LMH1297 I/O Datasheet

LMH1297 Datasheet PDF, Equivalent


Part Number

LMH1297

Description

12G UHD-SDI Bidirectional I/O

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LMH1297
SNLS545C – MARCH 2017 – REVISED JULY 2019
LMH1297 12G UHD-SDI Bidirectional I/O With Integrated Reclocker
1 Features
1 User-configurable adaptive cable equalizer or
cable driver with integrated reclocker
• 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
• On-chip 75-termination and return loss
compensation network
• EQ (equalizer) mode:
– Adaptive cable equalizer with integrated
reclocker
– 100-Ω Output driver with de-emphasis
– Reclocked 75-Ω loop-through output
– EQ mode cable reach
(Belden 1694A, SDI_OUT disabled):
– 75 m at 11.88 Gbps
– 120 m at 5.94 Gbps
– 200 m at 2.97 Gbps
– 300 m at 1.485 Gbps
– 600 m at 270 Mbps
• Cable driver (CD) mode:
– Dual differential output cable drivers with
integrated reclocker
– Adaptive PCB input equalizer
– Reclocked 100-Ω loopback output
• Automatic pre-emphasis and slew rate control on
75-Ω outputs
• Polarity inversion on 75-and 100-outputs
• Automatic power save in absence of input signal
– Power dissipation: 25 mW (Typical)
• Power-down control through ENABLE pin
• Single 2.5-V Supply
– EQ mode power dissipation: 275 mW (Typical)
– CD mode power dissipation: 305 mW (Typical)
• Programmable through pins, SPI, or SMBus
interface
• –40°C to +85°C operating temperature range
• 5-mm × 5-mm, 32-Pin QFN package
2 Applications
• SMPTE compatible serial digital interface
• UHDTV/4K/8K/HDTV/SDTV video
• IP media gateway
• Digital video processing and editing
3 Description
The LMH1297 is a 12G UHD-SDI 75-bidirectional
I/O with integrated reclocker. This device can be
configured either in input mode as an adaptive cable
equalizer or in output mode as a dual cable driver,
allowing system designers the flexibility to use a
single BNC either as an input or output port,
simplifying UHD video hardware designs. The
integrated reclocker locks to all supported SMPTE
data rates up to 11.88 Gbps in both modes. The
bidirectional I/O has an on-chip 75-termination and
return loss compensation network that meets the
stringent SMPTE return loss requirements.
An additional 75-driver output allows the LMH1297
to support a variety of system functions. In EQ
(Equalizer) Mode, this second 75-driver can be
used as a loop-through output. In Cable Driver (CD)
Mode, this 75-driver can be used as a second fan-
out cable driver. The host-side 100-driver can also
be used as a loop-back output in CD Mode for
monitoring purposes.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMH1297
QFN (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
SDI_IO±
Cable
EQ
TX_RX
Cable
Driver
M
U
X
CDR
M
U
X
SDI_OUT±
Cable
Driver
LDO
Power
Management
Control
Control Logic
100-Ÿ
Driver
OUT0±
PCB
EQ
IN0±
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.

LMH1297
LMH1297
SNLS545C – MARCH 2017 – REVISED JULY 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (continued)......................................... 3
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 7
7.1 Absolute Maximum Ratings ...................................... 7
7.2 ESD Ratings.............................................................. 7
7.3 Recommended Operating Conditions....................... 7
7.4 Thermal Information .................................................. 8
7.5 Electrical Characteristics........................................... 8
7.6 Recommended SMBus Interface Timing
Specifications ........................................................... 14
7.7 Serial Parallel Interface (SPI) Timing
Specifications ........................................................... 14
7.8 Typical Characteristics ............................................ 16
8 Detailed Description ............................................ 17
8.1 Overview ................................................................. 17
8.2 Functional Block Diagram ....................................... 17
8.3 Feature Description................................................. 18
8.4 Device Functional Modes........................................ 25
8.5 Register Maps ........................................................ 29
9 Application and Implementation ........................ 30
9.1 Application Information............................................ 30
9.2 Typical Applications ................................................ 31
10 Power Supply Recommendations ..................... 38
11 Layout................................................................... 38
11.1 Layout Guidelines ................................................. 38
11.2 Layout Example .................................................... 40
12 Device and Documentation Support ................. 41
12.1 Documentation Support ........................................ 41
12.2 Receiving Notification of Documentation Updates 41
12.3 Community Resources.......................................... 41
12.4 Trademarks ........................................................... 41
12.5 Electrostatic Discharge Caution ............................ 41
12.6 Export Control Notice............................................ 41
12.7 Glossary ................................................................ 41
13 Mechanical, Packaging, and Orderable
Information ........................................................... 41
13.1 Package Option Addendum .................................. 42
4 Revision History
Changes from Revision B (September 2017) to Revision C
Page
• First public release of document............................................................................................................................................. 1
2 Submit Documentation Feedback
Product Folder Links: LMH1297
Copyright © 2017–2019, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity LMH1297 SNLS545C – MARCH 2017 – REVISED JULY 2019 LMH1297 12G UHD- SDI Bidirectional I/O With Integrated R eclocker 1 Features •1 User-configur able adaptive cable equalizer or cable driver with integrated reclocker • Su pports ST-2082-1 (12G), ST-2081-1 (6G), ST-424 (3G), ST-292 (HD), and ST-259 ( SD) • Compatible with DVB-ASI and AES 10 (MADI) • Integrated reclocker lock s to SMPTE rates of 11.88 Gbps, 5.94 Gb ps, 2.97 Gbps, 1.485 Gbps, or divide-by -1.001 sub-rates and 270 Mbps • On-ch ip 75-Ω termination and return loss c ompensation network • EQ (equalizer) mode: – Adaptive cable equalizer with integrated reclocker – 100-Ω Output driver with de-emphasis – Reclocked 75-Ω loop-through output – EQ mode c able reach (Belden 1694A, SDI_OUT disab led): – 75 m at 11.88 Gbps – 120 m at 5.94 Gbps – 200 m at 2.97 Gbps – 300 m at 1.485 Gbps – 600 m at 270 Mbps • Cable driver (CD) mode: – Dual differential output cable.
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