Application Information ......
Suggested Evaluation Tests and Settings
COMPRESSION
CAPACITOR
PRE-PROCESS PATH
MIC. 1
10mVrms
710mVrms
DETECT
MIC. OUTPUT
0dB
0dB
PRE-PROCESS
AUDIO OUTPUT
710mVrms
20dB/dec.
158mVrms
300Hz
3000Hz
600mVrms
24dB
External
Gain
To
External
Audio Processes
14dB
158mVrms
Tx AUDIO INPUT
POST-PROCESS PATH
2.2V p-p (100%)
Output Level
Test
From
External Audio
Processes
dB
VCO
DRIVE (Tx)
755mVrms
2dB
20dB/dec.
2550Hz
3000Hz
0dB
0dB
0dB
600mVrms
∑
POST PROCESS
AUDIO INPUT
2.2V p-p (100%)
Output Level
dB
VCO REF
DRIVE (Tx)
0dB
CTCSS/DATA
Fig.8 Transmit Path – Suggested Test Settings
Active elements used in the signal path.
Powersaved or by-passed elements that are not
employed in the signal path.
PRE-PROCESS PATH
DETECT
11dB
-2.0dB
PRE-PROCESS
AUDIO OUTPUT
20dB/dec.
710mVrms
200mVrms
Rx AUDIO INPUT
300Hz
3000Hz
564mVrms
INPUT H.P.F.
0dB
Rx (Noise)
AUDIO
OUTPUT (Rx)
POST-PROCESS PATH
2.2V p-p
(100%)
dB
710mVrms
20dB/dec.
2550Hz
3000Hz
564mVrms
0dB
0dB
2dB
∑
dB
U
Rx (Noise)
# /
DAC
SQUELCH SYSTEM
SQUELCH
DRIVE
-
+
NOISE
INPUT
NOISE
OUTPUT
Fig.9 Receive and Squelch Paths – Suggested Test Settings
12
CMLMICRO [ CML MICROCIRCUITS ]
