Pin Configuration
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
- HK
n. c.
ISET
ZOUT
ZIN
ET
LD
LA
n. c.
VBAT
LB
n. c.
GND
n.c.
+CR
-CR
+MIC
- MIC
VCC
+HK
Negative output for transmitter direction
This pin is internally used. It is not permitted to connect any external components.
Control input for loop current
Output, network for hybrid function
Input, network for hybrid funktion
Output, ground key detection
Output, loop current detection
Line output
This pin is internally used. It is not permitted to connect any external components.
Negative supply voltage
Line output
This pin is internally used. It is not permitted to connect any external components.
Ground
This pin is internally used. It is not permitted to connect any external components.
External capacitor for AC/DC selction
External capacitor for AC/DC selction
Positive input for receive direction
Negative input for receive direction
Positive supply voltage
Positive output for transmitter direction
Pin Description
VBAT
VCC
GND
ISET
Supply voltage -24 V
Supply voltage +5 V
Ground
Control input for loop current
Voltage drop on grounded resistor of 23,3 V.
23.3 V
Subscriber line, I
LA/LB
= 120 (I
SET
) = 120
.
R
SET
The subscriber line current is determined by the ISET current.
+MIC; -MIC
Differential input for the receive direction
The input resistance is 10 kΩ per pin, the output voltage in receive direction line
is four times the MIC voltage.
Differential output for the transmitter direction with unit gain of the input signal of the
subscriber line with common mode offset voltage of + 2.5 V
Current node input for hybrid amplifier
Z
NB
= 50 (sum)
Driver output for hybrid function
Logic output for ground key detection (low-aktiv)
Logic output for loop current detection (low-aktiv)
External capacitor for hybrid function
LA, LB
+HK; -HK
ZIN
ZOUT
ET
LD
+CR; -CR
All Pin are ESD protected except PIN 2, 9, 12 and 14.
2
09/00
TFB3869T
GSG [ GUNTER SENICONDUCTOR GMBH. ]
