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Part
IC
R1
R2
R3
R4
R5
R6
R7
Number
Manufacturer
PE-68025
AMD
TXD (+) = 61.9
TXP (+) = 422
TXD (-) = 61.9
TXP (-) = 422
1.2k
RX (+) = 49.9
RX (-) = 49.9
PE-68026
Various
N/A
N/A
N/A
N/A
N/A
N/A
N/A
PE-68027
National
TXOD (-) = 274
TXO (+) = 66.5
TXO (-) = 66.5
TXOD (+) = 274
806
RX (+) = 49.9
RX (-) = 49.9
Resistor Values (
Ω)
Schematics
LPF
ANALOG INTERFACE MODULE
RJ-45
CONNECTOR
UTP
TD-
TD+
RD+
RD-
16
LPF
LPF
LPF
15
14
13
12
11
10
9
12
3
4
5
6
7
8
2
1
3
6
.01µF
RXI+
RXI-
R1
R2
R3
R4
R5
R6
R7
TWISTED
PAIR
TRANSMIT
OUTPUTS
LOW PASS
FILTER
5
8
6
LOW PASS
FILTER
7
4
1
TRANSMIT CHANNEL
CHIP SIDE
UTP SIDE
1:1
100
Ω
LOW PASS
FILTER
16
14
12
9
11
LOW PASS
FILTER
10
RECEIVE CHANNEL
CHIP SIDE
UTP SIDE
1:1
100
Ω
PE-68025, PE-68026, PE-68027
Typical Application Circuit
PE-68025, PE-68026, PE-68027
SURFACE MOUNT 10BASE-T
INTERFACE MODULES
Fully Integrated for Adapter, Hub, and
Motherboard Applications
2
E115.A (9/97)
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