Frequency Domain Split Band Scrambler
CMX264
1.3
Signal List
Signal
Name
-
-
XTAL
XTALN
Type
-
-
I/P
O/P
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 XTALN 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 �½V
DD
. This pin must be decoupled to
V
SS
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.
Description
Package
D5
Pin No.
1
2
3
4
5
6
MICO
-
-
O/P
7
8
V
BIAS
-
-
O/P
9
10
11
MICIN
-
-
-
-
I/P
12
13
14
V
SS
-
RXIN
Power
-
I/P
©
1999
Consumer Microcircuits Limited
4
D/CMX264/1
CMLMICRO [ CML MICROCIRCUITS ]
