User Manual

MAX7418–MAX7425
5th-Order, Lowpass,
Switched-Capacitor Filters
_______________________________________________________________________________________ 3
Corner-Frequency Range
0.001 to 45
5th-Order, Lowpass,
Switched-Capacitor Filters
ELECTRICAL CHARACTERISTICS—MAX7418–MAX7421 (continued)
(V
DD
= +5V, filter output measured at OUT, 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.)
ELECTRICAL CHARACTERISTICS—MAX7422–MAX7425
(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.)
FILTER CHARACTERISTICS
0.001 to 45
MAX7423/MAX7424
MAX7422/MAX7425
-0.2 0 +0.2MAX7423/MAX7424
MAX7422/MAX7425
UNITS
kHz
ppm/°C
V
mV
dB
V/V
V
kΩ
mVp-p
kΩ
pF
µA
µA
PARAMETER SYMBOL MIN TYP MAX
DC Insertion Gain with Output
Offset Removed
0 0.2 0.4
Output Offset Voltage V
OFFSET
±4 ±25
Output Voltage Range 0.25 V
DD
- 0.25
Clock-to-Corner Tempco 10
Offset Voltage Gain A
OS
1
V
COM
f
C
Clock-to-Corner Ratio f
CLK
/f
C
100:1
Input Voltage Range at OS V
OS
V
COM
±0.1
Input Resistance at COM R
COM
100 140
Clock Feedthrough 3
Resistive Output Load Drive R
L
10 1
C
L
50 500
Input Leakage Current at COM ±0.1 ±10
Input Leakage Current at OS ±0.1 ±10
CONDITIONS
V
COM
= V
DD
/ 2
(Note 2)
V
IN
= V
COM
= V
DD
/ 2
Measured with respect to COM
OS to OUT
V
IN
= 2.5Vp-p
(Note 1)
SHDN = GND, V
COM
= 0 to V
DD
V
OS
= 0 to V
DD
Maximum Capacitive Load
at OUT
-81MAX7423
MAX7422 -80
-80MAX7425
MAX7424
dB
Total Harmonic Distortion plus
Noise
THD+N
-70
f
IN
= 2kHz,
V
IN
= 2.5Vp-p,
measurement
bandwidth = 80kHz
1.4 1.5 1.6Input, COM externally driven
VCOM Voltage Range
1.4 1.5 1.6Output, COM internally driven
FILTER CHARACTERISTICS
SHUTDOWN
POWER REQUIREMENTS
3.4 4.1MAX7419/MAX7420
MAX7418/MAX7421
µA±0.2 ±10
V
SHDN
= 0 to V
DD
SHDN Input Leakage Current
UNITS
V
mA
µA
dB
V
V
Supply Voltage V
DD
4.5 5.5
I
DD
Supply Current
2.9 3.6
Shutdown Current I
SHDN
0.2 1
Power-Supply Rejection Ratio PSRR 70
SHDN Input High
V
SDH
4.5
SHDN Input Low
V
SDL
0.5
Operating mode,
no load
SHDN = GND
IN = COM (Note 4)
PARAMETER SYMBOL MIN TYP MAXCONDITIONS