MAX7408EUA ,5th-Order, Lowpass, Elliptic, Switched-Capacitor FiltersApplicationsMAX7408EPA -40°C to +85°C 8 Plastic DIPADC Anti-Aliasing CT2 Base StationsMAX7408EUA -4 ..
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MAX7408EUA
5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
General DescriptionThe MAX7408/MAX7411/MAX7412/MAX7415 5th-order,
lowpass, elliptic, switched-capacitor filters (SCFs) oper-
ate from a single +5V (MAX7408/MAX7411) or +3V
(MAX7412/MAX7415) supply. The devices draw only
1.2mA of supply current and allow corner frequencies
from 1Hz to 15kHz, making them ideal for low-power
post-DAC filtering and anti-aliasing applications. They
can be put into a low-power mode, reducing supply
current to 0.2µA.
Two clocking options are available: self-clocking (through
the use of an external capacitor) or external clocking for
tighter cutoff-frequency control. An offset-adjust pin
allows for adjustment of the DC output level.
The MAX7408/MAX7412 deliver 53dB of stopband
rejection and a sharp rolloff with a transition ratio of 1.6.
The MAX7411/MAX7415 achieve a sharper rolloff with a
transition ratio of 1.25 while still providing 37dB of stop-
band rejection. Their fixed response limits the design
task to selecting a clock frequency.
ApplicationsADC Anti-AliasingCT2 Base Stations
Post-DAC FilteringSpeech Processing
Features5th-Order, Elliptic Lowpass FiltersLow Noise and Distortion: -80dB THD + NoiseClock-Tunable Corner Frequency (1Hz to 15kHz)Single-Supply Operation
+5V (MAX7408/MAX7411)
+3V (MAX7412/MAX7415)Low Power
1.2mA (operating mode)
0.2µA (shutdown mode)Available in 8-Pin µMAX/DIP PackagesLow Output Offset: ±4mV
MAX7408/MAX7411/MAX7412/MAX7415
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
Typical Operating Circuit19-1378; Rev 1; 10/98
Pin Configuration
Ordering Information
Selector Guide
MAX7408/MAX7411/MAX7412/MAX7415
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—MAX7408/MAX7411(VDD= +5V; filter output measured at OUT, 10kΩ||50pF load to GND at OUT, SHDN= VDD, OS = COM, 0.1µF from COM to GND,
fCLK= 100kHz, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDDto GND..............................................................-0.3V to +6V
IN, OUT, COM, OS, CLK, SHDN................-0.3V to (VDD+ 0.3V)
OUT Short-Circuit Duration...................................................1sec
Continuous Power Dissipation (TA= +70°C)
8-Pin DIP (derate 6.90mW/°C above +70°C)...............552mW
8-Pin µMAX (derate 4.1mW/°C above +70°C).............330mW
Operating Temperature Ranges
MAX74_ _C_A.....................................................0°C to +70°C
MAX74_ _E_A..................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX7408/MAX7411/MAX7412/MAX7415
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
ELECTRICAL CHARACTERISTICS—MAX7408/MAX7411 (continued)(VDD= +5V; filter output measured at OUT, 10kΩ||50pF load to GND at OUT, SHDN= VDD, OS = COM, 0.1µF from COM to GND,
fCLK= 100kHz, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS—MAX7412/MAX7415(VDD= +3V, filter output measured at OUT pin, 10kΩ||50pF load to GND at OUT, SHDN= VDD, OS = COM, 0.1µF from COM to
GND, fCLK= 100kHz; TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
MAX7408/MAX7411/MAX7412/MAX7415
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
ELECTRICAL CHARACTERISTICS—MAX7412/MAX7415 (continued)(VDD= +3V, filter output measured at OUT pin, 10kΩ||50pF load to GND at OUT, SHDN= VDD, OS = COM, 0.1µF from COM to
GND, fCLK= 100kHz; TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
ELLIPTICFILTER(r = 1.6) CHARACTERISTICS—MAX7408/MAX7412(VDD= +5V for MAX7408, VDD= +3V for MAX7412; filter output measured at OUT; 10kΩ||50pF load to GND at OUT; SHDN= VDD;
VCOM = VOS =VDD / 2; fCLK= 100kHz; TA = TMINto TMAX;unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
MAX7408/MAX7411/MAX7412/MAX7415
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
ELLIPTICFILTER(r = 1.25) CHARACTERISTICS—MAX7411/MAX7415(VDD= +5V for MAX7411, VDD= +3V for MAX7415; filter output measured at OUT; 10kΩ||50pF load to GND at OUT; SHDN= VDD,
VCOM = VOS =VDD / 2; fCLK= 100kHz; TA = TMINto TMAX;unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
Note 1:The maximum fCis defined as the clock frequency fCLK= 100 ·fCat which the peak SINAD drops to 68dB with a sinusoidal
input at 0.2fC.
Note 2:DC insertion gain is defined as ΔVOUT / ΔVIN.
Note 3:fOSC(kHz) ≈ 27 ·103/ COSC(COSCin pF).
Note 4:The input frequencies, fIN, are selected at the peaks and troughs of the ideal elliptic frequency responses.
Typical Operating Characteristics (VDD= +5V for MAX7408/MAX7411, VDD= +3V for MAX7412/MAX7415; fCLK= 100kHz; SHDN= VDD; VCOM= VOS= VDD/ 2; = +25°C; unless otherwise noted.)
MAX7408/MAX7411/MAX7412/MAX7415
5th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
Typical Operating Characteristics (continued)(VDD= +5V for MAX7408/MAX7411, VDD= +3V for MAX7412/MAX7415; fCLK= 100kHz; SHDN= VDD; VCOM= VOS= VDD/ 2; = +25°C; unless otherwise noted.)
