LTC1164-6MJ 查看數據表（PDF） - Linear Technology

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LTC1164-6MJ

Low Power 8th Order Pin Selectable Elliptic or Linear Phase Lowpass Filter

Linear Technology 

LTC1164-6

APPLICATI S I FOR ATIO

and 1kHz cutoff frequency receives a 98.5kHz, 10mVRMS

input signal, a 1.5kHz, 10µVRMS alias signal will appear at

its output. When the LTC1164-6 operates with a clock-to-

cutoff frequency of 50:1, aliasing occurs at twice the clock

frequency. Table 5 shows details.

Table 4. Maximum VIN vs VS and fCLK

POWER SUPPLY

±7.5V

MAXIMUM fCLK

1.5MHz

1MHz

≥ 1MHz

±5V

1MHz

1MHz

Single 5V

1MHz

1MHz

MAXIMUM VIN

1VRMS (fIN > 35kHz)

3VRMS (fIN > 25kHz)

0.7VRMS (fIN > 250kHz)

2.5VRMS (fIN > 25kHz)

0.5VRMS (fIN > 100kHz)

0.7VRMS (fIN > 25kHz)

0.5VRMS (fIN > 100kHz)

Table 5. Aliasing (fCLK = 100kHz)

INPUT FREQUENCY

(VIN = 1VRMS)

(kHz)

OUTPUT LEVEL

(Relative to Input)

(dB)

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

96 (or 104)

– 75.0

97 (or 103)

– 68.0

98 (or 102)

– 65.0

98.5 (or 101.5)

– 60.0

99 (or 101)

– 3.2

99.5 (or 100.5)

– 0.5

fCLK/fC = 50:1, fCUTOFF = 2kHz

192 (or 208)

– 76.0

194 (or 206)

– 68.0

196 (or 204)

– 63.0

198 (or 202)

– 3.4

199 (or 201)

– 1.3

199.5(or 200.5)

– 0.9

OUTPUT FREQUENCY

(Aliased Frequency)

(kHz)

4.0

3.0

2.0

1.5

1.0

0.5

8.0

6.0

4.0

2.0

1.0

0.5

Table 6. Transient Response of LTC Lowpass Filters

LOWPASS FILTER

DELAY

TIME*

(SEC)

RISE SETTLING OVER-

TIME** TIME*** SHOOT

(SEC) (SEC) (%)

LTC1064-3 Bessel

LTC1164-5 Linear Phase

LTC1164-6 Linear Phase

0.50/fC 0.34/fC 0.80/fC 0.5

0.43/fC 0.34/fC 0.85/fC 0

0.43/fC 0.34/fC 1.15/fC 1

LTC1264-7 Linear Phase 1.15/fC 0.36/fC 2.05/fC 5

LTC1164-7 Linear Phase 1.20/fC 0.39/fC 2.20/fC 5

LTC1064-7 Linear Phase 1.20/fC 0.39/fC 2.20/fC 5

LTC1164-5 Butterworth

0.80/fC 0.48/fC 2.40/fC 11

LTC1164-6 Elliptic

0.85/fC 0.54/fC 4.30/fC 18

LTC1064-4 Elliptic

0.90/fC 0.54/fC 4.50/fC 20

LTC1064-1 Elliptic

0.85/fC 0.54/fC 6.50/fC 20

* To 50% ±5%, ** 10% to 90% ±5%, *** To 1% ±0.5%

ts

INPUT

90%

OUTPUT

50%

td

10%

tr

RISE

TIME

(tr)

=

0.54

fCUTOFF

±5%

SETTLING

(TO 1% of

TIME (ts)

OUTPUT)

=

4.3

fCUTOFF

±5%

TIME DELAY (td) = GROUP

(TO 50% OF OUTPUT)

DELAY

≈

0.85

fCUTOFF

Figure 4

1164-6 F04

TYPICAL APPLICATI S

VIN

V+

0.1µF

8th Order Elliptic Lowpass Filter

(fCLK/ fC) = 50:1

1

14

2

13

3

12

4 LTC1164-6 11 fCLK

5

10 V+

6

9

V–

0.1µF

R

7

8

VOUT

V+

–

LT®1006

+

C

V–

NOTES:

1. OPTIONAL OUTPUT BUFFER

1/2πRC = (2)(fCUTOFF)

2. PINS 1, 8, 13 CAN BE GROUNDED

OR LEFT FLOATING

1164-6 TA06

11646fa

9

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