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A-wire, B-wire DC- Levels, Impedances
Table 22: Voltage Characteristics A Wire (Aw), B Wire (Bw)
Symbol
Parameter
Vawn
Normal DC-bias on AW(ref. GNDB)
Vbwn
Normal DC-bias on BW(ref. BAT)
Vawr
Reverse polarity DC-bias on AW (ref BAT)
Vbwr
Reverse polarity DC-bias on BW (ref. GNDB)
Vaw_h
DC bias on AW in Act_H mode (TST=1, ref. GNDB)
Vbw_h
DC bias on BW in Act_H mode (TST=1, ref. BAT)
Vhwpd
Voltage level high wire (IL<5mA)
Vlwpd
Voltage level low wire (IL<5mA), ref BAT
Vawring
DC-level both wires in ringing mode (TST=0)
Vbwring
Note:
These BIAS values are only valid if both DCC and RX are biased at VAG voltage level.
Table 23: Impedance Characteristics A Wire (Aw), B Wire (Bw)
Symbol
Parameter
Za(b)wo
Output impedance at AW (BW)
(*)
(power up)
Za-bwo
Tracking of the output impedance
(*)
onAW and BW
Zhwod
Output impedance on high wire
(power down)
Zlwod
Output impedance on low wire
(power down)
Zomd
Matching output impedance low vs
high wire (power down)
Ia(b)OC
Output current in and out AW (BW)
Ia(b)HIMP
with OT (over-temperature) detected
MTK-40131
Test Conditions
PU
BR
RNG Min.
1
0
0
1
0
0
1
1
0
1
1
0
1
x
1
1
x
1
0
x
0
0
x
0
1
0
1
Test Conditions
Limits
Min.
0mA<IL<70mA
0<f<16 kHz
0mA<IL<70mA
0<f<16 kHz
PU=0
5
PU=0
5
PU=0
-70
A(B)W_GNDB
-700
and
A(B)W_BATS
31
Limits
Unit
Typ.
Max.
-3.5
-3.1
-2.7
V
2.5
3
3.5
V
2.5
3
3.5
V
-3.5
-3.1
-2.7
V
-4
-3
-2
V
2
3
4
V
-0.8
-0.5
V
0.5
0.8
V
BAT/2 BAT/2
BAT/2
V
-2%
+2%
Unit
Typ.
Max.
1.5
ohm
0.3
ohm
130
ohm
130
ohm
70
ohm
+700
µA
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