MAX7480ESA+ Maxim Integrated Products, MAX7480ESA+ Datasheet - Page 8

• Manufacturer Part Number: MAX7480ESA+
• Description: IC FILTER LOWPASS 8TH 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX7480ESA+

• Filter Type: Butterworth, Lowpass Switched Capacitor
• Frequency - Cutoff Or Center: 2kHz
• Number Of Filters: 4
• Max-order: 8th
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Number Of Channels: Single
• Cutoff Frequency: 2 KHz
• Supply Voltage (max): 5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Voltage (min): 4.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
© 1999 Maxim Integrated Products
8th-Order, Lowpass, Butterworth,
Switched-Capacitor Filter
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 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 T
Table 1. Typical Harmonic Distortion
_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
MAX7480
FILTER
Anti-Aliasing and Post-DAC Filtering
A
= +25°C.
(kHz)
f
100
200
CLK
Harmonic Distortion
(kHz)
f
1
2
C
Printed USA
(Hz)
200
400
f
IN
(Vp-p)
V
4
IN
Figure 4. Dual-Supply Operation
TRANSISTOR COUNT: 1116
V+
V-
*DRIVE SHDN TO V- FOR LOW-POWER SHUTDOWN MODE.
is a registered trademark of Maxim Integrated Products.
CLOCK
INPUT
2nd
-89
-82
TYPICAL HARMONIC DISTORTION (dB)
IN
CLK
3rd
-73
-68
V+ = +2.5V
MAX7480
V- = -2.5V
V
GND
Chip Information
DD
SHDN
COM
OUT
4th
-91
-85
OS
*
0.1 F
OUTPUT
5th
-93
-89
0.1 F