THS3491IRGTT

The THS3491 current feedback amplifier (CFA) delivers superior performance for applications requiring minimal distortion at high output power levels from DC to greater than 100MHz (with a 100Ω load). Although this current feedback design is rated for a gain of 5V/V, it maintains nearly constant bandwidth and distortion across a wide gain range. An 8000V/μs slew rate enables 10VPP output into demanding loads at low distortion and 100MHz. The 900MHz small-signal bandwidth delivers less than 1.5% overshoot with a 10V step and rise/fall times of less than 1.3ns. A peak output current drive of greater than 500mA enables fast signal driving of high-capacitive loads. By using the VQFN-16 (RGT) package, new designs benefit from the lowest distortion, while the 8-pin HSOIC (DDA) package with PowerPAD provides a drop-in upgrade path for existing THS3091 or THS3095 designs. Compared to the conventional THS3091 or THS3095 options, the THS3491's lower output headroom delivers a larger output swing from the same ±15V supply.

Applications

• High-voltage arbitrary waveform generator
• Signal generator for LCD testers
• Output driver for LCR meters
• Power FET driver
• High-capacitive-load piezoelectric element driver
• VDSL line driver
• Pin-compatible upgrade for THS3095 (DDA)

Key features

• Bandwidth: 900MHz (ΔVO = 2VP-P, AV = 5V/V); 320MHz (ΔVO = 10VP-P, AV = 5V/V)
• Slew Rate: 8000V/μs (V0 = 20VP-P)
• Input Voltage Noise: 1.7nV/√Hz
• Dual Supply Range: ±7V to ±16V
• Single Supply Range: 14V to 32V
• Output Swing: 28VP-P (±16V supply, 100Ω load)
• Linear Output Current: ±420mA (typical)
• 16.8mA trimmed supply current (low temperature coefficient)
• HD2 and HD3: less than –75dBc (50MHz, V0 = 10VP-P, 100Ω load)
• Rise and Fall Time: 1.3ns (10V step)
• Overshoot: 1.5% (10V step, AV = 5V/V)
• Current limiting and thermal shutdown protection
• Power-down feature