THS4031 - 100MHz 1.6nV Low-Noise Op Amp | Texas Instruments
料号： THS4031 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.45 | $245.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.85 | $1,850.00 |
THS4031 概述
A voltage feedback amplifier is a type of operational amplifier that uses voltage feedback to set closed-loop gain, offering high bandwidth and low distortion. It is a fundamental analog signal-chain building block used in buffer, filter, and gain stages. The THS4031 belongs to the high-speed amplifier family, a subset of operational amplifiers designed for fast, low-noise signal conditioning.
Key features include ultra-low 1.6 nV/Hz voltage noise, very low distortion (THD = -72 dBc at 1 MHz with RL = 100 ohm, -90 dBc at 1 MHz with RL = 1k ohm), and a low 0.5-mV typical input offset voltage. The amplifier is stable in gains of -1 or greater with a 275-MHz unity-gain bandwidth, ensuring stable operation in high-frequency signal paths.
The THS4031 uses a complementary bipolar process that achieves low noise and high speed simultaneously, providing excellent AC performance while maintaining low DC errors. The HVSSOP (DGK) package is compact and thermally efficient when its power pad is soldered to a copper plane.
Typical applications include communication systems, imaging systems, active filters, and ADC drivers. In communication receivers, the 1.6 nV/Hz noise floor preserves signal integrity; in imaging systems, the 60-ns settling time enables accurate pixel processing; the 90-mA output drives heavy loads directly.
Design tip: decouple supplies with 0.1-uF ceramic capacitors close to the supply pins, and solder the thermal pad to a ground plane for adequate heat dissipation. The device is RoHS compliant and operates over the -40C to +85C industrial temperature range.
直接替换替代料： THS4031 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： THS4031 （相同外形与封装尺寸） ——差异在于 Package, THD, Amplifier Type, Bandwidth, Settling Time (0.1%).
快速对比工具——选择替代料号进行并排对比：
THS4031Q-Q1
✅ 直接替换✓ 有现货
$1.63 / 个
查看数据手册 →THS4031CDGNR
✅ 直接替换✓ 有现货
$1.62 / 个
查看数据手册 →THS4031ID
✅ 直接替换📋 参考替代料（不在目录中）
THS4032IDGNR
✅ 直接替换📋 参考替代料（不在目录中）
THS4011CDGNR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
THS4031 最大额定值与电气特性
| Amplifier Type | Voltage Feedback |
| Number of Channels | 1 |
| Bandwidth | 100 MHz (G=2) |
| Unity-Gain Bandwidth | 275 MHz |
| Slew Rate | 100 V/us |
| Settling Time (0.1%) | 60 ns |
| Voltage Noise | 1.6 nV/Hz |
| Input Offset Voltage | 0.5 mV (typ) |
| THD | -72 dBc at 1 MHz, RL = 100 ohm; -90 dBc at 1 MHz, RL = 1k ohm |
| Output Current | 90 mA |
| 电源电流 | 8.5 mA per channel |
| Supply Voltage Range | +/-5 V to +/-15 V |
| Stability | Stable in gains of -1 V/V or greater |
| 工作温度 | -40C to +85C |
| 封装 | 8-HVSSOP (DGK) with power pad |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
THS4031 引脚配置
| 引脚 1 | OUT — Amplifier output |
| 引脚 2 | -IN — Inverting input |
| 引脚 3 | +IN — Non-inverting input |
| 引脚 4 | V- — Negative supply |
| 引脚 5 | NC — No connection |
| 引脚 6 | NC — No connection |
| 引脚 7 | V+ — Positive supply |
| 引脚 8 | NC — No connection |
| 引脚 PAD | PowerPAD — Thermal pad - solder to ground plane for heat dissipation |
典型应用
THS4031 适用于 6 应用s: Communications Systems, Imaging Systems, ADC Driver Stage, Active Filters, Test and Measurement Instrumentation, Video and Imaging Buffer.
Communications Systems
In communications receivers and IF/RF signal chains, the THS4031's 1.6 nV/Hz voltage noise preserves SNR for weak signals, while its 100-MHz bandwidth covers wideband IF stages. The amplifier is placed in gain-of-2 or inverting gain stages between mixers and ADCs, with the 100-V/us slew rate handling large-swing modulated carriers without slew-induced distortion. Its 90-mA output drive feeds 50-ohm back-terminated lines directly, eliminating an extra buffer stage and reducing noise contributions in the receive path.
推荐
Imaging Systems
Ultrasound and medical imaging front-ends benefit from the THS4031's 60-ns settling time to 0.1%, which supports accurate pixel and time-gated processing, and its 1.6 nV/Hz noise floor that preserves echo signal detail from piezo transducers. Operating from +/-5V to +/-15V supplies allows direct interfacing with bipolar transducer signals. The amplifier drives cable and filter loads with its 90-mA output, and its low offset of 0.5 mV typ minimizes baseline drift across scan lines in high-dynamic-range imaging chains.
推荐
ADC Driver Stage
As an ADC driver, the THS4031 settles to 0.1% in 60 ns and produces only -90 dBc distortion at 1 MHz into 1k ohm, preserving SFDR for 12- to 16-bit converters. Placed directly before the ADC input in inverting or gain-of-2 configuration, its 90-mA output drives the ADC's dynamic input charge injection. Supplying the device from +/-5V keeps output swing compatible with unipolar ADC input ranges via level shifting, and the low 1.6 nV/Hz noise does not degrade the converter's noise floor at typical closed-loop gains.
推荐
Active Filters
The THS4031's 275-MHz unity-gain bandwidth and stability in gains of -1 or greater make it ideal for high-frequency multiple-feedback and Sallen-Key active filters in the 1- to 20-MHz range. Its 1.6 nV/Hz noise contributes minimal noise gain to the filter passband, and its low offset (0.5 mV typ) keeps DC accuracy in DC-coupled topologies. The amplifier's flat bandwidth at moderate gains preserves the intended filter Q and cutoff frequency, while the DGK power pad ensures a low-impedance ground that prevents high-frequency ground loops.
推荐
Test and Measurement Instrumentation
Bench instruments, scopes front-ends, and signal generators use the THS4031 as a low-noise gain stage where its -72 dBc THD at 1 MHz keeps harmonics below measurement resolution. The 100-V/us slew rate reproduces fast edges without distortion, and the +/-15V supply operation provides generous output swing for driving attenuators and coaxial lines through 50-ohm back-termination. Its 8.5-mA quiescent current per channel keeps instrument internal power budgets manageable while delivering lab-grade signal fidelity across the -40C to +85C operating range.
推荐
Video and Imaging Buffer
The THS4031 buffers video and high-speed imaging signals where its 60-ns settling and 100-V/us slew rate support standard and high-resolution video bandwidths with minimal differential gain and phase error. Used in a gain-of-2 configuration to drive back-terminated 75-ohm or 50-ohm coaxial cable, its 90-mA output capability maintains signal amplitude into heavy loads. The low input offset of 0.5 mV typ avoids visible brightness shifts, and the compact 8-pin HVSSOP (DGK) package fits dense multiplexed video routing boards.
推荐
推荐产品汇总
工程参考数据： THS4031 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | THS4031Q-Q1 | THS4031CDGNR | THS4032IDGNR |
|---|---|---|---|---|
| Package | 8-HVSSOP (DGK) | 8-HVSSOP (DGK) - same | 8-HVSSOP (DGK) - same | 8-HVSSOP (DGK) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Channels | 1 | 1 | 1 | 2 |
| Bandwidth | 100 MHz (G=2) | 100 MHz | 100 MHz | 100 MHz |
| Voltage Noise | 1.6 nV/Hz | 1.6 nV/Hz | 1.6 nV/Hz | 1.6 nV/Hz |
| Slew Rate | 100 V/us | 100 V/us | 100 V/us | 100 V/us |
| Supply Current | 8.5 mA/ch | 8.5 mA/ch | 8.5 mA/ch | 8.5 mA/ch (x2) |
| Temperature Range | -40C to +85C | -40C to +125C (automotive) | 0C to +70C | -40C to +85C |
| AEC-Q100 | Not qualified | Qualified | Not qualified | Not qualified |
关键差异点
- Ultra-low 1.6 nV/Hz voltage noise （对比 THS4011CDGNR)
- Automotive-grade drop-in option （对比 THS4031Q-Q1)
- Low power per channel （对比 THS4032IDGNR)
设计说明
Solder the HVSSOP (DGK) PowerPAD to a contiguous copper ground plane. The pad is not optional - it provides the primary thermal path and a low-inductance ground connection essential for the 275-MHz unity-gain bandwidth. Per the TI THS403x datasheet, use a 4x4 via array (or more) under the pad tied to the ground plane to minimize thermal resistance and prevent high-frequency ground bounce.
Decouple both supplies with 0.1-uF ceramic capacitors placed within 2 mm of the V+ (pin 7) and V- (pin 4) pins, plus 2.2-uF or 6.8-uF bulk tantalum capacitors per supply rail. At +/-15V supplies, keep total dissipation in mind: 8.5 mA quiescent plus load current through the headroom. Poor decoupling at high frequency causes peaking and potential oscillation at unity-gain-critical gains.
The THS4031 is stable only in gains of -1 V/V or greater (noise gain >= 2). Using it as a pure unity-gain follower with low feedback resistance may cause instability. Use feedback resistors in the several-hundred-ohm to few-kilohm range - too large a value interacts with input capacitance and adds noise; too small overloads the output stage. Source: TI THS403x datasheet application section.
合规信息
RoHS compliant per TI product page and internal database. AEC-Q100 not applicable to standard grade - use THS4031Q-Q1 for automotive qualification.
