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.
The HFA1112 is a closed‑loop buffer featuring user‑programmable gain (+1, –1, or +2) without external components. It is built on Intersil’s proprietary complementary bipolar UHF‑1 process, delivering a wide –3 dB bandwidth of 850 MHz, very fast slew rate, low distortion, and high output current.
Typical applications include RF/IF processing, high‑speed communications, video switching, radar, and medical imaging. Proper PCB layout, decoupling, and termination are recommended to maintain performance, especially when driving capacitive loads. An evaluation board (HFA11XXEVAL) is provided for testing and development.
| -3dB Bandwidth | 850 MHz |
|---|---|
| Slew Rate | 2400 V/µs |
| Output Current | 60 mA |
| Gain Accuracy | 0.99 V/V |
| Supply Voltage Range | +4.5 V to 45.5 V |
| Operating Temperature Range | -40 °C to 85 °C |
| Maximum Junction Temperature | 150 °C |
The device can be configured for gains of –1, +1, or +2 by connecting the input pins as described in the gain selection table.
The HFA1112 can source up to 60 mA of output current.
The amplifier provides a –3 dB bandwidth of 850 MHz.
The part is offered in PDIP and SOIC surface‑mount packages.