LTC2269 查看數據表（PDF） - Linear Technology

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LTC2269

16-Bit, 20Msps Low Noise ADC

Linear Technology 

APPLICATIONS INFORMATION

0.1μF

ANALOG

INPUT

T1

0.1μF

50Ω

VCM

1μF

T2

12Ω

25Ω 0.1μF

AIN+

LTC2269

8.2pF

25Ω

12Ω

AIN–

2269 F04

T1: MA/COM MABA-007159-000000

T2: COILCRAFT WBC1-1TL

RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE

Figure 4. Recommended Front End Circuit for

Input Frequencies from 5MHz to 80MHz

LTC2269

0.1μF

ANALOG

INPUT

T1

0.1μF

50Ω

VCM

1μF

T2

25Ω 0.1μF

AIN+

LTC2269

1.8pF

25Ω

AIN–

T1: MA/COM MABA-007159-000000

T2: COILCRAFT WBC1-1TL

RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE

2269 F05

Figure 5. Recommended Front End Circuit for

Input Frequencies Above 80MHz

ANALOG

INPUT

HIGH SPEED

DIFFERENTIAL

AMPLIFIER

0.1μF

+

200Ω 200Ω

25Ω

–

0.1μF

25Ω

VCM

1μF

AIN+

12pF

LTC2269

AIN–

12pF

2269 F06

Figure 6. Front End Circuit Using a

High Speed Differential Amplifier

+

ANALOG

INPUT

CM

–

VCM

1μF

25Ω

AIN+

25pF

LTC2269

25Ω

AIN–

25pF

2269 F07

Figure 7. DC-Coupled Amplifier

2269f

17

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