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MAX7400CSAMAXIMN/a3850avai8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
MAX7400ESAMAXIMN/a2500avai8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters


MAX7400CSA ,8th-Order, Lowpass, Elliptic, Switched-Capacitor Filtersapplications. They fea-' Single-Supply Operationture a shutdown mode that reduces the supply curren ..
MAX7400ESA ,8th-Order, Lowpass, Elliptic, Switched-Capacitor FiltersELECTRICAL CHARACTERISTICS—MAX7400/MAX7403(V = +5V, filter output measured at OUT, 10kΩ || 50pF loa ..
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MAX7400CSA-MAX7400ESA
8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
General Description
The MAX7400/MAX7403/MAX7404/MAX7407 8th-order,
lowpass, elliptic, switched-capacitor filters (SCFs) oper-
ate from a single +5V (MAX7400/MAX7403) or +3V
(MAX7404/MAX7407) supply. These devices draw 2mA
of supply current and allow corner frequencies from
1Hz to 10kHz, making them ideal for low-power anti-
aliasing and post-DAC filtering applications. They fea-
ture a shutdown mode that reduces the 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. In addition,
an offset adjustment pin (OS) allows for the adjustment
of the DC output level.
The MAX7400/MAX7404 provide 82dB of stopband
rejection and a sharp rolloff with a transition ratio of 1.5.
The MAX7403/MAX7407 provide a sharper rolloff with a
transition ratio of 1.2, while still delivering 60dB of stop-
band rejection. The fixed response of these devices
simplifies the design task to corner-frequency selection
by setting a clock frequency. The MAX7400/
MAX7403/MAX7404/MAX7407 are available in 8-pin SO
and DIP packages.
Applications

ADC Anti-AliasingSpeech Processing
Post-DAC FilteringAir-Bag Electronics
CT2 Base Stations
Features
8th-Order Lowpass Elliptic FilterLow Noise and Distortion
-82dB THD + Noise (MAX7400)
Clock-Tunable Corner Frequency (1Hz to 10kHz)100:1 Clock-to-Corner RatioSingle-Supply Operation
+5V (MAX7400/MAX7403)
+3V (MAX7404/MAX7407)
Low Power
2mA (Operating Mode)
0.2µA (Shutdown Mode)
Available in 8-Pin SO and DIP PackagesLow Output Offset: ±5mV
MAX7400/MAX7403/MAX7404/MAX7407
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
Typical Operating Circuit

19-4764; Rev 2; 6/99
Pin Configuration
Ordering Information
MAX7400/MAX7403/MAX7404/MAX7407
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—MAX7400/MAX7403

(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 +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
MAX7400/MAX7403..............................................-0.3V to +6V
MAX7404/MAX7407..............................................-0.3V to +4V
IN, OUT, COM, OS, CLK............................-0.3V to (VDD+ 0.3V)SHDN........................................................................-0.3V to +6V
OUT Short-Circuit Duration...................................................1sec
Continuous Power Dissipation (TA= +70°C)
SO (derate 5.88mW/°C above +70°C)..........................471mW
DIP (derate 9.1mW/°C above +70°C)...........................727mW
Operating Temperature Ranges
MAX740_C_A .....................................................0°C to +70°C
MAX740_E_A ..................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX7400/MAX7403/MAX7404/MAX7407
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
ELECTRICAL CHARACTERISTICS—MAX7400/MAX7403 (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—MAX7404/MAX7407

(VDD= +3V, 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.)
MAX7400/MAX7403/MAX7404/MAX7407
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
ELECTRICAL CHARACTERISTICS—MAX7404/MAX7407 (continued)

(VDD= +3V, 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.)
ELLIPTIC (r=1.5) FILTER CHARACTERISTICS—MAX7400/MAX7404

(VDD= +5V for MAX7400, VDD= +3V for MAX7404; 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.)
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filters
Note 1:
The maximum fCis defined as the clock frequency, fCLK= 100 ·fC, at which the peak SINAD drops to 68dB with a
sinusoidal input at 0.2fC.
Note 2:
DC insertion gain is defined as DVOUT/ DVIN.
Note 3:
OS voltages above VDD- 1V saturate the input and result in a 75µA typical input leakage current.
Note 4:
For MAX7400/MAX7403, fOSC(kHz) @38 ·103 / COSC(pF). For MAX7404/MAX7407, fOSC(kHz) @34 ·103 / COSC(pF).
Note 5:
The input frequencies, fIN, are selected at the peaks and troughs of the frequency responses.
ELLIPTIC (r=1.2) FILTER CHARACTERISTICS—MAX7403/MAX7407

(VDD= +5V for MAX7403, VDD= +3V for MAX7407; 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.)
Typical Operating Characteristics

(VDD= +5V for MAX7400/MAX7403, VDD= +3V for MAX7404/MAX7407; VCOM= VOS= VDD/ 2; SHDN= VDD; fCLK= 100kHz; = +25°C; unless otherwise noted.)
MAX7400/MAX7403/MAX7404/MAX7407
MAX7400/MAX7403/MAX7404/MAX7407
8th-Order, Lowpass, Elliptic,
Switched-Capacitor Filtersypical Operating Characteristics (continued)

(VDD= +5V for MAX7400/MAX7403, VDD= +3V for MAX7404/MAX7407; VCOM= VOS= VDD/ 2; SHDN= VDD; fCLK= 100kHz; = +25°C; unless otherwise noted.)
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