MAX297：8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
Also See MAX7400/3/4/7 for Lowest-Power Applications
The MAX293/MAX294/MAX297 are easy-to-use, 8th-order, lowpass, elliptic, switched-capacitor filters that can be set up with corner frequencies from 0.1Hz to 25kHz (MAX293/MAX294) or from 0.1Hz to 50kHz (MAX297). The MAX293/MAX297's 1.5 transition ratio provides sharp rolloff and -80dB of stopband rejection. The MAX294's 1.2 transition ratio provides the steepest rolloff and -58dB of stopband rejection. All three 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 op amp (noninverting input grounded) is provided for building a continuous-time lowpass filter for post-filtering or anti-aliasing. Steep rolloff and high order make these filters ideal for anti-aliasing applications that require maximum bandwidth, and for communication applications that require filtering signals in close proximity within the frequency domain. The MAX293/MAX294/MAX297 are available in 8-pin DIP and 16-pin wide SO packages, delivering aggressive performance from a tiny area.
Key Features
| MAX293, MAX294, MAX297: Typical Operating Circuit Applications/Uses
|
DataSheet
| title | Download file |
|---|---|
| MAX293-MAX297 Data Sheet | MAX293-MAX297.pdf |
Parametrics
| Part Number | Filter Sections | Order Per Filter Section | Filter Class | Filter Type | Filter Characteristic | Program Method | Lowest Cutoff (Hz) | Highest Cutoff (kHz) | VSUPPLY (Dual) (±V) | VSUPPLY (V) | Oper. Temp. (°C) | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| max | min | Dual | See Notes | ||||||||||
| MAX293 | 1 | 8 | Switched Cap | Lowpass | Elliptic | Clock | 0.1 | 25 | 5 | 5 | -55 to +125 -40 to +85 0 to +70 | CDIP(N)/8 PDIP(N)/8 SOIC(N)/8 SOIC(W)/16 | $4.73 @1k |
| MAX294 | 25 | CDIP(N)/8 PDIP(N)/8 SOIC(N)/8 SOIC(W)/16 | $5.17 @1k | ||||||||||
| MAX297 | 50 | CDIP(N)/8 PDIP(N)/8 SOIC(N)/8 SOIC(W)/16 | $4.68 @1k | ||||||||||
Quality and Environmental Data
Related Products
- MAX7408：5th Order, Lowpass, Elliptic, Switched-Capacitor Filters
- MAX7407：8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
- MAX7400：8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
- MAX7403：8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
- MAX7404：8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
|---|---|---|---|---|---|
| MAX297C/D | No Longer Available | MAX297ESA+ | DICE SALES,;NA pin;DICE; | 0°C to +70°C | See data sheet |
| MAX297CPA | No Longer Available | MAX297CPA+ | PDIP(N),;8 pin;79.7 mm² | 0°C to +70°C | No |
| MAX297CPA+ | Active | PDIP(N),;8 pin;79.7 mm² | 0°C to +70°C | Lead Free | |
| MAX297CSA | No Longer Available | MAX297CSA+ | SOIC(N),;8 pin;30.9 mm² | 0°C to +70°C | No |
| MAX297CSA+ | Active | SOIC(N),;8 pin;30.9 mm² | 0°C to +70°C | Lead Free | |
| MAX297CSA+T | Active | N.SO;8 pin | 0°C to +70°C | See data sheet | |
| MAX297CSA-T | No Longer Available | MAX297CSA+T | N.SO;8 pin | 0°C to +70°C | See data sheet |
| MAX297CWE | No Longer Available | MAX297CWE+ | SOIC(W),;16 pin;111.8 mm² | 0°C to +70°C | No |
| MAX297CWE+ | Active | SOIC(W),;16 pin;111.8 mm² | 0°C to +70°C | Lead Free | |
| MAX297CWE+T | Active | SOIC(W),;16 pin;111.8 mm² | 0°C to +70°C | Lead Free | |
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
| MAX297CWE-T | No Longer Available | MAX297CWE+T | W.SO;16 pin | 0°C to +70°C | See data sheet |
| MAX297EPA | No Longer Available | MAX297EPA+ | PDIP(N),;8 pin;79.7 mm² | -40°C to +85°C | No |
| MAX297EPA+ | Active | PDIP(N),;8 pin;79.7 mm² | -40°C to +85°C | Lead Free | |
| MAX297ESA | No Longer Available | MAX297ESA+ | SOIC(N),;8 pin;30.9 mm² | -40°C to +85°C | No |
| MAX297ESA+ | Active | SOIC(N),;8 pin;30.9 mm² | -40°C to +85°C | Lead Free | |
| MAX297ESA+T | Active | SOIC(N),;8 pin;30.9 mm² | -40°C to +85°C | Lead Free | |
| MAX297ESA-T | No Longer Available | MAX297ESA+T | N.SO;8 pin | -40°C to +85°C | See data sheet |
| MAX297EWE | No Longer Available | MAX297EWE+ | SOIC(W),;16 pin;111.8 mm² | -40°C to +85°C | No |
| MAX297EWE+ | Active | SOIC(W),;16 pin;111.8 mm² | -40°C to +85°C | Lead Free | |
| MAX297EWE+T | Active | SOIC(W),;16 pin;111.8 mm² | -40°C to +85°C | Lead Free | |
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
| MAX297EWE-T | No Longer Available | MAX297EWE+T | SOIC(W),;16 pin;111.8 mm² | -40°C to +85°C | No |
| MAX297MJA | Active | CDIP(N),;8 pin;82.6 mm² | -55°C to +125°C | No |
- MAX293-MAX297.pdf MAX297
