CTCSS Encoder
4
MX315A
2. Signal List
Pins
J,P
1
2
3
4
5
6
7
8
DW
1
2
3
4
5
6
7
8
Signal
Name
D3
D2
D1
D0
D4
D5
V
SS
Xtal/Clock In
Type
input
input
input
input
input
input
power
input
Negative Supply Voltage.
This is the input to the CMOS inverter. It can be used in
conjunction with the Xtal output to form the active element in a
crystal oscillator circuit. Alternatively, a logic level 1MHz
frequency can be injected at this pin. However, the supply
voltage should never be applied without the input clock signal.
This is the output of the CMOS inverter. When used as a
crystal oscillator, track lengths and loading of this pin should be
minimized.
Do not use
No Connection
No Connection
output
This is the tone output pin. It includes a low impedance emitter
follower stage for sourcing sinusoidal tone. The tone is
generated about a DC level of approximately V
DD
/2. The pin is
high impedance when not encoding.
This logic input has an internal pull-up resistor. A logic “0” at
this pin enables the MX315A.
This logic input has an internal pull-down resistor. A logic “1”
at this pin enables the MX315A.
Positive Supply Voltage.
Table 1: Signal List
D0-D5 are tone select inputs with internal pull-up resistors.
The logic combination at these inputs determines the encoded
CTCSS tone. See Table 1. The input sequence is not latched
and may be changed at any time. A logic “1” will be
programmed if the input is open circuit, allowing the use of
SPST switches.
Description
9
9
Xtal Output
output
10
10
11
12
Internal Connection
N/C
N/C
TX Tone Output
11
13
12
13
14
14
15
16
TX Enable Input
TX Enable Input
V
DD
input
input
power
1998 MXCOM, INC.
www.mxcom.com
tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480054.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All Trademarks and service marks are held by there respective companies.
CMLMICRO [ CML MICROCIRCUITS ]
