LTC2421 datasheet(9/32 Pages) LINER

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LTC2421/LTC2422

24212f

PIN FUNCTIONS

SCK (Pin 9): Bidirectional Digital Clock Pin. In the Internal

Serial Clock Operation mode, SCK is used as digital output

for the internal serial interface clock during the data output

period. In the External Serial Clock Operation mode, SCK

is used as digital input for the external serial interface. An

internal pull-up current source is automatically activated

in Internal Serial Clock Operation mode. The Serial Clock

mode is determined by the level applied to SCK at power

up and the falling edge of CS.

FO (Pin 10): Frequency Control Pin. Digital input that

controls the ADC’s notch frequencies and conversion

time. When the FO pin is connected to VCC (FO = VCC), the

converter uses its internal oscillator and the digital filter’s

first null is located at 50Hz. When the FO pin is connected

to GND (FO = 0V), the converter uses its internal oscillator

and the digital filter’s first null is located at 60Hz. When FO

is driven by an external clock signal with a frequency fEOSC,

the converter uses this signal as its clock and the digital

filter first null is located at a frequency fEOSC/2560.

FUNCTIONAL BLOCK DIAGRA

TEST CIRCUITS

3.4k

SDO

24212 TC01

Hi-Z TO VOH

VOL TO VOH

VOH TO Hi-Z

CLOAD = 20pF

3.4k

SDO

24212 TC02

Hi-Z TO VOL

VOH TO VOL

VOL TO Hi-Z

CLOAD = 20pF

VCC

AUTOCALIBRATION

AND CONTROL

DAC

DECIMATING FIR

INTERNAL

OSCILLATOR

SERIAL

INTERFACE

ADC

∑

∫

GND

VCC

VIN

SDO

SCK

VREF

(INT/EXT)

24212 FD

LTC2421 Datasheet(PDF) 9 Page - Linear Technology

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