Le79228
Data Sheet
LINE CARD PARTS LIST - EXTERNAL RINGING
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
Type
Le79232 device
Le79228x
Value
Tol.
Rating
Comments
Dual ISLIC device
Optional Components
U1i
U2
U3i
ISLAC device
LCAS device
Le75282
®
Bourns Overvoltage Protector or
U4i
U5i
TISP4125H3
±125 V
equivalent
®
+125 V,
-250 V
Bourns Asymmetrical Overvoltage
TISP4A250H3
Protector or equivalent
®
FAi, FBi
B1250T
Resistor
1.25 A
600 V
1/2 W
Bourns Fuse
Sense resistors, pulse withstanding
component
RSAi, RSBi
200 kΩ
1%
RTi
Resistor
Resistor
Capacitor
Resistor
Resistor
80.6 kΩ
90.9 kΩ
100 nF
69.8 kΩ
750 kΩ
1%
1%
10%
1%
1%
1/16 W
1/16 W
50 V
Impedance control resistor
Receive path gain resistor
RRXi
CVTXi
RREF
1/16 W
1/16 W
Current reference setting resistor
Battery sense resistors
RSHB, RSLB
Feed resistor, see VHL networks for IVD
value
RHLai
RHLbi
Resistor
Resistor
Resistor
40.2 kΩ
4.32 kΩ
2.87 kΩ
1%
1%
1%
1/16 W
1/16 W
1/16W
Metering resistor
Required for metering
Required for metering
Feed resistors, see VHL networks for IVD
values
R
HLci, RHLdi
CHLbi
CHLdi
Capacitor
Capacitor
3.3 nF
10%
10%
10 V
10 V
Metering capacitor - Not Polarized
Feed capacitor -Ceramic
0.82 µF
Metering capacitor -Ceramic, use 33 pF
for 3.2 Vrms max. or 56 pF for 5.0 Vrms
max. metering.
33 or
56 pF
Only required for metering >
2.2 Vrms, otherwise omit
CSSi
Capacitor
5%
100 V
RMT1i
RMT2i
RLG1i
RLG2i
RREFSi
RPMGi
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
3.01 kΩ
75 kΩ
1%
1%
1%
1%
1%
5%
1/16 W
1/16 W
1/16 W
1/16 W
1/16 W
1 W
Metallic loop current gain resistor
Metallic loop current resistor for high gain Required for testing, tie
selection
RMT1i to VREF if not used
6.04 kΩ
150 kΩ
56.2 kΩ
510Ω
Longitudinal loop current gain resistor
Longitudinal loop current resistor for high Required for testing, tie
gain selection
RLG1i to VREF if not used
Value should be adjusted to suit
application
Test load, power rating assumes
intermittent operation per test algorithms
RTEST(i)
Resistor
2 kΩ
1%
1 W
Optional for testing
CTESTA
CTESTB
ADi, CBDi
,
Refer to Le75282 data sheet
for applicability
Capacitor
1 nF
20%
100 V
Test bus capacitors
C
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Resistor
15 nF
100 nF
1 nF
10%
20%
20%
20%
20%
20%
1%
200 V
100 V
100 V
10 V
Ceramic, X7R dielectric
Ceramic
CVBH, CVBL
CVBFi
Ceramic
CVCC
100 nF
100 nF
33 µF
3.3 Ω
CVCCD
CVCCA
RVCCA
CVRNi
10 V
6.3 V
1/16 W
10 V
Tantalum
Capacitor
100 nF
20%
33
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
