June 1998
CLC014
Adaptive Cable Equalizer for High-Speed Data Recovery
General Description
National's CLC014 adaptive cable equalizer is a low-cost monolithic solution for equalizing data transmitted over cable (or any media with similar dispersive loss characteristics). The CLC014 simplifies the task of high-speed data recovery with a one-chip solution and a minimal number of external components. The equalizer automatically adapts to equalize any cable length from zero meters to lengths that attenuate the signal by 40 dB at 200 MHz. This corresponds to 300 meters of Belden 8281 or 120 meters of Category 5 UTP (unshielded twisted pair).
The CLC014 provides superior jitter performance: 180pspp for 270 Mbps data that has passed through 200 meters of Belden 8281 cable. This exceptional performance provides wide error margin in digital data links.
The equalizer operates on a single supply with a power consumption of only 290 mW. The small 14-pin SOIC package allows for high-density placement of components for multichannel applications such as routers. The equalizer operates over a wide range of data rates from less than 50 Mbps to rates in excess of 650 Mbps.
The equalizer is flexible in allowing either single-ended or differential input drive. Its high common mode rejection provides excellent immunity to interference from noise sources. On-chip quantized feedback eliminates baseline wander.
Additional features include a carrier detect output and an output mute pin which, when tied together, mute the output when no signal is present. A buffered eye monitor output is provided, for viewing the equalized signal prior to the comparator. Differential AEC pins allow the user to set the inter-
nal adaptive loop time constant with one external capacitor. Also, the CLC014 is insensitive to the pathological patterns inherent in the video industry standards.
Features
nAutomatic equalization of coaxial and twisted pair cables
nCarrier detection and output mute
nOutput eye monitor
nSingle supply operation: +5V or −5.2V
nSingle-ended or differential input
nLow cost
Applications
nSMPTE 259M serial digital interfaces: NTSC/PAL, 4:2:2 component and wide screen; also 540 Mbps (4:4:4:4)
nSerial digital video routing and distribution
nSerial digital data equalization and reception
nData recovery equalization: ATM, CAD networks, medical, set top terminals, industrial video networks
Key Specifications
nLow jitter: 180pspp @ 270 Mbps through 200 meters of Belden 8281 coaxial cable
nHigh data rates: < 50 Mbps to > 650 Mbps
nExcellent input return loss: 19 dB @ 270 MHz
nLow supply current: 58 mA
nEqualizes up to 300+ meters of Belden 8281 or 120 meters of Cat 5 UTP cable
Typical Application
DS100056-4
Recovery Data Speed-High for Equalizer Cable Adaptive CLC014
© 1999 National Semiconductor Corporation |
DS100056 |
www.national.com |
Typical Application (Continued)
Before Equalization |
After Equalization |
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Vertical scale: 200mV/div |
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Vertical scale: 200mV/div |
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270Mbps data through 300m |
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270Mbps data through 300m |
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of Belden 8281 coax cable |
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of Belden 8281 coax cable |
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DS100056-2 |
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DS100056-3
Connection Diagram
Pinout SOIC
DS100056-1
14-Pin SOIC
Order Number CLC014AJE
See NS Package Number M14A
www.national.com |
2 |
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Supply Voltage (VCC±VEE) |
−0.3V, +6.5V |
Maximum Junction Temperature |
+150ÊC |
Storage Temperature Range |
−65ÊC to +150ÊC |
Lead Temperature |
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(Soldering 4 sec.) |
+260ÊC |
ESD Rating (Note 14) |
<500V |
θJA 14-Pin SOIC (AJE) |
95ÊC/W |
MTTF (based on limited life test data) |
4.8 x 107 hours |
Recommended Operating
Conditions
Supply Voltage (VCC±VEE) |
4.5V to 5.5V |
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Operating Temperature Range |
−40ÊC to +85ÊC |
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Series Input Resistance |
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100Ω |
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DI) |
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Input Coupling Capacitance |
0.1 µF |
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AEC Capacitor (Connected |
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between AEC+ & AEC−) |
50 pF to 1 µF |
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Cable Input Voltage Swing |
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(Note 4) |
720 to 880 mVpp |
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DO/DO |
Minimum Voltage |
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(Note 15) |
VCC±1.6V |
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Electrical Characteristics
(VCC = +5V, VEE = 0V, signal source swing = 0.8 Vpp(Note 4), CAEC = 100 pF)
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Typ |
Min/Max |
Min/Max |
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Parameter |
Conditions |
−40ÊC to |
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+25ÊC |
+25ÊC |
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+85ÊC |
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DYNAMIC PERFORMANCE |
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Residual Jitter |
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100 meters Belden 8281 |
270 Mbps PRN (Note 5) |
150 |
250 |
400 |
pspp |
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200 meters Belden 8281 |
270 Mbps PRN (Note 5) |
180 |
250 |
400 |
pspp |
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300 meters Belden 8281 |
270 Mbps PRN (Notes 3, 5) |
350 |
500 |
750 |
pspp |
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Equalization Time Constant |
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100 meters Belden 8281 |
CAEC = 100 pF (Note 6) |
1.5 |
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µs |
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200 meters Belden 8281 |
CAEC = 100 pF (Note 6) |
2.0 |
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µs |
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300 meters Belden 8281 |
CAEC = 100 pF (Note 6) |
3.2 |
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µs |
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output rise and fall time (20%±80%) |
Rcollector = 75Ω |
750 |
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output duty cycle distortion |
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30 |
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ps |
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minimum average transition density |
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1/50 |
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trans/ns |
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maximum average data rate |
150m Belden 8281 (Note 7) |
650 |
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Mbps |
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VCC Jitter Sensitivity |
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27 MHz |
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0.85 |
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270 MHz |
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1.90 |
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VEE Jitter Sensitivity |
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27 MHz |
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0.55 |
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270 MHz |
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1.45 |
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ns/V |
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STATIC PERFORMANCE |
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Supply Current (Includes Output Current) |
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VAEC = 0V |
(Note 3) |
58 |
48/68 |
40/75 |
mA |
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VAEC = 0.4V |
(Note 3) |
53 |
43/64 |
37/70 |
mA |
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Input and Output Parameters |
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DO/DO |
output current |
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8.7/11.3 |
8.0/12 |
mA |
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Rcollector = 75Ω (Note 3) |
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DO/DO |
output voltage swing |
750 |
650/850 |
600/900 |
mV |
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3.4 |
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DI/DI |
common mode voltage |
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AEC differential voltage |
Belden 8281 |
1.5 |
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mV/meter |
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AEC+/AEC− common mode |
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3.6 |
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V |
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output eye monitor (OEM) bias potential |
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3.2 |
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V |
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carrier detect (CD) current output-HIGH |
CD VOH = 4.5V |
−400 |
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carrier detect (CD) current output-LOW |
CD VOL = 0.5V |
600 |
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µA |
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(Note 3) |
1.8 |
2.0 |
2.0 |
V |
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MUTE |
voltage input-HIGH |
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(Note 3) |
1.2 |
0.8 |
0.8 |
V |
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MUTE |
voltage input-LOW |
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3 |
www.national.com |
Electrical Characteristics (Continued)
(VCC = +5V, VEE = 0V, signal source swing = 0.8 Vpp(Note 4), CAEC = 100 pF)
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Typ |
Min/Max |
Min/Max |
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Parameter |
Conditions |
−40ÊC to |
Units |
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+25ÊC |
+25ÊC |
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+85ÊC |
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Input and Output Parameters |
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MUTE |
current input-HIGH |
VIH = 5V (Note 3) |
5.0 |
±100 |
±500 |
nA |
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VIL = 0V (Note 3) |
0.2 |
±100 |
±500 |
nA |
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MUTE |
current input-LOW |
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TIMING PERFORMANCE |
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CD Response Time |
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carrier applied |
(Note 8) |
1.0 |
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µs |
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carrier removed |
(Note 9) |
12 |
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(Note 10) |
2.0 |
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MUTE |
response time |
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MISCELLANEOUS PERFORMANCE |
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input resistance |
single-ended |
7.3 |
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kΩ |
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input capacitance |
single-ended (Note 11) |
1.0 |
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pF |
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input return loss @ 270 MHz |
Zo = 75Ω (Note 12) |
19 |
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maximum cable attenuation |
200 MHz (Note 13) |
40 |
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Note 1: ªAbsolute Maximum Ratingsº are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The table of ªElectrical Characteristicsº specifies conditions of device operation.
Note 2: Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined from tested parameters.
Note 3: J-level: spec. is 100% tested at +25ÊC.
Note 4: These specifications assume an 800 mVpp signal at the cable input. Levels above and below 800 mV are allowable, but performance may vary. The cable will attenuate the signal prior to entering the equalizer.
Note 5: Peak-to-peak jitter is defined as 6 times the rms jitter.
Note 6: For more information, see ªCLC014 Operationº and ªDesign Guidelinesº.
Note 7: 50% eye opening.
Note 8: Time from application of a valid signal to when the CD output asserts high.
Note 9: Time from the removal of a valid signal to when the CD output asserts low.
Note 10: Time from assertion of MUTE to when the output responds.
Note 11: Device only. Does not include typical pc board parasitics.
Note 12: Includes typical pc board parasitics.
Note 13: This sets the maximum cable length for the equalizer.
Note 14: Human body model, 1.5 kΩ in series with 100 pF; based on limited test data.
Note 15: To maintain specified performance, do not reduce DO/DO below this level.
www.national.com |
4 |
Typical Performance Characteristics
Before Equalization:
100m of Belden 8281 Coaxial Cable
(200mV/div)Input
Equalizer Data Rate: 270Mbps
Time (1ns/div)
DS100056-5
Before Equalization:
200m of Belden 8281 Coaxial Cable
(200mV/div)Input
Equalizer Data Rate: 270Mbps
Time (1ns/div)
DS100056-6
Before Equalization:
300m of Belden 8281 Coaxial Cable
(200mV/div)Input
Equalizer Data Rate: 270Mbps
Time (1ns/div)
DS100056-7
After Equalization:
100m of Belden 8281 Coaxial Cable
Equalizer Output (200mV/div) |
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Data Rate: 270Mbps |
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Time (1ns/div)
DS100056-8
After Equalization:
200m of Belden 8281 Coaxial Cable
Equalizer Output (200mV/div) |
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Data Rate: 270Mbps |
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Time (1ns/div)
DS100056-9
After Equalization:
300m of Belden 8281 Coaxial Cable
Equalizer Output (200mV/div) |
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Data Rate: 270Mbps |
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Time (1ns/div)
DS100056-10
5 |
www.national.com |
Typical Performance Characteristics
Before Equalization:
100m Category 5 UTP at 51.7Mbps
(200mV/div)Input
Equalizer Data Rate: 51.7Mbps
Time (6ns/div)
DS100056-11
(Continued)
After Equalization:
100m Category 5 UTP at 51.7Mbps
Equalizer Output (200mV/div) |
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Data Rate: 51.7Mbps |
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Time (6ns/div) |
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DS100056-14
Before Equalization:
100m Category 5 UTP at 155Mbps
(200mV/div)Input
Equalizer Data Rate: 155Mbps
Time (2ns/div)
DS100056-12
After Equalization:
100m Category 5 UTP at 155Mbps
Equalizer Output (200mV/div) |
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Data Rate: 155Mbps |
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Time (2ns/div)
DS100056-15
Before Equalization:
100m Category 5 UTP at 311Mbps
(200mV/div)Input
Equalizer Data Rate: 311Mbps
Time (1ns/div)
DS100056-13
After Equalization:
100m Category 5 UTP at 311Mbps
Equalizer Output (200mV/div) |
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Data Rate: 311Mbps |
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Time (1ns/div)
DS100056-16
www.national.com |
6 |
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