DVSR CODEC
21
MX802
Static Values
Notes
Min.
Typ.
Max.
Units
Encoder/Decoder (Full Codec)
Passband
10, 11
11
300
3400
Hz
dB
Passband Gain
0
Passband Ripple
11
-3.0
6.0
3.0
10
dB
Stopband
kHz
dB
Stopband Attenuation
SINAD Level
50.0
23.0
-50
dB
Output Noise (Input Short Circuit)
Idle Channel Noise (Forced)
Xtal/Clock Frequency
dBp
dBp
MHz
-55
6
4.0
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. CAS, WE, and A0 to A9 inputs.
4. When the IRQ output is at V
.
DD
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
100ꢂ.
6.1.4 Timing
C-BUS Timing
Min.
b
Typ. Max. Units
a
c
t
t
t
t
t
t
Chip Select Low to First Serial Clock Rising Edge
2.0
4.0
4.0
4.0
8.0
8.0
ꢃs
ꢃs
ꢃs
ꢃs
ꢃs
ꢃs
CSE
CHS
HIZ
Last Serial Clock Rising Edge to Chip Select High
Chip Select High to Reply Data High – Z
Chip Select High
2.0
2.0
4.0
2.0
4.0
8.0
4.0
8.0
16.0
8.0
CSOFF
NXT
CK
Command Data Inter-Byte Time
Serial Clock Period
Direct Address Timing
t
t
t
t
t
t
Decoder or Encoder Clock High
1.0
1.0
ꢃs
ꢃs
ꢃs
ꢃs
ꢃs
CH
CL
SU
H
Decoder or Encoder Clock Low
Decoder Data Set Up Time
0.45
0.60
Decoder Data Hold Time
Encoder Clock High to Encoder Data Valid
0.75
PCO
+ t = Data True Time
SU
H
Table 12: Timing Information
ꢀ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
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