Overview
The THS3491IRGTR, produced by Texas Instruments, is a high-performance current feedback amplifier (CFA) designed for applications requiring low distortion at high output power levels. This amplifier operates from either a single supply or dual supplies, offering a wide range of voltage supply options from 14 V to 32 V for single supply and ±7 V to ±16 V for dual supplies. It is particularly suited for high-frequency applications, delivering a small-signal bandwidth of 900 MHz and a slew rate of 8000 V/µs. The THS3491IRGTR is available in VQFN-16 (RGT) and 8-pin HSOIC (DDA) packages, making it versatile for both new and existing design upgrades.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Bandwidth (VO = 2 VPP, AV = 5 V/V) | 900 | MHz |
| Bandwidth (VO = 10 VPP, AV = 5 V/V) | 320 | MHz |
| Slew Rate (VO = 20 VPP) | 8000 | V/µs |
| Input Voltage Noise | 1.7 | nV/√Hz |
| Supply Voltage Range (Single Supply) | 14 to 32 | V |
| Supply Voltage Range (Dual Supplies) | ±7 to ±16 | V |
| Output Swing (±16-V supplies, 100-Ω load) | 28 | VPP |
| Linear Output Current (typical) | ±420 | mA |
| Supply Current (typical) | 16.8 | mA |
| Harmonic Distortion (HD2 and HD3 at 50 MHz, VO = 10 VPP, 100-Ω load) | < -75 | dBc |
| Rise and Fall Time (10-V step) | 1.3 | ns |
| Overshoot (10-V step, AV = 5 V/V) | 1.5% |
Key Features
- High bandwidth and slew rate, enabling low distortion at high output power levels.
- Wide supply voltage range: single supply from 14 V to 32 V and dual supplies from ±7 V to ±16 V.
- High linear output current of ±420 mA, suitable for driving heavy capacitive loads.
- Low harmonic distortion (HD2 and HD3 less than –75 dBc at 50 MHz).
- Fast rise and fall times of less than 1.3 ns.
- Low overshoot of less than 1.5% for a 10-V step.
- Current limit and thermal shutdown protection for reliability.
- Power down feature for power management.
Applications
- High-voltage, arbitrary waveform generators.
- Pattern generators for LCD testers.
- Output drivers for LCR meters.
- Power FET drivers.
- High capacitive load piezo element drivers.
- VDSL line drivers.
- Pin-compatible upgrade to THS3095 (DDA).
Q & A
- What is the bandwidth of the THS3491IRGTR at a 2 VPP output?
The bandwidth of the THS3491IRGTR at a 2 VPP output is 900 MHz. - What is the slew rate of the THS3491IRGTR?
The slew rate of the THS3491IRGTR is 8000 V/µs. - What is the input voltage noise of the THS3491IRGTR?
The input voltage noise of the THS3491IRGTR is 1.7 nV/√Hz. - What are the supply voltage ranges for the THS3491IRGTR?
The THS3491IRGTR can operate from a single supply of 14 V to 32 V or dual supplies from ±7 V to ±16 V. - What is the typical linear output current of the THS3491IRGTR?
The typical linear output current of the THS3491IRGTR is ±420 mA. - What are the harmonic distortion levels for the THS3491IRGTR at 50 MHz?
The harmonic distortion levels (HD2 and HD3) at 50 MHz are less than –75 dBc. - What are the rise and fall times of the THS3491IRGTR for a 10-V step?
The rise and fall times of the THS3491IRGTR for a 10-V step are less than 1.3 ns. - Does the THS3491IRGTR have any protection features?
Yes, the THS3491IRGTR includes current limit and thermal shutdown protection. - What are some common applications of the THS3491IRGTR?
Common applications include high-voltage, arbitrary waveform generators, pattern generators for LCD testers, output drivers for LCR meters, power FET drivers, and VDSL line drivers. - Is the THS3491IRGTR pin-compatible with other models?
Yes, the THS3491IRGTR is pin-compatible with the THS3095 (DDA).
