CMX469A 查看數據表（PDF） - CML Microsystems Plc
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CMX469A Datasheet PDF : 16 Pages
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1200/2400/4800 Baud FFSK/MSK Modem
CMX469A
Operating Limits
Correct operation of the device outside these limits is not implied.
Supply (VDD - VSS)
Operating Temperature
Xtal Frequency
Notes
1
Min.
2.7
-40
4.028
Max.
5.5
+85
4.036
Units
V
°C
MHz
Note 1: A Xtal frequency of 1.008MHz (1200/2400 baud only) or 4.032MHz is required for correct
operation. A frequency tolerance of ±0.1% is recommended, but ultimately the tolerance selected will
depend upon system requirements.
Operating Characteristics
For the following conditions unless otherwise specified:
VDD = 2.7V at Tamb = 25°C and VDD = 3.0V to 5.5V at Tamb = −40°C to +85°C,
Xtal/Clock Frequency = 4.032MHz, Bit Rate = 1200 baud, Rx Input Level = 300mVrms.
Static Values
IDD Rx Enabled, Tx Disabled
IDD Rx and Tx Enabled
IDD Rx and Tx Disabled
(VDD = 5.0V)
(VDD = 5.0V)
(VDD = 5.0V)
IDD Rx Enabled, Tx Disabled (VDD = 3.0V)
IDD Rx and Tx Enabled
(VDD = 3.0V)
IDD Rx and Tx Disabled
(VDD = 3.0V)
Logic ‘1’ Level
Logic ‘0’ Level
Digital Output Impedance
Analogue and Digital Input Impedance
Tx Output Impedance (VDD = 5.0V)
Dynamic Values
Receiver
Signal Input Dynamic Range SNR = 50dB
Bit Error Rate at SNR = 12dB
1200 Baud
2400 Baud
4800 Baud
Bit Error Rate at SNR = 20dB
1200/2400/4800 Baud
Receiver Synchronization at SNR = 12dB
probability of bit 16 being correct
Notes
2
2
2
2
2
2
1
1
Min.
-
-
-
-
-
-
70%
-
-
100
-
Typ.
3.6
4.5
650
1.5
2.0
300
-
-
4.0
-
0.6
Max.
-
-
-
-
-
-
-
30%
-
-
1.0
3, 4
100
230 1000
4, 5
-
2.5
-
-
1.5
-
-
1.5 -
4, 5
-
<1.0
-
7
-
0.995
-
Units
mA
mA
µA
mA
mA
µA
VDD
VDD
kΩ
kΩ
kΩ
mVrms
10-4
10-3
10-3
10-8
© 2001 Consumer Microcircuits Limited
11
D/469A/2
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