MAX7490 Maxim, MAX7490 Datasheet
MAX7490
Manufacturer Part Number
MAX7490
Description
Dual Universal Switched-Capacitor Filters
Manufacturer
Maxim
Datasheet
1.MAX7490.pdf
(18 pages)
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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.
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.
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
19-1768; Rev 0; 7/00
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________Applications
Typical Application Circuit appears at end of data sheet.
Tunable Active Filters
Multipole Filters
ADC Anti-Aliasing
Post-DAC Filtering
Adaptive Filtering
Phase-Locked Loops (PLLs)
Set-Top Boxes
Dual Universal Switched-Capacitor Filters
________________________________________________________________ Maxim Integrated Products
General Description
®
,
o Dual 2nd-Order Filter in a 16-Pin QSOP Package
o High Accuracy
o Rail-to-Rail Input and Output Operation
o Single-Supply Operation: +5V (MAX7490)
o Internal or External Clock
o Highpass, Lowpass, Bandpass, and Notch Filters
o Clock-to-Center Frequency Ratio of 100:1
o Internal Sampling-to-Center Frequency Ratio
o Center Frequency up to 40kHz
o Easily Cascaded for Multipole Filters
o Low-Power Shutdown: <1µA Supply Current
or +3V (MAX7491)
of 200:1
MAX7490CEE
MAX7491CEE
MAX7490EEE
MAX7491EEE
Q Accuracy: ±0.2%
Clock-to-Center Frequency Error: ±0.2%
TOP VIEW
PART
NA/HPA
SHDN
INVA
GND
BPA
LPA
V
SA
DD
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
1
2
3
4
5
6
7
8
Ordering Information
MAX7490
MAX7491
QSOP
Pin Configuration
PIN-
PACKAGE
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16
15
14
13
12
11
10
9
LPB
BPB
NB/HPB
INVB
SB
COM
EXTCLK
CLK
Features
VOLTAGE
SUPPLY
(+V)
5
5
3
3
1
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