¡ Semiconductor
¡ Semiconductor
MSM6789A/6789L
GENERAL DESCRIPTION
MSM6789A/6789L
SBC Solid-State Recorder IC
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.
The MSM6789A/6789L can directly drive serial voice ROM as external memory as well as serial
register or general-purpose DRAM* (1-bit
¥
or 4-bit
¥
type selectable) as external memories, which
allows a recording and playback circuit with fixed messages to be built easily. The method from
microcontroller is the same as the MSM6788.
* Only for MSM6789A
• Difference between MSM6788 and MSM6789A
MSM6788
MSM6789A
General DRAM
Unavailable
Available
Unvoiced-part elimination function No
Yes
PCM playback
No
Yes
• SBC method:
The SBC method divides voice frequencies into five bands and codes the component for each of
the bands separately, as shown below.
@f
s
=8.0 Hz
Gain
ch 1
ch 2
ch 3
ch 4
ch 5
3
kHz
0
1
2
f (Hz)
Note:
This data sheet explains a stand-alone mode and a microcontroller interface mode, separately.
MSM6789A/6789L
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• Difference between MSM6789A and MSM6789L
Parameter
Operating voltage
External memory
4.5 to 5.5 V
General-purpose DRAM, 32 Mbits (max.)
1-Mbit DRAM (MSM514256B, MSM511000B)
4-Mbit DRAM (MSM514400C, MSM514100C)
16-Mbit DRAM (MSM511740CA, MSM5116100A)
ARAM*, 32 Mbits (max.)
Serial register, 32 Mbits (max.)
4 Mbits (MSM6684B)
8 Mbits (MSM6685)
MSM6789A
MSM6789L
3.0 to 3.6 V
16 Mbits (max.)
4 Mbits (MSM66V84B)
*
Use ARAM which has no failed bits in its first 64 Kbits.
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MSM6789A/6789L
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)
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