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運算放大器 (op amps)
高速運算放大器 (GBW ≥ 50 MHz)

THS3491

現行

900-MHz 高功率輸出電流回饋放大器

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產品規格表

THS3491

現行
產品規格表 立即訂購

產品詳細資料

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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類型 標題 日期
* Data sheet THS3491 900-MHz, 500-mA High-Power Output Current Feedback Amplifier datasheet (Rev. C) PDF | HTML 2023年 2月 22日
Technical article 3 common questions when designing with high-speed amplifiers PDF | HTML 2020年 7月 17日
Technical article How to reduce distortion in high-voltage, high-frequency signal generation for AWG PDF | HTML 2018年 10月 30日
EVM User's guide THS3491RGT EVM User's Guide 2017年 8月 9日
EVM User's guide THS3491DDA EVM User's Guide 2017年 8月 8日
Application note Load Sharing Concepts: Implementation for Large-Signal Applications 2011年 10月 5日
Application note Noise Analysis for High Speed Op Amps (Rev. A) 2005年 1月 17日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

THS3491DDAEVM — THS3491 評估模組，適合採用 DDA 封裝的 900-V MHz 高功率輸出電流回饋放大器

THS3491DDA 評估模組 (EVM) 可評估採用 8 接腳 DDA 封裝高速、高電壓和低失真電流回饋放大器的 THS3491。EVM 的目的在輕鬆快速地展示 THS3491 在 5 V/V 增益下驅動等效 RLOAD =100 Ω 的功能和性能。EVM 隨時可透過板載連接器來連接電源、訊號源和測試儀器。電路板設置爲單端輸入和輸出操作，以與 50-Ω 測試設備介接。

使用指南: PDF
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開發板

THS3491RGTEVM — THS3491 評估模組，適合採用 RGT 封裝的 900-V MHz 高功率輸出電流回饋放大器

THS3491RGT 評估模組 (EVM) 可評估採用 16 接腳 RGT 封裝高速、高電壓和低失真電流回饋放大器的 THS3491。EVM 的目的在輕鬆快速地展示 THS3491 在 5 V/V 增益下驅動等效 RLOAD =100 Ω 的功能和性能。EVM 隨時可透過板載連接器來連接電源、訊號源和測試儀器。電路板設置爲單端輸入和輸出操作，以與 50-Ω 測試設備介接。

使用指南: PDF
TI.com 無法提供
模擬型號

THS3491 PSpice Model

SBOMBP9.ZIP (150 KB) - PSpice Model
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模擬型號

THS3491DDA TINA-TI Reference Design (Rev. A)

SBOMAI4A.TSC (1189 KB) - TINA-TI Reference Design
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模擬型號

THS3491DDA TINA-TI Spice Model (Rev. A)

SBOMAI5A.ZIP (11 KB) - TINA-TI Spice Model
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模擬型號

THS3491RGT TINA-TI Reference Design

SBOMAN3.TSC (344 KB) - TINA-TI Reference Design
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模擬型號

THS3491RGT TINA-TI Spice Model

SBOMAN4.ZIP (11 KB) - TINA-TI Spice Model
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計算工具

ANALOG-ENGINEER-CALC — 類比工程師計算機

The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
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計算工具

VOLT-DIVIDER-CALC — Voltage divider calculation tool

The voltage divider calculation tool (VOLT-DIVIDER-CALC) quickly determines a set of resistors for a voltage divider. This KnowledgeBase JavaScript utility can be used to find a set of resistors for a voltage divider to achieve the desired output voltage. VOLT-DIVIDER-CALC can also be used to (...)
立即進行設計
模擬工具

PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
要求
模擬工具

TINA-TI — 基於 SPICE 的類比模擬程式

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
使用指南: PDF
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參考設計

TIDA-060033 — 靴帶式高輸出電壓延伸參考設計

此參考設計使用三個 THS3491 高速、高電壓電流回饋放大器，可提供 1 MHz 的 50-Vpp 輸出正弦電壓擺幅，同時在 20-Vpp 輸出時維持 100 MHz 的大訊號頻寬 (BW)。高輸出電壓擺幅得自稱為開機的技術，針對輸出調變放大器電源供應電壓。此技術可有效延長放大器的可用電源供應範圍，同時可時時維持建議的運作條件。
Design guide: PDF
參考設計

TIDA-060002 — 適合高電容負載應用的 100-MHz、1 A 輸出電流驅動器參考設計

This reference design uses the THS3491 high-speed, high-voltage current feedback amplifier to demonstrate an output current drive capability of greater than 1 A into a low-resistive or high-capacitive load while maintaining a large signal bandwidth of 100 MHz at 20 VPP. The high output (...)
Design guide: PDF
電路圖: PDF
封裝 針腳 CAD 符號、佔位空間與 3D 模型
DIESALE (Y) —
HSOIC (DDA) 8 Ultra Librarian
VQFN (RGT) 16 Ultra Librarian
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