DATASHEET
HFA1112
FN2992
Rev 8.00
July 27, 2005
850MHz, Low Distortion Programmable Gain Buffer Amplifiers
The HFA1112 is a closed loop Buffer featuring user
programmable gain and ultra high speed performance.
Manufactured on Intersil’s proprietary complementary
bipolar UHF-1 process, these devices offer a wide -3dB
bandwidth of 850MHz, very fast slew rate, excellent gain
flatness, low distortion and high output current.
Features
A unique feature of the pinout allows the user to select a
voltage gain of +1, -1, or +2, without the use of any external
components. Gain selection is accomplished via
connections to the inputs, as described in the “Application
Information” section. The result is a more flexible product,
fewer part types in inventory, and more efficient use of board
space.
• Fast Settling Time (0.1%). . . . . . . . . . . . . . . . . . . . . . 11ns
Compatibility with existing op amp pinouts provides flexibility
to upgrade low gain amplifiers, while decreasing component
count. Unlike most buffers, the standard pinout provides an
upgrade path should a higher closed loop gain be needed at
a future date.
• User Programmable for Closed-Loop Gains of +1, -1 or +2
without Use of External Resistors
• Wide -3dB Bandwidth. . . . . . . . . . . . . . . . . . . . . . 850MHz
• Very Fast Slew Rate. . . . . . . . . . . . . . . . . . . . . . 2400V/s
• High Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 60mA
• Excellent Gain Accuracy . . . . . . . . . . . . . . . . . . . 0.99V/V
• Overdrive Recovery . . . . . . . . . . . . . . . . . . . . . . . .
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