Datasheet
within a twisted pair (STP or UTP), usually a result of
cable twist or dielectric imbalance. Refer to Application
Note
HFAN-04.5.4: ‘Jitter Happens’ when a Twisted
Pair is Unbalanced
for more information.
Layout Considerations
The data and clock inputs are the most critical paths for
the MAX3815 and great care should be taken to mini-
mize discontinuities on these transmission lines
between the connector and the IC. Here are some sug-
gestions for maximizing the performance of the
MAX3815:
• The data and clock inputs should be wired directly
between the cable connector and IC without stubs.
• Input and output data channel designations are
only a guide. Polarity assignments can be swapped
and channel paths can be interchanged.
• An uninterrupted ground plane should be posi-
tioned beneath the high-speed I/Os.
• Ground-path vias should be placed close to the IC
and the input/output interfaces to allow a return cur-
rent path to the IC and the DVI cable.
• Maintain 100Ω differential transmission line imped-
ance into and out of the MAX3815.
• Use good high-frequency layout techniques and
multilayer boards with an uninterrupted ground
plane to minimize EMI and crosstalk.
Exposed-Pad Package
The exposed pad on the 48-pin TQFP-EP provides a
very low thermal resistance path for heat removal from
the IC. The pad is also electrical ground on the
MAX3815 and must be soldered to the circuit board
ground for proper thermal and electrical performance.
Refer to Maxim Application Note
HFAN-08.1: Thermal
Considerations of QFN and Other Exposed-Paddle
Packages
for additional information.
Chip Information
PROCESS: SiGe BiPOLAR
MAX3815
TMDS Digital Video Equalizer for DVI/HDMI
Cables
_______________________________________________________________________________________ 9
5
20
10
40
30
50
60
32
AWG
28
AWG
30
AWG
26
AWG
24
AWG
22
AWG
TYPICAL MAX3815 CABLE REACH
DVI WIRE GAUGE
CABLE LENGTH (meters)
LIMIT OF CABLE LENGTH WITHOUT EQ AT 1.65Gbps
TYPICAL DVI WIRE GAUGE RANGE
SHADED AREA = MAX3815
USABLE CABLE LENGTH RANGE
AT ALL DVI RATES UP TO 1.65Gbps
Figure 6. Cable Reach
Package Information
(For the latest package outline information, go to
www.maxim-ic.com/packages
.)
PACKAGE TYPE DOCUMENT NO.
48 TQFP
21-0065