MAX271CWG(2012) 查看數據表（PDF） - Maxim Integrated

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MAX271CWG
(Rev.:2012)

Digitally-Programmed, Dual 2nd-Order Continuous Lowpass Filter

Maxim Integrated 

MAX270/MAX271

Digitally-Programmed, Dual

2nd-Order Continuous Lowpass Filter

Typical Operating Characteristics (continued)

CASCADED FILTER GAIN vs. FREQUENCY

(NORMALIZED TO CUTOFF FREQUENCY)

+0.5

-0.5

-1.5

-2.5

-3.5

V+ = +5V

-4.5

V- = -5V

fC (FILTER A) = fC (FILTER B) =

-5.5

0-127 (1-25kHz TYP)

FILTERS A AND B CASCADED

-6.5

FIGURE 5

TA = +25˚C

-7.5

0.01

0.1

1.0

fIN/fC

FILTER TOTAL HARMONIC DISTORTION

PLUS NOISE vs.INPUT FREQUENCY

fIN

(Hz)

fC

CODE

fC

(Hz)

(TYP)

THD PLUS

NOISE

(TYP)

190

0

1k

-78

390

44

2.01k

-73

1367

100

7.01k

-67

4875

127

25k

-66

V+ = 5V, V- = -5V; VIN = 3.5VP-P; TA = +25˚C

CASCADED FILTER GAIN vs. FREQUENCY

(NORMALIZED TO CUTOFF FREQUENCY)

0

-20

-40 V+ = +5V

V- = -5V

fC (FILTER A) = fC (FILTER B) =

-60

0-127 (1-25kHz TYP)

FILTERS A AND B CASCADED

FIGURE 5

TA = +25˚C

-80

0.01

1.0

10

fIN/fC

FILTER TOTAL HARMONIC DISTORTION

PLUS NOISE vs. INPUT AMPLITUDE

-60

V+ = +5V

-65

V- = -5V

fIN = 390.625Hz

fC CODE = 44 (2.01kHz TYP)

-70

TA = +25˚C

-75

-80

-85

0.2

1.0

8.0

VIN (VP-P)

FILTER HARMONIC DISTORTION

0

-20

V+ = +5V

V- = -5V

-40

fC CODE = 44 (2.01kHz TYP)

fTEST = 390.625Hz

-60

TA = +25˚C

VIN = 3.5VP-P

-80

-100

-120

0

1k

2k

3k

4k

F (Hz)

MAX271 FILTER PLUS TRACK-AND-HOLD

SPURIOUS-FREE DYNAMIC RANGE

vs. INPUT FREQUENCY

fIN

(Hz)

fC

CODE

fC

(Hz)

(TYP)

SFDR

(dB)

195

0

1k

73.5

781

72

4.01k

69.5

1562.5 105

8.08k

66

3906

124

19.4k

61.5

V+ = 5V, V- = -5V; VIN = 3.5VP-P;

T/H SWITCHED AT 50kHz, 50% DUTY CYCLE; TA = +25˚C

MAX271 FILTER PLUS TRACK-AND-HOLD

SPURIOUS-FREE DYNAMIC RANGE

vs. INPUT AMPLITUDE

MAX271 FILTER PLUS TRACK-AND-HOLD

SPURIOUS-FREE DYNAMIC RANGE

vs. SAMPLING FREQUENCY

55 V+ = +5V

V- = -5V

fIN = 390Hz

fC CODE = 44 (2.01kHz TYP)

65 TA = +25˚C

fSAMPLE fIN

fC

fC SFDR

(Hz) (Hz) CODE (Hz) (dB)

100k 781 72 4.01k 72

75

-85

0.5

1.0

8.0

VIN (VP-P)

Maxim Integrated

200k 1562 105 8.08k 72

500k 3906 124 19.4k 64

V+ = 5V, V- = -5V; VIN = 3.5VP-P;

T/H SWITCHED AT 50kHz, 50% DUTY CYCLE; TA = +25˚C

  5

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