EL5166 Intersil Corporation, EL5166 Datasheet - Page 6

• Manufacturer Part Number: EL5166
• Description: 1.4GHz Current Feedback Amplifiers with Enable
• Manufacturer: Intersil Corporation

Pin Descriptions
Applications Information
Product Description
The EL5166 and EL5167 are current-feedback operational
amplifiers that offers a wide -3dB bandwidth of 1.4GHz and a
low supply current of 8.5mA per amplifier. The EL5166 and
EL5167 work 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 EL5166 and EL5167 do not have the
normal gain-bandwidth product associated with voltage-
feedback operational amplifiers. Instead, their -3dB
bandwidth remains relatively constant as closed-loop gain is
increased. This combination of high bandwidth and low
power, together with aggressive pricing make the EL5166
and EL5167 ideal choices for many low-power/high-
bandwidth applications such as portable, handheld, or
battery-powered equipment.
8-PIN SO
1, 5
2
3
4
6
7
8
6-PIN SOT-23
4
3
2
1
6
5
6
5-PIN SOT-23
4
3
2
1
5
NAME
OUT
VS+
PIN
VS-
IN+
NC
CE
IN-
EL5166, EL5167
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
(See circuit 1)
IN+
CE
EQUIVALENT CIRCUIT
CIRCUIT 1
CIRCUIT 2
CIRCUIT 3
V
OUT
V
S
S
+
-
V
V
V
V
S
IN-
S
S
S
+
-
+
-