Texas Instruments LMH1982 User Manual Download Page 14

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest
issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and
complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale
supplied at the time of order acknowledgment.

TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary
to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily
performed.

TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information
published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or
endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the
third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration
and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered
documentation. Information of third parties may be subject to additional restrictions.

Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service
voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.
TI is not responsible or liable for any such statements.

Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which
anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.

In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.

No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.

Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components
which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and
regulatory requirements in connection with such use.

TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of
non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.

Products

Applications

Audio

www.ti.com/audio

Automotive and Transportation

www.ti.com/automotive

Amplifiers

amplifier.ti.com

Communications and Telecom

www.ti.com/communications

Data Converters

dataconverter.ti.com

Computers and Peripherals

www.ti.com/computers

DLP® Products

www.dlp.com

Consumer Electronics

www.ti.com/consumer-apps

DSP

dsp.ti.com

Energy and Lighting

www.ti.com/energy

Clocks and Timers

www.ti.com/clocks

Industrial

www.ti.com/industrial

Interface

interface.ti.com

Medical

www.ti.com/medical

Logic

logic.ti.com

Security

www.ti.com/security

Power Mgmt

power.ti.com

Space, Avionics and Defense

www.ti.com/space-avionics-defense

Microcontrollers

microcontroller.ti.com

Video and Imaging

www.ti.com/video

RFID

www.ti-rfid.com

OMAP Applications Processors

www.ti.com/omap

TI E2E Community

e2e.ti.com

Wireless Connectivity

www.ti.com/wirelessconnectivity

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

Copyright © 2013, Texas Instruments Incorporated

Summary of Contents for LMH1982

Page 1: ...ted in the References section 1 1 USB Interface Board Headers X2 and X4 of the USB interface board should be plugged into headers J7 and J11 of the evaluation board The USB board s firmware supports the I2 C interface which enables the user to program the LMH1982 from a PC running the evaluation software The USB board can also provide 5V from the PC s USB port to power the LDO regulators on the ev...

Page 2: ...sistors from R22 and R3 and then using a current meter in series 1 3 Reference Ports The LMH1982 has two reference ports REF_A and REF_B with H sync and V sync inputs which are used for phase locking the outputs in Genlock mode The input signals can be measured at test points TP27 TP28 TP30 and TP31 1 3 1 Analog Reference Input An SD or HD analog video signal can be applied to the BNC connector J2...

Page 3: ...in Name Pin Pin Name 1 GND 8 HIN_A 2 GND 7 VIN_A 3 GND 6 HIN_B 4 GND 5 VIN_B 1 4 Output Clock The LVDS output SD and HD clocks from the LMH1982 are routed via controlled 100Ω differential impedance lines to edge mount SMA connectors as indicated in Table 5 If a differential probe will be used to measure the clocks directly on the board then the differential lines should be terminated by populating...

Page 4: ...rent loop filter component values or topologies to meet output clock jitter and lock time requirements for other input reference signals and applications For example to generate low jitter output clock from a high jitter input reference e g recovered H signal from an FPGA SDI receiver a narrowband loop filter e g BW 1 Hz is recommended for maximum jitter attenuation In addition to changing the loo...

Page 5: ...e functional after they have been enabled by programming the control registers During normal operation the RESET input must be set high otherwise the device will not function properly To reset the control registers of the LMH1982 toggle RESET low for at least 10 µs for proper reset and then set high To enable programming via the I2 C interface the I2C_ENABLE input must be set low If I2C_ENABLE is ...

Page 6: ...e Windows operating system OS will interpret the USB board as a Human Interface Device HID and use Microsoft s standard HID driver included in the OS The LMH1982 evaluation software application can access the USB board through dynamic link libraries which are used by the PC application to control the LMH1982 using the I2 C interface For more information consult the USB board reference manual and L...

Page 7: ...P38693MP 3 3 Vin 2 SD 1 Vout 3 ADJ 4 GND C2 10 PF 5 R2 0 C3 47 PF C11 100 nF VCC3V3 EXT3V3 JP1 C42 10 PF C41 47 PF C5 100 nF C13 100 nF VDD TP3 VDD C9 100 nF R3 0 VCC3V3 www ti com Evaluation Board Schematic 2 Evaluation Board Schematic Figure 3 Schematic 1 of 4 LP38693 LDO Regulators with External Power Input Header 7 SNOA527A May 2008 Revised April 2013 AN 1841 LMH1982 Evaluation Board Submit Do...

Page 8: ...50 VSOUT VSYNC VSOUT R1 10 0k 1 1 REXT C32 10 nF Vcc3 10 CSOUT 12 BPOUT 13 OEOUT 14 C36 10 PF C4 100 nF VCC TP2 VCC VCC3V3 R26 50 OEOUT TP7 OEOUT VIN C39 560 pF C30 OPEN R24 100 R23 75 J2 ANALOG REF 1 Evaluation Board Schematic www ti com Figure 4 Schematic 2 of 4 LMH1981 and LMH1980 Sync Separators 8 AN 1841 LMH1982 Evaluation Board SNOA527A May 2008 Revised April 2013 Submit Documentation Feedba...

Page 9: ...125K8X R20 NP 0 R21 NP 0 Y1 6 OE2 7 C19 100 nF C38 10 PF VCC HREF B VREF A 2 1 6 SW2 SWITCH 4X2 www ti com Evaluation Board Schematic Figure 5 Schematic 3 of 4 Input Header and Switch Controlled Logic Buffer 9 SNOA527A May 2008 Revised April 2013 AN 1841 LMH1982 Evaluation Board Submit Documentation Feedback Copyright 2008 2013 Texas Instruments Incorporated ...

Page 10: ... C50 100 nF C51 100 nF 0 R22 TP1 VDD 8 VREF_B 7 HREF_B 6 REF_SEL 5 VREF_A 4 HREF_A 3 2 GND 1 VC_FREERUN 50 R41 REF_SEL 50 R6 HREF_B 50 R7 VREF_B TP30 HREF_B TP31 VREF_B 50 R25 VREF_A TP28 VREF_A 50 R14 HREF_A TP27 HREF_A C24 100 nF R13 NP 0 R12 50 R9 50 R10 TP23 TOF_OUT TOF_OUT 100 nF C23 C22 100 nF U5 U8 LMP7701 C22 100 nF 3 4 1 2 5 C29 100 nF P1 50k NP R27 JP5 U6 LMP7701 C12 100 nF 3 4 1 2 5 50 ...

Page 11: ... Layout Figure 7 PCB Layout 1 of 2 Top Routing Layer 1 dark gray and Ground Plane Layer 2 light gray 11 SNOA527A May 2008 Revised April 2013 AN 1841 LMH1982 Evaluation Board Submit Documentation Feedback Copyright 2008 2013 Texas Instruments Incorporated ...

Page 12: ... C29 20 C33 C44 C50 100 nF X7R 0603 1 C51 100 nF X7R 0805 1 C6 100 nF X7R 1206 1 C13 100 µF X7R 0603 2 C17 C28 1 µF X7R 0805 8 C2 C7 C38 C42 C43 C53 C55 10 µF X5R 0805 2 C3 C8 47 µF 3528 TANT B 3 C10 C27 C41 22 µF X5R 1206 2 C26 C32 10 nF X7R 0603 1 C39 560 pF NPO 0603 2 D3 D4 GREEN SMT LED 0805 1 J1 6 PIN HEADER 6X1 1 J2 EDGE MOUNT BNC SMA 12 AN 1841 LMH1982 Evaluation Board SNOA527A May 2008 Rev...

Page 13: ...INT 1 U1 LP38693 SOT223 5 1 U2 LP38693 SOT223 5 1 U3 LMH1980 NP 1 VSSOP10 1 U4 LMH1981 TSSOP14 1 U5 LMH1982 WQFN 32 2 U6 U8 LMP7701 SOT23 5 1 U7 NC7WZ125K8X US 8 1 X1 CTS 357LB3I27M0000 27 MHz VCXO VCXO 7 8 4 40 THREADED NYLON 4 STANDOFF 4 3 8 4 40 SCREW C15 C30 C40 R13 R20 R21 R27 NP 1 1 NP Not Populated 5 References LMH1982 Multi rate Video Clock Generator with Genlock Data Sheet SNLS289 LMH1981...

Page 14: ...esponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

Page 15: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments LMH1982SQEEVAL LMH1982SQEEVAL NOPB ...

Reviews: