Datasheet

____________________________Typical Operating Characteristics (continued)
(V
DD
= +5V for MAX7418–MAX7421, V
DD
= +3V for MAX7422–MAX7425; f
CLK
= 2.2MHz; SHDN = V
DD
; V
COM
= V
OS
= V
DD
/ 2;
T
A
= +25°C; unless otherwise noted.)
MAX7418–MAX7425
5th-Order, Lowpass,
Switched-Capacitor Filters
8 _______________________________________________________________________________________
-90
-70
-80
-40
-50
-60
-30
-20
-10
0
0 0.5 1.0 1.5 2.0 2.5 3.0
MAX7424
THD + NOISE vs. INPUT SIGNAL AMPLITUDE
(BUTTERWORTH)
MAX7418 toc19
AMPLITUDE (Vp-p)
THD + N (dB)
B
A
C
SEE TABLE A
-90
-70
-80
-40
-50
-60
-30
-20
-10
0
0 0.5 1.0 1.5 2.0 2.5 3.0
MAX7425
THD + NOISE vs. INPUT SIGNAL AMPLITUDE
(ELLIPTIC, R = 1.25)
MAX7418 toc20
AMPLITUDE (Vp-p)
THD + N (dB)
B
A
C
SEE TABLE A
0
2000
1000
4000
3000
6000
5000
7000
INTERNAL OSCILLATOR FREQUENCY
vs. SMALL CAPACITANCE (pF)
MAX7418 toc21
CAPACITANCE ( pF)
OSCILLATOR FREQUENCY (kHz)
1 10 100 1000 10000
ELLIPTIC
BESSEL/BUTTERWORTH
0
2
1
4
3
5
6
10 100 1000
INTERNAL OSCILLATOR FREQUENCY
vs. LARGE CAPACITANCE (nF)
MAX7418 toc22
CAPACITANCE (nF)
OSCILLATOR REQUENCY (Hz)
ELLIPTIC
BESSEL/BUTTERWORTH
2.3
2.5
2.9
2.7
3.1
3.3
2.5 3.53.0 4.0 4.5 5.0 5.5
ELLIPTIC SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX7418 toc25
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (μA)
84.0
85.0
84.5
86.0
85.5
86.5
87.0
2.5 3.5 4.03.0 4.5 5.0 5.5
ELLIPTIC INTERNAL OSCILLATOR
FREQUENCY vs. SUPPLY VOLTAGE
MAX7418 toc23
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
C
OSC
= 1000PF
84.0
85.0
84.5
86.0
85.5
86.5
87.0
-40 10-15 35 60 85
ELLIPTIC INTERNAL OSCILLATOR
FREQUENCY vs. TEMPERATURE
MAX7418 toc24
TEMPERATURE (
°
C)
OSCILLATOR FREQUENCY (kHz)
V
DD
= 3V
V
DD
= 5V
C
OSC
= 1000PF
2.5
2.6
2.8
2.7
2.9
3.0
-40 10-15 35 60 85
ELLIPTIC SUPPLY CURRENT
vs. TEMPERATURE
MAX7418 toc26
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
V
DD
= 5V
V
DD
= 3V
1
f
IN
(kHz)
2
2
1
2
10
f
C
(kHz)
E
30
22
10
22
1000
LABEL
A
B
f
CLK
(kHz)
3000
2200
1000C
D 2200
22
BW
(kHz)
80
80
22
80
Table A.