el5192a Intersil Corporation, el5192a Datasheet - Page 14

• Manufacturer Part Number: el5192a
• Description: 600mhz Current Feedback Amplifier With Enable
• Manufacturer: Intersil Corporation

Applications Information
Product Description
The EL5192 is a current-feedback operational amplifier that
offers a wide -3dB bandwidth of 600MHz and a low supply
current of 6mA per amplifier. The EL5192 works with supply
voltages ranging from a single 5V to 10V and they are also
capable of swinging to within 1V of either supply on the
output. Because of their current-feedback topology, the
EL5192 does not have the normal gain-bandwidth product
associated with voltage-feedback operational amplifiers.
Instead, its -3dB bandwidth to remain relatively constant as
closed-loop gain is increased. This combination of high
bandwidth and low power, together with aggressive pricing
make the EL5192 the ideal choice for many low-power/high-
bandwidth applications such as portable, handheld, or
battery-powered equipment.
For varying bandwidth needs, consider the EL5191 with 1GHz
on a 9mA supply current or the EL5193 with 300MHz on a 4mA
supply current. Versions include single, dual, and triple amp
packages with 5 Ld SOT-23, 16 Ld QSOP, and 8 Ld or 16 Ld
SOIC outlines.
Pin Descriptions
8 Ld SOIC
1, 5
2
3
4
6
7
8
5 Ld SOT-23
4
3
2
1
5
14
6 Ld SOT-23
4
3
2
1
6
5
PIN NAME
OUT
V
IN+
V
NC
IN-
CE
S
S
+
-
EL5192, EL5192A
Not connected
Inverting input
Non-inverting input
Negative supply
Output
Positive supply
Chip enable
FUNCTION
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high frequency device, good printed circuit
board layout is necessary for optimum performance. Low
impedance ground plane construction is essential. Surface
mount components are recommended, but if leaded
components are used, lead lengths should be as short as
possible. The power supply pins must be well bypassed to
reduce the risk of oscillation. The combination of a 4.7µF
tantalum capacitor in parallel with a 0.01µF capacitor has
been shown to work well when placed at each supply pin.
For good AC performance, parasitic capacitance should be
kept to a minimum, especially at the inverting input. (See the
Capacitance at the Inverting Input section) Even when ground
plane construction is used, it should be removed from the area
near the inverting input to minimize any stray capacitance at
that node. Carbon or Metal-Film resistors are acceptable with
the Metal-Film resistors giving slightly less peaking and
bandwidth because of additional series inductance. Use of
sockets, particularly for the SOIC package, should be avoided if
possible. Sockets add parasitic inductance and capacitance
which will result in additional peaking and overshoot.
(See circuit 1)
IN+
CE
EQUIVALENT CIRCUIT
Circuit 1
Circuit 2
Circuit 3
V
OUT
V
S
S
+
-
V
V
S
S
V
V
+
-
S
IN-
S
+
-
May 16, 2007
FN7181.3