Marine VHF Audio and Signalling Processor
CMX885
AC Parameters (continued)
Notes
Min.
Typ.
Max.
Unit
Modulator Outputs 1/2 and Audio Output
(MOD1, MOD2, AUDIO)
Power-up to Output Stable
Modulator Attenuators
Attenuation (at 0dB)
41
43
–
50
0
100
µs
dB
dB
Ω
kΩ
µA
V
+1.0
−1.0
Cumulative Attenuation Error
(wrt attenuation at 0dB)
Output Impedance
⎫
⎭
0
600
500
–
–
–
+0.6
–
–
±125
AVDD –0.5
–
−0.6
–
–
–
0.5
20
42
42
⎫ Enabled
⎭ Disabled
Output Current Range (AVDD = 3.3V)
Output Voltage Range
Load Resistance
Audio Attenuator
Attenuation (at 0dB)
44
43
kΩ
0
+1.0
dB
−1.0
Cumulative Attenuation Error
(wrt attenuation at 0dB)
Output Impedance
⎫
⎭
0
600
500
–
–
–
+1.0
–
–
±125
AVDD –0.5
–
dB
−1.0
–
–
–
0.5
20
42
42
Ω
kΩ
µA
V
⎫ Enabled
⎭ Disabled
Output Current Range (AVDD = 3.3V)
Output Voltage Range
Load Resistance
44
kΩ
41
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 for all blocks, except the XTAL and C-BUS interface, to be placed in powersave
mode.
Notes:
BIAS
42
43
44
Small signal impedance, at AVDD = 3.3V and Tamb = 25°C.
With respect to the signal at the feedback pin of the selected input port.
Centred about AVDD/2; with respect to the output driving a 20kΩ load to AVDD/2.
© 2010 CML Microsystems Plc
63
D/885/3
CMLMICRO [ CML MICROCIRCUITS ]
