LTC2264UJ-14(RevB) データシートの表示（PDF） - Linear Technology

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LTC2264UJ-14
(Rev.:RevB)

14-Bit, 65Msps/40Msps/25Msps Low Power Dual ADCs

Linear Technology 

LTC2265-14/

LTC2264-14/LTC2263-14

APPLICATIONS INFORMATION

Amplifier Circuits

Figure 7 shows the analog input being driven by a high speed

differential amplifier. The output of the amplifier is AC-

coupled to the A/D so the amplifier’s output common mode

voltage can be optimally set to minimize distortion.

At very high frequencies an RF gain block will often have

lower distortion than a differential amplifier. If the gain

block is single-ended, then a transformer circuit (Figures

4 to 6) should convert the signal to differential before

driving the A/D.

0.1µF

ANALOG

INPUT

T1

0.1µF

50Ω

VCM

0.1µF

T2

25Ω 0.1µF

AIN+

LTC2265-14

4.7pF

25Ω

AIN–

ANALOG

INPUT

0.1µF

T1

0.1µF

50Ω

2.7nH

25Ω

0.1µF

25Ω

2.7nH

VCM

0.1µF

AIN+

LTC2265-14

AIN–

T1: MA/COM MABA-007159-000000

T2: MA/COM MABAES0060

RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE

226514 F04

Figure 4. Recommended Front-End Circuit for Input

Frequencies from 70MHz to 170MHz

T1: MA/COM ETC1-1-13

RESISTORS, CAPACITORS

ARE 0402 PACKAGE SIZE

226514 F06

Figure 6. Recommended Front-End Circuit for Input

Frequencies Above 300MHz

0.1µF

ANALOG

INPUT

T1

0.1µF

50Ω

VCM

0.1µF

T2

25Ω 0.1µF

AIN+

LTC2265-14

1.8pF

25Ω

AIN–

T1: MA/COM MABA-007159-000000

T2: COILCRAFT WBC1-1LB

RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE

226514 F05

Figure 5. Recommended Front-End Circuit for Input

Frequencies from 170MHz to 300MHz

ANALOG

INPUT

HIGH SPEED

DIFFERENTIAL

AMPLIFIER

0.1µF

++

200Ω 200Ω

25Ω

– – 0.1µF

25Ω

VCM

0.1µF

AIN+

LTC2265-14

12pF

AIN–

226514 F07

Figure 7. Front-End Circuit Using a High Speed

Differential Amplifier

22654314fb

19

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