LTC1401CS8 datasheet(6/20 Pages) LINER

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LTC1401

PIN FUNCTIONS

VCC (Pin 1): Positive Supply, 3V. Bypass to GND (10µF

tantalum in parallel with 0.1

µF ceramic).

AIN (Pin 2): Analog Input. 0V to 2.048V.

VREF (Pin 3): 1.2V Reference Output. Bypass to GND

(10

µF tantalum in parallel with 0.1µF ceramic).

GND (Pin 4): Ground. GND should be tied directly to an

analog ground plane.

DOUT (Pin 5): The A/D conversion result is shifted out from

this pin.

LTC1401 • BD01

12-BIT CAPACITIVE DAC

COMP

SUCCESSIVE APPROXIMATION

SERIAL CONVERTER

ZEROING SWITCH

CONTROL

LOGIC

1.20V REF

DOUT

VCC

CONV

CLK

VREF

AIN

CSAMPLE

GND

SHDN

FUNCTIONAL BLOCK DIAGRA

LTC1401 • TC01

DOUT

CLOAD

Hi-Z TO VOH

VOL TO VOH

VOH TO Hi-Z

Hi-Z TO VOL

VOH TO VOL

VOL TO Hi-Z

TEST CIRCUITS

CLK (Pin 6): Clock. This clock synchronizes the serial data

transfer. A minimum CLK pulse of 60ns signals the ADC to

wake up from Nap or Sleep mode.

CONV (Pin 7): Conversion Start Signal. This active high

signal starts a conversion on its rising edge. Keeping CLK

low and pulsing CONV two/four times will put the ADC into

Nap/Sleep mode.

SHDN (Pin 8): Shutdown Input. Pull this pin Low to put the

ADC in Shutdown mode and save power (REFRDY will go

Low). The device will draw 4.5

µA in this mode.

LTC1401CS8 Datasheet(PDF) 6 Page - Linear Technology

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