MAX3814CHJ+ Maxim Integrated Products, MAX3814CHJ+ Datasheet - Page 9

• Manufacturer Part Number: MAX3814CHJ+
• Description: IC DRVR/EQUALIZER CABLE 32-TQFP
• Manufacturer: Maxim Integrated Products
• Type: Driverr

Specifications of MAX3814CHJ+

• Number Of Drivers/receivers: 4/0
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Protocol: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The ENABLE pin is an LVTTL input that allows the user
to shut off the output-collector currents, thereby reduc-
ing power consumption of the device. Forcing this pin
high turns the output currents off; forcing this pin low
(normal operation) turns the currents on.
Figure 5 shows a simplified circuit for both the output
and enable controls.
Figure 4. Simplified Output Circuit with Back Termination
Resistor
ENABLE = HIGH
TRANSIENT
SUPRESSOR
CLAMP
10mA
_______________________________________________________________________________________
5mA
LEVEL = LOW
Output Enable Control
OUT_+
OUT_-
BACK TERMINATION
50Ω
200Ω
V
T
50Ω
DVI/HDMI TMDS FR-4 and
Figure 6a shows a typical TMDS channel from a graph-
ics board of a laptop computer to a remote display.
Maintaining a 100Ω differential impedance for this
channel has its challenges. Besides proper board lay-
out of traces, there are multiple reflection points (A to
H). For example, at interface F in Figure 6a, a circular
arrow shows a reflection at the connector of a remote
display. When these reflections hit another interface,
they reflect again and thus become echoes corrupting
the incident signal. In Figure 6b, the MAX3814 is used
to equalize losses, isolate reflections, and redrive the
transmission line with high fidelity.
Figure 5. Simplified Input Circuitry for Output Level (LEVEL)
and Enable (ENABLE) Control
Cable Equalizer/Driver
ENABLE
INPUTS
LEVEL,
88kΩ
Applications Information
TRANSIENT
SUPRESSOR
CLAMP
44kΩ
V
CC
44kΩ
50kΩ
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