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MAX271ENG Datasheet(PDF) 5 Page - Analog Devices

Part # MAX271ENG
Description  Digitally-Programmed, Dual 2nd-Order Continuous Lowpass Filter
PDF  16 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

MAX271ENG Datasheet(HTML) 5 Page - Analog Devices

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5
Maxim Integrated
Digitally-Programmed, Dual
2nd-Order Continuous Lowpass Filter
MAX270/MAX271
Typical Operating Characteristics (continued)
fIN/fC
0.1
-1.5
-0.5
-3.5
-2.5
-5.5
-4.5
-7.5
-6.5
+0.5
0.01
1.0
CASCADED FILTER GAIN vs. FREQUENCY
(NORMALIZED TO CUTOFF FREQUENCY)
V+ = +5V
V- = -5V
fC (FILTER A) = fC (FILTER B) =
0-127 (1-25kHz TYP)
FILTERS A AND B CASCADED
FIGURE 5
TA = +25˚C
fIN/fC
1.0
-80
-20
-40
-60
0
0.01
10
CASCADED FILTER GAIN vs. FREQUENCY
(NORMALIZED TO CUTOFF FREQUENCY)
V+ = +5V
V- = -5V
fC (FILTER A) = fC (FILTER B) =
0-127 (1-25kHz TYP)
FILTERS A AND B CASCADED
FIGURE 5
TA = +25˚C
F (Hz)
1k
2k
3k
-120
-20
-40
-100
-80
-60
0
04k
FILTER HARMONIC DISTORTION
V+ = +5V
V- = -5V
fC CODE = 44 (2.01kHz TYP)
fTEST = 390.625Hz
TA = +25˚C
VIN = 3.5VP-P
V+ = 5V, V- = -5V; VIN = 3.5VP-P; TA = +25˚C
FILTER TOTAL HARMONIC DISTORTION
PLUS NOISE vs.INPUT FREQUENCY
fIN
(Hz)
fC
CODE
fC
(Hz)
(TYP)
THD PLUS
NOISE
(TYP)
190
01k
-78
390
1367
4875
44
100
127
2.01k
7.01k
25k
-73
-67
-66
VIN (VP-P)
1.0
-85
-60
-65
-70
-75
-80
0.2
8.0
FILTER TOTAL HARMONIC DISTORTION
PLUS NOISE vs. INPUT AMPLITUDE
V+ = +5V
V- = -5V
fIN = 390.625Hz
fC CODE = 44 (2.01kHz TYP)
TA = +25˚C
MAX271 FILTER PLUS TRACK-AND-HOLD
SPURIOUS-FREE DYNAMIC RANGE
vs. SAMPLING FREQUENCY
fSAMPLE
(Hz)
100k
200k
500k
fIN
(Hz)
781
1562
3906
fC
CODE
72
105
124
SFDR
(dB)
72
72
64
fC
(Hz)
4.01k
8.08k
19.4k
V+ = 5V, V- = -5V; VIN = 3.5VP-P;
T/H SWITCHED AT 50kHz, 50% DUTY CYCLE; TA = +25˚C
VIN (VP-P)
1.0
-85
55
65
75
0.5
8.0
MAX271 FILTER PLUS TRACK-AND-HOLD
SPURIOUS-FREE DYNAMIC RANGE
vs. INPUT AMPLITUDE
V+ = +5V
V- = -5V
fIN = 390Hz
fC CODE = 44 (2.01kHz TYP)
TA = +25˚C
MAX271 FILTER PLUS TRACK-AND-HOLD
SPURIOUS-FREE DYNAMIC RANGE
vs. INPUT FREQUENCY
fIN
(Hz)
fC
CODE
fC
(Hz)
(TYP)
SFDR
(dB)
195
01k
73.5
781
1562.5
3906
72
105
124
4.01k
8.08k
19.4k
69.5
66
61.5
V+ = 5V, V- = -5V; VIN = 3.5VP-P;
T/H SWITCHED AT 50kHz, 50% DUTY CYCLE; TA = +25˚C



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