MAX3815ACCM+T Maxim Integrated Products, MAX3815ACCM+T Datasheet - Page 7

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MAX3815ACCM+T

Manufacturer Part Number
MAX3815ACCM+T
Description
IC DGTL VIDEO EQUALIZER 48TQFP
Manufacturer
Maxim Integrated Products
Type
Video Equalizerr
Datasheet

Specifications of MAX3815ACCM+T

Applications
HDMI, DVI, Receivers
Mounting Type
Surface Mount
Package / Case
48-TQFP Exposed Pad, 48-eTQFP, 48-HTQFP, 48-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Figure 1. Functional Diagram
The MAX3815A TMDS equalizer accepts differential
CML input data at rates of 250Mbps up to 2.25Gbps
(individual channel data rate). It automatically adjusts
to skin-effect losses in copper cable. It consists of four
CML input buffers, a loss-of-clock signal detector, three
independent adaptive equalizers, four limiting amplifiers,
and four output buffers (Figure 1).
The input buffers and the output drivers are implemented
using current-mode logic (CML) (see Figures 4 and 5). The
output drivers are open-collector and can be turned off
with the OUTON pin. The OUTLEVEL pin sets the output
drive current to one of three levels; see the Applications
Information and Pin Description sections for more infor-
mation. For details on interfacing with CML, refer to
Application Note 291: HFAN-01.0: Introduction to LVDS,
PECL, and CML.
CML Input Buffers and Output Drivers
RXC_IN+/-
RX0_IN+/-
RX1_IN+/-
RX2_IN+/-
CLKLOS
_______________________________________________________________________________________
TERMINATED
3.3V CML
TERMINATED
3.3V CML
TERMINATED
3.3V CML
TERMINATED
3.3V CML
Detailed Description
CLOCK LOS
DETECTOR
TMDS Digital Video Equalizer for
BUFFER
BUFFER
BUFFER
BUFFER
INPUT
INPUT
INPUT
INPUT
MAX3815A
ADAPTIVE
ADAPTIVE
ADAPTIVE
EQ
EQ
EQ
The loss-of-clock signal detector indicates a loss-of-
clock signal at the CLKLOS pin. This is an open-collector
output that must be connected to V
external pullup. This resistor is required whether or not
the LOS output is used.
The three data channels each contain an independent
adaptive equalizer. Each channel analyzes the incom-
ing signal and determines the amount of equalization to
apply.
The limiting amplifier amplifies the signal from the adap-
tive equalizer and truncates the top and bottom of the
waveform to provide a clean high- and low-level signal
to the output drivers.
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
LIMITING
LIMITING
LIMITING
LIMITING
HDMI/DVI Cables
Loss-of-Clock Signal Detector
DRIVER
DRIVER
DRIVER
DRIVER
Adaptive Equalizer
Limiting Amplifier
RX0_OUT+/-
RX1_OUT+/-
RX2_OUT+/-
EQCONTROL
RXC_OUT+/-
OUTON
OUTLEVEL
CC
through a 4.7kω
7

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