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LTC1065ISW

DC Accurate, Clock-Tunable Linear Phase 5th Order Bessel Lowpass Filter

Linear Technology 

LTC1065

DC Accurate, Clock-Tunable

Linear Phase 5th Order Bessel

Lowpass Filter

FEATURES

■ Clock-Tunable Cutoff Frequency

■ 1mV DC Offset (Typical)

■ 80dB CMR (Typical)

■ Internal or External Clock

■ 50µVRMS Clock Feedthrough

■ 100:1 Clock-to-Cutoff Frequency Ratio

■ 80µVRMS Total Wideband Noise

■ 0.004% Noise + THD at 2VRMS Output Level

■ 50kHz Maximum Cutoff Frequency

■ Cascadable for Faster Roll-Off

■ Operates from ±2.375 to ±8V Power Supplies

■ Self-Clocking with 1 RC

■ Available in 8-Pin DIP and 16-Pin SW Packages

U

APPLICATIO S

■ Audio

■ Strain Gauge Amplifiers

■ Anti-Aliasing Filters

■ Low Level Filtering

■ Digital Voltmeters

■ Smoothing Filters

■ Reconstruction Filters

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners. Protected by U.S. Patents

including 4857860.

DESCRIPTIO

The LTC®1065 is the first monolithic filter providing both

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

DC accuracy. The frequency response of the LTC1065

closely approximates a 5th order Bessel 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 typically 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 nearly power supply inde-

pendent and it is programmed via an external RC. The

50µVRMS clock feedthrough of the device is considerably

lower than other existing monolithic filters.

The LTC1065 wideband noise is 80µVRMS and it can

process large AC input signals with low distortion. With

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

4VRMS (94dB S/N ratio) while the standard 1kHz THD is

below 0.005%; 87dB dynamic range (S/N + THD) is ob-

tained with input levels between 2VRMS and 2.5VRMS.

The LTC1065 is available in 8-pin miniDIP and 16-pin SW

packages. For a Butterworth response, see LTC1063 data

sheet. The LTC1065 is pin compatible with the LTC1063.

TYPICAL APPLICATIO

3.4kHz Single 5V Supply Bessel Lowpass Filter

5V

4.99k

+ 1µF 4.53k

TANT

VIN 1

2

0.1µF 3

4

LTC1065

8

7 VOUT

6

5V

5

0.1µF

13k*

* SELF-CLOCKING SCHEME

200pF*

1065 TA01

10

0

–10

– 20

– 30

– 40

– 50

– 60

– 70

– 80

– 90

1

Frequency Response

10

FREQUENCY (kHz)

100

1065 TA01b

1065fb

1

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