User Manual

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USERS MANUAL
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4/198 17-LXE 108 566 Uen PA6
2.3.3 Logic Levels
Many of the signals present in the interface are CMOS signals where the following
levels apply. The nominal voltage level for the CMOS signals is 2.9 V.
Limits
Parameters
Test
Conditions
Min Max
Units
High level output voltage (I
OH
= 800 µA) V
OH
2.45 3.1 Volts
Low level output voltage (I
O
L
= 800 µA) V
O
L
0 0.45 Volts
High level input voltage (V
I
H
= 800 µA) V
I
H
1.9 3.1 Volts
Low level input voltage (V
IL
= 800 µA) V
IL
0 0.9 Volts
Table 3: CMOS Output / Input Electrical Characteristics
2.4 Power Supply
The CM52 requires a dual DC power supply implementation in the application.
VCC_MAIN provides power to the entire radio while VCC_AUX provides power for the
3-Watt functionality and biasing for the RF switches. VCC_AUX must be present if the
3W option is provided even if it is not used
. If the 3W circuitry is not populated then
VCC_AUX is not required.
The following table summarizes the power supply requirements from the application.
Max. Current (Amps) Max. Ripple (mVpp)
Input Supply Voltage
(Volts DC)
Operation 0- 4KHz 4 KHz-10MHz
VCC_MAIN
5.00 ± 10% 1.0 100mVpp 50mVpp
VCC_AUX
13.8 ± 20% 1.3 600mVpp 240mVpp
VRTC(no GPS)
1.8 to 3.9
1.2 µ
VRTC(with GPS)
3.4 to 3.9
500 µ
Table 4: CM52 Power Supply Requirements
2.4.1 Power Supply and Ground Signals
2.4.1.1 Power Supply Signal Pins
Following is a list of the power supply pins: