Le79228
LINE CARD PARTS LIST- INTERNAL RINGING
Data Sheet
The following list defines the parts and part values required to meet target specification limits for channel i of the line card
(i = 1,2,3,4 or i = 1,2).
Item
U1
i
U2
U3i
U4i
D
VBH
Type
Le79252 device
Le79228x
TISP8200M
TISP8201M
Diode
Value
Tol.
Rating
Comments
Dual ISLIC device
ISLAC device
Bourns
®
Negative Overvoltage
Protector
Bourns
®
Positive Overvoltage
Protector
Optional Components
100 mA
100 V
Required if VoiceEdge Control
Processor (VCP) is not used and
R
FAi
, R
FBi
are PTC components
and R
SAi
, R
SBi
sense resistors are
wired as shown in Figure 3
Fusible resistors or PTC
protection resistors
Sense resistors, pulse
withstanding component
Impedance control resistor
Receive path gain resistor
R
VBH
Resistor
1 kΩ
5%
1/16 W
R
FAi
, R
FBi
R
SAi
, R
SBi
R
Ti
R
RXi
C
VTXi
R
REF
R
SHB
, R
SLB
,
R
SPB
R
HLai
R
HLbi
R
HLci
, R
HLdi
C
HLbi
C
HLdi
C
SSi
R
MT1i
R
MT2i
R
LG1i
R
LG2i
R
REFSi
R
PMGi
R
TESTi
C
ADi
, C
BDi
C
VBH
, C
VBL
,
C
VBP
C
VBFi
C
VCC
Resistor
Resistor
Resistor
Resistor
Capacitor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
50
Ω
200 kΩ
80.6 kΩ
90.9 kΩ
100 nF
69.8 kΩ
750 kΩ
40.2 kΩ
4.32 kΩ
2.87 kΩ
3.3 nF
0.82
µF
33 or
56 pF
3.01 kΩ
75 kΩ
6.04 kΩ
150 kΩ
56.2 kΩ
510Ω
2 kΩ
15 nF
100 nF
1 nF
100 nF
2%
1%
1%
1%
10%
1%
1%
1%
1%
1%
10%
10%
5%
1%
1%
1%
1%
1%
5%
1%
10%
20%
20%
20%
2W
3/4 W
1/16 W
1/16 W
50 V
1/16 W
1/16 W
1/16 W
1/16 W
1/16 W
10 V
10 V
100 V
1/16 W
1/16 W
1/16 W
1/16 W
1/16 W
1W
1W
200 V
100 V
100 V
10 V
Current reference setting resistor
Battery sense resistors
Feed resistor, see VHL networks
for IVD value
Metering resistor
Feed resistors, see VHL networks
for IVD values
Metering capacitor - Not Polarized
Feed capacitor -Ceramic
Metering capacitor -Ceramic, use
33 pF for 3.2 Vrms max. or 56 pF
for 5.0 Vrms max. metering.
Metallic loop current gain resistor
Metallic loop current resistor for
high gain selection
Longitudinal loop current gain
resistor
Longitudinal loop current resistor
for high gain selection
Value should be adjusted to suit
application
Test load
Ceramic, X7R dielectric
Ceramic
Ceramic
Optional for testing
Required for testing, tie RLG1i to
VREF if not used
Required for testing, tie RMT1i to
VREF if not used
Only required for metering > 2.2
Vrms, otherwise omit
Required for metering
Required for metering
30
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
