AM7996DCTR AMD [Advanced Micro Devices], AM7996DCTR Datasheet - Page 7

• Manufacturer Part Number: AM7996DCTR
• Description: IEEE 802.3/Ethernet/Cheapernet Transceiver
• Manufacturer: AMD [Advanced Micro Devices]

Figure 2 is an external component diagram showing
how to implement the transmit mode collision detect
levels recommended by IEEE 802.3. Figure 3 on the
following page shows how to implement the receive
mode collision detect levels recommended by
IEEE 802.3. Receive mode collision detect threshold
Notes:
1.
2.
3.
4.
6.
7.
5.
PE64102/PE64107 (or equivalent)
COLL
RCV
XMT
C
D2 can be eliminated in Cheapernet (IEEE 802.3, 10BASE2) applications.
Shown with SQE Test disabled.
Discrete Power Supply or Hybrid-Hybrid DC-DC Converter Manufacturers include:
The capacitance of C3, Am7996 package, D3 and the printed circuit board should add up to 180 pF
The capacitance of C1, Am7996 package and the printed circuit board should add up to 39 pF.
Figure 2 used for production testing of all parameters that are tested.
L
is the effective load capacitance across R6; C
Ethernet (IEEE 802.3, 10BASE5)
Reliability: 2E12R9
Valor Electronics: PM1001
Cheapernet (IEEE 802.3, 10BASE2)
Reliability Inc: 2VP5U9
Valor Electronics: PM7102
Power (DTE)
Figure 2. Am7996 External Component Diagram for Transmit Mode Collision Detect
(75 H)
1:1
1:1
1:1
MAU Power Supply
(Note 4)
40.2
40.2
1%
1%
R1
R2
–9 V
GND
174
1%
R3
(Note 3)
10
1
4
5
6
8
2
3
7
9
C
CI–
DI–
DI+
DO–
CI+
VC REF
DO+
V CC1
SQE^TEST
V EE
is the compensation capacitance (C
Am7996
Am7996
COLL OSC
levels of the Am7996 are implemented by adding R9,
R10 and C4. For the values of the components shown in
Figure 3, a nominal receive mode collision detect
threshold of –1.5 V, for a –1.404 V to –1.581 V window,
is achieved.
V COL
V CC2
Shield
V TX+
V TX-
RXT
TXT
Tap
NC
NC
19
18
17
16
15
14
13
12
20
11
1%
9.09
R8
1%
(Note 5)
1.1 k
180 pF
R4
(Note 6)
(Note 1)
39 pF
C L
C3
C
C1
= 1/3 C
24.9 k
0.1 F
1N4001
D3
9.09
L
1%
C2
R6
).
1%
R7
20%.
(Note 2)
C C
Connector
75 k
D2
1%
Coax
R5
(Note 1)
1N4150
AMD
07506E-5
D1
7