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MAX7491

更新时间： 2024-11-28 14:57:19
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亚德诺 - ADI 开关通用开关
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18页 355K
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双路、通用开关电容滤波器

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MAX7491 数据手册

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19-1768; Rev 1; 4/09  
Dual Universal Switched-Capacitor Filters  
0/MAX7491  
General Description  
Features  
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 func-  
tions: bandpass, lowpass, highpass, and notch (band  
reject). Three of these functions are simultaneously  
available. Fourth-order filters can be obtained by cas-  
cading the two 2nd-order filter sections. Similarly, high-  
er order filters can easily be created by cascading  
multiple MAX7490/MAX7491s.  
o Dual 2nd-Order Filter in a 16-Pin QSOP Package  
o High Accuracy  
Q Accuracy: 0.2%  
Clock-to-Center Frequency Error: 0.2%  
o Rail-to-Rail Input and Output Operation  
o Single-Supply Operation: +5V (MAX7490)  
or +3V (MAX7491)  
o Internal or External Clock  
o Highpass, Lowpass, Bandpass, and Notch Filters  
o Clock-to-Center Frequency Ratio of 100:1  
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.  
o Internal Sampling-to-Center Frequency Ratio  
of 200:1  
o Center Frequency up to 40kHz  
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.  
o Easily Cascaded for Multipole Filters  
o Low-Power Shutdown: < 1µA Supply Current  
Ordering Information  
SUPPLY  
VOLTAGE  
(+V)  
________________________Applications  
PIN-  
PACKAGE  
PART  
TEMP RANGE  
Tunable Active Filters  
Multipole Filters  
MAX7490CEE+  
MAX7490EEE+  
MAX7491CEE+  
MAX7491EEE+  
0°C to +70°C 16 QSOP  
-40°C to +85°C 16 QSOP  
0°C to +70°C 16 QSOP  
-40°C to +85°C 16 QSOP  
5
5
3
3
ADC Anti-Aliasing  
Post-DAC Filtering  
Adaptive Filtering  
Phase-Locked Loops (PLLs)  
Set-Top Boxes  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
Pin Configuration  
TOP VIEW  
+
LPA  
BPA  
1
2
3
4
5
6
7
8
16 LPB  
15 BPB  
NA/HPA  
INVA  
14 NB/HPB  
Typical Application Circuit appears at end of data sheet.  
MAX7490  
MAX7491  
13 INVB  
12 SB  
SA  
SHDN  
GND  
11 COM  
10 EXTCLK  
V
9
CLK  
DD  
QSOP  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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