EL5451IS Intersil, EL5451IS Datasheet - Page 13

• Manufacturer Part Number: EL5451IS
• Description: IC AMP 200MHZ V-FB 14-SOIC
• Manufacturer: Intersil

Specifications of EL5451IS

• Amplifier Type: Voltage Feedback
• Number Of Circuits: 4
• Slew Rate: 100 V/µs
• Gain Bandwidth Product: 40MHz
• -3db Bandwidth: 200MHz
• Current - Input Bias: 20nA
• Voltage - Input Offset: 500µV
• Current - Supply: 1.35mA
• Current - Output / Channel: 70mA
• Voltage - Supply, Single/dual (±): 5 V ~ 12 V, ±2.5 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -

Power Supply Bypassing Printed Circuit Board
Layout
As with any high frequency device, a good printed circuit
board layout is necessary for optimum performance. Lead
lengths should be as short as possible. The power supply
pin must be well bypassed to reduce the risk of oscillation.
For normal single supply operation, where the V
connected to the ground plane, a single 4.7µF tantalum
capacitor in parallel with a 0.1µF ceramic capacitor from V
to GND will suffice. This same capacitor combination should
be placed at each supply pin to ground if split supplies are to
be used. In this case, the V
supply rail.
Printed Circuit Board Layout
For good AC performance, parasitic capacitance should be
kept to a minimum. Use of wire wound resistors should be
avoided because of their additional series inductance. Use
of sockets should also be avoided if possible. Sockets add
parasitic inductance and capacitance that can result in
V1
R1
1k
1k
R2
C2
S
RA
- pin becomes the negative
13
1n
1k
EL5150, EL5151, EL5250, EL5251, EL5451
1n
C1
1k
RB
3
2
V3
+
-
U1A
V2
FIGURE 41. SALLEN KEY LOW PASS FILTER
11
V+
V-
4
S
5V
5V
- pin is
1
0.1µF
0.1µF
S
+
R7
V
OUT
1k
compromised performance. Minimizing parasitic capacitance
at the amplifier's inverting input pin is very important. The
feedback resistor should be placed very close to the
inverting input pin. Strip line design techniques are
recommended for the signal traces.
Application Circuits
Sallen Key Low Pass Filter
A common and easy to implement filter taking advantage of
the wide bandwidth, low offset and low power demands of
the EL5150. A derivation of the transfer function is provided
for convenience (see Figure 41).
Sallen Key High Pass Filter
Again, this useful filter benefits from the characteristics of the
EL5150. The transfer function is very similar to the low pass
so only the results are presented (see Figure 42).
K
( H
( H
Holp
Holp
Vo
wo
Q
wo
Q
V
1
=
) s
R
jw
=
=
−
=
=
=
1
1
1 (
3
=
)
Vi
+
K
=
=
RC
=
−
−
1
R
1
K
K
R
R
R
1
R
K
1
K
1
B
A
+
1
2
C
−
C
)
C
1
K
1
1
R
w
1
2
R
R
Vo
R
R
s
−
2
2
2
2
C
1
2
R
+
V
C
C
C
2
1
1
1
2
1
C
2
Equations simplify if we let all
components be equal R = C
s
V
+
2
1
+
R
1
+
Vo
2
1
((
C
C
R
R
1
1
−
1
2
1
2
s
−
C
+
C
Vi
2
K
1
jw
R )
=
+
((
K
0
1
1
C
1
R
−
R
1
2
K
+
1
C
C
R )
R
1
2
1
1
C
C
2
1
+
+
R
R
January 16, 2008
21
1
C
C
2
2
+
s )
FN7384.7
R
+
2
C
1
2
)