MAX291/MAX292/ MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters General Description Features 8th-Order Lowpass Filters: The MAX291/MAX292/MAX295/MAX296 are easy-to-use, 8th-order, lowpass, switched-capacitor filters that can be Butterworth (MAX291/MAX295) set up with corner frequencies from 0.1Hz to 25kHz Bessel (MAX292/MAX296) (MAX291/MAX292) or 0.1Hz to 50kHz (MAX295/MAX296). Clock-Tunable Corner-Frequency Range: 0.1Hz to 25kHz (MAX291/MAX292) The MAX291/MAX295 Butterworth filters provide maxi- mally flat passband response, and the MAX292/MAX296 0.1Hz to 50kHz (MAX295/MAX296) Bessel filters provide low overshoot and fast settling. All No External Resistors or Capacitors Required four filters have fixed responses, so the design task is Internal or External Clock limited to selecting the clock frequency that controls the Clock to Corner Frequency Ratio: filters corner frequency. 100:1 (MAX291/MAX292) An external capacitor is used to generate a clock using 50:1 (MAX295/MAX296) the internal oscillator, or an external clock signal can be Low Noise: -70dB THD + Noise (Typ) used. An uncommitted operational amplifier (noninverting input grounded) is provided for building a continuous- Operate with a Single +5V Supply or time lowpass filter for post-filtering or anti-aliasing. Dual 5V Supplies Produced in an 8-pin DIP/SO and a 16-pin wide SO Uncommitted Op Amp for Anti-Aliasing or Clock- package, and requiring a minimum of external compo- Noise Filtering nents, the MAX291 series delivers very aggressive per- 8-Pin DIP and SO Packages formance from a tiny area. Applications Ordering Information ADC Anti-Aliasing Filter PART TEMP. RANGE PIN-PACKAGE MAX291CPA 0C to +70C 8 Plastic DIP Noise Analysis MAX291CSA 0C to +70C 8 SO DAC Post-Filtering MAX291CWE 0C to +70C 16 Wide SO 50Hz/60Hz Line-Noise Filtering MAX291C/D 0C to +70C Dice* MAX291EPA -40C to +85C 8 Plastic DIP Functional Diagrams MAX291ESA -40C to +85C 8 SO MAX291EWE -40C to +85C 16 Wide SO MAX291MJA -55C to +125C 8 CERDIP** Ordering Information continued at end of data sheet. Typical Operating Circuit * Contact factory for dice specifications. ** Contact factory for availability and processing to MIL-STD-883. +5V Pin Configurations 7 V+ 8 TOP VIEW 5 INPUT IN OUT OUTPUT 3 OP OUT 1 8 CLK IN MAX29 2 7 V+ V- 1 MAX29 4 CLOCK CLK OP IN- 3 6 GND 6 OP OUT V- 2 OP IN- 4 5 OUT Pin Configurations appear at end of data sheet. -5V Functional Diagrams continued at end of data sheet. DIP/SO UCSP is a trademark of Maxim Integrated Products, Inc. Pin Configuration is 8-pin DIP/SO. 16-pin Wide SO at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim integrated.com. 19-4526 Rev 5 5/10 AVAILABLEMAX291/MAX292/MAX295/MAX296 8th-Order, Lowpass, Switched-Capacitor Filters ABSOLUTE MAXIMUM RATINGS Supply Voltage (V+ to V-).......................................................12V Operating Temperature Ranges Input Voltage at Any Pin.............V- + (-0.3V) V V+ + (0.3V) MAX29 C ........................................................0C to +70C IN Continuous Power Dissipation MAX29 E .....................................................-40C to +85C 8-Pin Plastic DIP (derate 9.09mW/C above +70C) ...727mW MAX29 MJA ..................................................-55C to +125C 8-Pin SO (derate 5.88mW/C above +70C)................471mW Storage Temperature Range .............................-65C to +160C 16-Pin Wide SO (derate 9.52mW/C above +70C) ....762mW Lead Temperature (soldering, 10s) .................................+300C 8-Pin CERDIP (derate 8.00mW/C above +70C)........640mW Soldering Temperature (reflow) .......................................+240C 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 CHARACTERISTICS (V+ = 5V, V- = -5V, filter output measured at OUT pin, 20k load resistor to ground at OUT and OP OUT, f = 100kHz CLK (MAX291/MAX292) or f = 50kHz (MAX295/MAX296), T = T to T , unless otherwise noted.) CLK A MIN MAX PARAMETER CONDITIONS MIN TYP MAX UNITS FILTER CHARACTERISTICS MAX291/MAX292 0.1-25k Corner-Frequency Range Hz MAX295/MAX296 0.1-50k MAX291/MAX292 100:1 Clock to Corner Frequency Ratio MAX295/MAX296 50:1 MAX291 10 MAX292 40 Clock to Corner ppm/C Frequency Tempco MAX295 5 MAX296 60 f = 0.50 F -0.02 -0.1 IN o f = 1.00 F -2.2 -2.7 -3.2 IN o MAX291 f = 2.00 F -43.0 -48.0 IN o f = 3.00 F -70.0 -76.0 IN o f = 0.25 F -0.1 -0.2 -0.3 IN o f = 0.50 F -0.6 -0.8 -1.0 IN o f = 1.00 F -2.7 -3.0 -3.3 IN o MAX292 f = 2.00 F -11.0 -13.0 -15.0 IN o f = 3.00 F -30.0 -34.0 IN o f = 4.00 F -47.0 -51.0 IN o f = 6.00 F -74.0 -78.0 Insertion Gain Relative to IN o dB DC Gain f = 0.50 F -0.02 -0.1 IN o f = 1.00 F -2.2 -2.7 -3.2 IN o MAX295 f = 2.00 F -43.0 -48.0 IN o f = 3.00 F -70.0 -76.0 IN o f = 0.25 F -0.1 -0.2 -0.3 IN o f = 0.50 F -0.6 -0.8 -1.0 IN o f = 1.00 F -2.7 -3.0 -3.3 IN o MAX296 f = 2.00 F -11.0 -13.0 -15.0 IN o f = 3.00 F -30.0 -34.0 IN o f = 4.00 F -47.0 -51.0 IN o f = 6.00 F -74.0 -78.0 IN o 2 Maxim Integrated