MAXIM MAX1512 Technical data

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 voltage­divider 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 single­wire 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 sim­plify 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

DD

)

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

AVDD

)

♦ V

DD

UVLO Protection

♦ 8-Pin 3mm x 3mm TDFN (0.8mm max)

MAX1512

EEPROM-Programmable TFT VCOM Calibrator

________________________________________________________________ Maxim Integrated Products 1

CE

CTL

AVDD

R

SET

OUT

R2

R1

VCOM

SET

GND

V

DD

V

DD

AVDD

MAX1512

Pin Configuration

Ordering Information

1

2

3

4

8

7

6

5

SET

CE

CTL

V

DD

GND

N.C.

AVDD

OUT

MAX1512

TDFN

TOP VIEW

Typical Operating Circuit

19-2911 Rev 2; 8/04

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

PIN-PACKAGE

MAX1512ETA

8 TDFN 3mm x 3mm

EVALUATION KIT

AVAILABLE

*Patent Pending.

查询MAX1512供应商

TEMP RANGE

-40°C to +85°C

MAX1512

EEPROM-Programmable TFT VCOM Calibrator

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, VDD= 3V, V

AVDD

= 10V, V

OUT

= 5V, R

SET

= 30.1kΩ, TA= 0°C to +85°C, unless otherwise noted. Typical values

are at T

A

= +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.

VDD, 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

A

= +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

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

kΩ

V

SET

/ V

AVDD

Voltage Ratio DAC full scale

V/V

V

SET

/ V

AVDD

Factory Set Voltage

Ratio

V/V

VDD SUPPLY

VDD Supply Range V

DD

2.6 3.6 V

CE = V

DD

32 55

VDD Supply Current I

DD

CE = GND 12 20

µA

Rising edge 2.2 2.5 2.7

VDD Power-On Reset Threshold

Falling edge 2.1 2.4 2.6

V

VDD Power-On Reset Hysteresis

mV

CONTROL AND PROGRAMMING

CE Input Low Voltage 2.6V < VDD < 3.6V 0.4 V

CE Input High Voltage 2.6V < VDD < 3.6V 1.6 V

CE Startup Time (Note 3) 1 ms

CTL High Voltage 2.6V < VDD < 3.6V

V

CTL Float Voltage 2.6V < VDD < 3.6V

V

CTL Low Voltage 2.6V < VDD < 3.6V

V

CTL Rejected Pulse Width 20 µs

CTL Minimum Pulse Width

µs

CTL Minimum Time Between
Pulses

10 µs

CTL = GND -10

CTL Input Current

CTL = V

DD

10

µA

+12

2.25 45.00

0.05

0.024 0.025 0.026

100

0.70 x V

0.40 x V

0.20 x V

DD

DD

DD

0.82 x V

0.62 x V

0.32 x V

DD

DD

DD

200

MAX1512

EEPROM-Programmable TFT VCOM Calibrator

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS

(VDD= 3V, V

AVDD

= 10V, V

OUT

= 5V, R

SET

= 30.1kΩ, TA= -40°C to +85°C, unless otherwise noted.) (Note 1)

Note 1: Limits are 100% production tested at T

A

= +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, VDD= 3V, V

AVDD

= 10V, V

OUT

= 5V, R

SET

= 30.1kΩ, TA= 0°C to +85°C, unless otherwise noted. Typical values

are at T

A

= +25°C.) (Note 1)

CTL Input Current

CTL = V

DD

10

µA

PARAMETER

CONDITIONS

UNITS

CTL EEPROM Program Voltage V

PP

(Note 3)

V

OUTPUT VOLTAGE

OUT Leakage Current V

DD

= 2.1V 1 nA

OUT Settling Time To ±0.5 LSB error band 20 µs

V

OUT

Voltage Range V

OUT

13 V

AVDD SUPPLY

V

AVDD

Supply Range V

AVDD

4.5

V

SYMBOL

MIN TYP MAX

15.25 15.5 15.75

V

+ 0.5V

SET

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 External Resistance (Note 2) R

VDD SUPPLY

VDD Supply Range V

VDD Supply Current I

VDD Power-On Reset Threshold

CONTROL AND PROGRAMMING

CE Input Low Voltage 2.6V < VDD < 3.6V 0.4 V

CE Input High Voltage 2.6V < VDD < 3.6V 1.6 V

AVDD SUPPLY

V

AVDD

AVDD Operating Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SET

SET

DD

DD

To GND, V

To GND, V

= 20V 10 200

AVDD

= 4.5V 2.25 45.00

AVDD

2.6 3.6 V

CE = V

DD

CE = GND 20

120 µA

55

Rising edge 2.2 2.7

Falling edge 2.1 2.6

Supply Range V

AVDD

AVDD

V

= 20V 20 µA

AVDD

4.5 20.0 V

20.0

kΩ

µA

V

MAX1512

EEPROM-Programmable TFT VCOM Calibrator

4 _______________________________________________________________________________________

Typical Operating Characteristics

(Circuit of Figure 1, VDD= 3V, V

AVDD

= 10V, V

OUT

= 5V, R

SET

= 24.9kΩ, TA= +25°C, DAC half scale, unless otherwise noted.)

VDD SUPPLY CURRENT

vs. TEMPERATURE

MAX1512 toc01

TEMPERATURE (°C)

V

DD

SUPPLY CURRENT (µA)

806020 400-20

31.6

31.8

32.0

32.2

32.4

32.6

32.8

33.0

33.2

31.4

-40

CE = VDD = 3V

VDD SUPPLY CURRENT vs. V

DD

MAX1512 toc02

VDD (V)

V

DD

SUPPLY CURRENT (µA)

3.43.22.4 2.6 2.8 3.0

5

10

15

20

25

30

35

40

0

2.2 3.6

RISING

FALLING

CE = V

DD

I

OUT

vs. R

SET

MAX1512 toc03

R

SET

(kΩ)

I

OUT

(µA)

100101

1

10

100

1000

10,000

0.1

0.1 1000

V

AVDD

= 20V

V

AVDD

= 4.5V

VDD = V

OUT

= 3V

I

OUT

SINK-CURRENT ERROR vs. V

DD

MAX1512 toc04

VDD (V)

I

OUT

SINK-CURRENT ERROR (LSB)

3.43.23.02.8

2.825

2.830

2.835

2.840

2.845

2.850

2.855

2.820

2.6 3.6

I

OUT

SINK-CURRENT ERROR vs. V

AVDD

MAX1512 toc05

V

AVDD

(V)

I

OUT

SINK-CURRENT ERROR (LSB)

18.516.514.512.510.58.56.5

2.75

2.80

2.85

2.90

2.95

3.00

3.05

2.70

4.5

I

OUT

SINK-CURRENT ERROR vs. V

OUT

MAX1512 toc06

V

OUT

(V)

I

OUT

SINK-CURRENT ERROR (LSB)

1.51.00.5

2.835

0 2.0

2.840

2.830

I

OUT

SINK-CURRENT ERROR

vs. TEMPERATURE

MAX1512 toc07

TEMPERATURE (°C)

I

OUT

SINK-CURRENT ERROR (LSB)

806040200-20

2.8

2.9

3.0

2.7

-40