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LTC1063

DC Accurate, Clock-Tunable

5th Order Butterworth

Lowpass Filter

DESCRIPTIO

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FEATURE

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Clock-Tunable Cutoff Frequency

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1mV DC Offset (Typical)

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80dB CMRR (Typical)

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Internal or External Clock

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50

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100:1 Clock-to-Cutoff Frequency Ratio

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95

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50kHz Maximum Cutoff Frequency

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Cascadable for Faster Roll-Off

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Operates from

±2.375 to ±8V Power Supplies

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Self-Clocking with 1 RC

The LTC1063 is the first monolithic filter providing both

clock-tunability, low DC output offset and over 12-bit DC

accuracy. The frequency response of the LTC1063 closely

approximates a 5th order Butterworth polynomial. With

appropriate PCB layout techniques the output DC offset is

typically 1mV and is constant over a wide range of clock

frequencies. With

±5V supplies and ±4V input voltage

range, the CMR of the device is 80dB.

The filter cutoff frequency is controlled either by an inter-

nal or external clock. The clock-to-cutoff frequency ratio is

100:1. The on-board clock is power supply independent,

and it is programmed via an external RC. The 50

clock feedthrough is considerably reduced over existing

monolithic filters.

The LTC1063 wideband noise is 95

process large AC input signals with low distortion. With

±7.5V supplies, for instance, the filter handles up to

below 0.02%; 80dB dynamic ranges (S/N +THD) is ob-

The LTC1063 is available in 8-pin miniDIP and 16-pin SOL.

For a linear phase response, see LTC1065 data sheet.

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APPLICATI

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Audio

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Strain Gauge Amplifiers

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Anti-Aliasing Filters

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Low Level Filtering

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Digital Voltmeters

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60Hz Lowpass Filters

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Smoothing Filters

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Reconstruction Filters

APPLICATI

TYPICAL

2.5kHz 5th Order Lowpass Filter

Frequency Response

FREQUENCY (kHz)

1

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

10

100

1063 TA02

–5V

*19.1k

5V

0.1

µF

1063 TA01

SELF-CLOCKING SCHEME

*

**

0.1

µF

200pF*

1

2

3

4

8

7

6

5

LTC1063