GENERAL DESCRIPTION

The MSM6789A/6789L, an improved version of MSM6788, is a solid-state recorder developed using the Sub Band Coding (SBC) method.

Just like MSM6788, the MSM6789A/6789L has a stand-alone mode and a microcontroller interface mode. In the stand-alone mode, record/playback conditions can be selected from pins and the MSM6789A/6789L can be controlled by a simple drive timing. In the microcontroller interface mode, record/playback can be controlled by commands from the microcontroller, and more functions are available than in the stand-alone mode.

FEATURES

? SBC method

? Built-in 12-bit AD converter

? Built-in 12-bit DA converter

? Built-in microphone amplifier

? Built-in low-pass filter

Attenuation characteristics –40 dB/oct

? External memories

MSM6789A (5 V version)

General-purpose DRAM, 32 Mbits maximum (for variable messages)

1-Mbit DRAM : Can be directly driven (MSM514256B, MSM511000B)

4-Mbit DRAM : Can be directly driven (MSM514400C, MSM514100C)

16-Mbit DRAM: Can be directly driven (MSM5117400A, MSM5116100A)

ARAM, 32 Mbits maximum (for variable messages)

Note :Use the first 64 Kbits with no failed bits for the ARAM.

Serial register, 32 Mbits maximum (for variable messages)

4-Mbit serial register : Can be directly driven (MSM6684B)

8-Mbit serial register : Can be directly driven (MSM6685)

MSM6789L (3.3 V version)

Serial register, 16 Mbits maximum (for variable messages)

4-Mbit serial resister: Can be directly driven (MSM66V84B)

MSM6789A (5 V version) and MSM6789L (3.3 V version)

Serial voice ROM, 4 Mbits maximum (for fixed messages)

1-Mbit serial voice ROM : Can be directly driven (MSM6595A)

2-Mbit serial voice ROM : Can be directly driven (MSM6596A)

3-Mbit serial voice ROM : Can be directly driven (MSM6597A)

? Bit rate

10.0, 12.6, 16.0 kbps (at 8 kHz sampling freq.)

7.5, 9.5, 12.0 kbps (at 6 kHz sampling freq.)

? Maximum recording time (when one 8-Mbit serial register is connected)

13.8 minutes (for 10.0 kbps SBC) 18.4 minutes (for 7.5 kbps SBC)

11.0 minutes (for 12.6 kbps SBC) 14.6 minutes (for 9.5 kbps SBC)

8.6 minutes (for 16.0 kbps SBC) 11.5 minutes (for 12.0 kbps SBC)

? Number of phrases

63 phrases for variable messages

63 phrases for fixed messages

? Standard linear PCM playback or OKI nonlinear PCM playback can be selected.

? Voice triggered starting function (voice detect level can be set)

? Unvoiced-part elimination function (voice detect level can be set)

? Pausing function

? Master clock frequency: 6.0 MHz to 8.192 MHz

? Power supply voltage:

MSM6789A : Single 5 V power supply

MSM6789L : Single 3.3 V power supply

? Package options:

MSM6789A : 100-pin plastic QFP (QFP100-P-1420-BK) (Product name: MSM6789AGS-BK)

MSM6789L : 100-pin plastic QFP (QFP100-P-1420-BK) (Product name: MSM6789LGS-BK)