82P2821BH IDT, Integrated Device Technology Inc, 82P2821BH Datasheet - Page 40

• Manufacturer Part Number: 82P2821BH
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2821BH

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

Figure-20 Transmit Differential Line Interface with Co-
Functional Description
IDT82P2821
Twisted Pair Cable (transformer-less, non standard
Figure-19 Transmit Differential Line Interface with
Figure-21 Transmit Differential Line Interface with
Twisted Pair Cable (with Transformer)
axial Cable (with transformer)
Note:
In this mode, port protection
should be enhanced.
IM
IM
TTIPn
TRINGn
compliant)
TTIPn
TRINGn
IM
Rt
Rt
TTIPn
TRINGn
Rt
Rt
3.0Vpp
1:2
1:2
4.74 Vpp
6.0 Vpp
21(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
40
3.3.6.2 Transmit Single Ended Mode
applications.
supported. Internal Impedance Matching circuit uses an internal
programmable resistor (IM) only. The T_TERM[2:0] bits (b2~0, TCF0,...)
should be set to ‘011’. The output amplitude is 4.74 Vpp when PULS[3:0]
is ‘0001’ and the SCAL[5:0] bits (b5~0, SCAL,...) is ‘100001’.
and overall setup. Refer to separate application note for details.
Figure-22 Transmit Single Ended Line Interface with
Transmit Single Ended mode can only be used in 75 Ω coaxial cable
In Transmit Single Ended mode, only Internal Impedance Matching is
In Single Ended mode, special care has to be taken for termination
A 1:2 (step up) transformer should be used in application.
Figure-22 shows the connection for one channel.
1. The waveform in this mode is not standard. However, if the arbitrary wave-
form generator is used, the waveform could pass the template marginally.
Coaxial Cable (with transformer)
IM
TTIPn
TRINGn
4.7 µF
1:2
February 6, 2009
4.74 Vpp
1