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LTC1069-1IN8

Low Power, 8th Order Progressive Elliptic, Lowpass Filter

Linear Technology 

LTC1069-1

APPLICATIONS INFORMATION

Aliasing

Aliasing is an inherent phenomenon of sampled data

systems and it occurs for input frequencies approaching

the sampling frequency. The internal sampling frequency

of the LTC1069-1 is 100 times its cutoff frequency. For

instance, if a 98kHz, 100mVRMS signal is applied at the

input of an LTC1069-1 operating with a 100kHz clock, a

2kHz, 28μVRMS alias signal will appear at the filter output.

Table 4 shows details.

Table 4. Aliasing (fCLK = 100kHz)

INPUT FREQUENCY

(VIN = 1VRMS)

(kHz)

OUTPUT LEVEL

(Relative to Input)

(dB)

fCLK/fC = 100:1, fCUTOFF = 1kHz

96 (or 104)

97 (or 103)

98 (or 102)

98.5 (or 101.5)

99 (or 101)

99.5 (or 100.5)

–90.0

–86.0

–71.0

–56.0

–1.1

–0.21

OUTPUT FREQUENCY

(Aliased Frequency)

(kHz)

4.0

3.0

2.0

1.5

1.0

0.5

TYPICAL APPLICATIONS

Single 5V Operation with Power Shutdown

SHUTDOWN

ON

5V

CMOS LOGIC

0.47μF

0.1μF

1 AGND VOUT 8

2 V+

V– 7

3

LTC1069-1

NC

NC

6

VOUT

VIN 4 VIN

CLK 5

fCLK ≤

750kHz

5V

0V

1069-1 TA04

Single 3.3V Supply Operation with Output Buffer

3.3V

0.47μF

0.1μF

1 AGND VOUT 8

2 V+

V– 7

3

LTC1069-1

NC

NC

6

VIN 4 VIN

CLK 5

fCLK

500kHz

3.3V

0V

0.1μF

+

1/2 LT1366

–

VOUT

10691 TA05

10691fa

8

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