Datasheet

MAX7490/MAX7491
Dual Universal Switched-Capacitor Filters
6 _______________________________________________________________________________________
-0.6
-0.4
-0.5
-0.3
-0.2
-0.1
0
0.1
0.2
04020 60 80 100
CLOCK-TO-CENTER FREQUENCY
DEVIATION vs. Q
MAX7490-04
Q
f
CLK
/f
O
DEVIATION (%)
V
DD
= 5V
V
DD
= 3V
-0.7
-0.3
-0.4
-0.6
-0.2
-0.5
-0.1
0
0.1
0.3
0.2
0.4
0.5
0.6
0.7
-40 10-15 35 60 85
CLOCK-TO-CENTER FREQUENCY
DEVIATION vs. TEMPERATURE
MAX7490-05
TEMPERATURE (
°
C)
f
CLK
/f
O
DEVIATION (%)
1
-6
100 1000 10,000
Q DEVIATION vs. CLOCK FREQUENCY
-5
MAX7490-06
f
CLK
(kHz)
Q DEVIATION (%)
-4
-1
-2
-3
0
V
DD
= 3V
V
DD
= 5V
-2.0
-1.0
-1.5
-0.5
0
0.5
1.0
1.5
2.0
-40 10-15 35 60 85
Q DEVIATION vs. TEMPERATURE
MAX7490-07
TEMPERATURE (°C)
Q DEVIATION (%)
0
150
100
50
200
250
300
350
400
450
500
04020 60 80 100
NOISE vs. Q
MAX7490-08
Q
NOISE (µV
RMS
)
3.0
3.2
3.1
3.4
3.3
3.6
3.5
3.7
-40 10-15 356085
SUPPLY CURRENT vs. TEMPERATURE
MAX7490-09
TEMPERATURE (°C)
I
DD
(mA)
V
DD
= 5V
V
DD
= 3V
3.0
3.3
3.2
3.1
3.4
3.5
3.6
3.7
3.8
3.9
4.0
3.0 4.03.5 4.5 5.0 5.5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX7490-10
V
DD
(V)
I
DD
(mA)
f
CLK
= 3MHz
f
CLK
= 625kHz
f
CLK
= 2kHz
3.32
3.34
3.33
3.37
3.36
3.35
3.40
3.39
3.38
3.41
3.0 4.03.5 4.5 5.0 5.5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX7490-11
V
DD
(V)
I
DD
(mA)
-40°C
+25°C
+85°C
-20
-120
1k 10k
MAX7491
THD + NOISE vs. FREQUENCY
MAX7490-12
INPUT FREQUENCY (Hz)
THD + NOISE (dB)
-30
-40
-50
-60
-70
-80
-90
-100
-110
A
B
A = MODE 1
B = MODE 3
Typical Operating Characteristics (continued)
(V
DD
= +5V for MAX7490, V
DD
= +3V for MAX7491, f
CLK
= 625kHz, V
SHDN
= V
EXTCLK
= V
DD
, COM = V
DD
/2, Mode 1, R3 = R1 = 50kΩ,
R2 = 10kΩ, Q = 5, T
A
= +25°C, unless otherwise noted.)