le79r79 Zarlink Semiconductor, le79r79 Datasheet - Page 12

• Manufacturer Part Number: le79r79
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

Loop Detector
Relay Driver Output
(Relay 1 and 2)
RELAY DRIVER SCHEMATIC
Note:
1.
Unless otherwise noted, test conditions are BAT1 = –75 V, BAT2 = –24 V, V
R
two-wire AC input impedance (ZSL) is a 600 Ω resistance synthesized by the programming network shown below.
R
R
DC1
SGL
SLEW
= 80 kΩ, R
= open, R
R
threshold
V
V
I
Zener breakover (each output)
Zener on voltage (each output)
OH
OL
OL
LTH
= 100 kΩ, C
, Off leakage (each output)
, On voltage (each output)
, On voltage (each output)
, Loop-resistance detect
SGH
DC2
Description
Description
= 20 kΩ, R
= open, R
SLEW
= 0.33 µF.
DCR1
D
= 75 kΩ, no fuse resistors, C
Figure 2. AC Input Impedance Programming Network
= 15 kΩ, R
RSN
VTX
BGND
R
R
Active, V
Active, V
Standby
I
I
V
I
I
OL
OL
Z
Z
DCR2
T1
T2
OH
= 100 µA
= 30 mA
Test Conditions (See Note 1)
Test Conditions (See Note 1)
= 30 mA
= 40 mA
= 150 k Ω
= 150 k Ω
= +5 V
= 2 kΩ, C
Zarlink Semiconductor Inc.
RYOUT1
BAT1
BAT2
RYE
HP
DCR
= 0.018 µF, C
12
= 10 nF, R
R
RX
= 300 k Ω
CC
RT1
DC
= +5 V, V
C
BGND
= 430 kΩ, R
= 1.2 µF, D
T1
= 60 pF
Min
−20
−20
−15
Min
6.6
NEG
V
1
= –5 V, R
RT2
RX
RYOUT2
= D
= 12 kΩ, C
2
+0.25
+0.30
Typ
Typ
7.9
= 1N400x,
11
L
= 600 Ω,
RT
Max
Max
+0.4
+0.8
100
20
20
15
= 1.5 µF,
Unit
Unit
µA
%
V
V
Note
Note
9
4