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LMH1981MT/NOPB
Texas Instruments
IC VIDEO SYNC 14TSSOP
5206 Pcs New Original In Stock
Video Separator IC Serial NTSC, PAL 14-TSSOP Package
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5.0 / 5.0
- (145 Ratings)
LMH1981MT/NOPB
Product Overview
1352864
DiGi Electronics Part Number
LMH1981MT/NOPB-DGManufacturer
Texas Instruments
LMH1981MT/NOPB
Description
IC VIDEO SYNC 14TSSOPInventory
5206 Pcs New Original In Stock
Video Separator IC Serial NTSC, PAL 14-TSSOP Package
Quantity
Minimum 1
Minimum 1
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LMH1981MT/NOPB Technical Specifications
Category
Linear, Video Processing
Packaging
Tube
Series
-
Product Status
Active
Function
Separator
Applications
Professional Video
Standards
NTSC, PAL
Control Interface
Serial
Voltage - Supply
3.3V ~ 5V
Mounting Type
Surface Mount
Package / Case
14-TSSOP (0.173", 4.40mm Width)
Supplier Device Package
14-TSSOP
Base Product Number
LMH1981
Datasheet & Documents
HTML Datasheet
LMH1981MT/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LMH1981MT
-LMH1981MT/NOPB-DG
LMH1981MTNOPB
LMH1981MT-DG
-LMH1981MT-NDR
Standard Package
94
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
発送の速さに感動しました。予定通り届いて助かりました。
de desembre 02, 2025
Customer service promptly addressed my shipment packaging concerns, ensuring my order was sent out correctly and safely.
de desembre 02, 2025
DiGi Electronics' products are built with precision and high-quality materials.
de desembre 02, 2025
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Frequently Asked Questions (FAQ)
What are the key design-in risks when integrating the LMH1981MT/NOPB into a mixed-voltage video system operating with both 3.3V and 5V logic domains?
When integrating the LMH1981MT/NOPB in mixed-voltage systems, a major risk is level incompatibility with control signals. The LMH1981MT/NOPB supports a wide 3.3V to 5V supply range, but if the serial control interface is driven by 3.3V logic while the device operates at 5V, ensure the input pins are 5V-tolerant—verify in TI’s application note. Use level translators like the TXS0108E if driving from lower-voltage FPGAs or microcontrollers to avoid latch-up or degradation. Additionally, maintain stable supply domains with local decoupling (100nF ceramic + 1µF) near VDD pins to prevent noise coupling across voltage rails during sync separation.
Can the LMH1981MT/NOPB reliably replace the MAX9595 in legacy NTSC/PAL video separator designs, and what are the critical pinout or timing differences?
Yes, the LMH1981MT/NOPB can replace the MAX9595 in most NTSC/PAL applications, but key differences affect drop-in compatibility. The LMH1981MT/NOPB uses a serial control interface versus MAX9595’s parallel control, requiring firmware updates to handle configuration via serial instead of GPIO. Pinouts differ significantly—check the TI replacement guide for PCB layout changes. Also, the LMH1981MT/NOPB has better noise rejection in low-signal conditions but requires external clamping for composite video input if the source exceeds 1.4Vp-p. Always simulate the transition with SPICE models from both vendors to confirm timing and sync pulse accuracy.
What practical steps should be taken to ensure signal integrity when routing composite video into the LMH1981MT/NOPB on a densely packed PCB?
To maintain signal integrity with the LMH1981MT/NOPB, treat the composite video input (VIN) as a high-bandwidth analog trace. Use controlled impedance routing (~75Ω) with a continuous ground plane and minimize stub length. Place a 75Ω series or parallel termination resistor near the LMH1981MT/NOPB input pin based on source impedance matching. Avoid crossing digital traces, especially clock lines, and shield the analog path if routing over split planes. Additionally, use a 100nF AC-coupling capacitor with DC restoration via the CLAMP pin to prevent baseline wander, which can distort sync detection under varying video content.
How does the LMH1981MT/NOPB perform in high-reliability professional video applications with fluctuating video standards, and what configuration precautions are needed?
The LMH1981MT/NOPB is well-suited for professional video environments with dynamic NTSC/PAL switching, but automatic mode detection must be configured carefully. While it supports both standards, misidentification can occur with non-standard or degraded signals (e.g., VCR outputs). To enhance reliability, use the serial interface to force the video standard based on external metadata (e.g., FPGA detection) rather than relying solely on auto-detect mode. Additionally, enable the HSYNC and VSYNC validation flags in the status register and implement system-level error recovery in firmware. Avoid frequent mode toggling, which can stress internal timing loops—implement a debounce delay of at least 1s between forced reconfigurations.
What are the thermal and long-term reliability implications of using the LMH1981MT/NOPB in enclosed industrial enclosures with limited airflow?
The LMH1981MT/NOPB, in its 14-TSSOP package, has moderate thermal performance with a ΨJT of ~18°C/W. In sealed industrial enclosures, self-heating under continuous operation can raise junction temperature beyond 100°C if ambient exceeds 60°C. To ensure long-term reliability, limit ambient exposure to under 70°C, provide PCB copper padding (exposed thermal pad) connected to ground plane for heat spreading, and use conformal coating only if it doesn’t trap heat. The LMH1981MT/NOPB is MSL1 and moisture-resistant, but thermal cycling in harsh environments can promote solder joint fatigue—ensure proper reflow profiling during assembly and consider underfill for vibration-prone applications.
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LMH1981MT/NOPB CAD Models
Texas Instruments LMH1981MT/NOPB PCB symbols & footprints
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