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Texas Instruments BUF12840AIRGER
- Part No.:
- BUF12840AIRGER
- Manufacturer:
- Texas Instruments
- Category:
- Video Amps and Modules
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
BUF12840AIRGER.pdf
- Description:
- IC AMP TFT-LCD 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,326
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Product details
Overview
BUF12840AIRGER from Texas Instruments is a 12-channel programmable gamma-voltage generator with 10-bit DAC resolution, rail-to-rail analog outputs (±200 mV swing at 5 mA), dual independent memory banks, and integrated two-wire interface supporting up to 3.4 MHz - designed for precision TFT-LCD reference driver applications in industrial display systems.
For engineers reviewing the BUF12840AIRGER datasheet, BUF12840AIRGER pinout, BUF12840AIRGER application, or BUF12840AIRGER equivalent, this page delivers verified technical context, real-world timing behavior, bank-select control logic, EEPROM auto-read sequencing, and design-critical output swing vs. load specifications - all confirmed against TI's SBOS519A revision July 2011 production data.
Technical Context
The BUF12840AIRGER implements a double-buffered 10-bit DAC architecture with two independently selectable memory banks (BANK0/BANK1), controlled via BKSEL pin or software command. Each of its 12 analog outputs drives gamma reference voltages with rail-to-rail capability (VS = 9–20 V, GND-referenced) and supports simultaneous or staggered update modes using LD pin assertion or bit-15 write control.
It operates as a two-wire slave device (I²C-compatible) with standard/fast mode (400 kHz) and high-speed mode (3.4 MHz) support, plus master-mode EEPROM auto-read functionality triggered by EN pin during power-on reset - enabling automatic loading of pre-stored gamma curves from external EEPROM without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 12 independent gamma voltage outputs (OUT0–OUT11) |
| DAC resolution | 10-bit (0–1023 code range; full-scale output = VS × CODE/1024) |
| Analog supply range | 9 V to 20 V - enables direct integration into high-voltage LCD bias rails |
| Digital supply range | 2.0 V to 5.5 V - compatible with 3.3 V or 5 V logic domains |
| Output swing (5 mA) | Min 17.8 V high / 0.2 V low at VS = 18 V - ensures >98% rail utilization under load |
| Two-wire speed | Up to 3.4 MHz (Hs mode) - reduces gamma curve reconfiguration time to <1 ms |
| Memory banks | Two pin-selectable (BKSEL) or software-addressable banks - enables dynamic gamma switching |
| EEPROM auto-read | Enabled by EN = 1 at POR; attempts up to 10× at 71–100 kHz - ensures robust startup loading |
Pinout & Package
BUF12840AIRGER is housed in a 4 mm × 4 mm VQFN-24 package (RGE) with exposed thermal pad for enhanced power dissipation. GNDA and GNDD must be connected together on PCB per TI layout guidance (SLUS271).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT11 | Analog gamma output channels | 12 rail-to-rail buffered DAC outputs; each drives one gamma reference node in TFT column drivers |
| VS | Analog supply input | Primary high-voltage analog rail (9–20 V); powers all 12 output buffers |
| VSD | Digital supply input | Logic supply (2–5.5 V); powers I²C interface, control logic, and EEPROM interface circuitry |
| SCL / SDA | Two-wire serial interface | I²C-compatible bus lines; support standard/fast/high-speed modes up to 3.4 MHz |
| BKSEL | Bank select input | Active-high logic selects BANK1; low selects BANK0 - determines which gamma curve is active |
| LD | Latch enable input | Low pulse updates DAC outputs from register values; high enables double-buffered synchronous update |
| EN | EEPROM enable input | High at POR initiates master-mode EEPROM auto-read; low skips download and enters slave mode directly |
| EA0 / EA1 | EEPROM address select | Configure EEPROM size and start/end addresses per Table 4 - required for correct auto-read mapping |
| A0 | Slave address LSB | Sets I²C address to 0x74 (A0 = 0) or 0x75 (A0 = 1) - enables multi-device bus configuration |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Guaranteed ≤200 mV from rail at 5 mA load - preserves gamma linearity across full voltage range |
| Dual memory banks | Hardware (BKSEL) or software selection between two complete gamma curves - enables real-time display mode switching |
| EEPROM auto-read on POR | Self-contained startup sequence loads gamma data without host CPU involvement - reduces system boot latency |
| Double-buffered DAC registers | Enables glitch-free, synchronized output updates across all 12 channels using LD pin or bit-15 write flag |
| High-speed two-wire interface | 3.4 MHz operation cuts full 12-channel gamma reprogramming time to <1 ms - critical for adaptive brightness control |
| Thermal-enhanced QFN package | VQFN-24 with exposed thermal pad (θJB = 10.0 °C/W) - sustains continuous 30 mA per channel at +95°C ambient |
Applications
| TFT-LCD Gamma Calibration System | Industrial Panel Display Reference Driver |
|---|---|
Use Scenario: Factory calibration station adjusts gamma curves for large-format industrial displays using automated test equipment. IC Role / Device Role / Timing Role: BUF12840AIRGER acts as programmable gamma reference source; receives calibrated DAC codes over I²C and outputs precise analog voltages to column driver ICs. Use Value: Dual memory banks allow storage of factory-default and user-tuned curves; BKSEL toggling enables instant A/B comparison without reprogramming. |
Use Scenario: Embedded display controller in medical imaging panel dynamically adjusts gamma based on ambient light and viewing angle. IC Role / Device Role / Timing Role: BUF12840AIRGER serves as real-time gamma voltage generator; updated via high-speed I²C writes triggered by sensor input. Use Value: 3.4 MHz interface and double-buffered LD control ensure sub-millisecond gamma transitions - eliminates visible stepping artifacts. |
| Automotive Infotainment Display | Public Information Kiosk Display |
Use Scenario: In-vehicle head unit maintains consistent color reproduction across temperature extremes (-40°C to +95°C). IC Role / Device Role / Timing Role: BUF12840AIRGER provides temperature-stable gamma references; internal INL/DNL specs (±0.3 LSB) ensure grayscale fidelity. Use Value: Rail-to-rail output swing (≤200 mV from rail) preserves contrast ratio at low brightness settings - critical for night driving visibility. |
Use Scenario: Outdoor kiosk display adapts gamma for sunlight readability and indoor dimming modes. IC Role / Device Role / Timing Role: BUF12840AIRGER stores two optimized gamma sets (day/night) in separate banks; BKSEL pin toggled by system MCU. Use Value: EEPROM auto-read at power-up ensures reliable gamma restoration after cold restart - no firmware dependency for baseline operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gamma correction buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BUF12800IRGER | No external EEPROM interface; single memory bank; same 12-channel/10-bit architecture and VQFN-24 package | Lacks auto-read and dual-bank switching - requires host MCU to manage gamma storage and updates | Select when system already includes dedicated EEPROM and simpler gamma management suffices |
| BUF20820ARHBT | 20-channel, 10-bit, with integrated memory (no external EEPROM needed); 32-pin VQFN; digital supply up to 5.5 V | Higher channel count but no BKSEL-controlled bank switching; uses internal SRAM instead of EEPROM-based persistence | Select for multi-panel systems needing >12 outputs or where EEPROM reliability is a concern |
Compared with BUF12840AIRGER, BUF12800IRGER removes EEPROM dependency at the cost of runtime flexibility, while BUF20820ARHBT trades bank-select simplicity for higher channel density and internal memory - making BUF12840AIRGER optimal for dual-curve, EEPROM-backed TFT-LCD reference designs requiring deterministic startup behavior.
Availability
BUF12840AIRGER is available at Aetrix Electronics and suitable for TFT-LCD reference driver design, industrial display calibration systems, and automotive infotainment display modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for BUF12840AIRGER 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 is a global semiconductor leader specializing in analog, embedded processing, and high-reliability power solutions - with decades of display interface and precision analog IP.
BUF12840AIRGER belongs to TI's gamma correction buffer product line, engineered specifically for high-accuracy, multi-curve TFT-LCD voltage reference generation in demanding industrial and automotive display applications.
FAQ
What is the function of the BKSEL pin on the BUF12840AIRGER?
The BKSEL pin on the BUF12840AIRGER selects between two independent gamma voltage memory banks: low = BANK0, high = BANK1. This hardware-selectable bank switching enables instantaneous gamma curve changes without I²C reprogramming - essential for dynamic display modes. The BUF12840AIRGER uses BKSEL state during LD pin assertion to determine which bank's values drive the 12 analog outputs.
How does the BUF12840AIRGER perform EEPROM auto-read at power-up?
The BUF12840AIRGER initiates EEPROM auto-read only if EN = 1 within 15 ms of power-on reset (POR). It then attempts up to 10 reads spaced 1 ms apart at 71–100 kHz, loading data into both memory banks. If successful, all 12 DAC outputs update simultaneously post-download. If all attempts fail, the BUF12840AIRGER enters slave mode after 25 ms - ensuring deterministic startup behavior regardless of EEPROM readiness.
What is the maximum load current per channel for the BUF12840AIRGER?
The BUF12840AIRGER supports a continuous output current of ±30 mA per channel (OUT0–OUT11), as specified in its absolute maximum ratings. Electrical characteristics confirm stable rail-to-rail swing (≤200 mV from rail) at 5 mA and ≤300 mV at 10 mA - making it suitable for driving moderate-capacitance LCD column driver inputs without external buffering.
Can the BUF12840AIRGER operate with different analog and digital supply voltages?
Yes - the BUF12840AIRGER requires separate supplies: analog (VS = 9–20 V) powers the 12 gamma output buffers, while digital (VSD = 2.0–5.5 V) powers the two-wire interface, control logic, and EEPROM interface. TI specifies that VSD must be applied before VS to prevent excessive current draw or damage; this sequencing is enforced in typical application circuits (Figure 10).
What timing behavior defines the BUF12840AIRGER's DAC output update?
The BUF12840AIRGER achieves full-scale DAC output transitions in ≤5 μs (typical) when updating registers directly, and ≤7 μs when using BKSEL or LD pin control (Figure 9). These values are measured under VS = 18 V, TA = +25°C, and reflect the device's high-slew-rate output stage - critical for minimizing visual artifacts during gamma curve changes in real-time display systems.
BUF12840AIRGER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 24-VFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- TFT-LCD Panels: VCOM Driver
- Output Type:
- Rail-to-Rail
- Number of Circuits:
- 12
- -3db Bandwidth:
- -
- Slew Rate:
- -
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply, Single/Dual (±):
- 9V ~ 20V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-VQFN (4x4)
BUF12840AIRGER FAQ
1.How can I place an order for BUF12840AIRGER through Aetrix?
Please submit a Request for Quotation (RFQ) for BUF12840AIRGER 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 BUF12840AIRGER reliable?
The price and inventory of BUF12840AIRGER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUF12840AIRGER is usually 5 days.
3.What payment methods are accepted for BUF12840AIRGER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUF12840AIRGER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUF12840AIRGER?
BUF12840AIRGER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUF12840AIRGER 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 BUF12840AIRGER?
For technical support, including BUF12840AIRGER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUF12840AIRGER requirements.
6.How does Aetrix verify that BUF12840AIRGER is sourced from the original manufacturer or authorized distributors?
All BUF12840AIRGER 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 BUF12840AIRGER meets industry standards.
7.What is the process for return or replacement of BUF12840AIRGER?
All BUF12840AIRGER units undergo pre-shipment inspection (PSI). If there is an issue with BUF12840AIRGER, 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 BUF12840AIRGER part is unused and in its original packaging.
Return procedure for BUF12840AIRGER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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