DS90UR124QVS/NOPB National Semiconductor, DS90UR124QVS/NOPB Datasheet - Page 20

• Manufacturer Part Number: DS90UR124QVS/NOPB
• Description: IC SER/DESER 5-43MHZ 24B 64-TQFP
• Manufacturer: National Semiconductor

Specifications of DS90UR124QVS/NOPB

• Function: Serializer/Deserializer
• Data Rate: 1.03Gbps
• Input Type: LVCMOS
• Output Type: LVDS
• Number Of Inputs: 24
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP, 64-VQFP
• Serdes Function: Deserializer
• No. Of Inputs: 1
• No. Of Outputs: 24
• Supply Voltage Range: 3V To 3.6V
• Driver Case Style: TQFP
• No. Of Pins: 64
• Msl: MSL 3 - 168 Hours
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Digital Ic Case Style: TQFP
• For Use With: SERDESUR-43USB - BOARD EVAL DS90UR124,DS90UR241
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: DS90UR124QVS

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POWER CONSIDERATIONS
An all LVCMOS design of the Serializer and Deserializer
makes them inherently low power devices. Additionally, the
constant current source nature of the LVDS outputs minimize
the slope of the speed vs. I
NOISE MARGIN
The Deserializer noise margin is the amount of input jitter
(phase noise) that the Deserializer can tolerate and still reli-
ably recover data. Various environmental and systematic fac-
tors include:
For a graphical representation of noise margin, please see .
TRANSMISSION MEDIA
The Serializer and Deserializer are to be used in point-to-point
configuration, through a PCB trace, or through twisted pair
cable. In a point-to-point configuration, the transmission me-
Serializer: V
out-of-band noise)
Media: ISI, V
Deserializer: V
DD
CM
DD
noise, TCLK jitter (noise bandwidth and
noise
noise
DD
curve of LVCMOS designs.
FIGURE 18. DS90UR241 Typical Application Connection
20
dia needs be terminated at both ends of the transmitter and
receiver pair. Interconnect for LVDS typically has a differential
impedance of 100 Ohms. Use cables and connectors that
have matched differential impedance to minimize impedance
discontinuities. In most applications that involve cables, the
transmission distance will be determined on data rates in-
volved, acceptable bit error rate and transmission medium.
The resulting signal quality at the receiving end of the trans-
mission media may be assessed by monitoring the differential
eye opening of the serial data stream. The Receiver Input
Tolerance and Differential Threshold Voltage specifications
define the acceptable data eye opening. A differential probe
should be used to measure across the termination resistor at
the DS90UR124 inputs.
and relationship to the Receiver Input Tolerance and Differ-
ential Threshold Voltage specifications
Figure 19
illustrates the eye opening
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