BUF16821

Features:

` 10-BIT RESOLUTION
` 16-CHANNEL P-GAMMA
` 2-CHANNEL P-V<sub>COM</sub>
` 16x REWRITABLE NONVOLATILE MEMORY
` TWO INDEPENDENT PIN-SELECTABLE MEMORY BANKS
` RAIL-TO-RAIL OUTPUT
300mV Min Swing-to-Rail (10mA)
> 300mA Max IOUT
` LOW SUPPLY CURRENT
` SUPPLY VOLTAGE: 9V to 20V
` DIGITAL SUPPLY: 2V to 5.5V
` I²C™ INTERFACE: Supports 400kHz and 3.4MHz


Application

· TFT-LCD REFERENCE DRIVERS


Pinout




Specifications

PARAMETER		BUF16821	UNIT
Supply Voltage                                                                      VS		+22	V
Supply Voltage                                                                    VSD		+6	V
Digital Input Pins, SCL, SDA, AO, BKSEL: Voltage		0.5 to +6	V
Digital Input Pins, SCL, SDA, AO, BKSEL: Current		±10	mA
Output Pins, OUT1 through OUT16, VCOM1 and VCOM2(2)		(V) 0.5 to (V+) + 0.5	V
Output Short-Circuit(3)		Continuous
Ambient Operating Temperature		40 to +95
Ambient Storage Temperature		65 to +150
Junction Temperature                                                          TJ		+125
ESD Rating	Human Body Model      (HBM)	3000	V
	Charged Device Model  (CDM)	1000	V
	Machine Model             (MM)	200	V

(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not supported.
(2) See the Output Protection section.
(3) Short-circuit to ground, one amplifier per package.


Description

The BUF16821 offers 16 programmable gamma channels and two programmable V_COM channels.The final gamma and V_COM values can be stored in the on-chip, nonvolatile memory. To allow forppraongerlarmewmoinrkg, tehreroBrsUFor16l8iq2u1idsucprypsotratsl duipsptolay16(LwCrDite operations to the on-chip memory.

The BUF16821 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 eithersupply 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 BUF16821 is manufactured using

TexasICnMstOruSmepnrotsc'epssro.pTrhieistarpyr,ocsetastse-oofff-ethrse-vaertr,yhdigehn-sveolltoaggiec and high supply voltage operation of up to 20V. The BUF16821 is offered in a HTSSOP-28 PowerPAD™package, and is specified from 40 to +85.