The MAX4178/MAX4278 are ±5V, wide-bandwidth, fast-settling, closed-loop buffers featuring high slew rate, high precision, high output current, low noise, and low differential gain and phase errors. The MAX4178, with a -3dB bandwidth of 330MHz, is preset for unity voltage gain (0dB). The MAX4278 is preset for a voltage gain of +2 (6dB) and has a 310MHz -3dB bandwidth. The MAX4178/MAX4278 feature the high slew rate and low power that are characteristic of current-mode feedback amplifiers. However, unlike conventional current-mode feedback amplifiers, these devices have a unique input stage that combines the benefits of cur- rent-feedback topology with those of the traditional volt- age-feedback topology. This combination results in low input offset voltage and bias current, low noise, and high gain precision and power-supply rejection. The MAX4178/MAX4278 are ideally suited for driving 50Ω or 75Ω loads. They are the perfect choice for high-speed cable-driving applications, such as video routing. The MAX4178/MAX4278 are available in DIP, SO, and space-saving µMAX and SOT23 packages.
The MAX4178 and MAX4278 are +5 V, wide‑bandwidth, fast‑settling closed‑loop buffers featuring high slew rate, high precision, high output current, low noise, and low differential gain and phase errors. The MAX4178 is preset for unity voltage gain (0 dB) with a 330 MHz -3 dB bandwidth, while the MAX4278 provides a gain of +2 (6 dB) and a 310 MHz -3 dB bandwidth.
These devices are intended for high‑speed cable‑driving applications such as video routing, broadcast and HD‑TV systems, and precision high‑speed DAC/ADC buffers. They are available in DIP, SO, and space‑saving UMAX and SOT‑23 packages, and can drive capacitive loads up to 100 pF without oscillation when proper PCB layout techniques are used.
| MAX4178 Bandwidth (-3 dB) | 330 MHz |
|---|---|
| MAX4278 Bandwidth (-3 dB) | 310 MHz |
| MAX4178 Slew Rate | 1300 V/µs |
| MAX4278 Slew Rate | 1600 V/µs |
| Input Offset Voltage | 0.5 mV |
| Input Bias Current | 1 pA |
| Supply Current | 8 mA |
| ESD Protection | 8000 V |
The MAX4178 is preset for unity voltage gain (0 dB).
The output current is typically limited to 150 mA under short‑circuit conditions.