MAX296EWE 查看數據表（PDF） - Maxim Integrated
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MAX296EWE Datasheet PDF : 10 Pages
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MAX291/MAX292/MAX295/MAX296
8th-Order, Lowpass,
Switched-Capacitor Filters
INPUT
22k
R1
C2
1500pF
22k
R2 330pF
C1
22k
R3
4 OP IN
3
OP OUT
OUTPUT
MAX29_
Pin Configuration is 8-pin DIP/SO.
Figure 4. Uncommitted Op Amp Configured as a 2nd-Order
Butterworth Lowpass Filter (Fo = 10kHz)
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.
DAC Post-Filtering
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
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.
Table 2. Typical Harmonic Distortion (dB)
Filter
Harmonic
2nd
3rd
4th
5th
MAX291
-72
-78
-83
-89
MAX292
-71
-82
-82
-88
MAX295
-93
-86
-92
-97
MAX296
-71
-89
-96
-96
_Ordering Information (continued)
PART
TEMP. RANGE PIN-PACKAGE
MAX292CPA
0°C to +70°C
8 Plastic DIP
MAX292CSA
0°C to +70°C
8 SO
MAX292CWE
0°C to +70°C
16 Wide SO
MAX292C/D
0°C to +70°C
Dice*
MAX292EPA
-40°C to +85°C
8 Plastic DIP
MAX292ESA
-40°C to +85°C
8 SO
MAX292EWE
-40°C to +85°C
16 Wide SO
MAX292MJA
-55°C to +125°C 8 CERDIP**
MAX295CPA
0°C to +70°C
8 Plastic DIP
MAX295CSA
0°C to +70°C
8 SO
MAX295CWE
0°C to +70°C
16 Wide SO
MAX295C/D
0°C to +70°C
Dice*
MAX295EPA
-40°C to +85°C
8 Plastic DIP
MAX295ESA
-40°C to +85°C
8 SO
MAX295EWE
-40°C to +85°C
16 Wide SO
MAX295MJA
-55°C to +125°C 8 CERDIP**
MAX296CPA
0°C to +70°C
8 Plastic DIP
MAX296CSA
0°C to +70°C
8 SO
MAX296CWE
0°C to +70°C
16 Wide SO
MAX296C/D
0°C to +70°C
Dice*
MAX296EPA
-40°C to +85°C
8 Plastic DIP
MAX296ESA
-40°C to +85°C
8 SO
MAX296EWE
-40°C to +85°C
16 Wide SO
MAX296MJA
-55°C to +125°C 8 CERDIP**
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883.
8
Maxim Integrated
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