82P2281PFG IDT, Integrated Device Technology Inc, 82P2281PFG Datasheet - Page 99
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82P2281PFG
Manufacturer Part Number
82P2281PFG
Description
Manufacturer
IDT, Integrated Device Technology Inc
Datasheet
1.82P2281PFG.pdf
(371 pages)
Specifications of 82P2281PFG
Number Of Transceivers
1
Screening Level
Industrial
Mounting
Surface Mount
Package Type
TQFP
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Lead Free Status / RoHS Status
Compliant
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Part Number:
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3.26
ized by using internal impedance matching circuit. 100 Ω , 110 Ω , 75 Ω
or 120 Ω internal impedance matching circuit can be selected by the
T_TERM[1:0] bits. The external impedance circuitry is not supported in
T1/J1 mode.
by using internal impedance matching circuit or external impedance
matching circuit. When the T_TERM[2] bit is ‘0’, the internal impedance
matching circuit is enabled. 100 Ω , 110 Ω , 75 Ω or 120 Ω internal
impedance matching circuit can be selected by the T_TERM[1:0] bits.
When the T_TERM[2] bit is ‘1’, the internal impedance matching circuit
is disabled, and different external resistors should be used to realize dif-
ferent impedance matching.
cable. Table 75 lists the recommended impedance matching values for
the transmitter.
Table 75: Impedance Matching Value For The Transmitter
Table 76: Related Bit / Register In Chapter 3.25 & Chapter 3.26
IDT82P2281
Configuration
120 Ω (E1)
100 Ω (T1)
110 Ω (J1)
75 Ω (E1)
T_TERM[2:0]
In T1/J1 mode, the transmitter impedance matching can be real-
In E1 mode, the transmitter impedance matching can be realized
Figure 2 shows the appropriate components to connect with the
Cable
DFM_ON
DF_IES
DF_IS
DF_IE
DF_S
T_HZ
XTS
Bit
TRANSMITTER IMPEDANCE MATCHING
T_TERM[2:0]
Transmit And Receive Termina-
Internal Termination
Interrupt Trigger Edges Select
0 0 0
0 0 1
0 1 0
0 1 1
Interrupt Enable Control 0
Transmit Configuration 1
Transmit Timing Option
Line Status Register 0
tion Configuration
Interrupt Status 0
Register
0 Ω
R
T
T_TERM[2:0]
External Termination
1 X X
-
-
Address (Hex)
03A
023
070
036
035
033
032
9.4 Ω
R
-
-
T
99
SINGLE T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
August 20, 2009
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