Texas Instruments | Using TI's CDCV304 w/Backplane Transceiver (TLK1201/1501/2201/2501/2701/3101) (Rev. A) | Application notes | Texas Instruments Using TI's CDCV304 w/Backplane Transceiver (TLK1201/1501/2201/2501/2701/3101) (Rev. A) Application notes

Texas Instruments Using TI's CDCV304 w/Backplane Transceiver (TLK1201/1501/2201/2501/2701/3101) (Rev. A) Application notes
Application Report
SCAA052A – November 2001 – Revised April 2006
Using TI’s CDCV304 with Backplane Transceiver
(TLK1201, TLK1501, TLK2201, TLK2501, TLK2701,
TLK2711, and TLK3101)
Firoj Kabir
HPA/CDC
ABSTRACT
This application note discusses TI’s CDCV304 output jitter when driving serial backplane
transceivers, namely, TLK1201, TLK1501, TLK2201, TLK2501, TLK2701, TLK2711, and
TLK3101. Measurement shows that the CDCV304 clock driver generates 20-ps p-p jitter
on average; hence it is suitable to drive any serial backplane transceivers fulfilling all the
requirements.
Contents
Introduction .............................................................................................................................................2
Jitter Performance of CDCV304 (Driven by HP8133A Signal Generator) ..........................................2
Test Equipment Setup for Driving Backplane Transceiver.................................................................4
Recommended Termination for CDCV304 Clock Driver......................................................................5
Test Summary .........................................................................................................................................5
Jitter Performance of CDCV304 + TLK1201 Combination................................................................6
Jitter Performance of CDCV304 + TLK1501 Combination................................................................7
Jitter Performance of CDCV304 + TLK2501 Combination................................................................8
Jitter Performance of CDCV304 + TLK3101 Combination................................................................9
Conclusion ..............................................................................................................................................9
References.............................................................................................................................................10
Figures
Figure 1. Indicates Various Jitter Measurement Points ...................................................................2
Figure 2. Peak-to-Peak and RMS Jitter of HP Signal Generator (Point 1) ......................................3
Figure 3. Peak-to-Peak and RMS Jitter of CDCV304 Driver Output (Point 2) .................................3
Figure 4. Peak-to-Peak Jitter of CDCV304 Driver Output (Point 2 Over Industrial
Temperature Range) ...........................................................................................................4
Figure 5. Test Equipment Setup .........................................................................................................4
Figure 6. Thevenin Termination for CDCV304 Clock Driver ............................................................5
Figure 7. Jitter Values at Different Points Shown in Figure 5 With TLK1201.................................6
Figure 8. Jitter Values at Different Points Shown in Figure 5 With TLK1501.................................7
Figure 9. Jitter Values at Different Points Shown in Figure 5 With TLK2501.................................8
Figure 10. Jitter Values at Different Points Shown in Figure 5 With TLK3101.................................9
Tables
Table 1. Recommended Clock Drivers for Serial / Gigabit Transceivers .........................................9
1
SCAA052A
Introduction
This application report discusses various jitter measurements of TI’s CDCV304 clock driver. The
CDCV304 is a 1:4 low-skew, low-jitter, single-ended LVTTL clock driver. The CDCV304 is
characterized for industrial temperature (-40°C to 85°C) and has a maximum operating
frequency of 140 MHz. The four output signals are low-skew, low-jitter copies of the input clock.
These properties make the CDCV304 ideal for various datacom and telecom applications
Jitter Performance of CDCV304 (Driven by HP8133A Signal Generator)
TI’s backplane transceivers require an input reference clock with maximum peak-to-peak jitter of
40 ps and of 40%–60% duty cycle. The worst-case output peak-to-peak jitter of the CDCV304
driver is less than 30 ps over a –40°C to 85°C range at nominal power supply. This
characteristic makes the CDCV304 an excellent choice to drive a backplane transceiver at the
specified clock frequency.
Point 1
Point 2
VDD = 3.3 V
HP8133A
(35 MHz to 140 MHz)
CDCV304
GND
Figure 1.
Indicates Various Jitter Measurement Points
Jitter measurements were taken at point 1 (output jitter of the signal generator and input jitter to
the CDCV304 clock driver) and point 2 (output jitter of the HP8133A+CDCV304 combination and
input jitter to the backplane transceiver). See Figures 2, 3, and 4 for results.
2
Using TI’s CDCV304 with Backplane Transceiver
(TLK1201, TLK1501, TLK2201, TLK2501, TLK2701 and TLK3101)
SCAA052A
Jitter vs Frequency
(3.3 V, Room Temp, VIH = 2.0 V and VIL = 0.8 V)
50
Jitter, ps
40
30
P-P
20
RMS
10
0
20
40
60
80
100
120
140
Frequency, MHz
Figure 2.
Peak-to-Peak and RMS Jitter of HP Signal Generator (Point 1)
Jitter vs Frequency
(3.3 V, Room Temp, VIH = 2.0 V and VIL = 0.8 V)
50
Jitter, ps
40
30
P-P
20
RMS
10
0
20
40
60
80
100
120
140
Frequency, MHz
Figure 3.
Peak-to-Peak and RMS Jitter of CDCV304 Driver Output (Point 2)
Using TI’s CDCV304 with Backplane Transceiver
(TLK1201, TLK1501, TLK2201, TLK2501, TLK2701 and TLK3101)
3
SCAA052A
Peak-Peak Jitter, ps
Peak-Peak Jitter vs Frequency
(3.3 V, VIH = 2.0 V and VIL = 0.8 V)
50
40
-40C
30
55C
20
85C
10
0
25
50
75
100
125
150
Frequency, MHz
Figure 4. Peak-to-Peak Jitter of CDCV304 Driver Output
(Point 2 Over Industrial Temperature Range)
Figure 4 shows that temperature has negligible impact on jitter performance of the CDCV304
clock driver.
Test Equipment Setup for Driving Backplane Transceiver
Point 1
Point 3
Point 2
VDD = 2.5 V
VDD = 3.3 V
HP8133A
(35 MHz to 140 MHz)
CDCV304
TLK1201/
TLK1501/
TLK2501/
TLK3101
Data Out
GND
GND
Figure 5.
Test Equipment Setup
In this setup, the CDCV304 is used to provide the input clock for TI’s backplane transceiver. The
main objective of performing this experiment is to observe how TI’s backplane transceiver
performs when driven by the CDCV304 clock driver.
4
Using TI’s CDCV304 with Backplane Transceiver
(TLK1201, TLK1501, TLK2201, TLK2501, TLK2701 and TLK3101)
SCAA052A
Recommended Termination for CDCV304 Clock Driver
Figure 6.
Series Termination for CDCV304 Clock Driver
Usually the value of the characteristic impedance (Z0) lies between 50 Ω and 70 Ω.
Typical impedance for this LVCMOS output is 20 Ω.
Series termination (with a 30-Ω resistor) is recommended to terminate the driver outputs.
This clock driver can drive a 10-pF capacitive load. Because the input load of TI’s backplane
receiver is only 4 pF, the CDCV304 is capable of driving multiple loads of the backplane
transceivers.
Test Summary
The following graphs (Figures 7, 8, 9, and 10) illustrate the worst case peak-to-peak and RMS
jitter measurements taken at various points as indicated in Figure 5. Point 1 is the output jitter of
the corresponding HP8133A frequencies. Point 2 is the output jitter of the CDCV304 when
driven by the HP clock source. Point 3 is the output jitter at the end of the chain, where the
transceiver is driven by the CDCV304 clock driver.
Using TI’s CDCV304 with Backplane Transceiver
(TLK1201, TLK1501, TLK2201, TLK2501, TLK2701 and TLK3101)
5
SCAA052A
Jitter Performance of CDCV304 + TLK1201 Combination
Jitter Comparison at Different Stages
(Nominal Supply and Room Temperature)
P-P
H
M
0
13
M
H
z
13
0
@
C
H
P
@
C
D
z+
C
D
C
0
13
@
w
/o
H
M
V3
04
+T
LK
12
01
z+
C
13
@
P
P
TL
K1
20
1
D
C
V3
04
z
0
M
H
M
H
z
60
@
C
C
D
H
H
M
H
z+
60
@
H
P
w
/o
C
D
C
V3
04
z+
C
H
M
60
@
P
H
6
TL
K1
20
1
on
z
H
M
60
@
P
H
Figure 7.
+T
LK
12
01
D
C
V3
04
RMS
ly
Jitter, ps
50
45
40
35
30
25
20
15
10
5
0
Jitter Values at Different Points Shown in Figure 5 With TLK1201
Using TI’s CDCV304 with Backplane Transceiver
(TLK1201, TLK1501, TLK2201, TLK2501, TLK2701 and TLK3101)
SCAA052A
Jitter Performance of CDCV304 + TLK1501 Combination
Jitter Comparison at Different Stages
(Nominal Supply and Room Temperature)
P-P
V3
M
H
80
TL
K1
50
1
H
M
80
P
@
w
/o
C
z+
C
D
80
@
P
H
@
04
z+
C
D
C
M
H
C
D
C
H
M
80
@
P
H
z
+T
LK
15
01
V3
04
z
z
M
H
35
C
D
C
w
/o
TL
K1
50
1
H
H
P
@
35
M
H
P
H
@
z+
C
D
35
C
V3
M
H
04
z+
C
D
C
on
z
H
M
35
@
P
H
Figure 8.
@
V3
04
+T
LK
15
01
RMS
ly
Jitter, ps
50
45
40
35
30
25
20
15
10
5
0
Jitter Values at Different Points Shown in Figure 5 With TLK1501
Using TI’s CDCV304 with Backplane Transceiver
(TLK1201, TLK1501, TLK2201, TLK2501, TLK2701 and TLK3101)
7
SCAA052A
Jitter Performance of CDCV304 + TLK2501 Combination
Jitter Comparison at Different Stages
(Nominal Supply and Room Temperature)
P-P
z+
C
D
C
V3
04
z
H
M
H
80
80
z+
C
D
C
M
@
P
H
P
@
80
H
P
M
H
@
H
Figure 9.
8
V3
04
+T
LK
H
P
25
@
01
80
M
H
z+
TL
K2
50
H
P
1
@
12
5
M
H
H
P
z
@
O
nl
12
H
y
P
5
M
@
H
12
z+
5
C
M
D
C
H
V3
z+
C
04
D
C
V3
04
+T
H
P
LK
@
25
12
01
5
M
H
z+
TL
K2
50
1
RMS
O
nl
y
Jitter, ps
50
45
40
35
30
25
20
15
10
5
0
Jitter Values at Different Points Shown in Figure 5 With TLK2501
Using TI’s CDCV304 with Backplane Transceiver
(TLK1201, TLK1501, TLK2201, TLK2501, TLK2701 and TLK3101)
SCAA052A
Jitter Performance of CDCV304 + TLK3101 Combination
Jitter Comparison at Different Stages
(Nominal Supply and Room Temperature)
P-P
M
H
z
14
0
@
TL
K3
10
1
H
M
0
14
H
P
@
w
/o
z+
C
D
C
0
14
@
P
C
H
M
C
D
z+
C
H
M
0
14
@
V3
04
+T
LK
31
01
D
C
V3
04
nl
y
z
O
M
H
z
12
5
@
C
H
P
H
H
M
5
12
H
P
@
C
D
z+
C
D
C
5
12
@
P
w
/o
D
z+
C
H
M
V3
04
+T
LK
31
01
V3
C
O
z
M
H
12
5
@
H
P
H
TL
K3
10
1
04
RMS
nl
y
Jitter, ps
50
45
40
35
30
25
20
15
10
5
0
Figure 10. Jitter Values at Different Points Shown in Figure 5 With TLK3101
Conclusion
The graphs above show that the CDCV304 adds less than 20 ps of peak-to-peak jitter to its
buffered outputs. The clock output jitter is less than 40 ps, which is the maximum jitter tolerance
of the clock input of the aforementioned backplane transceivers, over the data-sheet-specified
frequency and temperature range. Consequently, the CDCV304 clock driver satisfies all
specified requirements for the input clock and can be used to drive any of these backplane
transceivers.
Table 1.
Recommended Clock Drivers for Serial / Gigabit Transceivers
Serial / Gigabit Transceiver
SLK2501
Recommended CDC Clock Drivers
CDCVF111 up to 622.08 MHz
CDC111 up to 500 MHz
TLK3104A
CDC111 and CDCVF111
TLK3104SC
CDCVF111 up to 622.08 MHz
CDC111 up to 500 MHz
TLK1201, TLK1501, TLK2201, TNETE2201B, TLK2501,
TLK2701, TLK2711, TLK3101
CDCV304 up to 140 MHz
TLK3114SA
CDC111/CDCVF111
Using TI’s CDCV304 with Backplane Transceiver
(TLK1201, TLK1501, TLK2201, TLK2501, TLK2701 and TLK3101)
9
SCAA052A
References
1. CDCV304 140-MHz PCI-X Clock Buffer data sheet, Texas Instruments, 2000 (SCAS643)
2. Clock Distribution Circuits (CDC) Data Book, Texas Instruments, 1999 (SCAD004)
3. TLK1201RCP, TLK1201IRCP Ethernet Transceivers data sheet, Texas Instruments, 2001
(SLLS506)
4. TLK1501 0.6 to 1.5 Gbps Transceiver data sheet, Texas Instruments, 2001 (SLLS428)
5. TLK2201, TLK2201I Ethernet Transceivers data sheet, Texas Instruments, 2001 (SLLS420)
6. TLK2501 1.5 to 2.5 Gbps Transceiver data sheet, Texas Instruments, 2001 (SLLS427)
7. TLK2701 1.6 to 2.7 Gbps Transceiver data sheet, Texas Instruments, 2000 (SLLS429)
8. TLK2711 1.6 to 2.7 Gbps Transceiver data sheet, Texas Instruments, 2001 (SLLS501)
9. TLK3101 2.5 Gbps to 3.125 Gbps Transceiver data sheet, Texas Instruments, 2001
(SCAS649)
10
Using TI’s CDCV304 with Backplane Transceiver
(TLK1201, TLK1501, TLK2201, TLK2501, TLK2701 and TLK3101)
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third-party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
Products
Applications
Amplifiers
amplifier.ti.com
Audio
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DSP
dsp.ti.com
Broadband
www.ti.com/broadband
Interface
interface.ti.com
Digital Control
www.ti.com/digitalcontrol
Logic
logic.ti.com
Military
www.ti.com/military
Power Mgmt
power.ti.com
Optical Networking
www.ti.com/opticalnetwork
Microcontrollers
microcontroller.ti.com
Security
www.ti.com/security
Mailing Address:
Telephony
www.ti.com/telephony
Video & Imaging
www.ti.com/video
Wireless
www.ti.com/wireless
Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright  2006, Texas Instruments Incorporated
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising