Low Voltage CTCSS Encoder/Decoder
12
MX165C
Operating Characteristics
For the following conditions unless otherwise specified
V
DD
= 3.3V / 5.0V at T
= 25°C, V = 0V,
AMB SS
Xtal Frequency = 1.0 MHz, 100ppm max.
(Over the life of the Xtal the operating range may vary from 100ppm up to 1000ppm)
0dB ref. = 750mV (proportional to V ; see note 17)
RMS
DD
Composite Signal:
1kHz test tone = 300mV
, f0 CTCSS tone = 30 mV
RMS
, 75mV
RMS
Noise (band limited to 6kHz Gaussian)
RMS
Notes
Min.
Typ.
Max.
Units
Static Values
Supply voltage
Supply current
2.7
3.3/5.0
5.5
V
V
V
= 5.0V
= 3.3V
3.2
1.1
2.0
550
400
40
4.2
1.6
mA
mA
mA
kΩ
Ω
DD
DD
Rx Monitor
Analog input impedance
Analog output impedance
Digital Input impedance
Input logic 1
18
18
1,18
1
480
25
1000
kΩ
V
70%V
DD
Input logic 0
1
30%V
20%V
V
DD
DD
Output Logic 1 source = 0.1mA
Output Logic 0 sink = 0.1mA
Dynamic Values
2
80%V
V
DD
2
V
Speech filter
Total harmonic distortion
5,8,19
8,18
0.7
0.5
1.5
1.0
%
Output noise level
mV
RMS
(input ac short circuit, audio switch enabled)
Sinad
8,9
18
40
33
50
dB
dB
Hz
dB
dB
dB
dB
Spurious emissions
Cutoff frequency
- 48
1.8
0.5
300
1
Bandpass ripple
8
Stopband attenuation <250Hz
Passband gain 1kHz
TX/RX isolation
7,8,19
36
0
- 0.5
5
60
Encoder
Tone output level
12
-1.0
0
1.0
0.3
dB
Tone Frequency Accuracy (f error)
Risetime to 90% nominal output
- 0.3
%f
0
f >100Hz
4,10
4,10
19
15
45
75
120
2
ms
ms
%
0
f <100Hz
0
Total Harmonic Distortion
1.5
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480102.008
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
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