LTC1066-1

1

10661fa

■ DC Gain Linearity: 14 Bits

■ Maximum DC Offset:

±1.5mV

■ DC Offset TempCo: 7

µV/°C

■ Device Fully Tested at fCUTOFF = 80kHz

■ Maximum Cutoff Frequency: 120kHz (VS = ±8V)

■ Drives 1k

Ω Load with 0.02% THD or Better

■ Signal-to-Noise Ratio: 90dB

■ Input Impedance: 500M

Ω

■ Selectable Elliptic or Linear Phase Response

■ Operates from Single 5V up to

±8V Power Supplies

■ Available in an 18-Pin SO Wide Package

FREQUENCY (Hz)

100

10k

100k

1M

1066-1 TA02

1k

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

fC = 800Hz

fC = 80kHz

7.5V

1066-1 TA01

–7.5V

–7.5V

7.5V

VOUT;

VOS(OUT) =

2.5mVMAX

VIN

40kHz

≤ fCLK ≤ 4MHz

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

V–

V+

CONNECT 1

FILTEROUT

50/100

CLK

V+

OUT B

+IN B

GND

FILTERIN

COMP 2

CONNECT 2

COMP 1

V–

LTC1066-1

20k

30k

SHORT CONNECTION UNDER

IC AND SHIELDED BY A

GROUND PLANE

BYPASS THE POWER SUPPLIES

WITH 0.1

µF DISC CERAMIC

■ Instrumentation

■ Data Acquisition Systems

■ Anti-Aliasing Filters

■ Smoothing Filters

■ Audio Signal Processing

APPLICATIO S

FEATURES

DESCRIPTIO

14-Bit DC Accurate

Clock-Tunable, 8th Order Elliptic

or Linear Phase Lowpass Filter

Amplitude Response

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

The LTC

®1066-1 is an 8th order elliptic lowpass filter

which simultaneously provides clock-tunability and DC

accuracy. 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

sink 40mA. When pin 8 is connected to V +, the clock-to-

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

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

For frequencies up to 0.75fCUTOFF, the passband ripple is

±0.15dB. The gain at fCUTOFF is –1dB and the filter’s

stopband attenuation is 80dB at 2.3fCUTOFF. Linear phase

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 SO Wide package.

TYPICAL APPLICATIO

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

All other trademarks are the property of their respective owners.