MX812
Features and Applications
• Serial Bus
µ
Processor Control
• On-Chip DRAM Controller
• Up To 2 Minutes of High-Quality
Recorded Audio
• Answering Functions and Voice-
Notepad
• Low-Power 5-Volt CMOS
DATABULLETIN
VSR CODEC WITH
DRAM CONTROL
PRELIMINARY INFORMATION
•
Half-Duplex Voice Storage and Retrieval
• Selectable Sample Rates and “Memory
Size”
MX812DW
28-pin SOIC
MX812J
28-pin CDIP
CLOCK
CLOCK
GENERATOR
WE
CAS
AUDIO OUT
DEMOD
RAS1
A10/R2
V
BIAS
AUDIO IN
E
BIAS
CVSD
CODEC
DRAM
MOD
CONTROL
A9
A8
A7
A6
A5
1 or 2 x
1Mbit
DRAM
Chips
EXTERNAL
DRAM
V
DD
POWER METER
V
SS
A4
A3
A2
STATUS REGISTER
A1
CHIP SELECT
SERIAL CLOCK
COMMAND DATA
REPLY DATA
IRQ
SERIAL
C-BUS
INTERFACE
and
LOGIC
STORE/PLAY/WAIT COMMAND BUFFER
or
1x
4Mbit
DRAM
Chip
A0
D
DGND
MODE REGISTER
Figure 1 - MX812 Voice Store and Retrieve Codec
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480076.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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