HFA1412
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1-888-IN
Quad, 350MHz, Low Power,
Programmable Gain Buffer Amplifier
FN4152.4
Features
The HFA1412 is a quad closed loop Buffer featuring user
programmable gain and high speed video performance.
A unique feature of the HFA1412’s pinout allows the user to
select a voltage gain of +1, -1, or +2 (see the “Application
Information” section). The on-chip gain setting resistors
eliminate eight external resistors, thus saving board space or
freeing up space for termination resistors. The on-chip
feedback resistor is preset at the optimum value, and also
eliminates worries about parasitic feedback capacitance.
Additionally, the capacitance sensitive summing node is
buried inside the package where it is unaffected by PCB
parasitics. 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.
The HFA1412 is an excellent choice for component and
composite video systems as indicated by the excellent gain
flatness, and 0.03%/0.02 Degree Differential Gain/Phase
specifications (RL = 150). Its ability to deliver a gain of +2
with no external resistors makes it particularly desirable for
applications driving double terminated cables.
• User Programmable For Closed-Loop Gains of +1, -1 or
+2 Without Use of External Resistors
• Wide -3dB Bandwidth. . . . . . . . . . . . . . . . . . . . . . 350MHz
• Low Supply Current . . . . . . . . . . . . . . . . . . . . 6mA/Buffer
• Excellent Gain Flatness (to 100MHz). . . . . . . . . . 0.08dB
• Low Differential Gain and Phase . . . . 0.03%/0.02 Degree
• Very Fast Slew Rate . . . . . . . . . . . . . . . . . . . . . 1650V/s
• Fast Settling Time (0.1%). . . . . . . . . . . . . . . . . . . . . 28ns
• High Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 55mA
• Excellent Gain Accuracy . . . . . . . . . . . . . . . . . . . 0.99V/V
• Overdrive Recovery . . . . . . . . . . . . . . . . . . . . . . . .
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