VSR CODEC with DRAM CONTROL
10
MX812 PRELIMINARY INFORMATION
Performance
SINAD (dB)
35
Sample Rate = 63kb/s
30
25
20
15
Sample Rate = 32kb/s
10
5
0
-30
-27
-24
-21
-18
-15
-12
-9
-6
-3
0dB.
(308mVrms)
.
3
6
Input Level (dB)
Figure 9 - Typical “SINAD vs Input Level” Plot
Performance
Figure 9 Shows a typical graph of SINAD vs Input Level produced for both 32kbps and 63kbps sample rates
at an input frequency of 1.0kHz.
Figure 10 shows a typical graph of the “Power” reading for increasing input signal levels. The “Power” figure
(0 to 31) is the binary figure obtained from the 5-bit representation in the Status Register - Bits 0, 1, 2, 3 and 4
while the Codec is selected to the Encode mode.
This reading is updated at the end of every Store or Wait command; Excessive input signal levels will record
“111112” (3110).
1000
Input Level (mVrms)
Log Scale
100
10
Sample Rate
32kbps
'POWER' Reading
Sample Rate
Lin Scale
63kbps
1
0
10
20
30
Figure 10 - Typical “Power Reading vs Input Level” Plot
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480076.003
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CMLMICRO [ CML MICROCIRCUITS ]
