HFA1112: 850MHz, Low Distortion Programmable Gain Buffer Amplifier

The HFA1112/12A are closed loop Buffers 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. The HFA1112A is a more stable version optimized for unity gain applications.

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.

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.

This amplifier is available with programmable output limiting as the HFA1113. For applications requiring a standard buffer pinout, please refer to the HFA1110 data sheet.

Key Features
  • 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/µs
  • Fast Settling Time (0.1%) 11ns
  • High Output Current 60mA
  • Excellent Gain Accuracy 0.99V/V
  • Overdrive Recovery <10ns
  • Standard Operational Amplifier Pinout
  • Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
  • RF/IF Processors
  • Driving Flash A/D Converters
  • High-Speed Communications
  • Impedance Transformation
  • Line Driving
  • Video Switching and Routing
  • Radar Systems
  • Medical Imaging Systems
  • Related Literature
    • AN9507, Video Cable Drivers Save Board Space
Typical Diagram
Application Notes
TitleTypeUpdatedSizeOther Languages
AN9787: An Intuitive Approach To Understanding Current Feedback AmplifiersPDF13 Nov 2014154 KB
AN9757: A Cookbook Approach to Single Supply DC-Coupled Op Amp DesignPDF13 Nov 201476 KB
AN9663: Converting From Voltage-Feedback to Current-Feedback AmplifiersPDF13 Nov 2014187 KB
AN9507: Video Cable Drivers Save Board Space, Increase BandwidthPDF13 Nov 2014124 KB
AN9420: Current Feedback Amplifier Theory and ApplicationsPDF13 Nov 201483 KB
Datasheets
TitleTypeUpdatedSizeOther Languages
HFA1112 DatasheetPDF14 Nov 2014478 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
HFA1112AIB968 Ld SOIC T+R0.0728240
HFA1112AIP8 Ld PDIP0.548N/ANA
HFA1112IB8 Ld SOIC0.0728240
HFA1112IB968 Ld SOIC T+R0.0728240
HFA1112IBZ8 Ld SOIC0.07283260RoHS
HFA1112IBZ968 Ld SOIC T+R0.07283260RoHS
HFA1112IP8 Ld PDIP0.548N/ANA
HFA1112IPZ8 Ld PDIP0.548N/ANARoHS
HFA11XXEVALN/A
HFA1112 Datasheet 14 Nov 2014
8 Ld SOIC T+R ISL84514
8 Ld PDIP ISL84542
HFA1112
AN9787: An Intuitive Approach To Understanding Current Feedback Amplifiers 13 Nov 2014
AN9757: A Cookbook Approach to Single Supply DC-Coupled Op Amp Design 13 Nov 2014
AN9663: Converting From Voltage-Feedback to Current-Feedback Amplifiers 13 Nov 2014
AN9507: Video Cable Drivers Save Board Space, Increase Bandwidth 13 Nov 2014
AN9420: Current Feedback Amplifier Theory and Applications 13 Nov 2014