MAX7480ESA Просмотр технического описания (PDF) - Maxim Integrated
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MAX7480ESA Datasheet PDF : 8 Pages
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8th-Order, Lowpass, Butterworth,
Switched-Capacitor Filter
Anti-Aliasing and Post-DAC Filtering
When using the MAX7480 for anti-aliasing or post-DAC
filtering, synchronize the DAC and the filter clocks. If
the clocks are not synchronized, beat frequencies may
alias into the passband.
The high clock-to-corner frequency ratio (100:1) also
eases the requirements of pre- and post-SCF filtering.
At the input, a lowpass filter prevents the aliasing of fre-
quencies around the clock frequency into the pass-
band. At the output, a lowpass filter attenuates the
clock feedthrough.
A high clock to corner-frequency ratio allows a simple
RC lowpass filter, with the cutoff frequency set above
the SCF corner frequency to provide input anti-aliasing
and reasonable output clock attenuation.
Harmonic Distortion
Harmonic distortion arises from nonlinearities within the
filter. These nonlinearities generate harmonics when a
pure sine wave is applied to the filter input. Table 1 lists
the MAX7480’s typical harmonic-distortion values with
a 10kΩ load at TA = +25°C.
V+ = +2.5V
INPUT IN
VDD
SHDN *
OUT OUTPUT
COM
MAX7480
V+
CLOCK CLK
OS
V-
0.1µF
0.1µF
GND
V- = -2.5V
*DRIVE SHDN TO V- FOR LOW-POWER SHUTDOWN MODE.
Figure 4. Dual-Supply Operation
Table 1. Typical Harmonic Distortion
FILTER
fCLK
fC
fIN
(kHz)
(kHz)
(Hz)
100
1
200
MAX7480
200
2
400
VIN
(Vp-p)
4
TYPICAL HARMONIC DISTORTION (dB)
2nd
3rd
4th
5th
-89
-73
-91
-93
-82
-68
-85
-89
Chip Information
TRANSISTOR COUNT: 1116
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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