MAX7424 Datasheet PDF - Maxim Integrated
Part Number | MAX7424 | |
Description | 5th-Order / Lowpass / Switched-Capacitor Filters | |
Manufacturers | Maxim Integrated | |
Logo | ||
There is a preview and MAX7424 download ( pdf file ) link at the bottom of this page. Total 14 Pages |
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5th-Order, Lowpass,
Switched-Capacitor Filters
General Description
The MAX7418–MAX7425 5th-order, low-pass, switched-
capacitor filters (SCFs) operate from a single +5V
(MAX7418–MAX7421) or +3V (MAX7422–MAX7425)
supply. These devices draw only 3mA of supply current
and allow corner frequencies from 1Hz to 45kHz, mak-
ing them ideal for low-power post-DAC filtering and anti-
aliasing applications. They feature a shutdown mode
that reduces supply current to 0.2µA.
Two clocking options are available: self-clocking
(through the use of an external capacitor), or external
clocking for tighter corner-frequency control. An offset
adjust pin allows for adjustment of the DC output level.
The MAX7418/MAX7422 deliver 53dB of stopband
rejection and a sharp rolloff with a 1.6 transition ratio.
The MAX7421/MAX7425 achieve a sharper rolloff with a
1.25 transition ratio while still providing 37dB of stop-
band rejection. The MAX7419/MAX7423 Bessel filters
provide low overshoot and fast settling, and the
MAX7420/MAX7424 Butterworth filters provide a maxi-
mally flat passband response. Their fixed response sim-
plifies the design task of selecting a clock frequency.
Applications
ADC Anti-Aliasing
DAC Postfiltering
CT2 Base Stations
Speech Processing
Selector Guide
PART
FILTER RESPONSE
OPERATING
VOLTAGE (V)
MAX7418
r = 1.6
+5
MAX7419
Bessel
+5
MAX7420
Butterworth
+5
MAX7421
r = 1.25
+5
Selector Guide continued at end of data sheet.
Pin Configuration
TOP VIEW
COM 1
IN 2
GND 3
VDD 4
MAX7418–
MAX7425
8 CLK
7 SHDN
6 OS
5 OUT
Features
o 5th-Order, Lowpass Filters
Elliptic Response (MAX7418/MAX7421/
MAX7422/MAX7425)
Bessel Response (MAX7419/MAX7423)
Butterworth Response (MAX7420/MAX7424)
o Clock-Turnable Corner Frequency (1Hz to 45kHz)
o Single-Supply Operation
+5V (MAX7418–MAX7421)
+3V (MAX7422–MAX7425)
o Low Power
3mA (Operating Mode)
0.2µA (Shutdown Mode)
o Available in 8-Pin µMAX Package
o Low Output Offset: ±4mV
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX7418CUA
0°C to +70°C
8 µMAX
MAX7418EUA
-40°C to +85°C 8 µMAX
MAX7419CUA
0°C to +70°C
8 µMAX
MAX7419EUA
-40°C to +85°C 8 µMAX
MAX7420CUA
0°C to +70°C
8 µMAX
MAX7420EUA
-40°C to +85°C 8 µMAX
MAX7421CUA
0°C to +70°C
8 µMAX
MAX7421EUA
-40°C to +85°C 8 µMAX
Ordering Information continued at end of data sheet.
Typical Operating Circuit
VSUPPLY
0.1µF
INPUT
CLOCK
VDD SHDN
IN OUT
MAX7418–
MAX7425
CLK COM
OS
GND
OUTPUT
0.1µF
µMAX
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
|
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5th-Order, Lowpass,
Switched-Capacitor Filters
FILTER CHARACTERISTICS
(VDD = +5V for MAX7418-MAX7420, VDD = +3V for MAX7422-MAX7425 filter output measured at OUT, 10kΩ || 50pF load to GND at
OUT, SHDN = VDD, fCLK = 2.2MHz, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
ELLIPTIC, R = 1.2—MAX7421/MAX7425
fIN = 0.38fC
Insertion Gain with DC Gain
Error Removed (Note 4)
fIN = 0.68fC
fIN = 0.87fC
fIN = 0.97fC
fIN = fC
fIN = 1.25fC
fIN = 1.43fC
fIN = 3.25fC
BESSEL FILTERS—MAX7419/MAX7423
Insertion Gain Relative to
DC Gain
fIN = 0.5fC
fIN = fC
fIN = 4fC
fIN = 7fC
BESSEL FILTERS—MAX7419/MAX7423
fIN = 0.5fC
Insertion Gain Relative to
DC Gain
fIN = 4fC
fIN = 7fC
fIN = 7fC
BEUSTTSERLWFIOLRTETRHSF—ILMTEARXS74—0M9/AMXA7X472401/M3 AX7424
fIN = 0.5fC
Insertion Gain Relative to
DC Gain
fIN = fC
fIN = 3fC
fIN = 5fC
CONDITIONS
MIN TYP MAX UNITS
-0.4 -0.2
0.4
-0.4 -0.2
0.4
-0.4 -0.2
0.4
-0.4 -0.2
0.4
-0.7 -0.2
0.2
-36 -33
-37.2 -35
-37.2 -35
dB
-1 -0.74
-3.6 -3.0 -2.4
-41.0 -35
-67 -60
dB
-1.0 -0.74
-3.6 -3.0 -2.4
-41.0 -35
-67 -60
dB
-0.3 0
-3.6 -3.0 -2.4
-47.5 -43
-70 -65
dB
Note 1: The maximum fC is defined as the clock frequency fCLK = 100 x fC at which the peak S / (THD+N) drops to 68dB with a
sinusoidal input at 0.2fC. Maximum fC increases as VIN signal amplitude decreases.
Note 2: DC insertion gain is defined as ΔVOUT / ΔVIN.
Note 3: MAX7418/MAX7421/MAX7422/MAX7425: fOSC (kHz) ≅ 87x103 / COSC (pF).
MAX7419/MAX7420/MAX7423/MAX7424: fOSC (kHz) ≅ 110x103 / COSC (pF).
Note 4: PSRR is the change in output voltage from a VDD of 4.5V and a VDD of 5.5V.
_______________________________________________________________________________________ 5
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Information | Total 14 Pages | |
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