Electrical Characteristics
Table 4-8. Differential Transmitter (TX) DC Output Specifications (Sheet 2 of 2)
Symbol
Parameter
Min
Nom Max Units Comments
RLTX-CM
Common Mode Return
Loss
6
dB
Measured over 50 MHz to 1.25
GHz
See Note 2.
ZTX-DIFF-DC
DC Differential TX
Impedance
80
100
120
200
W
W
TX DC Differential Mode Low
impedance
ZTX-COM- DC Transmitter Common
Mode High Impedance
State (DC)
40k
Required TX D+ as well as D- DC
impedance during all states.
CTX
AC Coupling Capacitor
75
nF
All transmitters shall be AC
coupled. The AC coupling is
required either within the media or
within the transmitting component
itself.
NOTES:
1. Specified at the measurement point into a timing and voltage compliance test load as shown in Figure 4-2
and measured over any 250 consecutive TX UIs. (Also refer to the Transmitter Compliance Eye Diagram as
shown in Figure 4-1.)
2. The transmitter input impedance shall result in a differential return loss greater than or equal to 12 dB and a
common mode return loss greater than or equal to 6 dB over a frequency range of 50 MHz to 1.25 GHz. This
input impedance requirement applies to all valid input levels. The reference impedance for return loss
measurements is 50Ω to ground for both the D+ and D- line (i.e., as measured by a Vector Network Analyzer
with 50Ω probes – see Figure 4-2). Note that the series capacitors CTX is optional for the return loss
measurement.
4.1.7.1.2
Differential Receiver (RX) DC Input Specifications
Table 4-9 defines the DC specifications of parameters for all differential receivers (RXs). The
parameters are specified at the component pins.
Table 4-9. Differential Receiver (RX) DC Input Specifications (Sheet 1 of 2)
Symbol
Parameter
Min
Nom
Max
Units Comments
VRX-DIFFp-p
Differential InputPeak 0.175
to Peak Voltage
1.200
V
VRX-DIFFp-p = 2*|VRX-D+ - VRX-D-|
See Note 1.
VRX-CM-ACp
AC Peak Common
Mode Input Voltage
150
mV
VRX-CM-AC=|VRX-D+
– VRX-CM-DC
+ VRX-D-|/2
VRX-CM-DC = DC(avg) of |VRX-D+
+VRX-D-|/2 during L0
See Note 1.
RLRX-DIFF
Differential Return
Loss
15
dB
Measured over 50 MHz to 1.25
GHz with the D+ and D- lines
biased at +300 mV and -300
mV, respectively.
See Note 2.
RLRX-CM
Common Mode
Return Loss
6
dB
W
Measured over 50 MHz to 1.25
GHz with the D+ and D- lines
biased at 0 V.
See Note 2
ZRX-DIFF-DC
DC Differential Input
Impedance
80
100
120
RX DC Differential Mode
impedance. See Note 3.
160
Intel® 6702PXH 64-bit PCI Hub Datasheet
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