SN65LVCP402RGETG4 [TI]

Gigabit 2x2 CROSSPOINT SWITCH; 千兆的2x2交叉点开关
SN65LVCP402RGETG4
型号: SN65LVCP402RGETG4
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

Gigabit 2x2 CROSSPOINT SWITCH
千兆的2x2交叉点开关

复用器 开关 复用器或开关 信号电路 输出元件
文件: 总20页 (文件大小:1457K)
中文:  中文翻译
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SN65LVCP402  
www.ti.com ....................................................................................................................................................... SLLS699AJUNE 2007REVISED JANUARY 2009  
Gigabit 2x2 CROSSPOINT SWITCH  
1
FEATURES  
DESCRIPTION  
Up to 4.25 Gbps Operation  
Non-blocking Architecture Allows Each  
Output to be Connected to Any Input  
The SN65LVCP402 is a 2x2 non-blocking crosspoint  
switch in a flow-through pin-out allowing for ease in  
PCB layout. VML signaling is used to achieve a  
high-speed data throughput while using low power.  
Each of the output drivers includes a 2:1 multiplexer  
to allow any input to be routed to any output. Internal  
signal paths are fully differential to achieve the high  
signaling speeds while maintaining low signal skews.  
The SN65LVCP402 incorporates 100-termination  
resistors for those applications where board space is  
30 ps of Deterministic Jitter  
Selectable Transmit Pre-Emphasis Per Lane  
Receive Equalization  
Available Packaging 24 Pin QFN  
Propagation Delay Times: 500 ps Typical  
Inputs Electrically Compatible With  
CML Signal Levels  
a
premium. Built-in transmit pre-emphasis and  
receive equalization for superior signal integrity  
performance.  
Operates From a Single 3.3-V Supply  
Ability to 3-STATE Outputs  
The SN65LVCP402 is characterized for operation  
from -40°C to 85°C.  
Low Power: 290 mW (typ)  
Integrated Termination Resistors  
APPLICATIONS  
Clock Buffering/Clock MUXing  
Wireless Base Stations  
High-Speed Network Routing  
Telecom/Datacom  
XAUI 802.3ae Protocol Backplane Redundancy  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2007–2009, Texas Instruments Incorporated  
SN65LVCP402  
SLLS699AJUNE 2007REVISED JANUARY 2009....................................................................................................................................................... www.ti.com  
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam  
during storage or handling to prevent electrostatic damage to the MOS gates.  
LOGIC DIAGRAM  
EQ  
TERMINAL FUNCTIONS  
TERMINAL  
TYPE  
DESCRIPTION  
NAME  
NO.  
High Speed I/O  
Differential Inputs (with 50-  
xA  
xB  
2, 5  
3, 6  
termination to VBB  
xA=P; xB=N  
)
Line Side Differential Inputs CML compatible  
Switch Side Differential Outputs. VML  
xY  
xZ  
17, 14  
16, 13  
Differential Output xY=P; xZ=N  
Input  
Control Signals  
Data Enable; Active Low; LVTTL; When not enabled the output  
is in 3-STATE mode for power savings  
xDE  
24, 7  
S1, S2  
1, 18  
Input; S1 = Channel 1  
Switching Selection; LVTTL  
P11-P22  
22, 21, 9, 10  
Input; P11- Channel 1 bit one  
Output Preemphasis Control; LVTTL  
Input: Selection for Receive  
Equalization Setting  
EQ=1 (default) is for the 5 dB setting; EQ=0 is for the 12 dB  
setting  
EQ  
23  
Power Supply  
VCC  
8, 12, 19  
Power  
Input  
Power Supply 3.3 V ±5%  
GND  
11, 15, 20  
The ground center pad of the package must be connected to  
GND plane with thermal vias.  
Thermal Pad  
VBB  
Thermal Pad  
4
Receiver input biasing voltage. For ac coupling, VBB should be  
left floating for optimal bias value. For dc coupling, VBB can  
driven to change the common mode. VBB should not be tied to  
ground.  
2
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SN65LVCP402  
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EQUIVALENT INPUT AND OUTPUT SCHEMATIC DIAGRAMS  
VCC  
IN+  
R
T(SE)  
= 50 W  
Gain  
Stage  
+ EQ  
VCC  
RBBDC  
VBB  
R
T(SE)  
= 50 W  
IN−  
LineEndTermination  
ESD Self−Biasing Network  
Figure 1. Equivalent Input Circuit Design  
49.9 W  
49.9 W  
OUT+  
OUT−  
V
OCM  
1 pF  
Figure 2. Common-Mode Output Voltage Test Circuit  
Table 1. CROSSPOINT LOGIC TABLES  
OUTPUT CHANNEL 1 (1Y/1Z)  
OUTPUT CHANNEL 2 (2Y/2Z)  
CONTROL  
INPUT  
CONTROL  
INPUT  
PINS  
S1  
0
SELECTED  
PINS  
S2  
0
SELECTED  
1A/1B  
2A/2B  
1A/1B  
2A/2B  
1
1
AVAILABLE OPTIONS  
PACKAGED DEVICE(1)(2)  
RGE (24 pin)  
TA  
-40°C to 85°C  
DESCRIPTION  
Serial multiplexer  
SN65LVCP402  
(1) The package is available taped and reeled. Add an R suffix to device types (e.g., SN65LVCP402RGER).  
(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI  
website at www.ti.com.  
Copyright © 2007–2009, Texas Instruments Incorporated  
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SN65LVCP402  
SLLS699AJUNE 2007REVISED JANUARY 2009....................................................................................................................................................... www.ti.com  
DISSIPATION RATINGS  
PACKAGE THERMAL CHARACTERISTICS(1)  
Parameter  
Conditions  
NOM  
θJA (junction-to-ambient) #1  
4-layer JEDEC Board (JESD51-7), Airflow = 0 ft/min  
106.6 C/W  
4-layer JEDEC Board (JESD51-7) using 4 Thermal-vias of 22-mil diameter  
each, Airflow = 0 ft/min  
θJA (junction-to-ambient) #2  
55.4 C/W  
(1) See application note SPRA953 for a detailed explanation of thermal parameters (http://www-s.ti.com/sc/psheets/spra953/spra953.pdf).  
ABSOLUTE MAXIMUM RATINGS  
over operating free-air temperature range (unless otherwise noted)(1)  
UNIT  
VCC  
VI  
Supply voltage range(2)  
Voltage range  
–0.5 V to 6 V  
–0.5 V to (VCC + 0.5 V)  
–0.5 V to 4 V  
4 kV  
Control inputs, all outputs  
Receiver inputs  
All pins  
Human Body Model(3)  
Charged-Device Model(4)  
ESD  
All pins  
500 V  
See Package Thermal Characteristics  
Table  
TJ  
Maximum junction temperature  
Moisture sensitivity level  
2
Reflow temperature package soldering, 4 seconds  
260°C  
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings  
only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating  
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.  
(2) All voltage values, except differential I/O bus voltages, are with respect to network ground terminal.  
(3) Tested in accordance with JEDEC Standard 22, Test Method A114-A.  
(4) Tested in accordance with JEDEC Standard 22, Test Method C101.  
4
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www.ti.com ....................................................................................................................................................... SLLS699AJUNE 2007REVISED JANUARY 2009  
RECOMMENDED OPERATING CONDITIONS  
MIN  
NOM  
MAX  
4.25  
3.465  
20  
UNIT  
Gbps  
V
dR  
Operating data rate  
VCC  
VCC(N)  
TJ  
Supply voltage  
3.135  
3.3  
Supply voltage noise amplitude  
Junction temperature  
10 Hz to 2 GHz  
mV  
°C  
125  
85  
TA  
Operating free-air temperature(1)  
-40  
°C  
DIFFERENTIAL INPUTS  
dR(in) 1.25 Gbps  
100  
100  
100  
1750  
1560  
1000  
mVPP  
mVPP  
mVPP  
Receiver peak-to-peak differential input  
VID  
1.25 Gbps < dR(in) 3.125 Gbps  
dR(in) > 3.125 Gbps  
voltage(2)  
|V  
*
|
ID  
Receiver common-mode  
input voltage  
Note: for best jitter performance ac  
coupling is recommended.  
V
CC  
VICM  
1.5  
1.6  
V
2
CONTROL INPUTS  
VIH  
VIL  
High-level input voltage  
Low-level input voltage  
2
VCC + 0.3  
0.8  
V
V
–0.3  
DIFFERENTIAL OUTPUTS  
RL Differential load resistance  
80  
100  
120  
(1) Maximum free-air temperature operation is allowed as long as the device maximum junction temperature is not exceeded.  
(2) Differential input voltage VID is defined as | IN+ – IN– |.  
ELECTRICAL CHARACTERISTICS  
over operating free-air temperature range (unless otherwise noted)  
PARAMETER  
TEST CONDITIONS  
MIN  
TYP(1)  
MAX  
UNIT  
DIFFERENTIAL INPUTS  
Positive going differential  
input high threshold  
VIT+  
50  
mV  
Negative going differential  
input low threshold  
VIT–  
–50  
80  
mV  
dB  
A(EQ)  
RT(D)  
Equalizer gain  
at 1.875 GHz (EQ=0)  
12  
Termination resistance,  
differential  
100  
120  
Open-circuit Input voltage  
(input self-bias voltage)  
VBB  
AC-coupled inputs  
1.6  
30  
V
Biasing network dc  
impedance  
R(BBDC)  
kΩ  
375 MHz  
42  
Biasing network ac  
impedance  
R(BBAC)  
1.875 GHz  
8.4  
DIFFERENTIAL OUTPUTS  
VODH  
VODL  
High-level output voltage  
RL = 100 ±1%,  
650  
mVPP  
mVPP  
PRES_1 = PRES_0=0;  
PREL_1 = PREL_0=0; 4 Gbps alternating  
1010-pattern;  
Low-level output voltage  
–650  
Output differential voltage  
without preemphasis(2)  
VODB(PP)  
VOCM  
1000  
1300  
1.65  
1500  
mVPP  
V
Figure 3  
Output common mode voltage  
Change in steady-state  
See Figure 2  
ΔVOC(SS) common-mode output voltage  
1
mV  
between logic states  
(1) All typical values are at TA = 25°C and VCC = 3.3 V supply unless otherwise noted. They are for reference purposes and are not  
production tested.  
(2) Differential output voltage V(ODB) is defined as | OUT+ – OUT– |.  
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ELECTRICAL CHARACTERISTICS (continued)  
over operating free-air temperature range (unless otherwise noted)  
PARAMETER  
TEST CONDITIONS  
MIN  
TYP(1)  
MAX  
UNIT  
Output preemphasis voltage  
ratio,  
Px_2:Px_1 = 00  
0
3
6
Px_2:Px_1 = 01  
Px_2:Px_1 = 10  
RL = 100 ±1%;  
x = Channel 1 or 2;  
See Figure 3  
V(PE)  
dB  
V
ODB(PP)  
V
Px_2:Px_1= 11  
9
175  
100  
ODPE(PP)  
Output preemphasis is set to 9 dB during test  
PREx_x = 1;  
Measured with a 100-MHz clock signal;  
RL = 100 ±1%, See Figure 4  
Preemphasis duration  
measurement  
t(PRE)  
ps  
Differential on-chip termination between OUT+ and  
OUT–  
ro  
Output resistance  
CONTROL INPUTS  
IIH  
High-level Input current  
VIN = VCC  
VIN = GND  
5
µA  
µA  
kΩ  
IIL  
Low-level Input current  
Pullup resistance  
-125  
-90  
35  
R(PU)  
POWER CONSUMPTION  
PD  
Device power dissipation  
All outputs terminated 100 Ω  
290  
414  
331  
mW  
mW  
Device power dissipation in  
3-state  
PZ  
All outputs in 3-state  
All outputs  
terminated 100 Ω  
ICC  
Device current consumption  
PRBS 27-1 pattern at 4 Gbps  
115  
mA  
SWITCHING CHARACTERISTICS  
over operating free-air temperature range (unless otherwise noted)  
PARAMETER  
MULTIPLEXER  
t(SM) Multiplexer switch time  
DIFFERENTIAL OUTPUTS  
Low-to-high propagation  
TEST CONDITIONS  
MIN  
TYP(1)  
MAX UNIT  
Multiplexer to valid output  
3
6
ns  
tPLH  
0.5  
0.5  
0.7  
0.7  
ns  
ns  
delay  
Propagation delay input to output  
See Figure 6  
High-to-low propagation  
delay  
tPHL  
tr  
Rise time  
80  
80  
ps  
ps  
ps  
ps  
ps  
20% to 80% of VO(DB); Test Pattern: 100-MHz clock signal;  
See Figure 5 and Figure 8  
tf  
Fall time  
(2)  
tsk(p)  
tsk(o)  
tsk(pp)  
Pulse skew, | tPHL – tPLH  
Output skew(3)  
Part-to-part skew(4)  
|
20  
100  
300  
All outputs terminated with 100 Ω  
25  
3-State switch time to  
disable  
tzd  
tze  
Assumes 50 to Vcm and 150 pF load on each output  
Assumes 50 to Vcm and 150 pF load on each output  
20  
10  
ns  
ns  
3-State switch time to  
enable  
See Figure 8 for test circuit.  
BERT setting 10–15  
RJ  
Device random jitter, rms  
0.8  
2
ps-rms  
Alternating 10-pattern.  
(1) All typical values are at 25°C and with 3.3 V supply unless otherwise noted.  
(2) tsk(p) is the magnitude of the time difference between the tPLH and tPHL of any output of a single device.  
(3) tsk(o) is the magnitude of the time difference between the tPLH and tPHL of any two outputs of a single device.  
(4) tsk(pp) is the magnitude of the difference in propagation delay times between any specified terminals of two devices when both devices  
operate with the same supply voltages, at the same temperature, and have identical packages and test circuits.  
6
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SN65LVCP402  
www.ti.com ....................................................................................................................................................... SLLS699AJUNE 2007REVISED JANUARY 2009  
SWITCHING CHARACTERISTICS (continued)  
over operating free-air temperature range (unless otherwise noted)  
PARAMETER  
TEST CONDITIONS  
MIN  
TYP(1)  
MAX UNIT  
0 dB preemphasis  
Intrinsic deterministic device (PREx_x = 0);  
jitter (5)(6), peak-to-peak  
circuit.  
PRBS 27-1  
pattern  
4 Gbps  
30  
ps  
See Figure 8 for the test  
1.25 Gbps  
Over 20-inch  
FR4 trace  
7
DJ  
0 dB preemphasis  
(PREx_x = 0);  
Absolute deterministic  
PRBS 27-1  
pattern  
4 Gbps  
ps  
output jitter(7), peak-to-peak See Figure 8 for the test  
circuit.  
Over FR4  
trace 2-inch  
to 20 inches  
long  
20  
(5) Intrinsic deterministic device jitter is a measurement of the deterministic jitter contribution from the device. It is derived by the equation  
(DJ(OUT) – DJ(IN) ), where DJ(OUT) is the total peak-to-peak deterministic jitter measured at the output of the device in PSPP. DJ(IN) is the  
peak-to-peak deterministic jitter of the pattern generator driving the device.  
(6) The SN65LVCP402 built-in passive input equalizer compensates for ISI. For a 20-inch FR4 transmission line with 8-mil trace width, the  
LVCP402 typically reduces jitter by 60 ps from the device input to the device output.  
(7) Absolute deterministic output jitter reflects the deterministic jitter measured at the SN65LVCP402 output. The value is a real measured  
value with a Bit error tester as described in Figure 8. The absolute DJ reflects the sum of all deterministic jitter components accumulated  
over the link: DJ(absolute) = DJ(Signal generator) + DJ(transmission line) + DJ(intrinsic(LVCP402))  
.
Table 2. Preemphasis Controls Settings  
OUTPUT  
PREEMPHASIS  
LEVEL IN dB  
OUTPUT LEVEL IN mVPP  
TYPICAL FR4  
TRACE LENGTH  
Px_2(1)  
Px_1(1)  
DE-EMPHASIZED  
PRE-EMPHASIZED  
0
0
1
1
0
1
0
1
0 dB  
3 dB  
6 dB  
9 dB  
1200  
850  
600  
425  
1200  
1200  
1200  
1200  
10 inches of FR4 trace  
20 inches of FR4 trace  
30 inches of FR4 trace  
40 inches of FR4 trace  
(1) x = 1 or 2  
Table 2. Receive Equalization Settings  
EQ  
Equalization  
5 dB  
Typical Line Trace  
1
25 inches of FR4  
43 inches of FR4  
0
12 dB  
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PARAMETER MEASUREMENT INFORMATION  
1−bit  
1 to N bit  
0−dB Preemphasis  
3−dB Preemphasis  
6−dB Preemphasis  
V
V
OH  
9−dB Preemphasis  
V
OCM  
OL  
V
ODB(PP)  
Figure 3. Preemphasis and Output Voltage Waveforms and Definitions  
1−bit  
1 to N bit  
9−dB Preemphasis  
V
ODB(PP)  
80%  
20%  
tPRE  
Figure 4. t(PRE) Preemphasis Duration Measurement  
80%  
80%  
V
ODB  
20%  
20%  
t
t
f
r
Figure 5. Driver Output Transition Time  
8
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PARAMETER MEASUREMENT INFORMATION (continued)  
V
ID  
= 0 V  
IN  
t
t
PLHD  
PHLD  
V
OD  
= 0 V  
OUT  
Figure 6. Propagation Delay Input to Output  
V
A
0 V  
Clock Input  
0 V  
Ideal Output  
V
B
V
Y
− V  
Z
1/fo  
1/fo  
Period Jitter  
Cycle-to-Cycle Jitter  
Actual Output  
0 V  
Actual Output  
V
0 V  
− V  
V
Y
− V  
Z
Y
Z
t
t
t
c(n +1)  
c(n)  
c(n)  
t
= | t  
− t  
c(n + 1)  
|
t
= | t  
− 1/fo |  
jit(cc)  
c(n)  
jit(pp)  
c(n)  
Peak-to-Peak Jitter  
V
A
V
Y
PRBS Input  
0 V  
0 V  
PRBS Output  
V
B
V
Z
t
jit(pp)  
A. All input pulses are supplied by an Agilent 81250 Stimulus System.  
B. The measurement is made on a TEK TDS6604 running TDSJIT3 application software.  
Figure 7. Driver Jitter Measurement Waveforms  
DC  
DC  
Block  
Pre-amp  
Block  
Pattern  
Generator  
SMA  
SMA  
Coax  
Coax  
Coax  
Coax  
D+  
D−  
<2” 50 TL  
<2” 50 TL  
SMA  
SMA  
RX  
+
EQ  
M
U
X
OUT  
0 dB  
DC  
Block  
DC  
Block  
20−inch FR4  
Coupled  
Transmission line  
400 mV  
PP  
Differential  
SN65LVCP402  
Characterization Test Board  
Jitter Test  
Instrument  
Figure 8. AC Test Circuit — Jitter and Output Rise Time Test Circuit  
The SN65LVCP402 input equalizer provides 5-dB frequency gain to compensate for frequency loss of a shorter  
backplane transmission line. For characterization purposes, a 24-inch FR-4 coupled transmission line is used in  
place of the backplane trace. The 24-inch trace provides roughly 5 dB of attenuation between 375 MHz and  
1.875 GHz, representing closely the characteristics of a short backplane trace. The loss tangent of the FR4 in the  
test board is 0.018 with an effective ε(r) of 3.1.  
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TYPICAL DEVICE BEHAVIOR  
Eye After 51 inch FR-4 Trace, Input 800 mVPP  
Eye After 51 inch FR-4 Trace, Input 800 mVPP  
,
Through the 404 With Pre-emphasis at 3 dB  
100 ps/div  
Pre-emphasis Levels  
50 ps/div  
Figure 10. Preemphasis Signal Shape  
NOTE: 51 Inch (128.54 cm) Input Trace, dR = 4.25  
Gbps; 27- 1 PRBS  
Figure 9. Data Input and Output Pattern  
LVCP402  
35-inches,  
88.9 cm FR4  
4.25 Gbps  
Signal  
Generator  
51-inches,  
129.54 cm FR4  
7-1  
PRBS 2  
800 mV Input  
PP  
35-inches,  
88.9 cm FR4  
Figure 11. Data Output Pattern  
10  
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TYPICAL CHARACTERISTICS  
DETERMINISTIC OUTPUT JITTER  
DETERMINISTIC OUTPUT JITTER  
vs  
DIFFERENTIAL OUTPUT VOLTAGE  
vs  
vs  
DATA RATE  
DIFFERENTIAL INPUT AMPLITUDE  
14  
DATA RATE  
1.4  
50  
7-1  
2
PRBS pattern,  
45 A 22 inch FR-4 Trace 8-mil Wide is  
Driving th LVCP402.  
12  
10  
8
1.2  
1
4.25 Gbps  
40  
The DJ is Measured on the Output of the  
LVCP402  
3.75 Gbps  
3.125 Gbps  
35  
30  
0.8  
6
25  
20  
15  
10  
0.6  
4
0.4  
0.2  
0
2
0
2.5 Gbps  
5
0
1.25 Gbps  
1500  
1000  
-2  
0
500  
2000  
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
V
- Differential Input Amplitude - mV  
DR - Data Rate - Gbps  
ID  
DR - Data Rate - Gbps  
Figure 12.  
Figure 13.  
Figure 14.  
SUPPLY NOISE vs DETERMINISTIC  
JITTER  
vs  
DETERMINISTIC OUTPUT JITTER  
vs  
DATA RATE  
COMMON-MODE INPUT VOLTAGE  
14  
35  
Noise = 200 mV  
12  
10  
8
Noise = 650 mV  
Noise = 300 mV  
30  
25  
4.25 Gbps  
20  
Noise = 100 mV  
6
Noise = 50 mV  
15  
10  
Noise = 400 mV  
4
2
5
0
0
1
2.5  
3
0
0.5  
2
5
4
1.5  
- Common Mode Input Voltage - V  
0
3
1
2
V
DR – Data Rate – Gbps  
IC  
Figure 15.  
Figure 16.  
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SN65LVCP402  
SLLS699AJUNE 2007REVISED JANUARY 2009....................................................................................................................................................... www.ti.com  
APPLICATION INFORMATION  
BANDWIDTH REQUIREMENTS  
Error free transmission of data over a transmission line has specific bandwidth demands. It is helpful to analyze  
the frequency spectrum of the transmit data first. For an 8B10B coded data stream at 3.75 Gbps of random data,  
the highest bit transition density occurs with a 1010 pattern (1.875 GHz). The least transition density in 8B10B  
allows for five consecutive ones or zeros. Hence, the lowest frequency of interest is 1.875 GHz/5 = 375 MHz.  
Real data signals consist of higher frequency components than sine waves due to the fast rise time. The faster  
the rise time, the more bandwidth becomes required. For 80-ps rise time, the highest important frequency  
component is at least 0.6/(π × 80 ps) = 2.4 GHz. Figure 17shows the Fourier transformation of the 375-MHz and  
1.875-GHz trapezoidal signal.  
0
20 dB/dec  
1875 MHz With  
−5  
−10  
−15  
−20  
−25  
80 ps Rise Time  
20 dB/dec  
375 MHz With  
80 ps Rise Time  
40 dB/dec  
80%  
40 dB/dec  
20%  
t
r
t
= 1/f  
Period  
100  
1000  
f − Frequency − MHz  
10000  
1/(pi x 100/60 t ) = 2.4 GHz  
r
Figure 17. Approximate Frequency Spectrum of the Transmit Output Signal With 80 ps Rise Time  
The spectrum analysis of the data signal suggests building a backplane with little frequency attenuation up to  
2 GHz. Practically, this is achievable only with expensive, specialized PCB material. To support material like  
FR4, a compensation technique is necessary to compensate for backplane imperfections.  
EXPLANATION OF EQUALIZATION  
Backplane designs differ widely in size, layer stack-up, and connector placement. In addition, the performance is  
impacted by trace architecture (trace width, coupling method) and isolation from adjacent signals. Common to  
most commercial backplanes is the use of FR4 as board material and its related high-frequency signal  
attenuation. Within a backplane, the shortest to longest trace lengths differ substantially – often ranging from  
8 inches up to 40 inches. Increased loss is associated with longer signal traces. In addition, the backplane  
connector often contributes a good amount of signal attenuation. As a result, the frequency signal attenuation for  
a 300-MHz signal might range from 1 dB to 4 dB while the corresponding attenuation for a 2-GHz signal might  
span 6 dB to 24 dB. This frequency dependent loss causes distortion jitter on the transmitted signal. Each  
LVCP402 receiver input incorporates an equalizer and compensates for such frequency loss. The  
SN65LVCP402 equalizer provides 5/12 dB of frequency gain between 375 MHz and 1.875 GHz, compensating  
roughly for 20 inches of FR4 material with 8-mil trace width. Distortion jitter improvement is substantial, often  
providing more than 30-ps jitter reduction. The 5-dB compensation is sufficient for most short backplane traces.  
For longer trace lengths, it is recommended to enable transmit preemphasis in addition.  
12  
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Copyright © 2007–2009, Texas Instruments Incorporated  
Product Folder Link(s): SN65LVCP402  
 
SN65LVCP402  
www.ti.com ....................................................................................................................................................... SLLS699AJUNE 2007REVISED JANUARY 2009  
SETTING THE PREEMPHASIS LEVEL  
The receive equalization compensates for ISI. This reduces jitter and opens the data eye. In order to find the  
best preemphasis setting for each link, calibration of every link is recommended. Assuming each link consists of  
a transmitter (with adjustable pre-emphasis such as LVCP402) and the LVCP402 receiver, the following steps  
are necessary:  
1. Set the transmitter and receiver to 0-dB preemphasis; record the data eye on the LVCP402 receiver output.  
2. Increase the transmitter preemphasis until the data eye on the LVCP402 receiver output looks the cleanest.  
Copyright © 2007–2009, Texas Instruments Incorporated  
Submit Documentation Feedback  
13  
Product Folder Link(s): SN65LVCP402  
PACKAGE OPTION ADDENDUM  
www.ti.com  
26-Jan-2009  
PACKAGING INFORMATION  
Orderable Device  
SN65LVCP402RGER  
SN65LVCP402RGERG4  
SN65LVCP402RGET  
SN65LVCP402RGETG4  
Status (1)  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
Package Package  
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)  
Qty  
Type  
Drawing  
VQFN  
RGE  
24  
24  
24  
24  
3000 Green (RoHS & CU NIPDAU Level-3-260C-168 HR  
no Sb/Br)  
VQFN  
VQFN  
VQFN  
RGE  
RGE  
RGE  
3000 Green (RoHS & CU NIPDAU Level-3-260C-168 HR  
no Sb/Br)  
250 Green (RoHS & CU NIPDAU Level-3-260C-168 HR  
no Sb/Br)  
250 Green (RoHS & CU NIPDAU Level-3-260C-168 HR  
no Sb/Br)  
(1) The marketing status values are defined as follows:  
ACTIVE: Product device recommended for new designs.  
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.  
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in  
a new design.  
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.  
OBSOLETE: TI has discontinued the production of the device.  
(2)  
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check  
http://www.ti.com/productcontent for the latest availability information and additional product content details.  
TBD: The Pb-Free/Green conversion plan has not been defined.  
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements  
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered  
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.  
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and  
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS  
compatible) as defined above.  
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame  
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)  
(3)  
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder  
temperature.  
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accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take  
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incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited  
information may not be available for release.  
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI  
to Customer on an annual basis.  
Addendum-Page 1  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
14-Jul-2012  
TAPE AND REEL INFORMATION  
*All dimensions are nominal  
Device  
Package Package Pins  
Type Drawing  
SPQ  
Reel  
Reel  
A0  
B0  
K0  
P1  
W
Pin1  
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant  
(mm) W1 (mm)  
SN65LVCP402RGER  
SN65LVCP402RGET  
VQFN  
VQFN  
RGE  
RGE  
24  
24  
3000  
250  
330.0  
180.0  
12.4  
12.4  
4.25  
4.25  
4.25  
4.25  
1.15  
1.15  
8.0  
8.0  
12.0  
12.0  
Q2  
Q2  
Pack Materials-Page 1  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
14-Jul-2012  
*All dimensions are nominal  
Device  
Package Type Package Drawing Pins  
SPQ  
Length (mm) Width (mm) Height (mm)  
SN65LVCP402RGER  
SN65LVCP402RGET  
VQFN  
VQFN  
RGE  
RGE  
24  
24  
3000  
250  
367.0  
210.0  
367.0  
185.0  
35.0  
35.0  
Pack Materials-Page 2  
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