LTC1069-6

1

Rev. B

For more information www.analog.com

Document Feedback

TYPICAL APPLICATION

DESCRIPTION

Single Supply, Very Low

Power, Elliptic Lowpass Filter

The LTC®1069-6 is a monolithic low power, 8th order low-

pass filter optimized for single 3V or single 5V supply

operation. The LTC1069-6 typically consumes 1mA under

single 3V supply operation and 1.2mA under 5V operation.

The cutoff frequency of the LTC1069-6 is clock tunable and it

is equal to the clock frequency divided by 50. The input signal

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

The typical passband ripple is ±0.1dB up to 0.9fCUTOFF.

The gain at fCUTOFF is –0.7dB. The transition band of the

LTC1069-6 features progressive attenuation reaching

42dB at 1.3fCUTOFF and 70dB at 2.1fCUTOFF. The maximum

stopband attenuation is 72dB.

The LTC1069-6 can be clock tuned for cutoff frequencies

up to 20kHz (single 5V supply) and for cutoff frequencies

up to 14kHz (single 3V supply).

The low power feature of the LTC1069-6 does not penalize

the device’s dynamic range. With single 5V supply and

an input range of 0.4VRMS to 1.4VRMS, the Signal-to-

(Noise + THD) ratio is ≥70dB. The wideband noise of the

LTC1069-6 is 125µVRMS.

Other filter responses with higher speed can be obtained.

Please contact Analog Devices Marketing for details.

The LTC1069-6 is available in an 8-pin SO package.

Single 3V Supply 10kHz Elliptic Lowpass Filter

FEATURES

APPLICATIONS

n

8th Order Elliptic Filter in SO-8 Package

n

Single 3V Operation: Supply Current: 1mA (Typ)

fCUTOFF: 14kHz (Max) S/N Ratio: 72dB

n

Single 5V Operation: Supply Current: 1.2mA (Typ)

fCUTOFF: 20kHz (Max) S/N Ratio: 79dB

n

±0.1dB Passband Ripple Up to 0.9fCUTOFF (Typ)

n

42dB Attenuation at 1.3fCUTOFF

n

66dB Attenuation at 2.0fCUTOFF

n

70dB Attenuation at 2.1fCUTOFF

n

Wide Dynamic Range, 75dB or More (S/N + THD),

Under Single 5V Operation

n

Wideband Noise: 120µVRMS

n

Clock-to-fCUTOFF Ratio: 50:1

n

Internal Sample Rate: 100:1

n

Handheld Instruments

n

Telecommunication Filters

n

Antialiasing Filters

n

Smoothing Filters

n

Audio

n

Multimedia

AGND

V+

NC

VIN

VOUT

V–

NC

CLK

LTC1069-6

fCLK = 500kHz

3V

0.47µF

0.1µF

1069-6 TA01

FREQUENCY (kHz)

5

–80

–70

–50

–40

–30

15

10

1069-6 TA02

–60

10

20

25

–20

–10

0

VIN = 500mVRMS

Frequency Response

All registered trademarks and trademarks are the property of their respective owners.