MAX4309ESA 查看數據表（PDF） - Maxim Integrated
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MAX4309ESA Datasheet PDF : 12 Pages
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400MHz, Ultra-Low-Distortion Op Amps
before the reactive load prevents ringing and oscilla-
tion. At higher capacitive loads, AC performance will be
controlled by the interaction of the load capacitance
and isolation resistor. Figures 3a–3c show the effect of
an isolation resistor on the MAX4108/MAX4109/
MAX4308/MAX4309 closed-loop response.
Coaxial cable and other transmission lines are easily
driven when terminated at both ends with their charac-
teristic impedance. When driving back-terminated
transmission lines, the capacitance of the transmission
line is essentially eliminated.
ADC Input Buffers
Input buffer amplifiers can be a source of significant
errors in high-speed ADC applications. The input buffer
is usually required to rapidly charge and discharge the
ADC’s input, which is often capacitive (see the section
Driving Capacitive Loads). In addition, a high-speed
ADC’s input impedance often changes very rapidly
during the conversion cycle, requiring an amplifier with
very low output impedance at high frequencies to main-
tain measurement accuracy. The combination of high
speed, fast slew rate, low noise, and a low and stable
distortion over load makes the MAX4108/MAX4109/
MAX4308/MAX4309 ideally suited for use as buffer
amplifiers in high-speed ADC applications.
11
10 CL = 10pF
AVCL = +2
9
8
7
RS = 8.2Ω
6
5
4
3
2
1
0.1
RS = 15Ω
1
10
100
1000
FREQUENCY (MHz)
Figure 3b. MAX4308 Response vs. Capacitive Load with
Resistive (RS) Isolation (circuit shown in Figure 1a)
12
10 CL = 10pF
AVCL = +1
8
6
4
RS = 10Ω
RS = 22Ω
2
0
-2
RS = 30Ω
-4
-6
-8
0.1
1
10
100
1000
FREQUENCY (MHz)
Figure 3a. MAX4108 Response vs. Capacitive Load with
Resistive (RS) Isolation (circuit shown in Figure 1a)
4
3 CL = 10pF
AV = +5
2
1
0
-1
RS = 8.2Ω
-2
RS = 15Ω
-3
RS = 47Ω
-4
-5
-6
0.1
1
10
100
1000
FREQUENCY (MHz)
Figure 3c. MAX4108/MAX4309 Response vs. Capacitive Load
with Resistive (RS) Isolation (circuit shown in Figure 1a)
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