User Manual

MAX7418–MAX7425
5th-Order, Lowpass,
Switched-Capacitor Filters
4 _______________________________________________________________________________________
FILTER CHARACTERISTICS
(V
DD
= +5V for MAX7418–MAX7421, V
DD
= +3V for MAX7422–MAX7425 filter output measured at OUT, 10kΩ
|| 50pF load to GND at
OUT, SHDN = V
DD
, f
CLK
= 2.2MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS—MAX7422–MAX7425 (continued)
(V
DD
= +3V, filter output measured at OUT pin, 10kΩ || 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND,
SHDN = V
DD
, f
CLK
= 2.2MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
CONDITIONS MIN TYP MAXSYMBOLPARAMETER
Measured at DC
SHDN = GND
0.5V
SDL
SHDN Input Low
2.5V
SDH
SHDN Input High
70PSRRPower-Supply Rejection Ratio
0.2 1I
SHDN
Shutdown Current
2.6 3.4
2.7 3.6V
DD
Supply Voltage
V
V
dB
µA
V
UNITS
SHDN Input Leakage Current
V
SHDN
= 0 to V
DD
±0.2 ±10 µA
C
OSC
= 1000pF
(Note 3)
68 87 106
f
OSC
Internal Oscillator Frequency kHz
0.5V
IL
Clock Input Low V
2.5V
IH
Clock Input High V
68 87 106
I
CLK
Clock Output Current (Internal
Oscillator Mode)
kHz
MAX7422/MAX7425
MAX7423/MAX7424 86 110 135
MAX7422/MAX7425
MAX7423/MAX7424 86 110 135
Operating mode,
no load
3.0 3.8
Supply Current I
DD
mA
MAX7422/MAX7425
MAX7423/MAX7424
MIN TYP MAXCONDITIONSPARAMETER
-0.4 ±0.2 0.4f
IN
= 0.38f
C
UNITS
Insertion Gain with DC Gain
Error Removed (Note 4)
dB
f
IN
= 0.68f
C
-0.4 ±0.2 0.4
-0.4 ±0.2 0.4f
IN
= 0.87f
C
-36 -33f
IN
= 1.25f
C
f
IN
= 0.97f
C
-0.4 ±0.2 0.4
-0.7 ±0.2 0.2f
IN
= f
C
f
IN
= 1.43f
C
-37.2 -35
-1 -0.74f
IN
= 0.5f
C
f
IN
= 3.25f
C
-37.2 -35
Insertion Gain Relative to
DC Gain
dB
f
IN
= f
C
-3.6 -3.0 -2.4
f
IN
= 4f
C
-41.0 -35
-67 -60f
IN
= 7f
C
CLOCK
POWER REQUIREMENTS
ELLIPTIC, r = 1.2—MAX7421/MAX7425
BESSEL FILTERS—MAX7419/MAX7423
SHUTDOWN