LTC1426CS8 datasheet(4/8 Pages) LINER

4 / 8 page

LTC1426

TYPICAL PERFORMANCE CHARACTERISTICS

TEMPERATURE (

°C)

–40

100

200

300

400

500

600

–15

1426 G04

VCC = 3V

VCC = 5V

TEMPERATURE (

°C)

–40

–15

1426 G06

PUSHBUTTON

MODE

PULSE

MODE

VCC = 5V

Supply Current vs Temperature

LOGIC INPUT VOLTAGE (V)

38.5

36.5

34.5

32.5

30.5

28.5

26.5

24.5

22.5

1426 F05

PULSE

MODE

PUSHBUTTON

MODE

TA = 25°C

CLK1 AND CLK2

TIED TOGETHER

Supply Current

vs Logic Input Voltage

PIN FUNCTIONS

span. Bypass VREF to GND with an external capacitor to

minimize output errors. VREF can be tied to VCC if desired.

VCC (Pin 7): Voltage Supply. This supply must be kept free

from noise and ripple by bypassing directly to the ground

plane.

SHDN (Pin 8): Shutdown. A logic low puts the chip into

shutdown mode with the PWM outputs in high imped-

ance. The digital settings for the DACs are retained in

shutdown.

CLK1 (Pin 1): Channel 1 Clock/Pushbutton Input.

CLK2 (Pin 2): Channel 2 Clock/Pushbutton Input.

GND (Pin 3): Ground. It is recommended that GND be tied

to a ground plane.

PWM1 (Pin 4): Channel 1 PWM Output.

PWM2 (Pin 5): Channel 2 PWM Output.

VREF (Pin 6): Voltage Reference Input. VREF powers the

DAC output buffers and can be used to control the output

CLK1

CLK2

tCKL0

1426 TC01

tCKHI

1426 TC02

CLK1

CLK2

tPW

Pushbutton Mode Timing

Pulse Mode Timing

TI I G DIAGRA S

Minimum Clock High Time

vs Temperature

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