LMH0302 Datasheet, PDF (6/18 Pages) Texas Instruments – 3-Gbps HD/SD SDI Cable Driver

LMH0302
SNLS247H – APRIL 2007 – REVISED JUNE 2016
7 Detailed Description
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7.1 Overview
The LMH0302 ST 424, ST292, ST259 serial digital cable driver is a monolithic, high-speed cable driver designed
for use in serial digital video data transmission applications. The LMH0302 drives 75-Ω transmission lines
(Belden 8281, 1694A, Canare L-5CFB, or equivalent) at data rates up to 2.97 Gbps.
The LMH0302 provides two selectable slew rates for ST 259 and ST 292/424 compliance. The output voltage
swing is adjustable through a single external resistor ( R_REF).
The LMH0302 is powered from a single 3.3-V supply. Power consumption is typically 125 mW in SD mode and
165 mW in HD mode. The LMH0302 is available in a 16-pin WQFN package.
7.2 Functional Block Diagram
SDO
SDO
SDI
SDI
RREF
+
+
-
-
Bias Generator
Control
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7.3 Feature Description
The LMH0302 data path consists of several key blocks:
• Input interfacing
• Output interfacing
• Output slew rate control
• Output enable
7.3.1 Input Interfacing
The LMH0302 accepts either differential or single-ended input. The inputs are self-biased, allowing for simple AC
or DC coupling. DC-coupled inputs must be kept within the specified common-mode range.
7.3.2 Output Interfacing
The LMH0302 uses current mode outputs. Single-ended output levels are 800 mV_P-P into 75-Ω AC-coupled
coaxial cable with an R_REF resistor of 750 Ω. The R_REF resistor is connected between the R_REF pin and V_CC.
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