LTC6945 datasheet(14/24 Pages) LINER

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LTC2271

2271f

APPLICATIONS INFORMATION

25Ω

50Ω

0.1μF

AIN+

AIN–

12pF

1μF

VCM

LTC2271

ANALOG

INPUT

0.1μF

1:1

T1: MA/COM MABAES0060

RESISTORS, CAPACITORS

ARE 0402 PACKAGE SIZE

2271 F03

Figure 3. Analog Input Circuit Using a Transformer.

Recommended for Input Frequencies from 1MHz to 40MHz

25Ω

50Ω

12Ω

0.1μF

AIN+

AIN–

8.2pF

1μF

VCM

ANALOG

INPUT

0.1μF

T1: MA/COM MABA-007159-000000

T2: COILCRAFT WBC1-1TL

RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE

2271 F04

LTC2271

Figure 4. Recommended Front-End Circuit for Input Frequencies

from 5MHz to 80MHz

25Ω

50Ω

0.1μF

AIN+

AIN–

1.8pF

1μF

VCM

ANALOG

INPUT

0.1μF

T1: MA/COM MABA-007159-000000

T2: COILCRAFT WBC1-1TL

RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE

2271 F05

LTC2271

Figure 5. Recommended Front-End Circuit for Input Frequencies

Above 80MHz

25Ω

200Ω

0.1μF

AIN+

AIN–

1μF

12pF

VCM

LTC2271

2271 F06

–

ANALOG

INPUT

HIGH SPEED

DIFFERENTIAL

AMPLIFIER

0.1μF

Figure 6. Front-End Circuit Using a High Speed

Differential Ampliﬁer

Figure 7. DC-Coupled Ampliﬁer

Ampliﬁer Circuits

Figure 6 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.

If DC coupling is necessary use a differential ampliﬁer

with an output common mode set by the LTC2271 VCM

pin (Figure 7).

25Ω

AIN+

AIN–

1μF

25pF

VCM

LTC2271

2271 F07

–

ANALOG

INPUT

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