HFA1115_04

TM CT RODU T LETE P TE PRODUC OBSO TITU S E SUB 13 DataL HF POSSIB Sheets A11 HFA1115 July 2004 FN3606.5 225MHz, Low Power, Output Limiting, Closed Loop Buffer Amplifier The HFA1115 is a high speed closed loop Buffer featuring both user programmable gain and output limiting. Manufactured on Intersil’s proprietary complementary bipolar UHF-1 process, the HFA1115 also offers a wide -3dB bandwidth of 225MHz, very fast slew rate, excellent gain flatness and high output current. This buffer is the ideal choice for high frequency applications requiring output limiting, especially those needing ultra fast overload recovery times. The limiting function allows the designer to set the maximum positive and negative output levels, thereby protecting later stages from damage or input saturation. The HFA1115 also allows for voltage gains of +2, +1, and -1, without the use of external resistors. Gain selection is accomplished via connections to the inputs, as described in the “Application Information” text. 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. For Military product, refer to the HFA1115/883 data sheet. Features • User Programmable Output Voltage Limiting • High Input Impedance . . . . . . . . . . . . . . . . . . . . . . . 1MΩ • Differential Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02% • Differential Phase. . . . . . . . . . . . . . . . . . . . . 0.03 Degrees • Wide -3dB Bandwidth (AV = +2) . . . . . . . . . . . . . 225MHz • Very Fast Slew Rate (AV = -1) . . . . . . . . . . . . . . 1135V/μs • Low Supply Current . . . . . . . . . . . . . . . . . . . . . . . . 7.1mA • High Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 60mA • Excellent Gain Accuracy . . . . . . . . . . . . . . . . . . . 0.99V/V • User Programmable For Closed-Loop Gains of +1, -1 or +2 Without Use of External Resistors • Fast Overdrive Recovery . . . . . . . . . . . . . . . . . . . . .