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High-speed op amps (GBW ≥ 50 MHz)

THS3491

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900-MHz high-power-output current-feedback amplifier

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Data sheet

THS3491

ACTIVE
Data sheet Order now

Product details

Architecture Current FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 14 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 32 GBW (typ) (MHz) 900 BW at Acl (MHz) 900 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 8000 Vn at flatband (typ) (nV√Hz) 1.85 Vn at 1 kHz (typ) (nV√Hz) 3 Iq per channel (typ) (mA) 17.1 Vos (offset voltage at 25°C) (max) (mV) 2 Rail-to-rail No Features Shutdown Rating Catalog Operating temperature range (°C) -40 to 85 CMRR (typ) (dB) 75 Input bias current (max) (pA) 5000000 Offset drift (typ) (µV/°C) 3 Iout (typ) (mA) 420 2nd harmonic (dBc) 76 3rd harmonic (dBc) 69 Frequency of harmonic distortion measurement (MHz) 50
Architecture Current FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 14 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 32 GBW (typ) (MHz) 900 BW at Acl (MHz) 900 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 8000 Vn at flatband (typ) (nV√Hz) 1.85 Vn at 1 kHz (typ) (nV√Hz) 3 Iq per channel (typ) (mA) 17.1 Vos (offset voltage at 25°C) (max) (mV) 2 Rail-to-rail No Features Shutdown Rating Catalog Operating temperature range (°C) -40 to 85 CMRR (typ) (dB) 75 Input bias current (max) (pA) 5000000 Offset drift (typ) (µV/°C) 3 Iout (typ) (mA) 420 2nd harmonic (dBc) 76 3rd harmonic (dBc) 69 Frequency of harmonic distortion measurement (MHz) 50
DIESALE (Y) — See data sheet HSOIC (DDA) 8 29.4 mm² 4.9 x 6 VQFN (RGT) 16 9 mm² 3 x 3
  • Bandwidth:
    • 900 MHz (VO = 2 VPP, AV = 5 V/V)
    • 320 MHz (VO = 10 VPP, AV = 5 V/V)
  • Slew rate: 8000 V/µs (VO = 20 VPP)
  • Input voltage noise: 1.7 nV/√ Hz
  • Bipolar supply range: ±7 V to ±16 V
  • Single-supply range: 14 V to 32 V
  • Output swing: 28 VPP (±16-V supplies, 100-Ω load)
  • Linear output current: ±420 mA (typical)
  • 16.8-mA trimmed supply current (low temperature coefficient)
  • HD2 and HD3: less than –75 dBc (50 MHz, VO = 10 VPP, 100-Ω load)
  • Rise and fall time: 1.3 ns (10-V step)
  • Overshoot: 1.5% (10-V step, AV = 5 V/V)
  • Current limit and thermal shutdown protection
  • Power down feature
  • Bandwidth:
    • 900 MHz (VO = 2 VPP, AV = 5 V/V)
    • 320 MHz (VO = 10 VPP, AV = 5 V/V)
  • Slew rate: 8000 V/µs (VO = 20 VPP)
  • Input voltage noise: 1.7 nV/√ Hz
  • Bipolar supply range: ±7 V to ±16 V
  • Single-supply range: 14 V to 32 V
  • Output swing: 28 VPP (±16-V supplies, 100-Ω load)
  • Linear output current: ±420 mA (typical)
  • 16.8-mA trimmed supply current (low temperature coefficient)
  • HD2 and HD3: less than –75 dBc (50 MHz, VO = 10 VPP, 100-Ω load)
  • Rise and fall time: 1.3 ns (10-V step)
  • Overshoot: 1.5% (10-V step, AV = 5 V/V)
  • Current limit and thermal shutdown protection
  • Power down feature

The THS3491 current feedback amplifier (CFA) provides a new level of performance for applications requiring the lowest distortion at high output power levels from DC through values greater than 100 MHz at 100-Ω loads. Although specified at a gain of 5 V/V, this current feedback design holds near constant bandwidth and distortion over a wide range of gains.

The 8000 V/µs of slew rate delivers an output of 10 VPP into demanding loads with low distortion through 100 MHz. The 900-MHz, small-signal bandwidth delivers a low overshoot of less than 1.5% for a 10-V step, and rise and fall times of less than 1.3 ns. Peak output current drive values greater than 500 mA enable driving heavy capacitive loads with fast signals.

New designs benefit from the lowest distortion using the VQFN-16 (RGT) package, whereas the 8-pin HSOIC (DDA) package (with PowerPAD™) upgrades existing THS3091 or THS3095 designs. Lower output headroom for the THS3491 provides more output swing on the same ±15-V supplies versus legacy THS3091 or THS3095 options.

The THS3491 current feedback amplifier (CFA) provides a new level of performance for applications requiring the lowest distortion at high output power levels from DC through values greater than 100 MHz at 100-Ω loads. Although specified at a gain of 5 V/V, this current feedback design holds near constant bandwidth and distortion over a wide range of gains.

The 8000 V/µs of slew rate delivers an output of 10 VPP into demanding loads with low distortion through 100 MHz. The 900-MHz, small-signal bandwidth delivers a low overshoot of less than 1.5% for a 10-V step, and rise and fall times of less than 1.3 ns. Peak output current drive values greater than 500 mA enable driving heavy capacitive loads with fast signals.

New designs benefit from the lowest distortion using the VQFN-16 (RGT) package, whereas the 8-pin HSOIC (DDA) package (with PowerPAD™) upgrades existing THS3091 or THS3095 designs. Lower output headroom for the THS3491 provides more output swing on the same ±15-V supplies versus legacy THS3091 or THS3095 options.
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Type Title Date
* Data sheet THS3491 900-MHz, 500-mA High-Power Output Current Feedback Amplifier datasheet (Rev. C) PDF | HTML 22 Feb 2023
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
Technical article 3 common questions when designing with high-speed amplifiers PDF | HTML 17 Jul 2020
Technical article How to reduce distortion in high-voltage, high-frequency signal generation for AWG PDF | HTML 30 Oct 2018
EVM User's guide THS3491RGT EVM User's Guide 09 Aug 2017
EVM User's guide THS3491DDA EVM User's Guide 08 Aug 2017
Application note Load Sharing Concepts: Implementation for Large-Signal Applications 05 Oct 2011
Application note Noise Analysis for High Speed Op Amps (Rev. A) 17 Jan 2005

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