MAX291ESA+ Maxim Integrated Products, MAX291ESA+ Datasheet - Page 8

• Manufacturer Part Number: MAX291ESA+
• Description: IC FILTER LOWPASS 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX291ESA+

• Filter Type: Butterworth, Lowpass Switched Capacitor
• Frequency - Cutoff Or Center: 25kHz
• Number Of Filters: 1
• Max-order: 8th
• Voltage - Supply: 4.75 V ~ 11 V, ±2.375 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Number Of Channels: Single
• Cutoff Frequency: 25 KHz
• Supply Voltage (max): 11 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Voltage (min): 4.75 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

order continuous lowpass filter. This filter is convenient for
anti-aliasing applications, or for clock noise attenuation at
the switched-capacitor filter’s output. Figure 4 shows a
2nd-order lowpass Butterworth filter built using the
uncommitted op amp with a 10kHz corner frequency.
This filter’s input resistance of 22k satisfies the minimum
load requirements of the switched-capacitor filter.
The uncommitted op amp (with a 2MHz gain bandwidth
product) can alternatively be used at the input of the
switched-capacitor filter to help reduce any possible
clock ripple feedthrough to the output.
When using the MAX291/MAX292/MAX295/MAX296 for
DAC post-filtering, synchronize the DAC and the filter
clocks. If clocks are not synchronized, beat frequen-
cies will alias into the desired passband. The DAC’s
clock should be generated by dividing down the
switched-capacitor filter’s clock.
Harmonic distortion arises from nonlinearities within the
filters. These nonlinearities generate harmonics when a
pure sine wave is applied to the filter input. Table 2 lists
typical harmonic distortion values for the MAX291/
MAX292/MAX295/MAX296 with a 1kHz 5Vp-p sine-wave
input signal, a 1MHz clock frequency, and a 5kΩ load.
8th-Order, Lowpass,
Switched-Capacitor Filters
Figure 4. Uncommitted Op Amp Configured as a 2nd-Order
Butterworth Lowpass Filter (F
Table 2. Typical Harmonic Distortion (dB)
8
Pin Configuration is 8-pin DIP/SO.
Filter
INPUT
_______________________________________________________________________________________
22k
R1
1500pF
MAX291
MAX292
MAX295
MAX296
C2
22k
22k
R2
R3
Harmonic
o
2nd
-72
-71
-93
-71
330pF
= 10kHz)
4
OP IN
Harmonic Distortion
MAX29_
DAC Post-Filtering
OP OUT
3rd
-78
-82
-86
-89
C1
3
4th
-83
-82
-92
-96
OUTPUT
5th
-89
-88
-97
-96
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883.
_Ordering Information (continued)
MAX292CPA
MAX292CSA
MAX292CWE
MAX292C/D
MAX292EPA
MAX292ESA
MAX292EWE
MAX292MJA
MAX295CPA
MAX295CSA
MAX295CWE
MAX295C/D
MAX295EPA
MAX295ESA
MAX295EWE
MAX295MJA
MAX296CPA
MAX296CSA
MAX296CWE
MAX296C/D
MAX296EPA
MAX296ESA
MAX296EWE
MAX296MJA
PART
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
8 Plastic DIP
8 SO
16 Wide SO
Dice*
8 Plastic DIP
8 SO
16 Wide SO
8 CERDIP**
8 Plastic DIP
8 SO
16 Wide SO
Dice*
8 Plastic DIP
8 SO
16 Wide SO
8 CERDIP**
8 Plastic DIP
8 SO
16 Wide SO
Dice*
8 Plastic DIP
8 SO
16 Wide SO
8 CERDIP**
PIN-PACKAGE