CMX264D5 View Datasheet(PDF) - CML Microcircuits
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Description
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CMX264D5 Datasheet PDF : 25 Pages
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Frequency Domain Split Band Scrambler
1.5.3.4 Output Select (D8, D7, D6)
CMX264
D10 D9
0
0
1
D8 D7 D6
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
D5 D4 D3 D2
Pre/De-Emphasis
Select/Bypass
Pre/De-Emphasis
Blocks all Powersaved
and Bypassed
X
X
X
X
D1 D0
Split Point
Select
Scrambler
Bypassed
XX
MICO
Bias
Active
Bias
Active
RECO
Bias
Active
Bias
Active
Bias
Active
Bias
Active
EXTO
Bias
Active
Bias
Active
Bias
Active
Bias
Active
Bias
Active
Bias
Active
Bias
Active
Bias
Active
Table 5
Bits D8, D7, D6 activate or de-activate the audio outputs in both clear (D9 = 1) and scramble
(D9 = 0) modes:
Bit D8 controls the Tx output MICO.
Bit D7 controls the Rx output RECO.
Bit D6 controls the Rx output EXTO.
In all cases, the output is activated by setting the relevant data bit to logic 1 and is de-activated
by setting the bit to logic 0. The Rx outputs (RECO and EXTO) can also be de-activated by the
MUTERX pin, which asynchronously overrides bits D6 and D7.
When activated, the signal output at an output pin is determined by the internal state of the device,
e.g. in clear mode (D9 = 1), the MICO pin will output the signal from the MICIN pin. In scramble mode,
when the Tx de-emphasis circuit is selected, the MICO pin will carry the signal from the de-emphasis
output, and so on.
When de-activated, an output is pulled to VBIAS by means of an internal high impedance.
1.5.3.5 Pre/De-Emphasis Select (D5, D4, D3, D2)
D10
0
D9
D8
D7
D6
D5 D4 D3 D2 D1 D0
0
MICO
RECO
EXTO
Output Control Output Control Output Control
Pre/De-Emphasis
Select/Bypass
(See Text)
Split Point
Select
Table 6
Bits D5, D4, D3, D2 have an effect in scramble mode only and are used to select or bypass the pre-
emphasis and de-emphasis blocks.
© 1999 Consumer Microcircuits Limited
11
D/CMX264/1
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