MAX4315 Maxim, MAX4315 Datasheet - Page 15

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MAX4315

Manufacturer Part Number
MAX4315
Description
The MAX4310–MAX4315 single-supply mux-amps combine high-speed operation, low-glitch switching, and excellent video specifications
Manufacturer
Maxim
Datasheet

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The MAX4310–MAX4315 are well-suited to drive coaxial
transmission lines when the cable is terminated at both
ends, as shown in Figure 5. Cable frequency response
can cause variations in the signal’s flatness.
A correctly terminated transmission line is purely resis-
tive and presents no capacitive load to the amplifier.
Reactive loads decrease phase margin and may pro-
duce excessive ringing and oscillation (see Typical
Operating Characteristics).
Figure 10. High-Speed EV Board Layout—Component Side
Figure 11. High-Speed EV Board Layout—Solder Side
Multichannel, Video Multiplexer-Amplifiers
______________________________________________________________________________________
High-Speed, Low-Power, Single-Supply
Driving Capacitive Loads
Video Line Driver
Another concern when driving capacitive loads origi-
nates from the amplifier’s output impedance, which
appears inductive at high frequencies. This inductance
forms an L-C resonant circuit with the capacitive load,
which causes peaking in the frequency response and
degrades the amplifier’s phase margin.
Although the MAX4310–MAX4315 are optimized for AC
performance and are not designed to drive highly capaci-
tive loads, they are capable of driving up to 20pF without
oscillations. However, some peaking may occur in the fre-
quency domain (Figure 6). To drive larger capacitive
loads or to reduce ringing, add an isolation resistor
between the amplifier’s output and the load (Figure 7).
The value of RISO depends on the circuit’s gain and
the capacitive load (Figure 8). Figure 9 shows the
MAX4310–MAX4315 frequency response with the isola-
tion resistor and a capacitive load. With higher capaci-
tive values, bandwidth is dominated by the RC network
formed by R
itself is much higher. Also note that the isolation resistor
forms a divider that decreases the voltage delivered to
the load.
Table 2. Input Control Logic
S S S S H H H H D D D D N N N N
S S S S H H H H D D D D N N N N
S S S S H H H H D D D D N N N N
0
1
1
0
1
1
1
1
0
1
1
1
1
1
1
1
1
A2
A2
A2
ISO
X
0
0
0
0
1
1
1
1
and C
MAX4311/MAX4314
MAX4312/MAX4315
MAX4310/MAX4313
A1
A1
A1
X
X
0
0
1
1
0
0
1
1
0
0
1
1
L
; the bandwidth of the amplifier
A0
A0
A0
X
0
1
X
0
1
0
1
X
0
1
0
1
0
1
0
1
CHANNEL SELECTED
CHANNEL SELECTED
CHANNEL SELECTED
None, High-Z Output
None, High-Z Output
None, High-Z Output
0
1
0
1
2
3
0
1
2
3
4
5
6
7
15