The THS4631 is a high-speed, FET-input operational amplifier designed for applications requiring wideband operation, high-input impedance, and high-power supply voltages. By providing a 210-MHz gain bandwidth product, ±15-V supply operation, and 100-pA input bias current, the THS4631 is capable of simultaneous wideband transimpedance gain and large output signal swing. The fast 1000 V/µs slew rate allows for fast settling times and good harmonic distortion at high frequencies. Low current and voltage noise allow amplification of extremely low-level input signals while still maintaining a large signal-to-noise ratio.
The characteristics of the THS4631 make it ideally suited for use as a wideband photodiode amplifier. Photodiode output current is a prime candidate for transimpedance amplification as shown below. Other potential applications include test and measurement systems requiring high-input impedance, ADC and DAC buffering, high-speed integration, and active filtering.
The THS4631 is offered in an 8-pin SOIC (D), and the 8-pin SOIC (DDA) and MSOP (DGN) with PowerPAD™ package.
| Architecture | FET / CMOS Input, Voltage FB |
| Number of channels | 1 |
| Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) | 10 |
| Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) | 32 |
| GBW (typ) (MHz) | 210 |
| BW at Acl (MHz) | 325 |
| Acl, min spec gain (V/V) | 1 |
| Slew rate (typ) (V/µs) | 1000 |
| Vn at flatband (typ) (nV√Hz) | 7 |
| Vn at 1 kHz (typ) (nV√Hz) | 7 |
| Iq per channel (typ) (mA) | 11.5 |
| Vos (offset voltage at 25°C) (max) (mV) | 0.5 |
| Rail-to-rail | No |
| Rating | Catalog |
| Operating temperature range (°C) | -40 to 85 |
| CMRR (typ) (dB) | 95 |
| Input bias current (max) (pA) | 100 |
| Offset drift (typ) (µV/°C) | 2.5 |
| Iout (typ) (mA) | 95 |
| 2nd harmonic (dBc) | 76 |
| 3rd harmonic (dBc) | 94 |
| Frequency of harmonic distortion measurement (MHz) | 5 |
| HSOIC (DDA) | 8 | 29.4 mm² 4.9 x 6 |
| HVSSOP (DGN) | 8 | 14.7 mm² 3 x 4.9 |
| SOIC (D) | 8 | 29.4 mm² 4.9 x 6 |
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