LT6002 datasheet(14/26 Pages) AD

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LTC6255/LTC6256/LTC6257

Rev E

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–10

–30

–40

–20

–50

625567 F03b

FREQUENCY (Hz)

100

100k

10M

10k

TYPICAL APPLICATIONS

90.9k

VIN

625567 F03a

VOUT

0.9V

–0.9V

–

10k

1/2 LTC6256

Frequency Response of 40dB

Gain Amplifier

LTC6255 Very Low Power 2nd Order Lowpass Filter

The LTC6256 circuit shown in Figure 4 is a 2nd order,

100kHz, Butterworth lowpass filter. The filter’s differential

output maximizes the dynamic range in very low voltage

operation. A general 2nd order lowpass circuit is shown in

Figure 3. Gain of 100 Amplifier (3dB Bandwidth of 200kHz on 130µA Supply Current)

Figure5withtheequationstocalculatetheRCcomponents

for cutoff frequencies up to 100kHz for a Butterworth or a

Bessel approximation (a Bessel lowpass filter has very low

transient response overshoot). In addition the equations

for a 4th order lowpass filter are provided to calculate the

RC components for two cascaded 2nd order sections.

200kHz 130µA Gain-of-100 Amplifier

A, 1.8V, 140µA, 100kHz, Lowpass Filter

(Single-Ended Input and Differential Output)

Frequency Response

FREQUENCY (Hz)

625567 F04b

10k

100k

–18

–30

–6

–42

–12

–24

–36

–

VOUT+

625567 F04a

VOUT–

2.49k

1/2 LTC6256

100pF

VIN

1000pF

10k

1.8V

2.49k

0.1µF

10µF

100k

Figure 4

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