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MAX7490, MAX7491
Dual Universal Switched-Capacitor Filters
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Status
Active: In Production.
Description
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.
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Data Sheet
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Key Features
- 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
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Applications/Uses
- Adaptive Filters
- ADC Anti-Aliasing
- Multipole Filters
- Phase-Locked Loops (PLLs)
- Post-DAC Filtering
- Set-Top Boxes
- Tunable Active Filters
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Key Specifications:
| Active Filters |
| Part Number |
Filter Sections |
Order Per Filter Section |
Filter Class |
Filter Type |
Filter Characteristic |
Program Method |
Lowest Cutoff
(Hz) |
Highest Cutoff
(kHz) |
VSUPPLY
(V) |
Oper. Temp.
(°C) |
Budgetary Price |
| max |
min |
See Notes |
| MAX7490 |
2 |
2 |
Switched Cap |
Universal |
Programmable |
Clock |
1 |
40 |
5 |
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$2.94 @1k |
| MAX7491 |
3 |
$2.94 @1k |
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See All Active Filters (50)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Application Circuit
Application Notes
Reliability Reports
| Show FIT data for: |
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| Request Reliability Report for: |
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Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX7490CEE
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-4*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX7490CEE+
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+4*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX7490CEE+T
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+4*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX7490CEE-T
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Active |
QSOP;16 pin
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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| MAX7490EEE
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX7490EEE+
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX7490EEE+T
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX7490EEE-T
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Active |
QSOP;16 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX7491CEE
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-4*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX7491CEE+
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+4*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX7491CEE+T
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Active |
QSOP;16 pin
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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| MAX7491CEE-T
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Active |
QSOP;16 pin
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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| MAX7491EEE
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX7491EEE+
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX7491EEE+T
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX7491EEE-T
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Active |
QSOP;16 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-1768
Rev 1;
2009-06-09
This page last modified: 2009-10-16
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