dp83848qsqx/nopb National Semiconductor Corporation, dp83848qsqx/nopb Datasheet - Page 11

• Manufacturer Part Number: dp83848qsqx/nopb
• Description: Phyter Extended Temperature Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver
• Manufacturer: National Semiconductor Corporation

TD-, TD+
RD-, RD+
RBIAS
PFBOUT
PFBIN1
PFBIN2
RESERVED
IOVDD33
IOGND
DGND
AVDD33
AGND
GNDPAD
7.7 10 Mb/s AND 100 Mb/s PMD INTERFACE
7.8 SPECIAL CONNECTIONS
7.9 POWER SUPPLY PINS
Signal Name
Signal Name
Signal Name
Type
I/O
O
I
I
Type
I/O
I/O
8, 9, 10
Pin #
20
19
16
30
Pin #
14
15
11
12
Bias Resistor Connection: A 4.87 kΩ 1% resistor should be connected from RBIAS to
GND.
Power Feedback Output: Parallel caps, 10µF (Tantalum preferred) and 0.1µF, should
be placed close to the PFBOUT. Connect this pin to PFBIN1 (pin 18) and PFBIN2 (pin
37). See Section
Power Feedback Input: These pins are fed with power from PFBOUT pin. A small
capacitor of 0.1µF should be connected close to each pin.
Note: Do not supply power to these pins other than from PFBOUT.
RESERVED: These pins must be left unconnected.
Differential common driver transmit output (PMD Output Pair). These differential outputs
are automatically configured to either 10BASE-T or 100BASE-TX signaling.
IIn Auto-MDIX mode of operation, this pair can be used as the Receive Input pair.
These pins require 3.3V bias for operation.
Differential receive input (PMD Input Pair). These differential inputs are automatically
configured to accept either 100BASE-TX or 10BASE-T signaling.
In Auto-MDIX mode of operation, this pair can be used as the Transmit Output pair.
In 100BASE-FX mode, this pair becomes the 100BASE-FX Receive pair.
These pins require 3.3V bias for operation.
Section 11.4 POWER FEEDBACK CIRCUIT
13, 17
Pin #
1, 26
DAP
11
40
29
18
I/O 3.3V Supply
I/O Ground
Digital Ground
Analog 3.3V Supply
Analog Ground
No connect or connect to Ground
See
Description
Description
(Note
1)
Description
for proper placement pin.
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