LM2904DRG3 - Dual 26 V, 700 kHz Op Amp | Texas Instruments
料号： LM2904DRG3 ✓ 量产中LM2904DRG3 概述
An operational amplifier is a voltage-feedback amplifier that uses high open-loop gain to amplify the difference between its inverting and non-inverting inputs. Operational-amplifier ICs sit within the broader amplifier hierarchy and are widely used in analog signal chains for sensing, buffering, filtering, comparison, and closed-loop control. The LM2904 contains two frequency-compensated amplifiers, allowing one package to serve two independent analog functions.
The LM2904 provides a 700 kHz gain-bandwidth product, 0.3 V/us typical slew rate, and approximately 0.7 mA typical supply-current drain. Its common-mode input range includes ground, which makes it useful in single-supply applications that process signals near the lower supply rail. The 26 V maximum supply rating provides additional operating headroom for industrial and automotive-style circuits when the board is otherwise designed for lower voltages.
Each amplifier is frequency compensated and intended for general-purpose closed-loop operation. Its approximately 700 kHz gain-bandwidth product supports signal paths that do not require the bandwidth of modern precision or high-speed amplifier families. The dual configuration can implement two amplifiers per package, reducing board area in designs such as sensor conditioning, active filtering, error amplifiers, and low-frequency control loops. The 8-SOIC package is also a practical option for through-hole assembly processes.
Typical applications include low-frequency sensor signal conditioning, active filters, audio preamplifier stages, battery-powered instrumentation, and industrial control interfaces. In a typical application, the amplifier is configured with external feedback resistors or capacitors, while the non-inverting input receives the sensor or reference signal. Single-supply operation is especially useful when the input signal remains close to ground and a negative supply is undesirable.
Designers should verify the input and output common-mode limits across the intended supply voltage and load current, and should use suitable bypassing capacitors near the power pins. Stable operation also depends on following the recommended feedback-network values and ensuring the source and load impedances do not compromise gain, noise, or phase margin. The 8-SOIC footprint leaves adequate routing space for conventional external compensation or gain-setting components where needed.
This page combines the manufacturer product information with practical package, sourcing, replacement, and design guidance. It highlights the LM2904DRG3's useful balance of dual-channel integration, wide supply range, conventional bandwidth, and assembly compatibility for cost-conscious general-purpose analog designs.
直接替换替代料： LM2904DRG3 ——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： LM2904DRG3 （相同外形与封装尺寸） ——差异在于 Number of Channels, Package.
LM2904DRG3 最大额定值与电气特性
| Amplifier Type | General Purpose |
| Number of Amplifiers | 2 circuits |
| Number of Channels | 2 channels |
| Maximum Supply Voltage | 26 V |
| Gain-Bandwidth Product | 700 kHz |
| Slew Rate | 0.3 V/us |
| Typical Supply Current Drain | 0.7 mA |
| Common-Mode Input Range | Includes ground |
| Supply Configuration | Single supply or split supply |
| 封装 | 8-SOIC |
| Package Width | 3.90 mm (0.154 in) |
| 安装类型 | Surface mount |
| Packaging | Cut Tape (CT) |
LM2904DRG3 3.90 mm (0.154 in) 引脚配置指南
LM2904DRG3（3.90 mm (0.154 in) 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： LM2904DRG3.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM2904DRG3 适用于 6 应用s: Single-Supply Sensor Signal Conditioning, Industrial Active Filtering, Audio Preamplifier Stage, Battery-Powered Instrumentation, Power-Supply Error Amplifier, Data Acquisition Interface.
Single-Supply Sensor Signal Conditioning
The LM2904DRG3 is well suited to conditioning low-frequency sensor outputs when the signal lies near ground and the circuit must operate from one supply. Its common-mode input range includes ground, while the 700 kHz gain-bandwidth product is ample for many resistive-bridge, position, and environmental sensing chains. Configure one amplifier as a non-inverting gain stage or differential buffer, then place the feedback components close to the device. Verify input offset, bias-current error, output swing, and sensor source impedance against the required measurement accuracy; the amplifier's 0.3 V/us slew rate is generally adequate for low-bandwidth signals but can become relevant with long cables, sharp edges, or capacitive loads.
推荐
Industrial Active Filtering
The two amplifiers in the LM2904DRG3 can implement active low-pass, high-pass, or band-pass sections in industrial measurement and control modules. A 700 kHz gain-bandwidth product leaves useful bandwidth for sensors, transducers, and slow process-control loops, while the 26 V maximum supply rating supports a broader operating envelope than 5 V-only amplifier families. Build each filter from the manufacturer application guidance and the intended Q, gain, and cutoff frequency. Keep the grounded non-inverting inputs and feedback nodes away from switching nodes, and validate phase margin with the actual source impedance and load because real-world sensor cables and ADC inputs can introduce capacitance that differs from an ideal simulation.
推荐
Audio Preamplifier Stage
The LM2904DRG3 can provide a general-purpose, low-frequency audio preamplifier stage in single- or dual-supply equipment. Its common-mode range that includes ground supports source signals near 0 V, while the approximately 700 kHz gain-bandwidth product provides ample bandwidth for baseband audio. The practical limits are output swing, noise, distortion, and stability into the next stage rather than unity-gain bandwidth alone. Use the manufacturer's recommended resistor and compensation values, maintain adequate output-current margin for the following load, and check distortion at the intended signal level. For microphones requiring very low noise or rail-to-rail output swing, a dedicated low-noise audio amplifier may offer a better system match.
推荐
Battery-Powered Instrumentation
The LM2904DRG3 is useful in battery-powered instrumentation where low supply-current demand and single-supply operation help conserve energy. Its typical supply-current drain is approximately 0.7 mA, and the common-mode input range includes ground for interfaces that operate close to the lower rail. Two amplifiers can implement gain, buffering, and active filtering without requiring separate packages. Confirm whether the 0.7 mA figure applies per amplifier or to the device configuration in the relevant datasheet row, and evaluate the operating current across temperature. Long battery-life designs should also include a controlled shutdown strategy and verify that signal headroom remains adequate as the supply voltage falls.
推荐
Power-Supply Error Amplifier
One LM2904DRG3 amplifier can serve as the error amplifier in a linear-regulator feedback loop, while the second channel can monitor another rail or provide an additional filtering function. The 26 V supply rating is useful for wider input-voltage environments, and the 700 kHz gain-bandwidth product can participate in loops that do not require very high bandwidth. Compensation and feedback-divider values must be derived from the regulator topology and external pass-device characteristics. Confirm loop stability over the full load and temperature range, account for the amplifier's output-current capability, and keep the high-impedance feedback node compact and shielded from switching-node coupling to prevent instability or excessive output ripple.
推荐
Data Acquisition Interface
The LM2904DRG3 can condition transducer outputs before an ADC in a data-acquisition front end. Its approximately 700 kHz gain-bandwidth product supports moderate-bandwidth acquisition channels, and the common-mode input range including ground simplifies circuits that measure bipolar or near-zero sensor signals on a single supply. Use one channel for gain and the other for anti-alias or offset filtering, or configure them for differential conditioning where the ADC topology allows it. Check the ADC's input range against the amplifier output swing, place the anti-alias capacitor close to the ADC input, and account for amplifier offset and noise when calculating the smallest resolvable signal. High-precision measurements may require a lower-offset amplifier.
推荐
工程参考数据： LM2904DRG3 ——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 | LM2904D | LM2904DR |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same |
| Amplifier Type | General Purpose | General Purpose | General Purpose |
| Number of Circuits | 2 | 2 | 2 |
| Maximum Supply Voltage | 26 V | 26 V | 26 V |
| Gain-Bandwidth Product | 700 kHz | 700 kHz | 700 kHz |
| Slew Rate | 0.3 V/us | 0.3 V/us | 0.3 V/us |
| Common-Mode Input Range | Includes ground | Includes ground | Includes ground |
| Supply Configuration | Single or split supply | Single or split supply | Single or split supply |
| Special Features | Two independent frequency-compensated amplifiers | Two independent frequency-compensated amplifiers | Two independent frequency-compensated amplifiers |
关键差异点
- Matches the LM2904 family's dual general-purpose configuration （对比 LM2904D)
- Provides the same core performance as the other identified 8-SOIC ordering （对比 LM2904DR)
- Combines two amplifier channels in one 8-SOIC package （对比 LM2904D)
设计说明
Place the supply-bypass capacitor close to the LM2904 power and ground pins, and keep input and feedback traces short. High-impedance non-inverting inputs are particularly sensitive to leakage and surface contamination, so avoid routing them near switched power nodes. For a dual amplifier, maintain separate quiet return paths where channel coupling or analog and digital return currents could otherwise mix.
The LM2904 can operate from a single supply or split supplies, but the usable input and output range must remain valid at every supply combination. The 26 V value is a maximum rating, not a required operating voltage. Check common-mode headroom and output swing into the actual load at the lowest supply voltage, and do not allow transients on the supply pins to exceed the device's absolute-maximum limits.
Do not select the LM2904 solely because another device is described as a dual op amp. Pin assignment, common-mode range, output swing, offset, drift, noise, slew rate, and stability requirements must all be checked. The 700 kHz gain-bandwidth product is suitable for general-purpose and low-frequency circuits, but it is insufficient for demanding precision settling, high-speed ADC drivers, or wide-band audio applications.
合规信息
The visible manufacturer product information does not state the exact compliance status of LM2904DRG3. Confirm material and qualification declarations for the specific ordering code before releasing a regulated design.
