MAX295:8th-Order, Lowpass, Switched-Capacitor Filters

Also See MAX7401/5 8th-Order, Low-Power Bessel Filters

The MAX291/MAX292/MAX295/MAX296 are easy-to-use, 8th-order, lowpass, switched-capacitor filters that can be set up with corner frequencies from 0.1Hz to 25kHz (MAX291/MAX292) or 0.1Hz to 50kHz (MAX295/MAX296). The MAX291/MAX295 Butterworth filters provide maximally flat passband response, and the MAX292/MAX296 Bessel filters provide low overshoot and fast settling. All four filters have fixed responses, so the design task is limited to selecting the clock frequency that controls the filter's corner frequency. An external capacitor is used to generate a clock using the internal oscillator, or an external clock signal can be used. An uncommitted operational amplifier (noninverting input grounded) is provided for building a continuous time lowpass filter for post-filtering or anti-aliasing. Produced in an 8-pin DIP/SO and a 16-pin wide SO package, and requiring a minimum of external components, the MAX291 series delivers very aggressive performance from a tiny area.

Key Features
  • 8th-Order Lowpass Filters:
    • Butterworth (MAX291/MAX295)
    • Bessel (MAX292/MAX296)
  • Clock-Tunable Corner-Frequency Range:
    • 0.1Hz to 25kHz (MAX291/MAX292)
    • 0.1Hz to 50kHz (MAX295/MAX296)
  • No External Resistors or Capacitors Required
  • Internal or External Clock
  • Clock to Corner Frequency Ratio:
    • 100:1 (MAX291/MAX292)
    • 50:1 (MAX295/MAX296)
  • Low Noise: -70dB THD + Noise (Typ)
  • Operate with a Single +5V Supply or Dual ±5V Supplies
  • Uncommitted Op Amp for Anti-Aliasing or Clock-Noise Filtering
  • 8-Pin DIP and SO Packages
MAX291, MAX292, MAX295, MAX296: Typical Operating Circuit
MAX291, MAX292, MAX295, MAX296: Typical Operating Circuit
Applications/Uses
  • 50Hz/60Hz Line-Noise Filtering
  • ADC Anti-Aliasing Filter
  • DAC Post-Filtering
  • Noise Analysis
DataSheet
titleDownload file
MAX291-MAX296 Data SheetMAX291-MAX296.pdf
Parametrics
Part NumberFilter SectionsOrder Per Filter SectionFilter ClassFilter TypeFilter CharacteristicProgram MethodLowest Cutoff
(Hz)
Highest Cutoff
(kHz)
VSUPPLY (Dual)
(±V)
VSUPPLY
(V)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
maxminDualSee Notes
MAX29118Switched CapLowpassButterworthClock0.12555-55 to +125
-40 to +85
0 to +70
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
SOIC(W)/16
$4.88 @1k
MAX292Bessel25CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
SOIC(W)/16
$4.20 @1k
MAX295Butterworth50CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
SOIC(W)/16
$3.92 @1k
MAX296Bessel50CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
SOIC(W)/16
$3.74 @1k
Quality and Environmental Data
Related Products
  • MAX7405:8th-Order, Lowpass, Bessel, Switched-Capacitor Filters
  • MAX7401:8th-Order, Lowpass, Bessel, Switched-Capacitor Filters
  • MAX7413:5th-Order, Lowpass, Switched-Capacitor Filters
  • MAX7410:5th-Order, Lowpass, Switched-Capacitor Filters
  • MAX7414:5th-Order, Lowpass, Switched-Capacitor Filters
  • MAX7409:5th-Order, Lowpass, Switched-Capacitor Filters
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX295C/DNRNDMAX295ESA+DICE SALES,;NA pin;DICE S;0°C to +70°CSee data sheet
MAX295CPANo Longer AvailableMAX295CPA+PDIP(N),;8 pin;79.7 mm²0°C to +70°CNo
MAX295CPA+ActivePDIP(N),;8 pin;79.7 mm²0°C to +70°CLead Free
MAX295CSANo Longer AvailableMAX295CSA+SOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
MAX295CSA+ActiveSOIC(N),;8 pin;30.9 mm²0°C to +70°CLead Free
MAX295CSA+TActiveN.SO;8 pin0°C to +70°CSee data sheet
MAX295CSA-TNo Longer AvailableMAX295CSA+TN.SO;8 pin0°C to +70°CSee data sheet
MAX295CWENo Longer AvailableMAX295CWE+SOIC(W),;16 pin;111.8 mm²0°C to +70°CNo
MAX295CWE+ActiveSOIC(W),;16 pin;111.8 mm²0°C to +70°CLead Free
MAX295CWE+TActiveSOIC(W),;16 pin;111.8 mm²0°C to +70°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX295CWE-TNo Longer AvailableMAX295CWE+TW.SO;16 pin0°C to +70°CSee data sheet
MAX295EPANo Longer AvailableMAX295EPA+PDIP(N),;8 pin;79.7 mm²-40°C to +85°CNo
MAX295EPA+ActivePDIP(N),;8 pin;79.7 mm²-40°C to +85°CLead Free
MAX295ESANo Longer AvailableMAX295ESA+SOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
MAX295ESA+ActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX295ESA+TActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX295ESA-TNo Longer AvailableMAX295ESA+TN.SO;8 pin-40°C to +85°CSee data sheet
MAX295EWENo Longer AvailableMAX295EWE+SOIC(W),;16 pin;111.8 mm²-40°C to +85°CNo
MAX295EWE+ActiveSOIC(W),;16 pin;111.8 mm²-40°C to +85°CLead Free
MAX295EWE+TActiveSOIC(W),;16 pin;111.8 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX295EWE-TNo Longer AvailableMAX295EWE+TW.SO;16 pin-40°C to +85°CSee data sheet
MAX295EWE/GH9No Longer AvailableMAX295EWE+SOIC(W),;16 pin;111.8 mm²-40°C to +85°CNo
MAX295EWE/GH9-TNo Longer AvailableMAX295EWE+SOIC(W),;16 pin;111.8 mm²-40°C to +85°CNo
MAX295MJAActiveCDIP(N),;8 pin;82.6 mm²-55°C to +125°CNo
MAX291-MAX296.pdf MAX296
MAX295.pdf MAX295
MAX291-MAX296.pdf MAX296