MAX7490-MAX7491 查看數據表（PDF） - Maxim Integrated
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MAX7490-MAX7491 Datasheet PDF : 18 Pages
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Dual Universal Switched-Capacitor Filters
Typical Operating Characteristics (continued)
(VDD = +5V for MAX7490, VDD = +3V for MAX7491, fCLK = 625kHz, VSHDN = VEXTCLK = VDD, COM = VDD/2, Mode 1, R3 = R1 = 50kΩ,
R2 = 10kΩ, Q = 5, TA = +25°C, unless otherwise noted.)
MAX7490
THD + NOISE vs. FREQUENCY
-20
A = MODE 1
-30 B = MODE 3
-40
-50
-60
B
-70
-80
A
-90
-100
-110
-120
1k
10k
INPUT FREQUENCY (Hz)
MAX7491
THD + NOISE vs. INPUT VOLTAGE
-10
A = MODE 1
-20
B = MODE 3
-30
-40
-50
-60
B
-70
-80
A
-90
0
0.5 1.0 1.5 2.0 2.5 3.0
INPUT VOLTAGE (Vp-p)
MAX7490
THD + NOISE vs. INPUT VOLTAGE
-10
A = MODE 1
-20
B = MODE 3
-30
-40
-50
-60
-70
B
-80
A
-90
0
1
2
3
4
5
INPUT VOLTAGE (Vp-p)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
0
OUTPUT VOLTAGE SWING
vs. LOAD RESISTANCE
INTERNAL OSCILLATOR PERIOD
vs. SMALL CAPACITANCE
2500
INTERNAL OSCILLATOR PERIOD
vs. LARGE CAPACITANCE
160
140
VDD = 5V
2000
120
VDD = 3V
4
8
12
16
20
RLOAD (kΩ) TO COM
1500
1000
VDD = 3V
500
VDD = 5V
0
0
200 400 600 800 1000
CAPACITANCE (pF)
100
80
VDD = 3V
60
40
VDD = 5V
20
0
1234567
CAPACITANCE (nF)
INTERNAL OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
133
COSC = 1000pF
132
131
130
129
128
127
126
3.0 3.5 4.0 4.5 5.0 5.5
VDD (V)
INTERNAL OSCILLATOR FREQUENCY
vs. TEMPERATURE
144
142 COSC = 1000pF
140
138
VDD = 3V
136
134
132
130
VDD = 5V
128
126
124
-40 -15
10
35
60
85
TEMPERATURE (°C)
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