CMX138 CML Microcircuits, CMX138 Datasheet - Page 65

• Manufacturer Part Number: CMX138
• Description: Audio Scrambler and Sub-Audio Signalling Processor
• Manufacturer: CML Microcircuits

Audio Scrambler and Sub-Audio Signalling Processor
© 2008 CML Microsystems Plc
Notes:
AC Parameters
Modulator Output and Audio Output
(MOD, AUDIO)
Power-up to output stable
Modulator Attenuator
Attenuation (at 0dB)
Cumulative Attenuation Error
Output Impedance
Output current range (AV
Output voltage range
Load resistance
Audio Attenuator
Attenuation (at 0dB)
Cumulative Attenuation Error
Output Impedance
Output current range (AV
Output voltage range
Load resistance
(wrt attenuation at 0dB)
(wrt attenuation at 0dB)
41
42
43
44
Power-up refers to issuing a C-BUS command to turn on an output. These limits
apply only if V BIAS 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 in placed in
powersave mode.
Small signal impedance, at AV
With respect to the signal at the feedback pin of the selected input port.
Centred about AV
DD
DD
⎫ Enabled
⎭ Disabled
⎫ Enabled
⎭ Disabled
= 3.3V)
= 3.3V)
DD
⎫
⎭
⎫
⎭
/2; with respect to the output driving a 20kΩ load to AV
Page 65
DD
Notes
41
43
42
42
44
43
42
42
44
= 3.3V and Tamb = 25°C.
Min.
−1.0
−1.0
−1.0
−1.0
0.5
0.5
80
80
–
–
–
–
–
–
–
Typ.
200
200
50
0
0
6
–
–
–
0
0
6
–
–
–
AV
AV
Max.
±125
±125
DD
DD
+1.0
+1.0
+1.0
+1.0
100
–
–
–
–
–
–
–0.5
–0.5
D/138_FI1.0/5
DD
CMX138
Unit
dB
kΩ
µA
kΩ
dB
dB
kΩ
µA
kΩ
dB
µs
/2.
Ω
Ω
V
V