1

LTC1066-1

14-Bit DC Accurate

Clock-Tunable, 8th Order Elliptic

or Linear Phase Lowpass Filter

APPLICATI

TYPICAL

FREQUENCY (Hz)

100

10k

100k

1M

1066-1 TA02

1k

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

Amplitude Response

Clock-Tunable, DC Accurate, 800Hz to 80kHz Elliptic Lowpass Filter

7.5V

1066-1 TA01

–7.5V

–7.5V

7.5V

40kHz

1

µF

1

2

3

4

5

6

7

8

9

18

17

16

15

14

13

12

11

10

15pF

OUT A

–IN A

+IN A

CONNECT 1

50/100

CLK

OUT B

+IN B

GND

COMP 2

CONNECT 2

COMP 1

LTC1066-1

20k

30k

SHORT CONNECTION UNDER

IC AND SHIELDED BY A

GROUND PLANE

BYPASS THE POWER SUPPLIES

WITH 0.1

µF DISC CERAMIC

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FEATURE

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DC Gain Linearity: 14 Bits

s

Maximum DC Offset:

±1.5mV

s

DC Offset TempCo: 7

µV/°C

s

s

s

Drives 1k

Ω Load with 0.02% THD or Better

s

Signal-to-Noise Ratio: 90dB

s

Input Impedance: 500M

Ω

s

Selectable Elliptic or Linear Phase Response

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Operates from Single 5V up to

±8V Power Supplies

DESCRIPTIO

The LTC1066-1 is an 8th order elliptic lowpass filter which

simultaneously provides clock-tunability and DC accu-

racy. The unique and proprietary architecture of the filter

allows 14 bits of DC gain linearity and a maximum of

1.5mV DC offset. An external RC is required for DC

accurate operation. With

±7.5V supplies, a 20k resistor

and a 1

µF capacitor, the cutoff frequency can be tuned

from 800Hz to 100kHz. A clock-tunable 10Hz to 100kHz

operation can also be achieved (see Typical Application

section).

The filter does not require any external active components

such as input/output buffers. The input/output impedance

is 500M

Ω/0.1Ω and the output of the filter can source or

cutoff frequency ratio is 50:1 and the input signal is

sampled twice per clock cycle to lower the risk of aliasing.

operation is also available with a clock-to-cutoff frequency

ratio of 100:1 when pin 8 is connected to ground.

The LTC1066-1 is available in an 18-pin SOL package.

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APPLICATI

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Instrumentation

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Data Acquisition Systems

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Anti-Aliasing Filters

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Smoothing Filters

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Audio Signal Processing