CMX138 CML Microcircuits, CMX138 Datasheet - Page 68

• Manufacturer Part Number: CMX138
• Description: Audio Scrambler and Sub-Audio Signalling Processor
• Manufacturer: CML Microcircuits

Audio Scrambler and Sub-Audio Signalling Processor
© 2008 CML Microsystems Plc
Notes:
AC Parameters (cont.)
Audio Compandor
CTCSS Encoder
In-band Tone Encoder
DCS Encoder
Attack time
Decay time
0dB point
Compression / Expansion ratio
Frequency Range
Tone Frequency Accuracy
Tone Amplitude Tolerance
Total Harmonic Distortion
Frequency Range
Tone Frequency Accuracy
Tone Amplitude Tolerance
Total Harmonic Distortion
Bit Rate
Amplitude Tolerance
81
82
83
84
AV
Measured at MOD output.
AV
AV
DD
DD
DD
= 3.3V and Tx Sub-Audio Level set to 88mV p-p (31mV rms).
= 3.3V and Tx Audio Level set to 871mV p-p (308mV rms).
= 3.3V.
Page 68
Notes
81
82
83
82
81
84
Min.
60.0
−1.0
−1.0
−1.0
288
–
–
–
–
–
–
–
–
–
134.4
Typ.
100
4.0
2:1
2.0
2.0
13
–
–
–
0
–
0
0
Max.
3000
±0.3
+1.0
±0.3
+1.0
+1.0
260
4.0
4.0
–
–
–
–
–
D/138_FI1.0/5
mVrms
CMX138
Unit
bps
ms
ms
Hz
dB
Hz
dB
dB
%
%
%
%