LTC2223IUK(RevA) View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC2223IUK
(Rev.:RevA)

12-Bit, 105Msps/80Msps ADCs

Linear Technology 

LTC2222/LTC2223

APPLICATIO S I FOR ATIO

VCM

ANALOG

INPUT

0.1µF

4.7nH

2.2µF

AIN+

25Ω 0.1µF

T1

2pF

0.1µF

25Ω 4.7nH

AIN–

T1 = MA/COM ETC1-1-13

RESISTORS, CAPACITORS, INDUCTORS

ARE 0402 PACKAGE SIZE

LTC2222/23

22223 F08

Figure 8. Recommended Front End Circuit for

Input Frequencies Above 500MHz

1.6V

TIE TO VDD FOR 2V RANGE;

TIE TO VCM FOR 1V RANGE;

RANGE = 2 • VSENSE FOR

0.5V < VSENSE < 1V

1µF

LTC2222/LTC2223

VCM

2.2µF

4Ω 1.6V BANDGAP

REFERENCE

1V 0.5V

SENSE

REFLB

0.1µF

REFHA

RANGE

DETECT

AND

CONTROL

BUFFER

INTERNAL ADC

HIGH REFERENCE

1.6V

12k

0.8V

12k

VCM

2.2µF

SENSE

1µF

LTC2222/

LTC2223

22223 F10

Figure 10. 1.6V Range ADC

2.2µF

1µF

REFLA

0.1µF

REFHB

DIFF AMP

INTERNAL ADC

LOW REFERENCE

Figure 9. Equivalent Reference Circuit

22223 F09

22223fa

19

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