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參數(shù)資料
| 型號： | MAX477 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 300MHz High-Speed Op Amp(300MHz 高速運算放大器) |
| 中文描述： | 300MHz、高速運算放大器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 176K |
| 代理商： | MAX477 |
M
300MHz High-S peed Op Amp
10
______________________________________________________________________________________
Flash ADC Preamp
The MAX477’s high output-drive capability and ability
to drive capacitive loads make it well suited for buffer-
ing the low-impedance input of a high-speed flash
ADC. With its low output impedance, the MAX477 can
drive the inputs of the ADC while maintaining accuracy.
Figure 7 shows a preamp for digitizing video, using the
250Msps MAX100 and the 500Msps MAX101 flash
ADCs. Both of these ADCs have a 50
input resistance
and a 1.2GHz input bandwidth.
High-Performanc e V ideo
Distribution Amplifier
In a gain of +2 configuration, the MAX477 makes an
excellent driver for back-terminated 75
video coaxial
cables (Figure 8). The high output-current drive allows
the attachment of up to six ±2Vp-p, 150
loads to the
MAX477 at +25°C. With the output limited to ±1Vp-p,
the number of loads may double. The MAX4278 is a
similar amplifier configured for a gain of +2 without the
need for external gain-setting resistors. For multiple
gain-of-2 video line drivers in a single package, see the
MAX496/MAX497 data sheet.
Wide-Bandwidth Bessel Filter
Two high-impedance inputs allow the MAX477 to be
used in all standard active filter topologies. The filter
design is straightforward because the component val-
ues can be chosen independently of op amp bias.
Figure 9 shows a wide-bandwidth, second-order Bessel
filter using a multiple feedback topology. The compo-
nent values are chosen for a gain of +2, a -3dB band-
width of 10MHz, and a 28ns delay. Figure 10a shows a
square-wave pulse response, and Figure 10b shows the
filter’s frequency response and delay. Notice the flat
delay in the passband, which is characteristic of the
Bessel filter.
MAX477
V
OUT
V
IN
R
ISO
C
L
R
L
Figure 5. Capacitive-Load Driving Circuit
MAX477
VIDEOIN
75
500
500
75
75
75
75
75
75
75
75
OUT1
OUT2
OUTN
Figure 8. High-Performance Video Distribution Amplifier
MAX477
VIDEOIN
500
500
FLASH ADC
(MAX100/MAX101)
Figure 7. Preamp for Video Digitizer
Figure 6. Effect of C
LOAD
on Frequency Response With
Isolation Resistor
1
0
-1
-2
1M
10M
FREQUENCY (Hz)
100M
1G
-6
-3
-4
-5
G
C
L
= 0pF
R
ISO
= 20
C
L
= 22pF
C
L
= 47pF
C
L
= 100pF
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