CMX138 CML Microcircuits, CMX138 Datasheet - Page 64

• 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
XTAL/CLK Input
Auxiliary System Clk Output
V
Microphone, Discriminator Inputs (MIC, DISC)
BIAS
‘High’ pulse width
‘Low’ pulse width
Input impedance (at 6.144MHz)
Xtal start up (from powersave)
XTAL/CLK input to CLOCK_OUT timing:
‘High’ pulse width
‘Low’ pulse width
Start up time (from powersave)
Input impedance
Maximum Input Level (pk-pk)
Load resistance (feedback pins)
Amplifier open loop voltage gain ⎫
Unity gain bandwidth
Programmable Input Gain Stage
Gain (at 0dB)
Cumulative Gain Error
(I/P = 1mV rms at 100Hz)
(wrt attenuation at 0dB)
31
32
33
34
35
36
37
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Timing for an external input to the XTAL/CLK pin.
XTAL/CLK input driven by an external source.
6.144MHz XTAL fitted and 6.144MHz output selected.
With no external components connected.
Centered about AV
components connected).
Gain applied to signal at output of buffer amplifier: DiscFB, or MicFB.
Design Value. Overall attenuation input to output has a tolerance of 0dB ±1.0dB.
(in high to out high)
(in low to out low)
Resistance
Capacitance
Resistance
Capacitance
⎭
⎫
⎭
DD
/2; after multiplying by the gain of input circuit (with external
Page 64
Notes
31
31
32
32
33
33
34
35
36
37
37
Min.
−0.5
−1.0
15
15
76
76
80
–
–
–
–
–
–
–
–
–
–
–
–
81.38
81.38
Typ.
150
300
400
1.0
20
20
15
15
30
60
–
–
1
–
–
0
0
Max.
80%
+0.5
+1.0
87
87
–
–
–
–
–
–
–
–
–
–
–
–
–
–
D/138_FI1.0/5
AV
CMX138
MHz
Unit
MΩ
ms
ms
kΩ
kΩ
kΩ
dB
dB
pF
pF
dB
ns
ns
ns
ns
ns
ns
DD