82P2821BH IDT, Integrated Device Technology Inc, 82P2821BH Datasheet - Page 31

• 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

Functional Description
IDT82P2821
Twisted Pair Cable (transformer-less, non standard
Figure-10 Receive Differential Line Interface with
Note:
6.0Vpp
1. Two Rr/2 resistors should be connected to VCOM[1:0] that are
coupled to ground via a 10 µF capacitor, which provide 60 Ω
common mode input resistance.
2. In this mode, lightning protection should be enhanced.
3. The maximum input dynamic range of RTIP/TRING pin is
-0.3 V ~3.6 V (in line monitor mode it is -0.3 V ~ 2 V)
Rr/2
Rr/2
compliant)
RRINGn
RTIPn
10 µF
VCOM1
IM
VCOM0
21(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
31
3.2.1.2 Receive Single Ended Mode
applications.
supported. External Impedance Matching circuit uses an external
resistor (Rr) only. The value of the resistor is 18.75 Ω (see Figure-11 for
details) when the single end is connected with a 2:1 transformer or is 75
Ω (see Figure-12 for details) when the single end is connected without a
transformer.
the configuration of the R_TERM[2:0] bits (b2~0, RCF0,...) is ignored.
Figure-11 Receive Single Ended Line Interface with Co-
Figure-12 Receive Single Ended Line Interface with Co-
axial Cable (transformer-less, non standard compliant)
Receive Single Ended mode can only be used in 75 Ω coaxial cable
In Receive Single Ended mode, only External Impedance Matching is
In Receive Single Ended mode, the RIM pin should be left open and
4.74 Vpp
4.74 Vpp
Note:
In this mode, port protection should be enhanced.
axial Cable (with transformer)
2:1
Rr = Rr1 + Rr2 = 75 Ω
Rr1
Rr2
Rr
470 nF
470 nF
RRINGn
RRINGn
RTIPn
RTIPn
February 6, 2009
IM
IM