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
Type
Value
Tol.
Rating
Comments
Optional Components
U1i
U2
Le79252 device
Le79228x
Dual ISLIC device
ISLAC device
®
Bourns Negative Overvoltage
U3i
U4i
TISP8200M
Protector
®
Bourns Positive Overvoltage
TISP8201M
Diode
Protector
DVBH
100 mA
100 V
Required if VoiceEdge Control
Processor (VCP) is not used and
R
FAi, RFBi are PTC components
RVBH
Resistor
1 kΩ
5%
1/16 W
and RSAi, RSBi sense resistors are
wired as shown in Figure 3
Fusible resistors or PTC
protection resistors
Sense resistors, pulse
withstanding component
RFAi, RFBi
Resistor
Resistor
50 Ω
2%
1%
2 W
RSAi, RSBi
200 kΩ
3/4 W
RTi
Resistor
Resistor
Capacitor
Resistor
80.6 kΩ
90.9 kΩ
100 nF
69.8 kΩ
1%
1%
10%
1%
1/16 W
1/16 W
50 V
Impedance control resistor
Receive path gain resistor
RRXi
CVTXi
RREF
1/16 W
Current reference setting resistor
Battery sense resistors
RSHB, RSLB
RSPB
,
Resistor
750 kΩ
1%
1/16 W
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
1/16 W
Metering resistor
Required for metering
Feed resistors, see VHL networks
for IVD values
RHLci, RHLdi
CHLbi
CHLdi
Capacitor
Capacitor
3.3 nF
10%
10%
10 V
10 V
Metering capacitor - Not Polarized Required for metering
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
Resistor
Resistor
3.01 kΩ
75 kΩ
1%
1%
1/16 W
1/16 W
Metallic loop current gain resistor
Metallic loop current resistor for
high gain selection
Required for testing, tie RMT1i to
VREF if not used
Longitudinal loop current gain
resistor
RLG1i
Resistor
6.04 kΩ
1%
1/16 W
Longitudinal loop current resistor
for high gain selection
Required for testing, tie RLG1i to
VREF if not used
RLG2i
Resistor
Resistor
Resistor
150 kΩ
56.2 kΩ
510Ω
1%
1%
5%
1/16 W
1/16 W
1 W
RREFSi
RPMGi
Value should be adjusted to suit
application
RTESTi
Resistor
2 kΩ
1%
1 W
Test load
Optional for testing
CADi, CBDi
Capacitor
15 nF
10%
200 V
Ceramic, X7R dielectric
CVBH, CVBL
CVBP
,
Capacitor
100 nF
20%
100 V
Ceramic
Ceramic
CVBFi
CVCC
Capacitor
Capacitor
1 nF
20%
20%
100 V
10 V
100 nF
30
Zarlink Semiconductor Inc.
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