MAX1512ETA+T Datasheet MAX1512ETA+T | P1-P3

General Description

The MAX1512 is a programmable VCOM-adjustment

solution for thin-film transistor (TFT) liquid-crystal displays

(LCDs). The MAX1512 simplifies the labor-intensive

VCOM-adjustment process and replaces mechanical

potentiometers, which significantly reduces labor costs,

increases reliability, and enables automation.

The MAX1512 attaches to an external resistive voltage-

divider and sinks a programmable current to set the

VCOM voltage level. An internal 7-bit digital-to-analog

converter (DAC) controls the sink current. The DAC is

ratiometric relative to AVDD and is guaranteed to be

monotonic over all operating conditions. This VCOM

calibrator IC includes an EEPROM to store the desired

VCOM voltage level. The EEPROM can be programmed

repeatedly, giving TFT LCD manufacturers the flexibility

to calibrate the display panel as many times as the

manufacturing process requires.

The IC features a single-wire interface between the

LCD panel and the programming circuit. The single-

wire interface delivers both programming power and

DAC-adjustment commands to minimize changes to

panel connectors and production equipment. The

MAX1512 is available in an 8-pin 3mm x 3mm TDFN

package. A complete evaluation kit is available to sim-

plify evaluation and production development.

Applications

LCD Panels

Notebook Computers

Monitors

LCD TVs

Features

♦ 7-Bit Adjustable Sink-Current Output

♦ Resistor-Adjustable Full-Scale Range

♦ Guaranteed Monotonic Output Over Operating

Range

♦ Single-Wire Adjustment and Programming*

♦ EEPROM Stores VCOM Setting

♦ Interface Enable/Disable Control (CE)

♦ 2.6V to 3.6V Logic Supply-Voltage Operating

Range (V

)

♦ 4.5V to 20V Analog Supply-Voltage Range (V

AVDD

)

♦ V

UVLO Protection

♦ 8-Pin 3mm x 3mm TDFN (0.8mm max)

MAX1512

EEPROM-Programmable TFT VCOM Calibrator

________________________________________________________________ Maxim Integrated Products 1

CTL

AVDD

SET

OUT

VCOM

SET

GND

AVDD

MAX1512

Pin Configuration

Ordering Information

SET

CTL

GND

N.C.

AVDD

OUT

MAX1512

TDFN

TOP VIEW

A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.

Typical Operating Circuit

19-2911 Rev 3; 8/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE PIN-PACKAGE

MAX1512ETA -40°C to +85°C 8 TDFN 3mm x 3mm

MAX1512ETA+ -40°C to +85°C 8 TDFN 3mm x 3mm

EVALUATION KIT

AVAILABLE

*Patent Pending.

+Denotes lead-free package.

MAX1512

EEPROM-Programmable TFT VCOM Calibrator

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V

= 3V, V

AVDD

= 10V, V

OUT

= 5V, R

SET

= 30.1kΩ, T

= 0°C to +85°C, unless otherwise noted. Typical values

are at T

= +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

, SET, CE to GND...............................................-0.3V to +4V

OUT to GND ...........................................................-0.3V to +14V

AVDD to GND.........................................................-0.3V to +24V

CTL to GND ............................................................-0.3V to +16V

Continuous Power Dissipation (T

= +70°C) ...............................

8-Pin Thin QFN 3mm x 3mm (derate 24.4mW/°C

above +70°C).............................................................1951mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SINK-CURRENT ADJUSTMENT

SET Voltage Resolution 7 Bits

SET Differential Nonlinearity Guaranteed monotonic -1 +1 LSB

SET Zero-Scale Error -1 +1 +2 LSB

SET Full-Scale Error -12 +12 LSB

SET Current I

SET

120 µA

To GND, V

AVDD

= 20V 10 200

SET External Resistance (Note 2) R

SET

To GND, V

AVDD

= 4.5V 2.25 45.00

kΩ

SET

/ V

AVDD

Voltage Ratio DAC full scale 0.05 V/V

SET

/ V

AVDD

Factory-Set Voltage

Ratio

0.024 0.025 0.026 V/V

SUPPLY

Supply Range V

2.6 3.6 V

CE = V

32 55

Supply Current I

CE = GND 12 20

µA

Rising edge 2.2 2.5 2.7

Power-On Reset Threshold

Falling edge 2.1 2.4 2.6

Power-On Reset Hysteresis 100 mV

CONTROL AND PROGRAMMING

CE Input Low Voltage 2.6V < V

< 3.6V 0.4 V

CE Input High Voltage 2.6V < V

< 3.6V 1.6 V

CE Startup Time (Note 3) 1 ms

CTL High Voltage 2.6V < V

< 3.6V 0.70 x V

0.82 x V

CTL Float Voltage 2.6V < V

< 3.6V 0.40 x V

0.62 x V

CTL Low Voltage 2.6V < V

< 3.6V 0.20 x V

0.32 x V

CTL Rejected Pulse Width 20 µs

CTL Minimum Pulse Width 200 µs

CTL Minimum Time Between

Pulses

10 µs

CTL = GND -10

CTL Input Current

CTL = V

µA

MAX1512

EEPROM-Programmable TFT VCOM Calibrator

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS

= 3V, V

AVDD

= 10V, V

OUT

= 5V, R

SET

= 30.1kΩ, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

Note 1: Limits are 100% production tested at T

= +25°C. Limits over the operating temperature range are guaranteed through

correlation using standard quality control (SQC) methods.

Note 2: SET external resistor range is verified at DAC full scale.

Note 3: Guaranteed by design. Not production tested.

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

= 3V, V

AVDD

= 10V, V

OUT

= 5V, R

SET

= 30.1kΩ, T

= 0°C to +85°C, unless otherwise noted. Typical values

are at T

= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CTL EEPROM Program Voltage V

(Note 3) 15.25 15.5 15.75 V

OUTPUT VOLTAGE

OUT Leakage Current V

= 2.1V 1 nA

OUT Settling Time To ±0.5 LSB error band 20 µs

OUT

Voltage Range V

OUT

SET

+ 0.5V 13 V

AVDD SUPPLY

AVDD

Supply Range V

AVDD

4.5 20.0 V

= 2.1V, V

AVDD

= 20V 0.04

AVDD Operating Current I

AVDD

= 20V 10 20

µA

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SINK-CURRENT ADJUSTMENT

SET Differential Nonlinearity Guaranteed monotonic -1 +1 LSB

SET Zero-Scale Error -1 +2 LSB

SET Full-Scale Error -12 +12 LSB

SET Current I

SET

120 µA

To GND, V

AVDD

= 20V 10 200

SET External Resistance (Note 2) R

SET

To GND, V

AVDD

= 4.5V 2.25 45.00

kΩ

SUPPLY

Supply Range V

2.6 3.6 V

CE = V

Supply Current I

CE = GND 20

µA

Rising edge 2.2 2.7

Power-On Reset Threshold

Falling edge 2.1 2.6

CONTROL AND PROGRAMMING

CE Input Low Voltage 2.6V < V

< 3.6V 0.4 V

CE Input High Voltage 2.6V < V

< 3.6V 1.6 V

AVDD SUPPLY

AVDD

Supply Range V

AVDD

4.5 20.0 V

AVDD Operating Current I

AVDD

= 20V 20 µA

P1-P3 P4-P6 P7-P9 P10-P12 P13-P13

MAX1512ETA+T

Mfr. #:

Buy MAX1512ETA+T

Manufacturer:

Maxim Integrated

Description:

LCD Gamma Buffers EEPROM-Prog TFT VCOM Calibrator

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MAX1512ETA+T