digital power supply pin Analog power supply pin. Insert a bypass capacitor of 0.1µF or more between this pin and the AGND pin. Digital ground pin Analog ground pin O Output pin for analog circuit reference voltage (signal ground) Inverting input pin of the built-in OP amplifier. Non-inverting input I pin is internally connected to SG (signal ground). MOUT and LOUT are output pins of the built-in OP amplifier for MIN O and LIN, respectively. This pin is connected to the LOUT pin in the recording mode and to O the DA converter output in the playback mode. Used to connect the built-in LPF input (FIN pin). I Input pin of the built-in LPF. Output pin of the built-in LPF. Used to connect the AD converter O input (ADIN pin). I Input pin of the built-in 12-bit AD converter. Output pin of the built-in LPF. This pin outputs playback waveforms O and used to connect an external speaker drive amplifier. (Serial Address Data). SADX is used to connect the SAD pin of each external serial register and the SADX pin of each external serial voice O ROM. SADY is used to connect the SADY pin of each external serial voice ROM. Outputs of starting address of read/write. (Serial Address Strobe). Used to connect the SAS pin of external O serial register and the SASX and SASY pins of external serial voice ROM. Clock pin to write the serial address. (Transfer Address Strobe). Used to connect the TAS pin of each external serial register and serial voice ROM. O This pin outputs address strobe outputs to set the serial address data from the SADX and SADY pins into the internal address counter of each serial register and serial voice ROM. (Read/Write Clock). Used to connect the RWCK pin of each external serial register and the RDCK pin of each external O serial voice ROM. This pin outputs a clock to read data from or write it into each external serial register. (Write Enable) Used to connect the WE pin of each external O serial register. This pin outputs WE signal to select either read or write mode. 6/159 6 Page ¡ Semiconductor Analog Characteristics Parameter Symbol DA output relative error FIN admissible input voltage range FIN input impedance ADIN admissible input voltage range ADIN input impedance |VDAE| VFIN RFIN VADIN RADIN Op-amp open loop gain GOP Op-amp input impedance RINA Op-amp load resistance ROUTA AOUT load resistance RAOUT FOUT load resistance RFOUT Condition no load — — — — fIN=0-4kHz — — — — MSM6688/6688L DVDD=DVDD'=AVDD=4.5 to 5.5V DGND=AGND=0V Ta=–40 to +85°C Min. Typ. Max. Unit — — 10 mV 1 — VDD-1 V 1 — — MW 0 — VDD V 1 — — MW 40 — — dB 1 — — MW 200 — — kW 50 — — kW 50 — — kW 12/159 12 Page
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