CMX264 データシートの表示（PDF） - MX-COM Inc
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CMX264 Datasheet PDF : 22 Pages
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Frequency Domain Split-Band Scrambler
5
2 Signal List
CMX264 Advance Information
Packages
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Signal
Name
Type
N/C
N/C
XTAL
input
XTAL
output
N/C
MICO
output
N/C
VBIAS
N/C
N/C
MICIN
output
input
VSS
N/C
RXIN
power
input
N/C
MUTERX
input
EXTO
output
N/C
RECO
output
Description
This pin should be left unconnected.
This pin should be left unconnected.
A 4.433619MHz crystal is connected to these pins with the
appropriate external components (see Figure 2).
Alternatively, an externally derived clock signal may be applied to
the XTAL pin. In this case, the XTAL pin should be left
unconnected.
This pin should be left unconnected.
The Tx audio output from the scrambler. This signal may be
scrambled or clear. If scrambled it may come from the variable
split-band (VSB) scrambler direct or via the Tx de-emphasis block.
All signal paths depend upon the internal state selected.
This pin should be left unconnected.
A bias line for the internal circuitry, internally held at VDD/2. This
pin must be decoupled to VSS by a capacitor mounted close to the
device pins.
This pin should be left unconnected.
This pin should be left unconnected.
The input for the signal from the microphone amplifier/limiter. This
pin may be the input to the Tx pre-emphasis circuit, the VSB
scrambler or the clear path, depending upon the internal state
selected.
The negative supply rail (ground)
This pin should be left unconnected.
The input for the received audio signal, whether scrambled or
clear. This pin may be routed to the Rx pre-emphasis circuit, the
flatband frequency descrambler or the clear path, according to the
internal state selected via the serial interface.
This pin should be left unconnected.
A logic input which when high (VDD) immediately de-activates the
two Rx outputs (RECO and EXTO), overriding the serial data
previously loaded. When this input is low (VSS), the Rx outputs are
controlled by the serial data port.
One of two Rx outputs. This is used for routing the recovered
audio to external devices, e.g. a speakerphone. This output may
be independently activated or de-activated by selecting the
appropriate internal state. When de-activated, either by the serial
data or by the MUTERX pin, the output is set to VBIAS.
This pin should be left unconnected.
The other Rx output. This is used for routing the recovered audio
to the telephone loudspeaker. This output may be independently
activated or de-activated by selecting the appropriate internal
state. When de-activated, either by the serial data or by the
MUTERX pin, the output is set to VBIAS.
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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