My Inquiry
My Account
Texas Instruments BUF12840AIRGET
- Part No.:
- BUF12840AIRGET
- Manufacturer:
- Texas Instruments
- Category:
- Video Amps and Modules
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
BUF12840AIRGET.pdf
- Description:
- IC AMP TFT-LCD 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:459
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BUF12840AIRGET 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. It delivers precise TFT-LCD reference voltages for dynamic gamma curve switching in display timing controllers.
For engineers reviewing the BUF12840AIRGET datasheet, BUF12840AIRGET pinout, BUF12840AIRGET application, or BUF12840AIRGET equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-ready procurement details - all grounded in TI's SBOS519A datasheet and QFN-24 package documentation.
Technical Context
The BUF12840AIRGET implements a double-buffered 10-bit DAC architecture with two independently selectable memory banks (BANK0/BANK1), enabling instantaneous gamma curve switching via BKSEL pin control or software-triggered acquisition. Its analog outputs drive high-impedance LCD source driver inputs with ±200 mV rail-to-rail swing at 5 mA load and ±50 mV output accuracy at mid-scale.
It operates with separate analog (9–20 V) and digital (2–5.5 V) supplies, communicates via I²C-compatible two-wire interface (400 kHz fast mode / 3.4 MHz high-speed mode), and supports external EEPROM auto-read on power-up when EN = 1 - with configurable EA0/EA1 addressing for 1k–256k EEPROMs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 12 independent gamma voltage outputs (OUT0–OUT11) |
| DAC resolution | 10-bit (0–1023 code range); enables 1024-step gamma gradation |
| Analog supply range | 9 V to 20 V - powers high-voltage LCD bias rails directly |
| Digital supply range | 2 V to 5.5 V - compatible with 3.3 V or 5 V logic domains |
| Rail-to-rail swing | ≤200 mV from rail at 5 mA load - ensures full dynamic range for TFT VGH/VGL references |
| Two-wire speed | Up to 3.4 MHz (high-speed mode) - reduces gamma update latency in fast-refresh displays |
| Memory banks | Two pin-selectable banks (BKSEL) - allows seamless A/B gamma switching without host intervention |
| EEPROM support | External EEPROM auto-read on POR with EA0/EA1 address selection - enables factory-programmed gamma curves |
Pinout & Package
BUF12840AIRGET is housed in a 4 mm × 4 mm VQFN-24 package (RGE) with exposed thermal pad. GNDA and GNDD must be connected together and tied to system ground. VS supplies analog circuitry; VSD powers digital logic; LD controls synchronous DAC output update; BKSEL selects active memory bank.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT11 | Analog DAC outputs | 12 rail-to-rail gamma reference voltages; each drives one LCD source driver channel |
| VS | Analog supply input | 9–20 V main analog rail; powers output buffers and internal DAC core |
| VSD | Digital supply input | 2–5.5 V logic supply; must be applied before VS to prevent latch-up |
| SCL / SDA | Two-wire interface clock/data | I²C-compatible bus; supports 400 kHz fast mode and 3.4 MHz high-speed mode |
| BKSEL | Bank select input | Low = BANK0 active; High = BANK1 active - enables instant gamma curve swap |
| LD | Latch enable | Low pulse transfers data from register bank to DAC outputs synchronously |
| EN | EEPROM enable | High at POR triggers auto-read from external EEPROM; low skips master mode |
| EA0 / EA1 | EEPROM address bits | Select EEPROM size and start/end addresses per Table 4 (SBOS519A) |
| A0 | Slave address LSB | Configures I²C address: 74h (A0 = 0) or 75h (A0 = 1) |
Key Features
| Feature | Design Value |
|---|---|
| Dual memory banks | Simultaneous storage of two gamma curves; BKSEL pin enables sub-microsecond switching |
| Rail-to-rail output drive | 200 mV min swing-to-rail at 5 mA - preserves full gamma voltage range across full LCD panel brightness |
| High-speed two-wire interface | 3.4 MHz operation - cuts gamma reprogramming time by >8× vs standard I²C (100 kHz) |
| EEPROM auto-read on POR | Self-initializes gamma values from external EEPROM within 10 ms - eliminates host firmware dependency |
| Double-buffered DAC registers | LD pin enables atomic, glitch-free update of all 12 outputs - prevents transient gamma distortion during refresh |
| Thermal-enhanced QFN | VQFN-24 with exposed thermal pad - supports 125°C junction temperature in high-power display applications |
Applications
| TFT-LCD Gamma Calibration | Dynamic Gamma Switching |
|---|---|
|
Use Scenario: Factory calibration of 10-bit gamma reference voltages for 4K UHD LCD panels using automated test equipment. IC Role / Device Role / Timing Role: Programmable gamma-voltage generator providing 12 precision analog references synchronized to display timing controller. Use Value: Eliminates manual potentiometer tuning; achieves ±20 mV output accuracy and <0.3 LSB INL across –40°C to +95°C. |
Use Scenario: Real-time gamma adjustment in automotive infotainment displays based on ambient light sensor input. IC Role / Device Role / Timing Role: Dual-bank gamma buffer enabling zero-latency switch between daylight and night-mode gamma curves. Use Value: BKSEL-driven bank swap completes in ≤10 μs - no frame tearing or visual artifacts during transition. |
| Industrial HMI Display Tuning | Medical Imaging Reference Stability |
|
Use Scenario: Field-upgradable gamma profiles in industrial HMIs where display performance degrades over time. IC Role / Device Role / Timing Role: EEPROM-backed gamma generator allowing remote reprogramming via two-wire interface. Use Value: External EEPROM stores multiple gamma sets; RA command reloads new curves without power cycle or host reset. |
Use Scenario: DICOM-compliant grayscale rendering in diagnostic monitors requiring stable gamma tracking over 10-year lifespan. IC Role / Device Role / Timing Role: Precision analog reference IC delivering <±25 μV/°C drift and <0.3 LSB DNL for clinical-grade luminance linearity. Use Value: Integral nonlinearity ≤0.3 LSB ensures ΔE < 2 across entire grayscale - meets FDA imaging accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gamma correction buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BUF12800IRGET | No external EEPROM auto-read; single memory bank; same 12-channel/10-bit architecture and QFN-24 package | Lacks dynamic gamma switching and factory-programmable startup - requires host-initiated gamma loading | Choose when cost sensitivity outweighs need for EEPROM-based initialization or dual-bank flexibility |
| BUF22821IRHFT | 22-channel, 10-bit gamma buffer; no dual-bank memory; supports 3.4 MHz I²C but lacks BKSEL/LD synchronization | Higher channel count for larger panels; no hardware-accelerated gamma switching - relies on software register updates | Prefer for ultra-high-resolution displays needing >12 references, where simultaneous update is managed by host processor |
Compared with BUF12840AIRGET, BUF12800IRGET removes EEPROM dependency and bank switching but retains identical analog performance and footprint; BUF22821IRHFT expands channel count at the expense of deterministic multi-channel update timing and hardware bank selection.
Availability
BUF12840AIRGET is available at Aetrix Electronics and suitable for TFT-LCD reference drivers, industrial HMI display calibration, and medical imaging grayscale stability applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BUF12840AIRGET 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 silicon solutions for industrial, automotive, and consumer systems.
BUF12840AIRGET belongs to TI's display interface and gamma correction product line, engineered specifically for high-accuracy, multi-channel analog voltage generation in LCD timing controller ecosystems.
FAQ
What is the function of the BKSEL pin on the BUF12840AIRGET?
The BKSEL pin selects between two independent gamma memory banks: low selects BANK0, high selects BANK1. This enables instantaneous hardware-switched gamma curve changes without host CPU involvement. The BUF12840AIRGET uses BKSEL state at LD activation to determine which bank's data transfers to the DAC outputs - critical for flicker-free transitions in adaptive brightness systems.
Does the BUF12840AIRGET require an external EEPROM to operate?
No - the BUF12840AIRGET operates without external EEPROM. When EN = 0 at power-on, it skips EEPROM auto-read and enters slave mode immediately. External EEPROM is optional and used only for factory-programmed gamma initialization; all configuration and updates can be performed dynamically via the two-wire interface during normal operation of the BUF12840AIRGET.
What is the maximum output current per channel for the BUF12840AIRGET?
The BUF12840AIRGET supports continuous output current up to 30 mA per channel, with rail-to-rail swing specified at 5 mA (≤200 mV from rail) and 10 mA (≤300 mV from rail). This drive strength accommodates typical LCD source driver input capacitance and leakage while maintaining gamma linearity - confirmed in Electrical Characteristics Table (SBOS519A, p.3).
How does the LD pin control output updates on the BUF12840AIRGET?
The LD (latch) pin enables synchronous, glitch-free updating of all 12 DAC outputs. When LD transitions low, the BUF12840AIRGET transfers data from the selected memory bank (determined by BKSEL) into the DAC output stage simultaneously. This atomic update prevents transient voltage mismatches across gamma channels - essential for artifact-free display refresh in the BUF12840AIRGET.
Can the BUF12840AIRGET operate with a 3.3 V digital supply?
Yes - the BUF12840AIRGET supports digital supply voltages from 2.0 V to 5.5 V, making 3.3 V fully compliant. VIH is defined as 0.7 × VSD (≥2.31 V at 3.3 V), and VOL is ≤0.4 V at 3 mA sink - ensuring robust noise margins with standard 3.3 V microcontrollers and FPGAs interfacing to the BUF12840AIRGET.
BUF12840AIRGET 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)
BUF12840AIRGET FAQ
1.How can I place an order for BUF12840AIRGET through Aetrix?
Please submit a Request for Quotation (RFQ) for BUF12840AIRGET 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 BUF12840AIRGET reliable?
The price and inventory of BUF12840AIRGET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUF12840AIRGET is usually 5 days.
3.What payment methods are accepted for BUF12840AIRGET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUF12840AIRGET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUF12840AIRGET?
BUF12840AIRGET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUF12840AIRGET 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 BUF12840AIRGET?
For technical support, including BUF12840AIRGET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUF12840AIRGET requirements.
6.How does Aetrix verify that BUF12840AIRGET is sourced from the original manufacturer or authorized distributors?
All BUF12840AIRGET 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 BUF12840AIRGET meets industry standards.
7.What is the process for return or replacement of BUF12840AIRGET?
All BUF12840AIRGET units undergo pre-shipment inspection (PSI). If there is an issue with BUF12840AIRGET, 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 BUF12840AIRGET part is unused and in its original packaging.
Return procedure for BUF12840AIRGET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BUF12840AIRGET Tags
-
LT6552CS8#PBF
Analog Devices Inc.
-
LT6205IS5#TRPBF
Analog Devices Inc.
-
LT6206IMS8#TRPBF
Analog Devices Inc.
-
LT6552CDD#PBF
Analog Devices Inc.
-
LT6552IS8#PBF
Analog Devices Inc.
-
LT1252CS8#PBF
Analog Devices Inc.
-
AD818ARZ-REEL7
Analog Devices Inc.
-
MAX4310EUA+
Analog Devices Inc./Maxim Integrated
-
AD829ARZ
Analog Devices Inc.
-
AD810ARZ
Analog Devices Inc.
-
MAX4310ESA+
Analog Devices Inc./Maxim Integrated
-
MAX4313ESA+
Analog Devices Inc./Maxim Integrated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
