PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 90

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

2.5.4.2
The integrated receiver uses an adaptively switched threshold detector. The detector controls
the switching of the receiver between two sensitivity levels. The hysteresis characteristics of
the receiver are shown in figure 51.
Figure 51
Switching of the Receiver between High Sensitivity and Low Sensitivity
Semiconductor Group
Adaptive Receiver Characteristics
V
V
V
max
SR2
TR1
V
+ 225 mV
- 225
SR2
750 mV
-
=
V
V
-
Maximum Value of
V
TR2
SR1
mV
0
SR1
V
=
<
<
=
_
_
with
Threshold Voltages of the Receiver Threshold Detector
V
Input Voltage
High Sensitivity
max
V
State 1
Logical 0
Logical
Logical
<
_
<
_
TR1
1
1 V
=
± 225 mV
V
1
0
SR2
-
V
V
max
SR1
in two Consecutive Frames
V
<
during one Frame
max
750
> 1 V or
mV
90
and
V
V
max
max
V
+ 375
<
- 375 mV
SR2
> -750 mV
-1
-
V
V
mV
0 V
SR1
with
Low Sensitivity
V
State
Logical
Logical 1
Logical 0
TR2
Functional Description
750
=
2
± 375
mV V
2
0
_
<
_
<
mV
ITD00774
max
< <
_
_
1
V