AM7996 查看數據表（PDF） - Advanced Micro Devices
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AM7996 Datasheet PDF : 18 Pages
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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
AMD
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.
PE64102/PE64107 (or equivalent)
(75 µH)
1:1
COLL
1:1
RCV
1:1
XMT
R1
40.2 Ω
1%
R2
40.2 Ω
1%
1 VCC1
VCC2 20
2 CI+ COLL OSC 19
3 CI–
VCOL 18
4 DI+
NC 17
Am7996
R3 5 DI–
RXT 16
174 Ω 6
1%
7
(Note 3)
VCREF
SQE^TEST
NC 15
Tap 14
Shield
8 DO+
VTX- 13
9 DO–
TXT 12
10 VEE
VTX+ 11
Power (DTE)
–9 V
GND
R4
1% 1.1 kΩ
C1
39 pF
(Note 6)
C2
0.1 µF
Coax
Connector
R6
CL
24.9 kΩ
(Note 1) 1%
R5
75 kΩ
1%
(Note 5)
180 pF C3
R8
9.09 Ω
1%
1N4001
D3
R7
9.09 Ω
1%
CC (Note 1)
(Note 2)
D2 D1
1N4150
MAU Power Supply
(Note 4)
Notes:
1. CL is the effective load capacitance across R6; CC is the compensation capacitance (CC = 1/3 CL).
2. D2 can be eliminated in Cheapernet (IEEE 802.3, 10BASE2) applications.
3. Shown with SQE Test disabled.
4. Discrete Power Supply or Hybrid-Hybrid DC-DC Converter Manufacturers include:
Ethernet (IEEE 802.3, 10BASE5)
Reliability: 2E12R9
Valor Electronics: PM1001
Cheapernet (IEEE 802.3, 10BASE2)
Reliability Inc: 2VP5U9
Valor Electronics: PM7102
5. The capacitance of C3, Am7996 package, D3 and the printed circuit board should add up to 180 pF ± 20%.
6. The capacitance of C1, Am7996 package and the printed circuit board should add up to 39 pF.
7. Figure 2 used for production testing of all parameters that are tested.
07506E-5
Figure 2. Am7996 External Component Diagram for Transmit Mode Collision Detect
Am7996
7
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