LTC1164-8(RevA) 查看數據表（PDF） - Linear Technology

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LTC1164-8
(Rev.:RevA)

Ultraselective, Low Power 8th Order Elliptic Bandpass Filter with Adjustable Gain

Linear Technology 

LTC1164-8

APPLICATIONS INFORMATION

Table 4. Recommended Op Amps for LTC1164-8

Clock Feedthrough

SINGLE

DUAL

QUAD

LT1006

LT1013

LT1014

LT1012

LT1078

LT1079

LT1077

LT1112

LT1114

A

LT1413

Aliasing

At the filter’s output, alias signals will appear when

signals at the filter’s input have substantial energy very

near the clock frequency or any of its multiples (2 • fCLK,

3 • fCLK, ... etc.). For example, if an LTC1164-8 filter

operates with a 100kHz clock and has a 99kHz, 10mV

signal at its input, a 1kHz, 10mV alias signal will appear

at the filter’s output. Table 5 shows details.

Table 5. Aliasing (fCLK = 100kHz)

OUTPUT LEVEL

INPUT FREQUENCY (RELATIVE TO INPUT)

99.04kHz

(or 100.96kHz)

< – 50dB

99.02kHz

(or 100.98kHz)

< – 40dB

99.01kHz

(or 100.99kHz)

< – 6dB

99.005kHz

(or 100.995Hz)

– 3dB ±2dB

99.00kHz

(or 101.00kHz)

0dB ±1dB

98.995kHz

(or 101.005kHz)

– 3dB ±2dB

98.99kHz

(or 101.01kHz)

< – 6dB

98.98kHz

(or 101.02kHz)

< – 40dB

98.96kHz

(or 101.04kHz)

< – 50dB

OUTPUT FREQUENCY

(ALIAS FREQUENCY)

960Hz

980Hz

990Hz

995Hz

1000Hz

1005Hz

1010Hz

1020Hz

1040Hz

B

LT1006

VS = ±5V

fCLK = 100kHz

5µs/DIV

LTC1164-8 • F04

Figure 4. Clock Feedthrough at the Output of External Op Amp

A. With No Capacitor Across Feedback Resistor RF

B. With Capacitor CF Across Feedback Resistor RF

1/(2π • RF • CF) = 10 • fCENTER

Transient Response

OUTPUT

INPUT

VS = ±5V

fCLK = 500kHz

fCENTER = 5kHz

5ms/DIV

LTC1164-8 • F05

Figure 5. Square Wave Input (±2.5V)

OUTPUT

8

INPUT

VS = ±5V

fCLK = 100kHz

fCENTER = 1kHz

50ms/DIV

LTC1164-8 • F06

Figure 6. Sine Wave Burst Input

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