MAX7421EUA+T Maxim Integrated Products, MAX7421EUA+T Datasheet - Page 12

• Manufacturer Part Number: MAX7421EUA+T
• Description: IC FILTER LOWPASS 5TH 8UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX7421EUA+T

• Filter Type: Elliptic, Lowpass Switched Capacitor
• Frequency - Cutoff Or Center: 45kHz
• Number Of Filters: 1
• Max-order: 5th
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• For Use With: MAXFILTERBRD+ - BOARD EVAL MAX7408/7415/418-7425
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Characteristics table for the input voltage range of COM
and OS. Changing the voltage on COM or OS signifi-
cantly from midsupply reduces the dynamic range.
The MAX7418–MAX7421 operate from a single +5V
supply and the MAX7422–MAX7425 operate from a sin-
gle +3V supply. Bypass V
capacitor. If dual supplies are required, connect COM
to the system ground and GND to the negative supply.
Figure 5 shows an example of dual-supply operation.
Single-supply and dual-supply performance are equiv-
alent. For either single-supply or dual-supply operation,
drive CLK and SHDN from GND (V- in dual supply
operation) to V
±2.5, and use the MAX7422–MAX7425 for ±1.5V. For
±5V dual-supply applications, refer to the MAX291/
MAX292/MAX295/MAX296 and MAX293/MAX294/
MAX297 data sheets.
The optimal input signal range is determined by observ-
ing the voltage level at which the signal-to-noise plus
distortion (SINAD) ratio is maximized for a given corner
frequency. The Typical Operating Characteristics show
the THD + Noise response as the input signal’s peak-to-
peak amplitude is varied.
When using the MAX7418–MAX7425 for anti-aliasing or
post-DAC filtering, synchronize the DAC (or ADC) and
the filter clocks. If the clocks are not synchronized, beat
frequencies may alias into the desired passband.
5th-Order, Lowpass,
Switched-Capacitor Filters
Table 1. MAX7418/MAX7421/MAX7422/MAX7425 Typical Harmonic Distortion
12
MAX7418
MAX7421
MAX7422
MAX7425
______________________________________________________________________________________
FILTER
Anti-Aliasing and Post-DAC Filtering
DD
Input Signal Amplitude Range
. Use the MAX7418–MAX7421 for
(MHz)
f
CLK
2.2
1.5
2.2
1.5
4.0
2.2
4.0
2.2
DD
to GND with a 0.1µF
Power Supplies
(kHz)
f
2
2
2
2
4
2
4
2
IN
(Vp-p)
V
Harmonic distortion arises from nonlinearities within the
filter. These nonlinearities generate harmonics when a
pure sine wave is applied to the filter input. Tables 1, 2,
and 3 list typical harmonic distortion values with a 10kΩ
load at T
4
4
2
2
Figure 5. Dual-Supply Operation
IN
V+
V-
*CONNECT SHDN TO V- FOR LOW-POWER SHUTDOWN MODE.
A
= +25°C.
CLOCK
<-80
<-80
<-80
<-80
<-80
<-80
<-80
<-80
INPUT
2nd
TYPICAL HARMONIC DISTORTION (dB)
IN
CLK
MAX7418–
<-80
<-80
<-80
<-80
<-80
<-80
<-80
<-80
MAX7425
3rd
V
GND
V+
DD
V-
Harmonic Distortion
SHDN
COM
OUT
OS
<-80
<-80
<-80
<-80
<-80
<-80
<-80
<-80
*
4th
0.1μF
OUTPUT
0.1μF
<-80
<-80
<-80
<-80
<-80
<-80
<-80
<-80
5th