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Texas Instruments LM1262NA/NOPB
- Part No.:
- LM1262NA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Video Processing
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
LM1262NA/NOPB.pdf
- Description:
- IC VIDEO PREAMPLIFIER 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,397
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Product details
Overview
LM1262NA/NOPB from Texas Instruments (formerly National Semiconductor) is a 200 MHz I²C-compatible RGB video pre-amplifier IC designed for CRT monitor front-end signal conditioning. It integrates three high-speed video amplifiers, four 8-bit DACs for brightness/bias control, on-chip OSD mixing, ABL interface, and black-level clamping-enabling direct digital control of gain, contrast, and DC offset in high-resolution 1600×1200@85 Hz bus-controlled monitors.
For engineers reviewing the LM1262NA/NOPB datasheet, LM1262NA/NOPB pinout, LM1262NA/NOPB application, or LM1262NA/NOPB equivalent, this page delivers verified electrical specifications, I²C register-controlled timing behavior, DAC output voltage ranges, video bandwidth and linearity data, and precise thermal and supply current metrics under defined test conditions.
Technical Context
The LM1262NA/NOPB implements a fully integrated CMOS RGB pre-amp architecture with independent 7-bit contrast and gain registers per channel, synchronous vertical-blank-triggered parameter updates, and hardware-supported black-level clamping via AC-coupled inputs. Its I²C interface controls all analog functions-including DAC outputs, OSD mixing, ABL response, and power-save mode-with register-based configuration of blanking logic, sandcastle detection, and DAC4 brightness scaling.
It features matched 200 MHz −3 dB bandwidth across R/G/B channels, ±0.5 dB gain tracking between amplifiers, 5% DAC linearity, and 1.9 ns rise time. The device operates at 4.75–5.25 V, supports 0–1 VP-P video input, delivers 2 VP-P output, and achieves −70 dB 10 kHz video feedthrough into OSD paths-optimized for coexistence with LM246X driver ICs and LM2479/LM2480 clamp ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Video Bandwidth | 200 MHz (−3 dB), enabling full support for 1600×1200@85 Hz RGB signals without high-frequency roll-off |
| Supply Voltage Range | 4.75 V to 5.25 V - tight tolerance ensures stable gain and black-level accuracy across industrial temperature range |
| Max Supply Current | 230 mA typical at +5 V - defines minimum PSU headroom required for full operation |
| Power Save Mode Current | 45 mA - reduces total system power by 80% while retaining I²C responsiveness and register state |
| Gain Matching | ±0.5 dB absolute match at max gain - critical for color fidelity and uniform CRT beam intensity |
| DAC Output Range | 0.75 V to 4.2 V (mode-dependent) - covers full cathode cut-off and bias adjustment range for LM2479/LM2480 integration |
| Linearity Error | 5% - limits stair-step distortion in multi-level OSD or grayscale ramp applications |
| Rise/Fall Time | 1.9 ns / 2.0 ns - preserves edge integrity in fast-slew video transitions and sync pulses |
Pinout & Package
LM1262NA/NOPB is housed in a 24-lead molded plastic DIP package (NS package code N24D), compatible with standard through-hole PCB assembly and socketing for CRT monitor serviceability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3 (R/G/B OSD In) | OSD pixel enable inputs | TTL/CMOS logic inputs selecting active OSD overlay per channel; unused pins require 47 kΩ pull-down |
| 4 (OSD Select) | OSD/video multiplexer control | High = OSD path active; low = video path active; enables seamless switching without black-level discontinuity |
| 5–7 (R/G/B Video In) | AC-coupled video inputs | 20 MΩ high-impedance inputs accepting 0–1 VP-P; internal clamp amplifier eliminates need for external DC restoration caps |
| 11 (SDA), 12 (SCL) | I²C bidirectional interface | Standard 100 kHz/400 kHz I²C bus; requires 2 kΩ pull-up and 300 Ω series protection resistors |
| 13–16 (DAC4–DAC1) | 8-bit DAC outputs | Four independent analog outputs; DAC4 modulates DAC1–3 for brightness scaling when configured via Reg 9[4:3] |
| 18–20 (B/G/R Video Out) | Buffered video outputs | Drive-optimized outputs delivering 2 VP-P into LM246X drivers; include H-blank injection and DC offset control |
| 22 (ABL) | Auto Beam Limit input | Voltage-controlled gain reduction input; protects CRT from overcurrent and X-ray emission during high-brightness operation |
| 23 (Clamp Pulse) | DC restoration trigger | Accepts TTL/CMOS clamp pulse (positive/negative edge configurable); initiates black-level correction on AC-coupled inputs |
| 24 (H Flyback) | Horizontal blanking source | Analog flyback input (0–100 V peak); internal circuitry generates precise blanking timing without external logic |
Key Features
| Feature | Design Value |
|---|---|
| I²C-controlled black-level clamping | Eliminates external clamp capacitors and associated board space; maintains stable DC offset across temperature and line rate |
| Synchronous vertical-blank parameter updates | Ensures flicker-free contrast/brightness changes by restricting register writes to vertical retrace period |
| Four 8-bit external DACs with brightness scaling | Enables software-configurable cathode bias and G1 voltage control; DAC4 dynamically adjusts DAC1–3 outputs for unified brightness tuning |
| Integrated OSD mixer with feedthrough suppression | −70 dB 10 kHz and −60 dB 10 MHz video feedthrough into OSD path prevents background noise in overlay windows |
| Power Save (Green) Mode | Reduces supply current from 230 mA to 45 mA while preserving register state and I²C responsiveness for rapid wake-up |
| Matched 200 MHz RGB amplifiers | ±0.5 dB gain tracking ensures consistent color balance across full video bandwidth and luminance levels |
Applications
| High-Resolution CRT Monitors | Bus-Controlled OSD Systems |
|---|---|
Use Scenario: 21-inch 1600×1200@85 Hz CRT monitor with on-screen menu navigation and real-time brightness/contrast adjustment. IC Role / Device Role / Timing Role: RGB pre-amplifier and OSD mixer; performs gain control, black-level clamping, and I²C-synchronized parameter updates during vertical blanking. Use Value: Enables flicker-free OSD overlays and smooth analog adjustments without frame tearing or DC drift across extended operation. | Use Scenario: Industrial diagnostic display requiring dynamic text overlays (temperature, status codes) superimposed on live video feeds. IC Role / Device Role / Timing Role: Digital-analog video compositor; accepts TTL OSD inputs and blends them with analog RGB using register-controlled contrast and black-level matching. Use Value: Delivers −70 dB video feedthrough into OSD path, preventing background noise contamination in critical overlay regions. |
| CRT Driver Interface Optimization | ABL-Protected Display Systems |
Use Scenario: High-gain CRT driver stage using LM246X family, requiring precise DC offset and gain matching at pre-driver input. IC Role / Device Role / Timing Role: Signal conditioner and level shifter; provides 2 VP-P output, 1.25 V default black level, and matched gain to LM246X input requirements. Use Value: Eliminates inter-stage coupling capacitors and manual trim pots; reduces BOM count and calibration labor in volume production. | Use Scenario: Medical imaging CRT display where beam current must be strictly limited to prevent X-ray emission and tube degradation. IC Role / Device Role / Timing Role: ABL feedback controller; monitors EHT-derived current via pin 22 and attenuates all three video channels identically when threshold exceeded. Use Value: Provides hardware-enforced beam current limiting with no firmware dependency-ensuring regulatory compliance and long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGB video pre-amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM1263NA/NOPB | Same pinout and core architecture; adds dedicated horizontal sync input and enhanced sandcastle detection logic | Required for systems using Philips deflection controllers with non-standard sandcastle timing | Select when tighter sandcastle pulse tolerance or HSYNC input routing is needed; otherwise LM1262NA/NOPB suffices |
| THS7314DR | 3-channel 200 MHz video amplifier with fixed gain and no integrated DACs, OSD, or I²C interface | Used in cost-sensitive designs where digital control is handled externally and ABL/clamp functions are omitted | Choose when only analog amplification is required and system MCU handles all parameter control externally |
Compared with LM1262NA/NOPB, LM1263NA/NOPB extends sandcastle compatibility but offers no performance gain in bandwidth or linearity, while THS7314DR removes digital control entirely-making it suitable only for simplified analog-only signal chains without OSD or closed-loop ABL.
Availability
LM1262NA/NOPB is available at Aetrix Electronics and suitable for high-resolution CRT monitor design, bus-controlled OSD implementation, and ABL-protected display systems requiring stable component supply and long-lifecycle support.
Supply support for LM1262NA/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments acquired National Semiconductor in 2011 and maintains full technical documentation and legacy product support for the LM1262NA/NOPB.
This device belongs to TI's legacy video interface portfolio, specifically engineered for analog RGB signal conditioning in high-end CRT displays-prioritizing precision DC restoration, I²C configurability, and seamless integration with LM246X driver families.
FAQ
What is the maximum video input frequency supported by the LM1262NA/NOPB?
The LM1262NA/NOPB supports a −3 dB bandwidth of 200 MHz, verified under standard test conditions (TA = 25°C, VCC = +5 V, CL = 5 pF). This allows full fidelity transmission of 1600×1200@85 Hz RGB signals with minimal high-frequency attenuation. Performance remains within specification up to the 200 MHz corner, beyond which amplitude roll-off begins.
Does the LM1262NA/NOPB require external clamp capacitors for DC restoration?
No, the LM1262NA/NOPB performs black-level clamping directly on its AC-coupled video inputs (pins 5–7) using an internal clamp DC restore amplifier. When a valid clamp pulse is applied to pin 23, the IC charges the external AC coupling capacitor to the correct reference voltage-eliminating the need for additional clamp capacitors and reducing PCB footprint and component count.
How does the LM1262NA/NOPB implement power-saving functionality?
The LM1262NA/NOPB offers two Power Save modes controlled via Register 9. Setting bit 0 blanks the video output; setting both bits 0 and 1 disables the output buffer stage, reducing supply current from 230 mA to 45 mA-a sustained 80% reduction. The 5 V supply must remain active to retain I²C register state and enable rapid wake-up without reinitialization.
Can the LM1262NA/NOPB generate vertical blanking internally?
The LM1262NA/NOPB does not generate vertical blanking internally but detects and synchronizes to it via pin 13 (logic-level VBLANK) or pin 23 (sandcastle pulse), depending on Register 0B configuration. When enabled, vertical blanking triggers synchronous updates of contrast and DAC4 registers-ensuring all parameter changes occur only during vertical retrace to prevent visual artifacts.
What is the purpose of pin 10 (VrefRext) on the LM1262NA/NOPB?
Pin 10 (VrefRext) sets the internal reference current for the LM1262NA/NOPB's precision voltage reference block using an external 10 kΩ ±1% resistor. This resistor determines VRef accuracy across temperature; deviation causes proportional error in DAC outputs, black-level voltage, and ABL threshold. Routing high-frequency signals near pin 10 must be avoided due to its high input impedance and sensitivity to noise.
LM1262NA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Amplifier
- Applications:
- Consumer Video
- Standards:
- -
- Control Interface:
- I2C
- Voltage - Supply:
- 4.75V ~ 5.25V
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-DIP
LM1262NA/NOPB FAQ
1.How can I place an order for LM1262NA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM1262NA/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM1262NA/NOPB reliable?
The price and inventory of LM1262NA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM1262NA/NOPB is usually 5 days.
3.What payment methods are accepted for LM1262NA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM1262NA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM1262NA/NOPB?
LM1262NA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM1262NA/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM1262NA/NOPB?
For technical support, including LM1262NA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM1262NA/NOPB requirements.
6.How does Aetrix verify that LM1262NA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM1262NA/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM1262NA/NOPB meets industry standards.
7.What is the process for return or replacement of LM1262NA/NOPB?
All LM1262NA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM1262NA/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM1262NA/NOPB part is unused and in its original packaging.
Return procedure for LM1262NA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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