MAX4103 データシートの表示（PDF） - Maxim Integrated
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MAX4103 Datasheet PDF : 12 Pages
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250MHz, Broadcast-Quality, Low-Power
Video Op Amps
The input capacitance of the MAX4102/MAX4103 is
approximately 2pF. In either the inverting or noninvert-
ing configuration, the bandwidth limit caused by the
package capacitance and resistor time constant is
f3dB = 1 / (2Π RC), where R is the parallel combination
of the input and feedback resistors (RF and RG in
Figure 2) and C is the package and board capacitance
at the inverting input. RS1 and RS2 represent the input
termination resistors. Table 1 shows the typical band-
width and resistor values for several gain configura-
tions.
RG
VIN
RT
RF
MMAAXX41020
MMAAXX41031
VOUT = -(RF / RG)VIN
Figure 1a. Inverting Gain Configuration
RG
RF
VIN
VOUT = [1 + (RF / RG)]VIN
MMAAXX441020
MMAAXX441031
RT
Figure 1b. Noninverting Gain Configuration
VOUT
VOUT
Table 1. Resistor and Bandwidth Values
for Various Gain Configurations
DEVICE
GAIN
(V/V)
RG
(Ω)
RF
(Ω)
RT
(Ω)
BAND-
WIDTH
(MHz)
MAX4102
1
∞
24
50
250
MAX4102
2
200 200
50
100
MAX4103
2
200 200
50
180
MAX4103
5
50
200
50
40
MAX4103 10
30
270
50
20
MAX4103 -1
200 200
56
180
MAX4103 -2
75
150 150
140
MAX4103 -5
50
250
∞
75
MAX4103 -10
50
500
∞
35
Note: Refer to Figure 1a for inverting gain configurations and
Figure 1b for noninverting gain configurations. RT is calculated
for 50Ω systems.
Resistor Types
Surface-mount resistors are the best choice for high-
frequency circuits. They are of similar material to the
metal-film resistors, but are deposited using a thick-film
process in a flat, linear manner so that inductance is
minimized. Their small size and lack of leads also mini-
mize parasitic inductance and capacitance, thereby
yielding more predictable performance.
RG
RF
VIN
RS1
24Ω
C
MAX4110002
VOUT
MAX4110013
MMAAXX441020
VOUT
MMAAXX441031
RS2
VIN
VOUT = VIN
Figure 1c. MAX4102 Unity-Gain Buffer Configuration
Figure 2. Effect of Feedback Resistor Values and Parasitic
Capacitance on Bandwidth
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