BUF12840 12-CH Gamma Voltage Generator with Dual Memory Banks and EEPROM Access | TI.com

BUF12840 (ACTIVE) 12-CH Gamma Voltage Generator with Dual Memory Banks and EEPROM Access

 

Description

The BUF12840 offers 12 programmable gamma channels with external electrically erasable programmable read-only memory (EEPROM) read capabilities.

The BUF12840 has two separate memory banks that allow simultaneous storage of two different gamma curves to facilitate switching between gamma curves.

All gamma channels offer a rail-to-rail output that typically swings to within 200mV of either supply rail with a 5mA load. All channels are programmed using a two-wire interface that supports standard operations up to 400kHz and high-speed data transfers up to 3.4MHz.

The BUF12840 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 BUF12840 is offered in a QFN-24 package, and is specified from –40°C to +95°C.

Features

  • 10-BIT RESOLUTION
  • 12-CHANNEL P-GAMMA
  • READS FROM EXTERNAL EEPROM
  • TWO INDEPENDENT PIN-SELECTABLE MEMORY BANKS
  • RAIL-TO-RAIL OUTPUT:
    • 300mV Min Swing-to-Rail (10mA)
    • 200mV Min Swing-to-Rail (5mA)
  • LOW SUPPLY CURRENT
  • SUPPLY VOLTAGE: 9V to 20V
  • DIGITAL SUPPLY: 2V to 5.5V
  • TWO-WIRE INTERFACE: Supports 400kHz and 3.4MHz Operation
  • APPLICATIONS
    • TFT-LCD REFERENCE DRIVERS

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Parametrics

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Part number Order 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
BUF12840 Order now LCD Unipolar     Gamma Buffer     9     20     9     20     0     I2C I/F
Gamma Buffer    
   
   
Catalog     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     VQFN | 24    
BUF08630 Order now LCD Unipolar     Gamma Buffer
VCOM    
9     20     9     20     0     VCOM/OpAmp
I2C I/F
Gamma Buffer    
   
   
Catalog     20VQFN: 25 mm2: 5 x 5 (VQFN | 20)     VQFN | 20    
BUF08821 Order now LCD Unipolar     Gamma Buffer
VCOM    
9     20     9     20     0     VCOM/OpAmp
I2C I/F
Gamma Buffer    
   
   
Catalog     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     HTSSOP | 20    
BUF08832 Samples not available LCD Unipolar     Gamma Buffer
VCOM    
9     20     9     20     0     VCOM/OpAmp
I2C I/F
Gamma Buffer    
   
   
Catalog     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     HTSSOP | 20    
BUF12800 Samples not available LCD Unipolar     Gamma Buffer     7     18     7     18     0     I2C I/F
Gamma Buffer    
   
   
Catalog     24HTSSOP: 34 mm2: 4.4 x 7.8 (HTSSOP | 24)     HTSSOP | 24    
BUF16821 Samples not available LCD Unipolar     Gamma Buffer
VCOM    
9     20     9     20     0     VCOM/OpAmp
I2C I/F
Gamma Buffer    
   
   
Catalog     28HTSSOP: 43 mm2: 4.4 x 9.7 (HTSSOP | 28)     HTSSOP | 28    
BUF16821-Q1 Order now Automotive
LCD Unipolar    
Gamma Buffer
VCOM    
9     20     9