EL5246CY-T7 INTERSIL [Intersil Corporation], EL5246CY-T7 Datasheet - Page 18

• Manufacturer Part Number: EL5246CY-T7
• Description: 100MHz Single-Supply Rail-to-Rail Amplifiers
• Manufacturer: INTERSIL [Intersil Corporation]

graph of propagation delay vs. overdrive as a square wave is
presented at the input of the comparator.
Multiplexing with the EL5144 Series Amplifier
Besides normal power down usage, the CE pin on the
EL5146 and EL5246 series amplifiers also allow for
multiplexing applications. Figure 5 shows an EL5246 with its
outputs tied together, driving a back terminated 75Ω video
load. A 3V
and a 2.4V
shows the SELECT signal that is applied, and the resulting
output waveform at V
operation of the multiplexing. Amp A is on and V
passed through to the output of the amplifier. Then Amp A
turns off in about 10ns. The output decays to ground with an
R
is passed through to the output. This break-before-make
operation ensures that more than one amplifier isn’t trying to
drive the bus at the same time. Notice the outputs are tied
L
C
L
+2.5V
time constants. 500ns later, Amp B turns on and V
1000
100
V
10
IN
P-P
0.01
P-P
Propagation Delay vs. Overdrive for Amplifier
Used as a Comparator
+
–
10MHz sine wave is applied at Amp A input,
5MHz square wave to Amp B. Figure 6
Positive Going Signal
1
2
3
4
OUT
EL5146
+
-
FIGURE 3.
FIGURE 4.
. Observe the break-before-make
Overdrive (V)
18
0.1
Negative Going Signal
8
7
6
5
EL5144, EL5146, EL5244, EL5246, EL5444
+5V
0.1µF
V
R
OUT
L
1.0
IN1
is being
IN2
directly together. Isolation resistors at each output are not
necessary.
Free Running Oscillator Application
Figure 7 is an EL5144 configured as a free running oscillator.
To first order, R
oscillation according to:
For rail to rail output swings, maximum frequency of
oscillation is around 15MHz. If reduced output swings are
acceptable, 25MHz can be achieved. Figure 8 shows the
F
OSC
Select
Select
V
OUT
=
10MHz
2.4V
---------------------------------------
R
5V
0V
5V
0V
5MHz
V
3V
V
OSC
IN
IN
PP
PP
OSC
1
2
0.72
×
C
and C
OSC
1
2
3
4
5
6
7
FIGURE 5.
FIGURE 6.
OSC
EL5246
+
+
-
-
determine the frequency of
14
13
12
11
10
9
8
4.7µF
0.1µF
150Ω
V
+5V
OUT