LTC1401CS8 datasheet(6/20 Pages) LINER

6 / 20 page

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.

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