GMSK Modem
CMX589A
6.1.3 Operating Characteristics
For the following conditions unless otherwise specified.
VDD = 5.0V @ TAMB = 25°C
Xtal/Clock Frequency = 4.096MHz, Data Rate = 8kbps, Noise Bandwidth = Bit Rate
Static Values
Supply Current
Tx PS Rx PS
IDD (VDD = 3.0V)
1
1
0
1
1
0
0
0
IDD (VDD = 5.0V)
1
1
0
1
1
0
0
0
Input Logic Level
Logic 1 Input Level
Logic 0 Input Level
Logic Input Current
Output Logic Level
Logic 1 Output Level (IOH = 120µA)
Logic 0 Output Level (IOL = -120µA)
Transmit Parameters
Tx OUT pin DC bias shift caused by change from
Tx Enable = 0 to Tx Enable = 1 while
Tx PSAVE = 0 at 25°C
Tx OUT, Output Impedance
Tx Out, Level
Output DC Offset
Tx Data Delay
BT = 0.3
BT = 0.5
Tx PS to Output-Stable time
Receive Parameters
Rx Amplifier
Input Impedance
Output Impedance
Voltage Gain
Rx Filter Signal Input Level
Rx Time Delay
Notes
1
2
3
4, 10
12
5
5
6
7
8, 10
9
Min.
-
-
-
-
-
-
-
-
3.5
-
-5.0
4.6
-
-
-85.0
-
0.8
-0.125
-
-
-
1.0
-
-
0.7
-
Typ.
0.5
1.0
1.0
1.5
1.0
2.0
3.0
4.0
-
-
-
-
-
-
1.0
1.0
-
2.0
1.5
4.0
-
10.0
50.0
1.0
-
Max.
-
-
-
-
-
-
-
-
-
1.5
5.0
-
0.4
85.0
-
1.2
0.125
2.5
2.0
-
-
-
-
1.3
3.0
Units
mA
mA
mA
mA
mA
mA
mA
mA
V
V
µA
V
V
mV
kΩ
VP-P
V
bit-
periods
bit-
periods
bit-
periods
MΩ
KΩ
dB
VP-P
bit-
© 1998 Consumer Microcircuits Limited
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D/589A/3