MAX7491
PRODUCTIONDual Universal Switched-Capacitor Filters
- Part Models
- 3
- 1ku List Price
- Starting From $3.58
Part Details
- Dual 2nd-Order Filter in a 16-Pin QSOP Package
- High Accuracy
- Q Accuracy: ±0.2%
- Clock-to-Center Frequency Error: ±0.2%
- Rail-to-Rail Input and Output Operation
- Single-Supply Operation: +5V (MAX7490) or +3V (MAX7491)
- Internal or External Clock
- Highpass, Lowpass, Bandpass, and Notch Filters
- Clock-to-Center Frequency Ratio of 100:1
- Internal Sampling-to-Center Frequency Ratio of 200:1
- Center Frequency up to 40kHz
- Easily Cascaded for Multipole Filters
- Low-Power Shutdown: < 1µA Supply Current
The MAX7490/MAX7491 consist of two identical low-power, low-voltage, wide dynamic range, rail-to-rail, 2nd-order switched-capacitor building blocks. Each of the two filter sections, together with two to four external resistors, can generate all standard 2nd-order functions: bandpass, lowpass, highpass, and notch (band reject). Three of these functions are simultaneously available. Fourth-order filters can be obtained by cascading the two 2nd-order filter sections. Similarly, higher order filters can easily be created by cascading multiple MAX7490/MAX7491s.
Two clocking options are available: self-clocking (through the use of an external capacitor) or external clocking for tighter cutoff frequency control. The clock-to-center frequency ratio is 100:1. Sampling is done at twice the clock frequency, further separating the cutoff frequency and Nyquist frequency.
The MAX7490/MAX7491 have an internal rail splitter that establishes a precise common voltage needed for single-supply operation. The MAX7490 operates from a single +5V supply and the MAX7491 operates from a single +3V supply. Both devices feature a low-power shutdown mode and come in a 16-pin QSOP package.
Applications
- Adaptive Filters
- ADC Anti-Aliasing
- Multipole Filters
- Phase-Locked Loops (PLLs)
- Post-DAC Filtering
- Set-Top Boxes
- Tunable Active Filters
Documentation
Data Sheet 1
Technical Articles 3
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX7491CEE+ | 16-QSOP-150_MIL | ||
| MAX7491EEE+ | 16-QSOP-150_MIL | ||
| MAX7491EEE+T | 16-QSOP-150_MIL |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 24, 2019 - 1746N ASSEMBLY |
||
| MAX7491CEE+ | PRODUCTION | |
| MAX7491EEE+ | PRODUCTION | |
| MAX7491EEE+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Low-Pass Filters 8 | ||
| MAX7408 | PRODUCTION | 5th Order, Lowpass, Elliptic, Switched-Capacitor Filters |
| MAX7409 | PRODUCTION | 5th-Order, Lowpass, Switched-Capacitor Filters |
| MAX7410 | PRODUCTION | 5th-Order, Lowpass, Switched-Capacitor Filters |
| MAX7411 | PRODUCTION | 5th Order, Lowpass, Elliptic, Switched-Capacitor Filters |
| MAX7412 | PRODUCTION | 5th Order, Lowpass, Elliptic, Switched-Capacitor Filters |
| MAX7413 | PRODUCTION | 5th-Order, Lowpass, Switched-Capacitor Filters |
| MAX7414 | PRODUCTION | 5th-Order, Lowpass, Switched-Capacitor Filters |
| MAX7415 | PRODUCTION | 5th Order, Lowpass, Elliptic, Switched-Capacitor Filters |
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