LTC2412IGN datasheet(11/36 Pages) LINER

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LTC2412

2412f

TEST CIRCUITS

FU CTIO AL BLOCK DIAGRA

Figure 1. Functional Block Diagram

PI FU CTIO S

FO (Pin 14): 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

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

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

and the digital filter 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 system clock and the

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

AUTOCALIBRATION

AND CONTROL

DECIMATING FIR

CH0/CH1

INTERNAL

OSCILLATOR

SERIAL

INTERFACE

PING-PONG

DIFFERENTIAL

3RD ORDER

∆Σ MODULATOR

+–

MUX

GND

REF+

CH0+

IN+

IN–

CH0–

CH1+

CH1–

REF –

VCC

SCK

SDO

(INT/EXT)

2412 FD

1.69k

SDO

2412 TA03

Hi-Z TO VOH

VOL TO VOH

VOH TO Hi-Z

CLOAD = 20pF

1.69k

SDO

2412 TA04

Hi-Z TO VOL

VOH TO VOL

VOL TO Hi-Z

CLOAD = 20pF

VCC

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