CLC034MAX/NOPB National Semiconductor, CLC034MAX/NOPB Datasheet - Page 6

• Manufacturer Part Number: CLC034MAX/NOPB
• Manufacturer: National Semiconductor

Specifications of CLC034MAX/NOPB

• Lead Free Status / Rohs Status: Compliant

www.national.com
Device Operation
The CLC034 correctly handles equalizer pathological signals
for standard definition and high definition serial digital video,
as described in SMPTE RP 178 and RP 198, respectively.
OUTPUT INTERFACING
The SDO and SDO outputs are internally loaded with 50Ω.
They produce a 750 mV
375 mV
Application Information
PCB LAYOUT RECOMMENDATIONS
Please refer to the following Application Note on National’s
website: AN-1372, “CLC034 PCB Layout Techniques.”
REPLACING THE GENNUM GS1524
The CLC034 is footprint compatible with the Gennum
GS1524 and GS1524A.
SUPPLY CURRENT VS. CABLE LENGTH
The supply current (I
being equalized. The current is highest for short cable and
decreases as the cable length is increased. Figure 1 shows
supply current vs. Belden 1694A cable length for 1.485 Gbps
data and Figure 2 shows supply current vs. Belden 1694A
cable length for 270 Mbps data.
Note 10: For 270 Mbps input data rates, the CLC034’s maximum acceptable V
meters cable. A 10m length of Belden 8281 cable attenuates the signal enough for SMPTE 259M compliance.
Input Data Rate
(Mbps)
143, 177
270, 360, 540
1485
FIGURE 1. Supply Current vs. Belden 1694A Cable
P-P
single-ended output.
Length, 1.485 Gbps
CC
Conditions if CD/MUTE Used
Do not use CD/MUTE (tie it to GND)
Acceptable V
Acceptable V
) depends on the amount of cable
TABLE 1. V
P-P
(Continued)
differential output, or a
SDI
SDI
SDI
: 720 to 830 mV
: 720 to 880 mV
Conditions for Proper CD/MUTE Use vs. Input Data Rate
20085913
P-P
P-P
(Note 10)
SDI
6
is only 0.5 dB below the SMPTE 259M specified 880 mV
ADDITIONAL DETAILS FOR USING CARRIER DETECT /
MUTE FEATURE
Table 1 outlines the equalizer input operating conditions
based on zero meters of cable length. This is not a condition
normally seen in standard applications of SDI equalizers.
Typically there is some length of cable between the signal
source and the equalizer (hence the need for equalization).
Any cable length will attenuate (reduce) the SDI signal am-
plitude from the amplitude transmitted at the source. The
table specifies voltage levels measured at the input of the
equalizer which is equivalent to a zero meter cable length
from the signal source.
The output will mute if the SDI input signal (V
ceeds the maximum input voltage (V
CD/MUTE (tie it to GND) to avoid unwanted muting of the
output.
FIGURE 2. Supply Current vs. Belden 1694A Cable
Conditions if CD/MUTE Disabled
(CD/MUTE Tied to GND)
Acceptable V
(all input data rates)
Length, 270 Mbps
SDI
: 720 to 950 mV
P-P
SDI
P-P
max). Disable
amplitude for zero
20085915
SDI
) ex-