MAX7405CPA+ Maxim Integrated Products, MAX7405CPA+ Datasheet - Page 9

• Manufacturer Part Number: MAX7405CPA+
• Description: IC FILTER LOWPASS 8-DIP
• Manufacturer: Maxim Integrated Products

Specifications of MAX7405CPA+

• Filter Type: Bessel, Lowpass Switched Capacitor
• Frequency - Cutoff Or Center: 5kHz
• Number Of Filters: 1
• Max-order: 8th
• Voltage - Supply: 2.7 V ~ 3.6 V
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 1. Typical Harmonic Distortion
Figure 4. Dual-Supply Operation
GND to the negative supply. Figure 4 shows an example
of dual-supply operation. Single- and dual-supply perfor-
mance are equivalent. For either single- or dual-supply
operation, drive CLK and SHDN from GND (V- in dual-
supply operation) to V
tions, use the MAX291–MAX297.
The optimal input signal range is determined by observ-
ing the voltage level at which the total harmonic distor-
tion plus noise (THD+N) is minimized for a given corner
frequency. The Typical Operating Characteristics show
graphs of the devices’ THD+N response as the input
signal’s peak-to-peak amplitude is varied. These mea-
surements are made with OS and COM biased at mid-
supply.
V+
V-
*DRIVE SHDN TO V- FOR LOW-POWER SHUTDOWN MODE.
MAX7401
MAX7405
FILTER
CLOCK
INPUT
Input Signal Amplitude Range
_______________________________________________________________________________________
(kHz)
IN
CLK
f
100
500
100
500
CLK
DD
. For ±5V dual-supply applica-
MAX7401
MAX7405
V
GND
V+
DD
V-
(kHz)
f
1
5
1
5
C
SHDN
COM
OUT
OS
*
0.1 F
OUTPUT
1000
1000
(Hz)
200
200
f
IN
8th-Order, Lowpass, Bessel,
0.1 F
Switched-Capacitor Filters
(Vp-p)
V
4
2
IN
When using the MAX7401/MAX7405 for anti-aliasing or
post-DAC filtering, synchronize the DAC and the filter
clocks. If the clocks are not synchronized, beat frequen-
cies 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 passband.
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 MAX7401/MAX7405’s typical harmonic-distortion
values with a 10kΩ load at T
TRANSISTOR COUNT: 1116
Anti-Aliasing and Post-DAC Filtering
2nd
-91
-89
-87
-83
TYPICAL HARMONIC DISTORTION (dB)
3rd
-83
-79
-83
-82
A
Chip Information
= +25°C.
Harmonic Distortion
4th
-90
-92
-87
-88
5th
-93
-92
-88
-88
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