12
FN7193.3
July 26, 2007
Applications Information
Product Description
The EL5293 is a current-feedback operational amplifier that
offers a wide -3dB bandwidth of 300MHz and a low supply
current of 4mA per amplifier. The EL5293 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
EL5293 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 EL5293 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 EL5192 with 600MHz
on a 6mA supply current. Versions include single, dual, and
triple amp packages with 5 Ld SOT23, 16 Ld QSOP, and
8 Ld or 16 Ld SOIC outlines.
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.
Pin Descriptions
8 LD SOIC,
MSOP 10 LD MSOP PIN NAME FUNCTION EQUIVALENT CIRCUIT
1 9 OUTA Output, channel A
Circuit 1
2 10 INA- Inverting input, channel A
Circuit 2
3 1 INA+ Non-inverting input, channel A (see circuit 2)
2CEAChip enable, channel A
Circuit 3
4 3 VS- Negative supply
4CEBChip enable, channel B (see circuit 3)
5 5 INB+ Non-inverting input, channel B (see circuit 2)
6 6 INB- Inverting input, channel B (see circuit 2)
7 7 OUTB Output, channel B (see circuit 1)
8 8 VS+ Positive supply
V
S
+
V
S
-
OUT
IN-IN+
V
S
+
V
S
-
V
S
+
V
S
-
CE
EL5293, EL5293A
