MAX7400 Maxim Integrated Products, MAX7400 Datasheet
MAX7400
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MAX7400 Summary of contents
Page 1
... Rev 2; 6/99 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 0.2µ ...
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... Switched-Capacitor Filters ABSOLUTE MAXIMUM RATINGS V to GND DD MAX7400/MAX7403 ..............................................-0.3V to +6V MAX7404/MAX7407 ..............................................-0.3V to +4V IN, OUT, COM, OS, CLK ............................-0. SHDN........................................................................-0.3V to +6V OUT Short-Circuit Duration...................................................1sec 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 ...
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... ELECTRICAL CHARACTERISTICS—MAX7400/MAX7403 (continued) = +5V, filter output measured at OUT, 10kΩ || 50pF load to GND at OUT, SHDN = 100kHz unless otherwise noted. Typical values are at T CLK A MIN MAX PARAMETER SYMBOL POWER REQUIREMENTS Supply Voltage V Supply Current I Shutdown Current I SHDN Power-Supply Rejection Ratio PSRR ...
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... I DD Shutdown Current I SHDN Power-Supply Rejection Ratio PSRR SHUTDOWN SHDN Input High V SDH SHDN Input Low V SDL SHDN Input Leakage Current ELLIPTIC (r = 1.5) FILTER CHARACTERISTICS—MAX7400/MAX7404 (V = +5V for MAX7400 +3V for MAX7404; filter output measured at OUT; 10kΩ 100kHz; T COM OS DD CLK ...
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... C Note 2: DC insertion gain is defined as V Note 3: OS voltages above saturate the input and result in a 75µA typical input leakage current. DD Note 4: For MAX7400/MAX7403, f OSC Note 5: The input frequencies are selected at the peaks and troughs of the frequency responses +5V for MAX7400/MAX7403, V ...
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... Lowpass, Elliptic, Switched-Capacitor Filters (V = +5V for MAX7400/MAX7403 +25°C; unless otherwise noted.) A MAX7403/MAX7407 (r = 1.2) FREQUENCY RESPONSE 1kHz -20 -40 -60 -80 -100 -120 INPUT FREQUENCY (kHz) SUPPLY CURRENT vs. SUPPLY VOLTAGE 2.5 NO LOAD 2.4 2.3 2.2 MAX7400 MAX7404 2.1 MAX7403 MAX7407 2.0 1.9 1.8 1 ...
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... MAX7400/MAX7403 +25°C; unless otherwise noted.) A THD PLUS NOISE vs. INPUT SIGNAL AMPLITUDE (MAX7403 LOAD -10 (SEE TABLE A) -20 -30 -40 - -70 -80 - AMPLITUDE (Vp-p) THD PLUS NOISE vs. INPUT SIGNAL AMPLITUDE (MAX7404) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 0 0.5 1.0 1.5 AMPLITUDE (Vp-p) THD PLUS NOISE vs. INPUT SIGNAL ...
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... COM ride internal biasing, drive with an external supply Filter Input 3 GND Ground 4 V Positive Supply Input: +5V for MAX7400/MAX7403, +3V for MAX7404/MAX7407 DD 5 OUT Filter Output Offset Adjust Input. To adjust output offset, bias OS externally. Connect OS to COM if no offset adjustment needed. Refer to SHDN 7 Shutdown Input. Drive low to enable shutdown mode ...
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... The advantage of this approach is ease of design. However, this type of design is highly sensitive to component variations if any section’ high. The MAX7400 family uses an alter- native approach, which is to emulate a passive network using switched-capacitor integrators with summing and scaling. The passive network can be synthesized using CAD programs or can be found in many filter books ...
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... C OSC OSC C OSC where for the MAX7400/MAX7403, and for the MAX7404/MAX7407. Since the capacitor value is in picofarads, minimize the stray capacitance at CLK so that it does not affect the internal oscillator frequen- cy. Varying the rate of the internal oscillator adjusts the filter’s corner frequency by a 100:1 clock-to-corner fre- quency ratio ...
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... For single-supply or dual-supply operation, drive CLK and SHDN from GND (V- in dual-supply operation For a ±2.5V supply, use the MAX7400 or MAX7403; DD for a ±1.5V supply, use MAX7404 or MAX7407. For ±5V dual-supply applications, use the MAX291–MAX297. Input Signal Amplitude Range ...
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... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products PIN-PACKAGE ...