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參數(shù)資料
| 型號： | MAX4090EXT-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3V/5V, 6dB Video Buffer with Sync-Tip Clamp and 150nA Shutdown Current |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO6 |
| 封裝： | ROHS COMPLIANT, SC-70, 6 PIN |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 651K |
| 代理商： | MAX4090EXT-T |
M
3V/5V, 6dB Video Buffer with Sync-Tip Clamp
and 150nA Shutdown Current
_______________________________________________________________________________________
9
R1 = R2
(
)
C1
(p f
L1
(μH)
R
IS
(
)
3dB
BW
(MHz)
A T T EN U A T O N
AT 27MHz
(dB)
75
150
200
300
330
150
120
82
1.8
3.9
4.7
8.2
0
50
50
100
8.7
9.0
9.3
8.7
20
20
22
20
Table 2. Bench Measurement Values
Rn1 = Rn2
(
)
Cn1 (F)
Cn2 (F)
Cn3 (F)
Ln1 (H)
1
0.923
0.923
0.06
1.846
Table 3. 3rd-Order Butterworth Lowpass
Filter Normalized Values
R2
150
R1
150
C1
120pF
C2
120pF
L1
4.7
μ
H
C3
6.8pF
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
3-POLE RECONSTRUCTION LPF
MAX4090
Figure 4. 3rd-Order Butterworth LPF with MAX4090
R1 = R2 (
)
C1 (pF)
C2 (pF)
C3 (pF)
L (μH)
R
IS
(
)
3dB BW (MHz)
ATTENUATION AT
27MHz (dB)
75
150
300
220
120
56
220
120
56
15.0
6.8
3.3
2.2
4.7
10.0
0
50
100
9.3
8.9
9.0
43
50
45
Table 4. Bench Measurement Values
Sag Correction
In a 5V application, the MAX4090 can use the sag con-
figuration if an AC-coupled output video signal is
required. Sag correction refers to the low-frequency
compensation for the highpass filter formed by the
150
load and the output capacitor. In video applica-
tions, the cutoff frequency must be low enough to pass
the vertical sync interval to avoid field tilt. This cutoff
frequency should be less than 5Hz, and the coupling
capacitor must be very large in normal configuration,
typically > 220μF. In sag configuration, the MAX4090
eliminates the need for large coupling capacitors, and
instead requires two 22μF capacitors (Figure 6) to
reach the same performance as the large capacitor.
Bench experiments show that increasing the output
coupling capacitor C5 beyond 47μF does not improve
the performance. If the supply voltage is less than 4.5V,
the sag correction is not recommended for the
MAX4090.
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