MX014P 데이터 시트보기 (PDF) - CML Microsystems Plc
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MX014P Datasheet PDF : 12 Pages
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Voice Band Inverter
4
2. Signal List
MX014
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Name
XTAL
XTAL
PTT
PTT
PTL
PTL
RXAUDEN
RXAUDEN
PRIVEN
RXOUT
TXOUT
VSS
BPFOUT
RXBIN
DEMPOUT
TXBIN
BIAS
FILTR
BALMOD
RXIN
RXFB
TXIN
TXFB
VDD
Description
An external 4MHz clock can be applied to this input. The clock circuit on chip has a resistor
and capacitors so that only one external crystal is required.
This is the inverted 4MHz clock output for use when a crystal oscillator is used, or as a buffer
for driving other clocked devices.
Push To Talk is an input with a 3MΩ pull-down resistor.
This is the inverted PTT output. It has a 100kΩ output impedance.
Push To Listen is an input with a 3MΩ pull-down resistor.
Push To Listen is the inverted output of PTL; it has a 100kΩ output impedance.
RX Audio Enable is an input with a 3MΩ pull-down resistor.
RX Audio Enable is the inverted output of RX Audio Enable; it has a 100kΩ output impedance.
Privacy Enable controls the input action of the balanced modulator by switching the carrier
clock. When audio signals are inverted, the signal path gain is adjusted automatically to
compensate for the upper sideband loss. It contains a 3MΩ pull-down resistor.
This is the receive audio output pin. It is biased at VDD/2 when in the TX mode.
This is the “send” voice output pin. It is biased at VDD/2 when in RX mode.
The negative supply pin (ground).
For a gain of one in the RX Output stage, these two pins are wire linked together. However,
if gain is introduced at the RX input, attenuation may be introduced at the RX Output using
these pins and two resistors.
The pre-emphasis circuit has a 10dB gain at 1 kHz. Additional gain, or attenuation can
be introduced as in the RX path.
This is the internally generated VDD/2 decoupling pin.
This filter is the output of the Input Audio BPF and must be a.c. coupled into the Balanced
Modulator Input through a 0.1µF capacitor.
This is the input to the balanced modulator. It must be a.c. coupled to the Filter Output.
This is a negative input of an op-amp at the input of the RX path. It can be used, along with
RX Audio Feedback and two external resistors, to increase the signal to its optimum level prior
to frequency inversion/filtering. This may improve the S/N.
RX Audio Feedback is the output of an op-amp at the input of the RX path. See RXIN.
The negative input of an op-amp at the input of the TX path. It can be used, along with TX
Audio Feedback and two external resistors, to increase the signal to its optimum level prior to
frequency inversion/filtering. This may improve S/N.
TX Audio Feedback is the output of an op-amp at the input of the TX path. See TXIN.
The positive supply pin.
Table 1: Signal List
© 1997 MX•COM, INC.
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