LTC1426CS8 datasheet(1/8 Pages) LINER

部件名	LTC1426CS8

功能描述	Micropower Dual 6-Bit PWM DAC

PDF	8 Pages

Scroll/Zoom	100%

制造商	LINER [Linear Technology]

网页	http://www.linear.com

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1

LTC1426

Micropower

Dual 6-Bit PWM DAC

FEATURES

DESCRIPTION

s

Wide Supply Range: 2.7V

≤ VCC ≤ 5.5V

s

Wide Reference Voltage Range: 0V to 5.5V

s

Two Interface Modes:

Pulse Mode (Increment Only)

Pushbutton Mode (Increment/Decrement)

s

Low Supply Current: 50

µA

s

0.2

µA Supply Current in Shutdown

s

Available in 8-Pin MSOP and SO Packages

s

DAC Contents Are Retained in Shutdown

s

DACs Power-Up at Midrange

s

Low Output Impedance: < 100

Ω

s

Output Frequency: 5kHz Typ

The LTC

®1426 is a dual micropower 6-bit PWM DAC

featuring versatile PWM outputs and a flexible pushbutton

compatible digital interface. The DAC outputs provide a

PWM signal that swings from 0V to VREF, allowing the full-

scale output to be varied by adjusting the voltage at VREF.

The PWM output frequency is typically 5kHz, easing

output filtering requirements. VCC supply current is typi-

cally 50

µA and drops to 0.2µA in shutdown.

The LTC1426 can be controlled using one of two interface

modes: pushbutton and pulse. The LTC1426 automati-

cally configures itself into the appropriate mode at start-

up by monitoring the state of the CLK pins. In pushbutton

mode, the CLK pins can be directly connected to external

pushbuttons to control the DAC output. In pulse mode,

the CLK pins can be connected to CMOS compatible

logic. The DAC outputs initially power up at half scale and

the contents of the internal DAC registers are retained in

shutdown.

The LTC1426 is available in 8-pin MSOP and SO packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

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LCD Contrast and Backlight Brightness Control

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Power Supply Voltage Adjustment

s

Battery Charger Voltage and Current Adjustment

s

GaAs FET Bias Adjustment

s

Trimmer Pot Elimination

APPLICATIONS

TYPICAL APPLICATION

Pushbutton Adjustable CCFL/LCD Contrast Generator

1

2

3

4

8

7

6

5

CLK1

CLK2

GND

PWM1

SHDN

VCC

VREF

PWM2

LTC1426

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

CCFL PGND

ICCFL

DIO

CCFL VC

AGND

SHDN

LCD VC

LCD PGND

CCFL VSW

BULB

BAT

ROYER

VIN

FBP

FBN

LCD VSW

LT1182

1426 TA01

C4

0.1

µF

5V

DOWN

CONTRAST

UP/DOWN

CCFL UP/DOWN

DOWN

UP

RP1

47k

RP2

47k

RSHDN

1M

SHDN

R5

20k

1%

R6

40k

1%

R4

4.99k

1%

R3

5.1k

1%

R1

44.2k

1%

R2

44.2k

1%

UP TO 6mA

ICCFL = 0µA TO 50µA

C3

10

µF

C9

2.2

µF

5V

CONSULT THE LT1182 DATA SHEET FOR

DETAILS ON THE HIGH VOLTAGE ROYER

AND LCD CONTRAST CONVERTER SECTIONS

C2

1

µF

C10

2.2

µF

35V

8V TO

28V

C1

0.1

µF

C8

0.68

µF

C7 1

µF

R7

10k

HIGH VOLTAGE

ROYER

LAMP

LCD

CONTRAST

CONVERTER

VOUT

NEGATIVE

LCD CONTRAST

VOUT = –10V TO –30V

+

C11

2.2

µF

35V

+

类似零件编号 - LTC1426CS8

制造商	部件名	数据表	功能描述
Linear Technology	LTC1426	209Kb / 8P	Micropower Dual 6-Bit PWM DAC
Analog Devices	LTC1426	154Kb / 12P	Micropower Dual 6-Bit PWM DAC 06/18-REV.A
Linear Technology	LTC1426	209Kb / 8P	Micropower Dual 6-Bit PWM DAC

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