LT1800CS8 查看數據表（PDF） - Linear Technology
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LT1800CS8 Datasheet PDF : 18 Pages
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LT1800
TYPICAL APPLICATIONS
Single 3V Supply, 1MHz, 4th Order Butterworth Filter
The circuit shown in Figure 4 makes use of the low voltage
operation and the wide bandwidth of the LT1800 to create
a DC accurate 1MHz 4th order lowpass filter powered from
a 3V supply. The amplifiers are configured in the inverting
mode for the lowest distortion and the output can swing
rail-to-rail for maximum dynamic range. Figure 5 displays
the frequency response of the filter. Stopband attenuation
is greater than 100dB at 50MHz. With a 2.25VP-P, 250kHz
input signal, the filter has harmonic distortion products
of less than –85dBc. Worst-case output offset voltage is
less than 6mV.
909Ω
VIN
909Ω
2.67k
220pF
47pF
–
LT1800
+
VS/2
1.1k
1.1k
2.21k
22pF 3V
–
470pF
LT1800
+
1800 F04
VOUT
Figure 4. 3V, 1MHz, 4th Order Butterworth Filter
0
–20
–40
–60
–80
–100
–120
1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
1800 F05
Figure 5. Frequency Response of Filter
1800fa
15
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