HFA11XXEVAL Intersil, HFA11XXEVAL Datasheet - Page 5

• Manufacturer Part Number: HFA11XXEVAL
• Description: EVALUATION PLATFORM HFA11XX
• Manufacturer: Intersil

Specifications of HFA11XXEVAL

• Channels Per Ic: 1 - Single
• Amplifier Type: General Purpose
• Board Type: Partially Populated
• Utilized Ic / Part: 8-DIP Package
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Operating Temperature: -
• Output Type: -
• Current - Output / Channel: -
• Voltage - Supply, Single/dual (±): -
• -3db Bandwidth: -
• Slew Rate: -
• Current - Supply (main Ic): -

PC Board Layout
The frequency response of this amplifier depends greatly on
the amount of care taken in designing the PC board. The
use of low inductance components such as chip
resistors and chip capacitors is strongly recommended,
while a solid ground plane is a must!
Attention should be given to decoupling the power supplies.
A large value (10μF) tantalum in parallel with a small value
chip (0.1μF) capacitor works well in most cases.
Terminated microstrip signal lines are recommended at the
input and output of the device. Output capacitance, such as
that resulting from an improperly terminated transmission
line, will degrade the frequency response of the amplifier
and may cause oscillations. In most cases, the oscillation
can be avoided by placing a resistor in series with the
output.
Care must also be taken to minimize the capacitance to ground
seen by the amplifier’s inverting input. The larger this
capacitance, the worse the gain peaking, resulting in pulse
overshoot and eventual instability. To reduce this capacitance,
remove the ground plane under traces connected to -IN and
keep these traces as short as possible.
Examples of good high frequency layouts are the evaluation
boards shown below.
FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs
50
40
30
20
10
0
0
SOIC
50
LOAD CAPACITANCE
SOT-23
100
LOAD CAPACITANCE (pF)
150
5
200
250
300
350
A
V
= +2
400
HFA1150
Evaluation Boards
The performance of the HFA1150IB (SOIC) may be
evaluated using the HFA11XX Evaluation Board and a SOIC
to DIP adaptor like the Aries Electronics Part Number
08-350000-10. The SOT-23 version can be evaluated using
the OPAMPSOT23EVAL board.
To order evaluation boards (part number HFA11XXEVAL or
OPAMPSOT23EVAL), please contact your local sales office.
The schematic and layout of the HFA11XXEVAL and
OPAMPSOT23EVAL boards are shown below.
IN
511Ω
50Ω
FIGURE 2. HFA11XXEVAL SCHEMATIC
HFA11XXEVAL BOTTOM LAYOUT
HFA11XXEVAL TOP LAYOUT
+IN
-5V
1
2
3
4
511Ω
1
V
H
V
L
GND
8
7
6
5
V-
GND
50Ω
V+
NC
0.1μF
GND
OUT
NC
+5V
10μF