MAX7400/MAX7403/MAX7404/MAX7407 19-4764 Rev 2 6/99 8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters General Description Features The MAX7400/MAX7403/MAX7404/MAX7407 8th-order, 8th-Order Lowpass Elliptic Filter lowpass, elliptic, switched-capacitor filters (SCFs) oper- Low Noise and Distortion ate from a single +5V (MAX7400/MAX7403) or +3V -82dB THD + Noise (MAX7400) (MAX7404/MAX7407) supply. These devices draw 2mA Clock-Tunable Corner Frequency (1Hz to 10kHz) of supply current and allow corner frequencies from 1Hz to 10kHz, making them ideal for low-power anti- 100:1 Clock-to-Corner Ratio aliasing and post-DAC filtering applications. They fea- Single-Supply Operation ture a shutdown mode that reduces the supply current +5V (MAX7400/MAX7403) to 0.2A. +3V (MAX7404/MAX7407) Two clocking options are available: self-clocking Low Power (through the use of an external capacitor) or external 2mA (Operating Mode) clocking for tighter cutoff-frequency control. In addition, 0.2A (Shutdown Mode) an offset adjustment pin (OS) allows for the adjustment of the DC output level. Available in 8-Pin SO and DIP Packages The MAX7400/MAX7404 provide 82dB of stopband Low Output Offset: 5mV rejection and a sharp rolloff with a transition ratio of 1.5. The MAX7403/MAX7407 provide a sharper rolloff with a Ordering Information transition ratio of 1.2, while still delivering 60dB of stop- band rejection. The fixed response of these devices PART TEMP. RANGE PIN-PACKAGE simplifies the design task to corner-frequency selection MAX7400CSA 0C to +70C 8 SO by setting a clock frequency. The MAX7400/ MAX7400CPA 0C to +70C 8 Plastic DIP MAX7403/MAX7404/MAX7407 are available in 8-pin SO and DIP packages. MAX7400ESA -40C to +85C 8 SO MAX7400EPA -40C to +85C 8 Plastic DIP Applications Ordering Information continued at end of data sheet. ADC Anti-Aliasing Speech Processing Selector Guide Post-DAC Filtering Air-Bag Electronics OPERATING CT2 Base Stations PART FILTER RESPONSE VOLTAGE (V) MAX7400 Elliptic (r = 1.5) +5 MAX7403 Elliptic (r = 1.2) +5 Typical Operating Circuit MAX7404 Elliptic (r = 1.5) +3 MAX7407 Elliptic (r = 1.2) +3 V SUPPLY Pin Configuration 0.1F V DD SHDN TOP VIEW INPUT IN OUT OUTPUT COM 1 8 CLK MAX7400 IN 2 7 SHDN MAX7403 MAX7400 MAX7404 CLOCK CLK COM MAX7403 MAX7407 GND 3 6 OS MAX7404 OS 0.1F MAX7407 GND V 4 5 OUT DD SO/DIP Maxim Integrated Products 1 For free samples & the latest literature: 8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters ABSOLUTE MAXIMUM RATINGS V to GND Continuous Power Dissipation (T = +70C) DD A MAX7400/MAX7403 ..............................................-0.3V to +6V SO (derate 5.88mW/C above +70C)..........................471mW MAX7404/MAX7407 ..............................................-0.3V to +4V DIP (derate 9.1mW/C above +70C) ...........................727mW IN, OUT, COM, OS, CLK ............................-0.3V to (V + 0.3V) Operating Temperature Ranges DD SHDN........................................................................-0.3V to +6V MAX740 C A .....................................................0C to +70C OUT Short-Circuit Duration...................................................1sec MAX740 E A ..................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C 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. ELECTRICAL CHARACTERISTICSMAX7400/MAX7403 (V = +5V, filter output measured at OUT, 10k 50pF load to GND at OUT, SHDN = V , OS = COM, 0.1F from COM to GND, DD DD f = 100kHz, T = T to T , unless otherwise noted. Typical values are at +25C.) CLK A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS FILTER CHARACTERISTICS Corner Frequency f (Note 1) 0.001 to 10 kHz C Clock-to-Corner Ratio f /f 100:1 CLK C Clock-to-Corner Tempco 10 ppm/C Output Voltage Range 0.25 V - 0.25 V DD Output Offset Voltage V V = V = V / 2 5 25 mV OFFSET IN COM DD DC Insertion Gain with V = V / 2 (Note 2) -0.1 0.15 0.3 dB COM DD Output Offset Removed MAX7400 -82 Total Harmonic Distortion f = 200Hz, V = 4Vp-p, IN IN THD+N dB plus Noise measurement bandwidth = 22kHz MAX7403 -80 OS Voltage Gain to OUT A 1 V/V OS Input Voltage Range at OS V V 0.1 V OS COM V / 2 V / 2 DD DD Input, COM externally driven V / 2 DD - 0.5 + 0.5 COM Voltage Range V V COM V / 2 V / 2 DD DD Output, COM internally biased V / 2 DD - 0.2 + 0.2 Input Resistance at COM R 75 125 k COM Clock Feedthrough 10 mVp-p Resistive Output Load Drive R 10 1 k L Maximum Capacitive Load C 50 500 pF L at OUT Input Leakage Current at COM 0.1 10 A SHDN = GND, V = 0 to V COM DD Input Leakage Current at OS V = 0 to (V - 1V) (Note 3) 0.1 10 A OS DD CLOCK Internal Oscillator Frequency f C = 1000pF (Note 4) 29 38 48 kHz OSC OSC Clock Input Current I V = 0 or 5V 15 30 A CLK CLK Clock Input High V V - 0.5 V IH DD Clock Input Low V 0.5 V IL 2 MAX7400/MAX7403/MAX7404/MAX7407