LMH1228 Datasheet, PDF (1/10 Pages) Texas Instruments – 12G UHD-SDI Dual Output Cable Driver With Integrated Reclocker

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LMH1228
SNLS575 – MARCH 2017
LMH1228 12G UHD-SDI Dual Output Cable Driver With Integrated Reclocker
1 Features
•1 Supports ST-2082-1 (12G), ST-2081-1 (6G), ST-
424 (3G), ST-292 (HD), and ST-259 (SD)
• Compatible With DVB-ASI and AES10 (MADI)
• Integrated Reclocker Locks to SMPTE Rates of
11.88 Gbps, 5.94 Gbps, 2.97 Gbps, 1.485 Gbps
or Divide-by-1.001 Sub-Rates and 270 Mbps
• Integrated Eye Opening Monitor (EOM)
• Dual Differential Output Cable Drivers
• On-Chip 75-Ω Termination and Return Loss
Compensation Network
• Adaptive PCB Input Equalizer
• Reclocked 100-Ω Loop-Back Output
• Automatic Slew Rate Control on 75-Ω Outputs
• Automatic Pre-Emphasis and Output Amplitude on
75-Ω Outputs
• Programmable De-Emphasis and Output
Amplitude on 100-Ω Output
• Polarity Inversion on 75-Ω and 100-Ω Outputs
• Automatic Power Save in Absence of Input Signal
– Power Consumption: 25 mW (Typical)
• Power-Down Control Through ENABLE Pin
• Single 2.5-V Supply
– Power Consumption: 315 mW (Typical)
• Programmable Through Pins, SPI, or SMBus
Interface
• –40°C to +85°C Operating Temperature Range
• 5-mm × 5-mm, 32-pin WQFN Package
2 Applications
• SMPTE Compatible Serial Digital Interface
• UHDTV/4K/8K/HDTV/SDTV Video
• Broadcast Video Routers, Switchers, Distribution
Amplifiers, and Monitors
• Digital Video Processing and Editing
3 Description
LMH1228 device is a 12G UHD-SDI low power dual
output cable driver with integrated reclocker. It
supports SMPTE video rates up to 11.88 Gbps,
enabling UHD video for 4K/8K applications. With a
wide range clock-and-data recovery (CDR) circuit, the
on-chip reclocker automatically detects and locks to
all SMPTE video rates up to 11.88 Gbps. The
additional reclocked 100-Ω driver output on the host-
side can be used for monitoring or signal distribution
purposes.
The on-chip reclocker attenuates high-frequency jitter
and fully regenerates the data using a clean, low-jitter
clock. The reclocker has a built-in loop filter and does
not require any input reference clock. The LMH1228
also has an internal eye opening monitor and a
programmable pin for CDR lock indication, input
signal detect, or hardware interrupts to support
system diagnostics and board bring-up.
The LMH1228 is powered from a single 2.5-V supply.
It is offered in a small footprint 5 mm × 5 mm 32-pin
WQFN package. The LMH1228 is pin compatible with
the LMH1208 (12G Dual Cable Driver).
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMH1228
WQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Block Diagram
OUT0±
100-Ÿ
Driver
IN0±
PCB
EQ
M
CDR
U
X
Cable
Driver
Cable
Driver
SDI_OUT1±
SDI_OUT2±
LDO
Power
Management
Control
Control Logic
Serial
Interface
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.