參數(shù)資料
型號(hào): MAX4090
廠商: Maxim Integrated Products, Inc.
英文描述: 3V/5V, 6dB Video Buffer with Sync-Tip Clamp and 150nA Shutdown Current
中文描述: 3V/5V、6dB視頻緩沖器,具有同步頭鉗位和150nA關(guān)斷電流
文件頁(yè)數(shù): 8/12頁(yè)
文件大小: 651K
代理商: MAX4090
M
between 20
to 100
is needed to isolate the input
capacitor (C4) to the filter to prevent the oscillation
problem.
Figure 2 shows the frequency response for R1 = R2 =
150
. At 6MHz, the attenuation is about 1.4dB. The
attenuation at 27MHz is about 20dB. Figure 3 shows
the multiburst response for R1 = R2 = 150
.
3rd-Order Butterworth Lowpass Filter Realization
If more flat passband and more stopband attenuation
are needed, a 3rd-order LPF can be used. The design
procedures are similar to the 2nd-order butterworth
LPF.
Table 3 shows the normalized 3rd-order butterworth
lowpass filter with the cutoff frequency at 1 rad/s and
the stopband frequency at 3 rad/s. Table 4 shows the
appropriated L and C values for different source/load
impedance and the bench measurement values for
-3dB BW and attenuation at 27MHz. The attenuation is
over 40dB at 27MHz. At 6MHz, the attenuation is
approximately 0.6dB for R1 = R2 = 150
(Figure 5).
C
C
f R
π
L
L R
2
π
f
n
C
=
=
2
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
8
_______________________________________________________________________________________
0.1
1
10
100
FREQUENCY RESPONSE
FREQUENCY (MHz)
G
0
-60
-50
-40
-30
-20
-10
R2
150
R1
150
C1
150pF
L1
3.9
μ
H
C4
0.1
μ
F
R3
75
C7
1
μ
F
IN
OUT
GND
FB
SHDN
V
CC
V
CC
V
CC
V
OUT
4
2
3
5
6
1
VIDEO
CURRENT
DAC
R
IS
49.9
2-POLE RECONSTRUCTION LPF
MAX4090
Figure 1. 2nd-Order Butterworth LPF with MAX4090
Figure 2. Frequency Response
V
OUT
500mV/div
10
μ
s/div
V
IN
500mV/div
Figure 3. Multiburst Response
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