LTC2245 datasheet(8/20 Pages) LINER

Part #	LTC2245

Description	14-Bit, 10Msps Low Power 3V ADC

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Manufacturer	LINER [Linear Technology]

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LTC2245

8

2245fa

SENSE (Pin 30): Reference Programming Pin. Connecting

SENSE to VCM selects the internal reference and a ±0.5V

input range. VDD selects the internal reference and a ±1V

input range. An external reference greater than 0.5V and

less than 1V applied to SENSE selects an input range of

±VSENSE. ±1V is the largest valid input range.

PI FU CTIO S

FUNCTIONAL BLOCK DIAGRA

SHIFT REGISTER

AND CORRECTION

DIFF

REF

AMP

REF

BUF

2.2

µF

1

µF1µF

0.1

µF

INTERNAL CLOCK SIGNALS

REFH

REFL

CLOCK/DUTY

CYCLE

CONTROL

RANGE

SELECT

1.5V

REFERENCE

FIRST PIPELINED

ADC STAGE

FIFTH PIPELINED

ADC STAGE

SIXTH PIPELINED

ADC STAGE

FOURTH PIPELINED

ADC STAGE

SECOND PIPELINED

ADC STAGE

REFH

REFL

CLK

OE

MODE

OGND

OVDD

2245 F01

INPUT

S/H

SENSE

VCM

AIN

–

AIN

+

2.2

µF

THIRD PIPELINED

ADC STAGE

OUTPUT

DRIVERS

CONTROL

LOGIC

SHDN

OF

D13

D0

•

Figure 1. Functional Block Diagram

VCM (Pin 31): 1.5V Output and Input Common Mode Bias.

Bypass to ground with 2.2

µF ceramic chip capacitor.

GND (Exposed Pad) (Pin 33): ADC Power Ground. The

exposed pad on the bottom of the package needs to be

soldered to ground.

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LTC2245 Datasheet(PDF) 8 Page - Linear Technology

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