1200/2400bps MSK Modem for Trunked Radio Systems
16
MX429A
6.1.3 Operating Characteristics
For the following conditions unless otherwise specified:
V
DD
= 5.0V, T = 25ꢄC, Xtal/Clock f = 4.032MHz
AMB
0
Bit Rate Bandwidth = 1200Hz, Audio Level 0dB ref: = 300mV
RMS
Static Values
Notes Min.
Typ.
Max. Units
Supply Current Ranges
Rx and Tx Enabled
Rx Enabled, Tx Disabled
Rx Disabled, Tx Enabled
Rx and Tx Disabled
Dynamic Values
7.0
6.0
7.0
2.5
mA
mA
mA
mA
4.0
1.5
1.5
Modem Internal Delay
Interface Levels
ms
Output Logic '1' Source Current
Output Logic '0' Sink Current
Three State Output Leakage Current
D0 – D7 Data In/Out
Logic '1' Level
2
3
120
360
4.0
µA
µA
µA
1
3.5
V
V
Logic '0' Level
1.5
1.0
4
A1, A0, R/W, STROBE, IRQ
Logic '1' Level
4.0
V
V
Logic '0' Level
Analog Impedance's
Rx Input
100
kꢁ
kꢁ
Tx Output (Enabled)
Tx Output (Disabled)
On-Chip Xtal Oscillator
10
5.0
Mꢁ
R
10.0
5
Mꢁ
IN
R
OUT
30.0
kꢁ
dB
Oscillator Gain
25.0
Xtal frequency
4.032
MHz
Receiver
Signal Input Levels
6
7
–9.0
–2.0
10.5
dB
Bit Error Rate
@ 12dB Signal/Noise Ratio
@ 20dB Signal/Noise Ratio
Synchronization @ 12dB Signal/Noise Ratio
Probability of Bit 16 being correct
Carrier Detect Response Time
7.0
1.0
10–4
10–8
8
8
99.5
13.0
%
ms
© 1998 MX-COM Inc.
www.mxcom.com Tel: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480128.007
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