My Inquiry
My Account
Texas Instruments BUF08821AIPWPR
- Part No.:
- BUF08821AIPWPR
- Manufacturer:
- Texas Instruments
- Category:
- Video Amps and Modules
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BUF08821AIPWPR.pdf
- Description:
- IC AMP TFT-LCD 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,019
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BUF08821AIPWPR from Texas Instruments is a programmable gamma-voltage generator and VCOM calibrator IC for TFT-LCD timing control, featuring eight 10-bit gamma channels (OUT1–OUT8), one 10-bit VCOM channel, rail-to-rail analog output swing (≤150 mV from rails at 10 mA), dual independent nonvolatile memory banks (16 write cycles each), and I²C interface supporting up to 3.4 MHz. It operates from 9V to 20V analog supply and 2.0V to 5.5V digital supply.
For engineers reviewing the BUF08821AIPWPR datasheet, BUF08821AIPWPR pinout, BUF08821AIPWPR application, or BUF08821AIPWPR equivalent, this page delivers verified technical context, exact pin functions, real-world LCD panel calibration use cases, confirmed alternative parts with functional distinctions, and supply-chain support details specific to industrial TFT-LCD reference driver design.
Technical Context
The BUF08821AIPWPR integrates two independent 16-word nonvolatile memory banks (BANK0/BANK1), enabling dynamic gamma curve switching via BKSEL pin in <10 μs. Each DAC channel uses double-buffered registers to decouple volatile programming from output update timing.
All nine analog outputs (OUT1–OUT8 + VCOM) are rail-to-rail capable, delivering ≥300 mA peak VCOM drive (BUF08821A variant), ±50 mV output accuracy, and 0.3 LSB integral nonlinearity. Programming occurs over I²C with standard (400 kHz), fast, and high-speed (3.4 MHz) modes - no external configuration pins required beyond A0 and BKSEL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit DAC resolution enables 1024-step gamma voltage granularity for precise grayscale tuning. |
| Analog Supply Range | 9V to 20V supports direct connection to LCD panel high-voltage rails without external regulators. |
| Digital Supply Range | 2.0V to 5.5V logic compatibility covers 3.3V and 5V microcontrollers and timing controllers. |
| I²C Speed Support | Up to 3.4 MHz high-speed mode allows full 9-channel programming in <1 ms for production calibration. |
| Output Swing (OUT1–OUT8) | Within 150 mV of VS or GND at 10 mA load ensures full-scale gamma voltage fidelity across temperature. |
| VCOM Drive Capability | ≥300 mA continuous output current meets high-capacitance TFT-LCD VCOM node requirements. |
| OTP Memory Endurance | 16 guaranteed write cycles per memory word supports factory rework and panel-specific tuning iterations. |
| Operating Temperature | –40°C to +85°C ambient rating qualifies for industrial and automotive display module environments. |
Pinout & Package
BUF08821AIPWPR is housed in an HTSSOP-20 PowerPAD™ package (PWP), thermally enhanced with exposed thermal pad for high-current VCOM operation. Pin 1 is VCOM; pins 6 and 15 are tied to VS; pins 7 and 13 are GNDA/GNDD (must be connected together); pin 20 is NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCOM (Pin 1) | VCOM calibration output | High-current (≥300 mA) rail-to-rail analog output for LCD common electrode biasing. |
| OUT1–OUT8 (Pins 2–5, 14, 17–19) | Gamma reference outputs | Eight 10-bit programmable voltage references driving source driver gamma inputs. |
| VS (Pins 6, 15) | Analog supply input | Primary high-voltage rail (9–20 V) powering all analog output stages and internal references. |
| GNDA/GNDD (Pins 7, 13) | Analog/digital ground | Separate but mandatory shorted ground nets to minimize noise coupling between analog and digital domains. |
| VSD (Pin 8) | Digital supply input | Logic supply (2.0–5.5 V) for I²C interface, memory control, and register logic - must power up before VS. |
| SCL/SDA (Pins 9–10) | I²C interface | Open-drain bus lines requiring external pull-ups; support 3.4 MHz high-speed mode for rapid calibration. |
| A0 (Pin 11) | I²C address select | Configures slave address as 0x74 (A0 = LOW) or 0x75 (A0 = HIGH) for multi-device bus topology. |
| BKSEL (Pin 12) | Memory bank selector | Hardware-selectable switch between BANK0 and BANK1 for instant gamma curve swapping (<10 μs). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent OTP memory banks | Enables field-updatable gamma curves without firmware changes - BANK0/BANK1 selectable via BKSEL pin. |
| Rail-to-rail analog output stage | Guarantees ≤150 mV headroom to VS/GND at 10 mA, preserving full gamma voltage range across process/voltage/temperature. |
| Integrated parity error correction | Single-bit error detection/correction on OTP memory prevents corrupted gamma values from propagating to display output. |
| Double-buffered DAC registers | Decouples register writes from output updates - eliminates visual artifacts during live gamma reprogramming. |
| 16-cycle OTP endurance | Supports repeated factory calibration, panel rework, and end-of-line tuning without memory wear-out concerns. |
| Thermal-enhanced HTSSOP-20 PowerPAD™ | θJA = 40°C/W with PCB thermal pad ensures stable operation under sustained 300 mA VCOM load. |
Applications
| TFT-LCD Gamma Calibration | VCOM Voltage Optimization |
|---|---|
|
Use Scenario: Factory calibration of 10-bit gamma voltage ladder for 10.1" industrial TFT-LCD panel with 1920×1200 resolution. IC Role / Device Role / Timing Role: Programmable gamma reference generator providing eight precision analog voltages to source driver ICs. Use Value: Eliminates external resistor ladders and trim-pots; enables software-defined gamma curves stored in on-chip OTP memory. |
Use Scenario: Dynamic VCOM compensation during temperature drift in automotive infotainment display. IC Role / Device Role / Timing Role: High-current VCOM calibrator adjusting common electrode bias in real time based on temperature sensor feedback. Use Value: Maintains image contrast stability across –40°C to +85°C using 10-bit resolution and ≥300 mA drive capability. |
| Multi-Gamma Display Switching | Panel Rework & Calibration |
|
Use Scenario: Consumer tablet switching between sRGB and Adobe RGB color gamuts via user setting. IC Role / Device Role / Timing Role: Dual-bank gamma generator selecting pre-stored gamma curves using BKSEL pin toggle. Use Value: Achieves <10 μs gamma transition without frame tearing or visible flicker during color mode change. |
Use Scenario: Repair station reprogramming gamma settings for returned LCD modules with inconsistent grayscale. IC Role / Device Role / Timing Role: Field-programmable reference driver with 16 OTP write cycles per channel for iterative tuning. Use Value: Reduces rework time by 70% versus manual resistor replacement; traceable calibration history via MaxBank register. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TFT-LCD reference driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BUF16821 | 16-channel gamma buffer (no VCOM channel); same 10-bit resolution and dual-bank OTP memory. | Requires external VCOM driver IC; suited for panels needing >8 gamma references but separate VCOM control. | Select when system architecture separates gamma and VCOM functions or requires higher channel count. |
| BUF20820 | 18-/20-channel programmable buffer with memory; supports 20V analog supply but lacks integrated VCOM calibrator. | Targeted at large-format displays (e.g., 27" monitors); no on-chip VCOM output - relies on discrete VCOM solution. | Choose for high-resolution desktop monitors where gamma channel count exceeds eight and VCOM is handled externally. |
Compared with BUF16821 and BUF20820, the BUF08821AIPWPR uniquely integrates both 8-channel gamma generation and high-current VCOM calibration in a single HTSSOP-20 package - reducing BOM count, PCB area, and calibration complexity for mid-size industrial and automotive TFT-LCDs.
Availability
BUF08821AIPWPR is available at Aetrix Electronics and suitable for TFT-LCD reference drivers, industrial display calibration systems, and automotive infotainment modules requiring stable component supply, long-term lifecycle support, and guaranteed OTP memory reliability.
Supply support for BUF08821AIPWPR 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 for industrial, automotive, and consumer applications.
The BUF08821AIPWPR belongs to TI's LCD timing and reference driver product line, designed specifically to replace discrete resistor ladders and op-amp-based gamma/VCOM solutions in cost-sensitive, space-constrained TFT-LCD modules.
FAQ
What is the maximum analog supply voltage for BUF08821AIPWPR?
The BUF08821AIPWPR supports an absolute maximum analog supply voltage (VS) of +22 V, with recommended operating range from 9 V to 20 V. Operation above 20 V risks exceeding specified electrical characteristics and may reduce long-term reliability. The device is rated for continuous operation at 20 V with full 10-bit performance and rail-to-rail output swing.
Does BUF08821AIPWPR support hardware-based gamma curve switching?
Yes, BUF08821AIPWPR supports hardware-based gamma curve switching via the BKSEL pin. When BKSEL is driven LOW, BANK0 is selected; when driven HIGH, BANK1 is selected. Switching occurs in <10 μs with simultaneous update of all nine outputs (OUT1–OUT8 + VCOM), enabling flicker-free transitions between calibrated gamma profiles in real time.
How many times can the nonvolatile memory in BUF08821AIPWPR be rewritten?
The nonvolatile memory in BUF08821AIPWPR supports exactly 16 guaranteed write cycles per memory word across both BANK0 and BANK1. This is sufficient for factory calibration, panel rework, and final-line tuning. Memory retention is rated for 100 years at +85°C, and each write cycle is tracked per channel via the read-only MaxBank register.
What is the function of the A0 pin on BUF08821AIPWPR?
The A0 pin on BUF08821AIPWPR sets the I²C slave address: LOW configures address 0x74 (1110100), HIGH configures address 0x75 (1110101). This enables two BUF08821AIPWPR devices on the same I²C bus without address conflict. No external pull-up/down is required - A0 is actively driven by the host controller during initialization.
Is BUF08821AIPWPR compatible with 3.3V I²C systems?
Yes, BUF08821AIPWPR is fully compatible with 3.3V I²C systems. Its digital supply (VSD) accepts 2.0V to 5.5V, and its SCL/SDA pins tolerate 0.7 × VSD logic-high threshold (≥2.3V at 3.3V). The open-drain interface requires external 3.3V pull-ups, and the device supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) I²C modes without level-shifting.
BUF08821AIPWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- TFT-LCD Panels: Gamma Buffer, VCOM Driver
- Output Type:
- Rail-to-Rail
- Number of Circuits:
- 8
- -3db Bandwidth:
- -
- Slew Rate:
- -
- Current - Supply:
- 4.6 mA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply, Single/Dual (±):
- 9V ~ 20V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 20-HTSSOP
BUF08821AIPWPR FAQ
1.How can I place an order for BUF08821AIPWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for BUF08821AIPWPR 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 BUF08821AIPWPR reliable?
The price and inventory of BUF08821AIPWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUF08821AIPWPR is usually 5 days.
3.What payment methods are accepted for BUF08821AIPWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUF08821AIPWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUF08821AIPWPR?
BUF08821AIPWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUF08821AIPWPR 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 BUF08821AIPWPR?
For technical support, including BUF08821AIPWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUF08821AIPWPR requirements.
6.How does Aetrix verify that BUF08821AIPWPR is sourced from the original manufacturer or authorized distributors?
All BUF08821AIPWPR 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 BUF08821AIPWPR meets industry standards.
7.What is the process for return or replacement of BUF08821AIPWPR?
All BUF08821AIPWPR units undergo pre-shipment inspection (PSI). If there is an issue with BUF08821AIPWPR, 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 BUF08821AIPWPR part is unused and in its original packaging.
Return procedure for BUF08821AIPWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BUF08821AIPWPR 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…
