AD843SQ/883B - 34MHz CBFET Fast Settling Op Amp | Analog Devices
料号： AD843SQ/883B ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $25.43 | $25.43 |
| 10 | $23.12 | $231.20 |
| 100 | $20.81 | $2,081.00 |
| 500 | $18.5 | $9,250.00 |
| 1,000 | $16.19 | $16,190.00 |
AD843SQ/883B 概述
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output, used to perform mathematical operations like addition, subtraction, integration, and differentiation in analog circuits. Op amps are fundamental building blocks in analog electronics, forming the basis of filters, buffers, comparators, and instrumentation amplifiers. They are part of the broader category of linear integrated circuits, which also includes voltage regulators, comparators, and timers.
Key features of the AD843SQ/883B include a 34 MHz unity-gain bandwidth, 135 ns settling time to 0.01%, and a slew rate of 250 V/µs (typical). The input offset voltage is 1 mV maximum for the K and B grades, and the input bias current is 0.6 nA typical. The device operates from a supply voltage range of ±4.5 V to ±18 V, and it is stable at gains of 1 or greater. The full power bandwidth is 3.9 MHz, and the device features ground pins between signal pins to reduce crosstalk, achieving -85 dB crosstalk at 5 MHz.
The AD843 uses a CBFET (Complementary Bipolar FET) architecture, combining the low bias current of FET inputs with the high speed of bipolar transistors. This architecture provides excellent DC precision and AC performance, making it suitable for applications such as high-speed data acquisition, active filters, and video amplifiers. The device is specified over the military temperature range of -55°C to +125°C, and the /883B suffix indicates compliance with MIL-STD-883 Class B screening.
Typical applications include high-speed instrumentation, pulse amplifiers, and video processing circuits. The fast settling time and low bias current make it ideal for sample-and-hold circuits and high-speed ADC drivers. The device's high slew rate and bandwidth also make it suitable for use in communication systems and radar signal processing.
When designing with the AD843SQ/883B, ensure proper power supply decoupling with 0.1 µF ceramic capacitors close to the supply pins. The device's high bandwidth requires careful PCB layout to minimize parasitic capacitance and inductance. Also, note that the input common-mode range extends to within 2 V of the supply rails, so input signals should be kept within this range to avoid distortion.
直接替换替代料： AD843SQ/883B ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
AD843SH/883B
✅ 直接替换📋 参考替代料（不在目录中）
AD843SQ/883B 最大额定值与电气特性
| Amplifier Type | General Purpose |
| Number of Circuits | 1 |
| Unity Gain Bandwidth | 34 MHz |
| Settling Time | 135 ns (to 0.01%) |
| Slew Rate | 250 V/µs (typ) |
| Input Bias Current | 0.6 nA (typ) |
| Input Offset Voltage | 1 mV max (K/B grades) |
| Full Power Bandwidth | 3.9 MHz |
| Supply Voltage Range | ±4.5 V to ±18 V |
| 工作温度范围 | -55°C to +125°C |
| 封装 | 8-CERDIP |
| 安装类型 | Through Hole |
| Crosstalk | -85 dB at 5 MHz |
| MIL-STD-883 | Class B compliant |
| RoHS 状态 | Non-compliant (hermetic package) |
AD843SQ/883B 引脚配置
| 引脚 1 | NULL — Offset null |
| 引脚 2 | -IN — Inverting input |
| 引脚 3 | +IN — Non-inverting input |
| 引脚 4 | V- — Negative supply |
| 引脚 5 | NULL — Offset null |
| 引脚 6 | OUT — Output |
| 引脚 7 | V+ — Positive supply |
| 引脚 8 | NC — No connection |
典型应用
AD843SQ/883B 适用于 6 应用s: High-Speed Data Acquisition, Video Signal Processing, Pulse Amplification, Active Filters, Instrumentation Amplifiers, Communication Systems.
High-Speed Data Acquisition
The AD843SQ/883B's 135 ns settling time to 0.01% and 34 MHz bandwidth make it ideal for driving high-speed ADCs and sample-and-hold circuits. Its low input bias current (0.6 nA) minimizes errors when interfacing with high-impedance sensors. In a data acquisition system, the op amp buffers the sensor signal and provides the necessary drive capability for the ADC input, ensuring accurate conversion of fast transients. The fast settling ensures that the ADC sees a stable voltage within its acquisition window, critical for maintaining system throughput.
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Video Signal Processing
With a 34 MHz unity-gain bandwidth and 250 V/µs slew rate, the AD843SQ/883B is well-suited for video amplification and buffering. It can handle composite video signals with minimal distortion, preserving edge sharpness and color accuracy. The high slew rate ensures that large voltage swings, such as sync pulses, are reproduced without slew-induced distortion. In video distribution amplifiers, the op amp provides the necessary drive current for multiple loads while maintaining signal integrity over long cable runs.
推荐
Pulse Amplification
The AD843SQ/883B's fast settling and high slew rate make it excellent for amplifying narrow pulses in nuclear instrumentation, LIDAR, and radar systems. Its low input bias current reduces baseline drift in charge-sensitive preamplifiers. The 135 ns settling time ensures that the output accurately represents the pulse amplitude without overshoot or ringing, which is critical for pulse height analysis. The wide bandwidth preserves the pulse shape, allowing precise timing measurements.
推荐
Active Filters
The 34 MHz bandwidth of the AD843SQ/883B allows the implementation of high-frequency active filters, such as Butterworth or Chebyshev low-pass filters, with cutoff frequencies in the megahertz range. Its high slew rate ensures that large amplitude signals do not cause distortion, maintaining filter accuracy. The low input bias current is beneficial in filter designs using high-value resistors, as it reduces DC offset errors. The op amp's stability at gains of 1 or greater simplifies filter design.
推荐
Instrumentation Amplifiers
The AD843SQ/883B can be used as a building block in discrete instrumentation amplifiers, providing high speed and precision. Its low input bias current and offset voltage contribute to accurate measurement of small differential signals. The high common-mode rejection ratio, combined with the op amp's wide bandwidth, allows the instrumentation amplifier to reject interference while amplifying fast transients. This makes it suitable for medical instrumentation, industrial process control, and test equipment.
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Communication Systems
In communication systems, the AD843SQ/883B is used in IF (intermediate frequency) amplification, AGC (automatic gain control) circuits, and active filters. Its 34 MHz bandwidth covers common IF frequencies, and its fast settling time is beneficial in time-division multiplexing systems. The low distortion and high slew rate ensure signal fidelity in QAM and other modulation schemes. The device's military temperature range makes it suitable for aerospace and defense communication equipment.
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推荐产品汇总
工程参考数据： AD843SQ/883B ——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 | AD843SH/883B | AD843SE/883B | AD843JNZ | AD843JRZ-REEL | OPA627BP |
|---|---|---|---|---|---|---|
| Package | 8-CERDIP | 8-CERDIP (same) | 20-LCC | 8-PDIP | 8-SOIC | 8-PDIP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Unity Gain Bandwidth | 34 MHz | 34 MHz | 34 MHz | 34 MHz | 34 MHz | 16 MHz |
| Slew Rate | 250 V/µs | 250 V/µs | 250 V/µs | 250 V/µs | 250 V/µs | 55 V/µs |
| Input Bias Current | 0.6 nA | 0.6 nA | 0.6 nA | 0.6 nA | 0.6 nA | 5 pA |
| Supply Voltage Range | ±4.5 V to ±18 V | ±4.5 V to ±18 V | ±4.5 V to ±18 V | ±4.5 V to ±18 V | ±4.5 V to ±18 V | ±4.5 V to ±18 V |
| Operating Temperature Range | -55°C to +125°C | -55°C to +125°C | -55°C to +125°C | 0°C to +70°C | 0°C to +70°C | -25°C to +85°C |
| MIL-STD-883 | Class B | Class B | Class B | No | No | No |
关键差异点
- MIL-STD-883 Class B screening （对比 AD843JNZ)
- Hermetic CERDIP package （对比 AD843JRZ-REEL)
- Higher slew rate and bandwidth （对比 OPA627BP)
设计说明
For optimal high-frequency performance, place 0.1 µF ceramic capacitors as close as possible to the V+ and V- pins (pins 7 and 4). Additionally, use a 10 µF tantalum capacitor in parallel for bulk decoupling. Keep the feedback network components close to the inverting input to minimize parasitic capacitance, which can cause peaking in the frequency response.
The AD843SQ/883B in a CERDIP package has a thermal resistance (θJA) of approximately 100°C/W. For high-power applications, ensure adequate airflow or heatsinking. The maximum junction temperature is 175°C, so calculate power dissipation (PD = (V+ - V-) * I_Q + (V+ - VOUT) * I_OUT) and ensure the junction temperature stays within limits.
Do not exceed the absolute maximum supply voltage of ±18 V. Also, avoid driving capacitive loads greater than 100 pF directly, as this can cause instability. If driving larger capacitive loads, use a series resistor (e.g., 50 Ω) at the output. Additionally, the input common-mode range is limited to within 2 V of the supply rails; ensure input signals stay within this range to avoid distortion.
合规信息
Hermetic CERDIP package contains lead-based solder, so not RoHS compliant. MIL-STD-883 Class B compliant.
