Baseband Processor For Mixed Mode Land Mobile Radio
CMX880
AC Parameters
Notes
Min.
Typ.
Max.
Units
CLOCK/XTAL Input
'High' pulse width
31
31
25
25
ns
ns
'Low' pulse width
Input impedance (at 15.36MHz)
Powered-up
Resistance
Capacitance
Resistance
Capacitance
150
20
300
20
kW
pF
kW
Powered-down
pF
Clock frequency
Clock stability/accuracy (mixed or digital)
(analogue only)
15.36
MHz
ppm
ppm
ms
32
33
±10
±100
Clock start up (from power-save)
400
30
V
BIAS
Start up time (from power-save)
ms
Microphone Inputs 1 and 2 and FM Disc Input
(MIC_1, MIC_2, FM_DISC)
Input impedance
34
35
1
MW
%VDD
kW
Input signal range
Feedback load resistance
10
80
90
Amplifier open loop voltage gain
(I/P = 1mV rms at 100Hz)
Unity gain bandwidth
ü
þ
60
1.0
dB
MHz
Notes:
31.
32.
Timing for an external input to the CLOCK/XTAL pin.
This is the clock accuracy required when using the CMX880 in C4FM digital or
mixed digital/analogue modes in order to meet the APCO 25 TSB102.CAAB, Digital
C4FM/CQPSK Transceiver Performance Recommendations.
33.
34.
35.
This clock accuracy is required when using the CMX880 in analogue only modes.
With no external components connected
After multiplying by gain of input circuit, with external components connected.
ã 2001 Consumer Microcircuits Limited
70
D/880/1
CMLMICRO [ CML MICROCIRCUITS ]
