Variable Split Band Inverter
6
MX214/224
MX214
Pin No.
J/P
LH
2
20
MX224
Pin No.
J/P
LH
20
20
Signal Name
Description
Highband Balanced
Modulator Input
3
21
21
21
Lowband Balanced
Modulator Input
4
22
22
22
Tx input
5
23
23
23
Lowband Filter
Output
6
10,
11,
12
24
24
24
4, 5, 6,
7, 9
V
DD
N/C
The input to the Balanced Modulator of the
Upperband limit. This input must be connected to
the Highband Filter Output via capacitor C5. See
Figure 2 and Figure 3.
The input to the Balanced Modulator of the
Lowerband limit. This input must be connected to
the Lowband Filter Output via capacitor C6. See
Figure 2 and Figure 3.
This analog ‘Clear’ audio input for the VSB
Scrambler. This pin is held at a DC ‘bias’ voltage by
a 300k on-chip bias resistor, which is selected for
all functions except powersave. In must be
connected to external circuitry by capacitor C4. See
Figure 2 and Figure 3. This input, in Tx mode, is
connected to Upper and Lowerband input filters.
Signal paths and bias levels are detailed in Table 2
and Figure 6.
The output of the Input filter of the lowerband limit.
The Rx / Tx function determines which filter is used
(Filter 1 or 2). See Figure 6 and Figure 7. This
output must be connected to the Lowband balanced
modulator input via capacitor C6. See Figure 7.
A single 5.0V supply is required.
No Connection
Table 1: Signal List
Rx/ Tx = 1
Rx Path
Rx Out Level
Tx Path
Tx Out Level
Enabled
Bias
Disabled
Bias
Rx/ Tx = 0
Disabled
Bias
Enabled
Bias
MUTE = 0
Disabled
Bias
Disabled
Bias
POWERSAVE
Disabled
High Impedance
Disabled
High impedance
Table 2: Functions Influencing Signal Paths
1998
MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480112.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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