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CMX264D5 View Datasheet(PDF) - MX-COM Inc

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CMX264D5 Datasheet PDF : 22 Pages
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Frequency Domain Split-Band Scrambler
10
CMX264 Advance Information
D9 = 0 selects scramble mode, i.e. the scrambler and descrambler blocks in the Tx and Rx channels are
selected.
In this mode, the split point is controlled by bits D1, D0. The four Pre-De-Emphasis blocks are independently
selectable by means of bits D5, D4, D3, D2.
4.3.4 Output Select (D8, D7, D6)
D10 D9 D8 D7 D6 D5 D4 D3 D2
0 0000
Pre/De-Emphasis
001
Select/Bypass
010
011
100
101
110
111
1000
Pre/De-Emphasis
0 0 1 Blocks all Powersaved
010
and Bypassed
011X XX X
100
101
110
111
D1 D0
Split Point
Select
Scrambler
Bypassed
XX
MICO RECO EXTO
Bias Bias
Bias
Active
Active Bias
Active
Bias Bias
Active
Active
Active Bias
Active
Bias Bias
Bias
Active
Active Bias
Active
Bias Bias
Active
Active
Active Bias
Active
Table 7: Output Select
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.
2000 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480210.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
 

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