MAX268:Pin-Programmable Universal and Bandpass Filters

The MAX263/264 and MAX267/268 CMOS switched-capacitor active filters are designed for precision filtering applications. Center frequency, Q, and operating mode are all selected via pin-strapped inputs. The MAX263/264 uses no external components for a variety of bandpass, lowpass, highpass, notch and allpass filters. The MAX267/268 is dedicated to bandpass applications and includes an uncommitted op-amp. Two second-order filter sections are included in both devices. An input clock and a 5-bit programming input precisely set the filter center/corner frequency. Q is also programmed from 0.5 to 64. Separate clock inputs for each filter half operate either an external clock or a crystal. The MAX263 and 267 operate with center frequencies up to 57kHz while the MAX264 and 268 extend the f0 range to 140kHz by employing lower fCLK/f0 ratios. The MAX263/264 is supplied in 28 pin wide DIP and small outline packages while the MAX267/268 is supplied in 24 pin narrow DIP and wide SO packages. All devices are available in commercial, extended, and military temperature ranges.

Key Features
  • 32-Step Center Frequency Control
  • 128-Step Q Control
  • Independent Q and f0 Programming
  • Guaranteed Clock to f0 Ratio—1% (A grade)
  • 75kHz f0 Range (MAX264/268)
  • Single +5V and ±5V Operation
MAX263, MAX264, MAX267, MAX268: Typical Application Circuit
MAX263, MAX264, MAX267, MAX268: Typical Application Circuit
DataSheet
titleDownload file
MAX263-MAX268 Data SheetMAX263-MAX268.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
MAX26322Switched CapUniversalProgrammablePin Strap0.45755-55 to +125
-40 to +85
0 to +70
CDIP(W)/28
PDIP(W)/28
SOIC(W)/28
$14.48 @1k
MAX264Universal11402.37 to 6.3CDIP(W)/28
PDIP(W)/28
SOIC(W)/28
$10.09 @500
MAX267Bandpass0.4575CDIP(N)/24
PDIP(N)/24
SOIC(W)/24
$8.63 @1k
MAX268Bandpass11405CDIP(N)/24
PDIP(N)/24
SOIC(W)/24
$10.36 @500
Quality and Environmental Data
Related Products
  • MAX262:Microprocessor Programmable Universal Active Filters
  • MAX260:Microprocessor Programmable Universal Active Filters
  • MAX261:Microprocessor Programmable Universal Active Filters
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX268ACNGNo Longer AvailableMAX268ACNG+PDIP(N),;24 pin;158.4 mm²0°C to +70°CNo
MAX268ACNG+ActivePDIP(N),;24 pin;158.4 mm²0°C to +70°CLead Free
MAX268ACWGNo Longer AvailableMAX268ACWG+SOIC(W),;24 pin;166.1 mm²0°C to +70°CNo
MAX268ACWG+ActiveSOIC(W),;24 pin;166.1 mm²0°C to +70°CLead Free
MAX268ACWG+TActiveSOIC(W),;24 pin;166.1 mm²0°C to +70°CLead Free
MAX268ACWG-TNo Longer AvailableMAX268ACWG+TW.SO;24 pin0°C to +70°CSee data sheet
MAX268AENGNo Longer AvailableMAX268AENG+PDIP(N),;24 pin;158.4 mm²-40°C to +85°CNo
MAX268AENG+ActivePDIP(N),;24 pin;158.4 mm²-40°C to +85°CLead Free
MAX268AEWGNo Longer AvailableMAX268AEWG+SOIC(W),;24 pin;166.1 mm²-40°C to +85°CNo
MAX268AEWG+ActiveSOIC(W),;24 pin;166.1 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX268AEWG+TActiveSOIC(W),;24 pin;166.1 mm²-40°C to +85°CLead Free
MAX268AEWG-TNo Longer AvailableMAX268AEWG+TW.SO;24 pin-40°C to +85°CSee data sheet
MAX268AMRGNo Longer AvailableCDIP(N),;24 pin;264.3 mm²-55°C to +125°CNo
MAX268BCNGNo Longer AvailableMAX268BCNG+PDIP(N),;24 pin;158.4 mm²0°C to +70°CNo
MAX268BCNG+ActivePDIP(N),;24 pin;158.4 mm²0°C to +70°CLead Free
MAX268BCWGNo Longer AvailableMAX268BCWG+SOIC(W),;24 pin;166.1 mm²0°C to +70°CNo
MAX268BCWG+ActiveSOIC(W),;24 pin;166.1 mm²0°C to +70°CLead Free
MAX268BCWG+TActiveSOIC(W),;24 pin;166.1 mm²0°C to +70°CLead Free
MAX268BCWG-TNo Longer AvailableMAX268BCWG+TW.SO;24 pin0°C to +70°CSee data sheet
MAX268BENGNo Longer AvailableMAX268BENG+PDIP(N),;24 pin;158.4 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX268BENG+ActivePDIP(N),;24 pin;158.4 mm²-40°C to +85°CLead Free
MAX268BEWGNo Longer AvailableMAX268BEWG+SOIC(W),;24 pin;166.1 mm²-40°C to +85°CNo
MAX268BEWG+ActiveSOIC(W),;24 pin;166.1 mm²-40°C to +85°CLead Free
MAX268BEWG+TActiveSOIC(W),;24 pin;166.1 mm²-40°C to +85°CLead Free
MAX268BEWG-TNo Longer AvailableMAX268BEWG+TW.SO;24 pin-40°C to +85°CSee data sheet
MAX268BMRGNo Longer AvailableCDIP(N),;24 pin;264.3 mm²-55°C to +125°CNo
MAX263-MAX268.pdf MAX268
MAX268.pdf MAX268
MAX263-MAX268.pdf MAX268