DVSR CODEC
21
MX802
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480033.008
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
Static Values
Notes
Min.
Typ.
Max.
Units
Encoder/Decoder (Full Codec)
Passband
10, 11
300
3400
Hz
Passband Gain
11
0
dB
Passband Ripple
11
-3.0
3.0
dB
Stopband
6.0
10
kHz
Stopband Attenuation
50.0
dB
SINAD Level
23.0
dB
Output Noise (Input Short Circuit)
-50
dBp
Idle Channel Noise (Forced)
-55
dBp
Xtal/Clock Frequency
6
4.0
MHz
Table 11: Operating Characteristics
Operating Characteristics Notes:
1.
Does not include current drawn by any attached DRAM.
2.
Serial Clock, Command Data, Chip Select, A1/DE1, and A2/DCK inputs
3.
,
WE
,
CAS
and A0 to A9 inputs.
4.
When the IRQ output is at VDD.
5.
The optimum range levels for a good Signal to Noise ratio.
6.
Audio frequency response will vary with respect to Xtal/Clock frequency.
7.
Reply Data output.
8.
IRQ output.
9.
RAS output.
10. Passband is reduced to (typically) 2700Hz when a sample rate of 25kbps or 50kbps is used.
11. Measured with a –20dB input level to avoid a codec slope-overload.
12. For optimum noise performance this input should be driven from a source impedance of less that
100
.
6.1.4
Timing
C-BUS Timing
Min.
Typ.
Max.
Units
ab
c
tCSE
Chip Select Low to First Serial Clock Rising Edge
2.0
4.0
8.0
s
tCHS
Last Serial Clock Rising Edge to Chip Select High
4.0
4.0
8.0
s
tHIZ
Chip Select High to Reply Data High – Z
2.0
s
tCSOFF
Chip Select High
2.0
4.0
8.0
s
tNXT
Command Data Inter-Byte Time
4.0
8.0
16.0
s
tCK
Serial Clock Period
2.0
4.0
8.0
s
Direct Address Timing
tCH
Decoder or Encoder Clock High
1.0
s
tCL
Decoder or Encoder Clock Low
1.0
s
tSU
Decoder Data Set Up Time
0.45
s
tH
Decoder Data Hold Time
0.60
s
tPCO
Encoder Clock High to Encoder Data Valid
0.75
s
tSU + tH = Data True Time
Table 12: Timing Information
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