BUF08821 8-CH Gamma-Voltage Generator and Vcom Calibrator with Integrated Two-Bank Memory | TI.com

BUF08821 (ACTIVE)

8-CH Gamma-Voltage Generator and Vcom Calibrator with Integrated Two-Bank Memory

 

Description

The BUF08821 offers eight programmable gamma channels plus one programmable VCOM channel.

The final gamma and VCOM values can be stored in the on-chip, nonvolatile memory. To allow for programming errors or liquid crystal display (LCD) panel rework, the BUF08821 supports up to 16 write operations to the on-chip memory.

The BUF08821 has two separate memory banks, allowing simultaneous storage of two different gamma curves to facilitate switching between gamma curves.

All gamma and VCOM channels offer a rail-to-rail output that typically swings to within 150mV of either supply rail with a 10mA load. All channels are programmed using an I2C interface that supports standard operations up to 400kHz and high-speed data transfers up to 3.4MHz.

The BUF08821 is manufactured using Texas Instruments’ proprietary, state-of-the-art, high-voltage CMOS process. This process offers very dense logic and HIGH supply voltage operation of up to 20V. The BUF08821 is offered in a HTSSOP-20 PowerPAD package. It is specified from –40°C to +85°C.

Features

  • 10-BIT RESOLUTION
  • 8-CHANNEL P-GAMMA
  • 1-CHANNEL P-VCOM
  • 16x REWRITABLE NONVOLATILE MEMORY
  • TWO INDEPENDENT PIN-SELECTABLE MEMORY BANKS
  • RAIL-TO-RAIL OUTPUT:
    300mV Minimum Swing-to-Rail (10mA)
    > 300mA Maximum IOUT
  • LOW SUPPLY CURRENT
  • SUPPLY VOLTAGE: 9V to 20V
  • DIGITAL SUPPLY: 2V to 5.5V
  • I2C INTERFACE: Supports 400kHz and 3.4MHz Clock Frequency
  • APPLICATIONS
    • TFT-LCD REFERENCE DRIVERS

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Parametrics Compare all products in LCD & OLED display power & drivers

 
Display type
IC integration
Vin (Min) (V)
Vin (Max) (V)
Source Driver Voltage (Min) (V)
Source Driver Voltage (Max) (V)
Level shifter/scan driver (ch)
Special Function
Topology
Type
Rating
Package size: mm2:W x L (PKG)
Package Group
BUF08821 BUF08630 BUF08832 BUF12800 BUF12840 BUF16821 BUF16821-Q1 BUF18830 BUF20800 BUF20800-Q1 BUF22821
LCD Unipolar     LCD Unipolar     LCD Unipolar     LCD Unipolar     LCD Unipolar     LCD Unipolar     Automotive
LCD Unipolar    
LCD Unipolar     LCD Unipolar     Automotive
LCD Bipolar
LCD Unipolar    
LCD Unipolar    
Gamma Buffer
VCOM    
Gamma Buffer
VCOM    
Gamma Buffer
VCOM    
Gamma Buffer     Gamma Buffer     Gamma Buffer
VCOM    
Gamma Buffer
VCOM    
Gamma Buffer
VCOM    
Gamma Buffer
VCOM    
Gamma Buffer
VCOM    
Gamma Buffer
VCOM    
9     9     9     7     9     9     9     6.5     7     7     9    
20     20     20     18     20     20     20     20     18     18     20    
9     9     9     7     9     9     9     6.5     7     7     9    
20     20     20     18     20     20     20     20     18     18     20    
0     0     0     0     0     0     0     0     0     0     0    
VCOM/OpAmp
I2C I/F
Gamma Buffer    
VCOM/OpAmp
I2C I/F
Gamma Buffer    
VCOM/OpAmp
I2C I/F
Gamma Buffer    
I2C I/F
Gamma Buffer    
I2C I/F
Gamma Buffer    
VCOM/OpAmp
I2C I/F
Gamma Buffer    
VCOM/OpAmp
I2C I/F
Gamma Buffer    
VCOM/OpAmp
I2C I/F
Gamma Buffer    
VCOM/OpAmp
I2C I/F
Gamma Buffer    
VCOM/OpAmp
I2C I/F
Gamma Buffer    
VCOM/OpAmp
I2C I/F
Gamma Buffer    
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
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20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     20VQFN: 25 mm2: 5 x 5 (VQFN | 20)     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     24HTSSOP: 50 mm2: 6.4 x 7.8 (HTSSOP | 24)     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)     28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)