LTC1401CS8-TRPBF(RevA) Ver la hoja de datos (PDF) - Linear Technology

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LTC1401CS8-TRPBF
(Rev.:RevA)

Complete SO-8, 12-Bit, 200ksps ADC with Shutdown

Linear Technology 

LTC1401

PIN FUNCTIONS

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

tantalum in parallel with 0.1µF ceramic).

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

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

(10µF 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.

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 4.5µA in this mode.

W

FUNCTIONAL BLOCK DIAGRA

AIN

VREF

1.20V REF

CSAMPLE

ZEROING SWITCH

12-BIT CAPACITIVE DAC

COMP

VCC

GND

SHDN

CLK

CONV

CONTROL

LOGIC

12

SUCCESSIVE APPROXIMATION

REGISTER/PARALLEL TO

SERIAL CONVERTER

DOUT

LTC1401 • BD01

TEST CIRCUITS

DOUT

3k

CLOAD

Hi-Z TO VOH

VOL TO VOH

VOH TO Hi-Z

6

DOUT

3V

3k

CLOAD

Hi-Z TO VOL

VOH TO VOL

VOL TO Hi-Z

LTC1401 • TC01

1401fa

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