Baseband Processor For Mixed Mode Land Mobile Radio
CMX880
AC Parameters
Notes
Min.
Typ.
Max.
Units
CLOCK_OUT Output
CLOCK/XTAL input to CLOCK_OUT timing:
(in high to out high)
36
36
37
37
15
15
32.5
32.5
ns
ns
ns
ns
(in low to out low)
'High' pulse width
'Low' pulse width
26
26
39
39
Modulator Outputs 1 and 2 and Audio Output
(MOD_1, MOD_2, AUDIO)
Power-up to output stable
38
50
0
100
0.5
1.6
µs
Modulator Attenuators
Attenuation (at 0dB)
- 0.5
- 1.6
dB
Cumulative Attenuation Error
(wrt attenuation at 0dB)
ü
þ
dB
W
kW
Output Impedance
39
39
600
500
ü Enabled
þ Disabled
Audio Attenuator
Attenuation (at 0dB)
Cumulative Attenuation Error
(wrt attenuation at 0dB)
- 0.2
- 0.6
0
0.2
0.6
dB
ü
þ
dB
W
kW
kW
Output Impedance
39
39
600
500
ü Enabled
þ Disabled
Feedback load resistance
80
Amplifier open loop voltage gain
(I/P = 1mV rms at 100Hz)
Unity gain bandwidth
ü
þ
60
1.0
dB
MHz
Notes:
36.
CLOCK/XTAL input driven by external source such as a temperature compensated
crystal oscillator (TCXO).
37.
38.
15.36MHz XTAL fitted.
Power-up refers to issuing a “C-BUS” command to turn on an output. These limits
apply only if V
is on and stable. At power supply switch-on, the default state is
BIAS
for all blocks, except the XTAL and “C-BUS” interface, to be in placed in power-
save mode.
39.
Small signal impedance, at VDD = 5.0V and Tamb = 25°C.
ã 2001 Consumer Microcircuits Limited
71
D/880/1
CMLMICRO [ CML MICROCIRCUITS ]
