DS22EV5110-EVKC National Semiconductor, DS22EV5110-EVKC Datasheet - Page 9

• Manufacturer Part Number: DS22EV5110-EVKC
• Description: DEMO KIT CAT5 EXTENDER HDMI
• Manufacturer: National Semiconductor

Specifications of DS22EV5110-EVKC

• Main Purpose: Video, Cable Extender
• Embedded: No
• Utilized Ic / Part: DS22EV5110
• Primary Attributes: DVI/HDMI Extended Reach Equalizer with Retimer and Output De-Emphasis
• Secondary Attributes: HDMI Extender for CAT5 & CAT6 Cables
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Functional Description
The DS22EV5110 DVI, HDMI Extended Reach Equalizer with
Retimer and Output De-Emphasis consists of three data
PHASE-LOCKED-LOCKED LOOP (PLL)
The clock channel has a high-performance PLL that creates
a low jitter sampling clock for the clock and data recovery units
in the data channels. An external loop filter, composed of 2.2
nF (+ 5% tolerance) capacitor and a 3.3 kΩ (+ 5% tolerance)
resistor in series, are required between the LFp and the LFn
pins.
CLOCK-DATA RECOVERY UNIT (CDR)
Each TMDS data channel has a CDR that operates indepen-
dently from other TMDS data channels. Each CDR aligns the
sampling clock edges by digitally interpolating the clock from
PLL of the TMDS clock channel. The device is designed to
connect to DVI/HDMI compatible transmitter and receiver at
any data rate between 250 Mbps to 2.25 Gbps. The loop
bandwidth of the CDR is approximately baud_rate/1000, i.e.
2.25 MHz for 2.25 Gbps data.
INPUT EQUALIZATION
The input data channel equalizers support eight pro-
grammable levels of equalization boost
Table 1
by the EQ
FIGURE 6. Block Diagram
9
channels and a clock channel. Each data channel consists of
a TMDS compatible receiver with a power efficient equalizer,
a dedicated clock-data recovery (CDR) unit, and a TMDS
compatible transmitter.
pins (EQ [2:0]). The range of boost settings provided enables
the DS22EV5110 to address a wide range of transmission line
path loss scenarios, enabling support for a variety of data
rates and formats. See Applications Information for recom-
mended EQ settings.
OUTPUT DE-EMPHASIS
De-emphasis is the conditioning function for use in compen-
sating against backplane and cable transmission loss. The
DS22EV5110 provides four steps of de-emphasis ranging
from 0, 3, 6 and 9 dB, user-selectable dependent on the loss
profile of output channels. Table 2. shows the De-emphasis
control with default VO = 1000 mVp-p, and
driver de-emphasis waveform.
OUTPUT VO CONTROL
Output differential voltage (VO) is controlled through
VOD_CRL pin ties an external resistor to the ground as shown
in
used to be 12 kΩ to 24 kΩ. +5% tolerance is recommended.
Table
3. Users should restrict the external resistor values
30094915
Figure
www.national.com
7. shows a