PvtSQUELCHTM CTCSS Encoder/Decoder
10
MX375
Operating Limits
Correct operation of the device outside these limits is not implied.
Notes Min.
Typ.
Max.
Units
Supply (V -V
)
4.5
-40
5.0
5.5
V
DD SS
Operating Temperature
Xtal/Clock Frequency
85
°C
4.0
MHz
Table 7: Operating Limits
Operating Characteristics
For the following conditions unless otherwise specified:
= 5.0V, T = 25°C, XTAL = 4.0MHz, Audio level )dB ref. = 300mV , Composite input signal = 0dB,
RMS
V
DD
AMB
1 kHz tone in, -12dB (6kHz band limited) Gaussian white noise with a -20dB CTCSS tone.
Notes
Min.
Typ.
Max
Units
Static Values
Supply Voltage
4.5
5.0
5.5
V
Supply Current
TX (Private)
15.0
12.0
7.0
mA
mA
mA
MΩ
kΩ
MΩ
V
TX (Operating)
RX (Operating)
Analog Input Impedance
Analog Output Impedance
Tone Input Impedance
Input Logic “1”
0.5
0.5
0.5
3.5
4.0
Input Logic “0”
1.5
1.0
V
Output Logic “1” (I=-0.1mA)
Output Logic “0” (I=-0.1mA)
Dynamic Values
Decoder
V
V
Input Signal Level
Response Time
1,4
1,4,6
1,4,6
4
-20
dB
ms
ms
%f0
250
250
±3.0
Deresponse Time
Selectivity
±0.5
Encoder
Tone Output Level (775mV
ref.)
-3.0
-0.3
0
3.0
dB
RMS
Tone Frequency Accuracy
Tone Harmonic Distortion
Tone Output Load Current
0.3
5.0
5.0
1.0
%f0
%
2.0
2
9
mA
dB
Output Level Variation between Tones
Risetime (to 90% nominal level)
(f0>100 Hz)
-1.0
5
5
15
45
ms
ms
(f0<100 Hz)
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480026.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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