OPA1612AIDR - 1.1nV/√Hz Dual Audio Op Amp | Texas Instruments
MPN： OPA1612AIDR ✓ 啟用中OPA1612AIDR 概覽
What is a bipolar-input operational amplifier? A bipolar-input operational amplifier uses bipolar transistor input devices to provide low-voltage noise and precise analog signal handling. In the broader hierarchy, an operational amplifier is an analog IC, an amplifier IC, and part of a signal-conditioning or active-filter system. Audio applications require low noise, low total harmonic distortion, adequate output drive, and predictable behavior with capacitive and feedback networks.
The verified data identifies the OPA1612 as a high-performance audio amplifier with 1.1 nV/√Hz noise density. The manufacturer datasheet states rail-to-rail output swing to within 600 mV with a 2 kΩ load and output drive capability of ±30 mA. Those figures help preserve dynamic range and allow the amplifier to drive downstream audio stages more effectively than a low-current precision op amp. The OPA1612AIDR is identified as an 8-SOIC, dual-circuit device.
The bipolar input architecture is intended for low-noise audio signal conditioning rather than general-purpose low-power sensing. Its distortion specification of 0.000015% at 1 kHz is particularly relevant for headphone buffers, mixing-console stages, active crossovers, and studio signal paths. The rail-to-rail output characteristic improves usable swing near the supply limits, although input and output common-mode behavior must still be checked against the system rails.
Typical applications include stereo line-input amplification, headphone-driver buffering, active low-pass and high-pass filters, microphone preamplifier stages, audio ADC drivers, and balanced audio signal-chain interfaces. The dual-channel configuration reduces the number of amplifiers required in a stereo design while keeping the two channels in one standard 8-SOIC footprint.
The principal design consideration is to preserve low-noise performance with suitable bypassing, stable feedback compensation, and careful grounding. Keep input and feedback traces short, place decoupling capacitors close to the supply pins, and account for the amplifier’s ±30 mA output-drive capability when selecting the next stage. For a direct PCB substitution, confirm the exact package, pinout, supply range, and electrical limits against the replacement datasheet.
直接替換替代品，適用於 OPA1612AIDR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： OPA1612AIDR （相同外形與佔位） — 差異在於 Distortion, Number of Channels, Package, RoHS Status.
OPA1612AIDRGT
✅ 直接替換📋 參考替代品（不在目錄中）
OPA1612AIDRGR
✅ 直接替換📋 參考替代品（不在目錄中）
OPA1612AID
✅ 直接替換📋 參考替代品（不在目錄中）
OPA1612A
✅ 直接替換📋 參考替代品（不在目錄中）
OPA1612AIDRGT
✅ 直接替換📋 參考替代品（不在目錄中）
TPA6120A2DWPG4
✅ 直接替換📋 參考替代品（不在目錄中）
OPA1612AIDR 最大額定值與電氣特性
| Number of Channels | 2 |
| Input Type | Bipolar input |
| 雜訊密度 | 1.1 nV/√Hz |
| Distortion | 0.000015% at 1 kHz |
| Output Swing | Rail-to-rail to within 600 mV with a 2 kΩ load |
| Output Drive Capability | ±30 mA |
| 封裝 | 8-pin SOIC |
| Circuit Type | Dual operational amplifier |
| Application | Professional audio and sound applications |
| 工作溫度 | -40 °C to +85 °C |
| 安裝類型 | Surface mount |
| MSL | MSL Level 2, 260 °C, 1 year |
| RoHS 狀態 | RoHS3 compliant |
| REACH Status | REACH compliant |
OPA1612AIDR 8-pin soic 腳位配置指南
OPA1612AIDR（8-pin soic 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： OPA1612AIDR.
請參閱 資料表 以查看完整腳位配置。
典型應用
OPA1612AIDR 適用於 6 應用s: Professional Audio Line Buffer, Headphone Output Driver, Active Audio Crossover, Microphone Preamplifier, Audio ADC Input Driver, Balanced Audio Interface.
Professional Audio Line Buffer
OPA1612AIDR fits a stereo line-buffer stage because it combines a 1.1 nV/√Hz noise density with very low 0.000015% distortion at 1 kHz. Place one channel ahead of each line input and use the dual SOIC to reduce external amplification stages. The manufacturer-verified ±30 mA output drive provides useful margin for downstream audio circuitry, while rail-to-rail output swing to within 600 mV into a 2 kΩ load helps preserve signal range. The exact supply limits must be confirmed from the complete datasheet.
推薦
Headphone Output Driver
OPA1612AIDR is suitable for a headphone-buffer or line-driver experiment when the load is within the device’s verified drive capability. Its ±30 mA output current and rail-to-rail output swing can increase usable headroom compared with a low-current amplifier, while the 1.1 nV/√Hz noise density helps preserve quiet signal paths. It is not a substitute for a dedicated power headphone amplifier without checking load current, voltage swing, thermal behavior, and stability.
推薦
Active Audio Crossover
Use OPA1612AIDR in an active low-pass or high-pass audio crossover where low noise and low distortion matter in the passband. Its 1.1 nV/√Hz noise density reduces the amplifier’s contribution to quiet listening levels, while the 0.000015% distortion figure at 1 kHz helps preserve waveform fidelity around the crossover region. The dual package can implement two channels, but resistor and capacitor values must be calculated from the desired poles and checked against the complete datasheet.
推薦
Microphone Preamplifier
OPA1612AIDR can serve as a low-noise stage around microphone or line-level audio sources when the circuit operates within the verified supply and common-mode limits. The bipolar-input architecture and 1.1 nV/√Hz noise density are aligned with low-level signal conditioning, while the dual package allows two microphone channels to share one device. Proper input biasing, gain-setting resistors, grounding, and feedback compensation are essential; the supplied data does not provide offset or bias-current values.
推薦
Audio ADC Input Driver
OPA1612AIDR is appropriate for driving an audio-conversion front end when the downstream ADC requires low distortion and a low-noise analog source. The amplifier’s 0.000015% distortion at 1 kHz supports high-fidelity signal transfer, and its rail-to-rail output swing can provide useful range when supply limits permit. Place the amplifier close to the ADC input, use short traces, and verify the ADC’s input bandwidth, settling requirements, and recommended driver topology before finalizing the design.
推薦
Balanced Audio Interface
OPA1612AIDR can support balanced audio signal conditioning in studio, instrument, or communications equipment where low-noise amplification is required on each polarity. Its dual-channel architecture simplifies paired positive and negative signal paths, and the 1.1 nV/√Hz noise density helps limit added circuit noise. The output swing and ±30 mA drive capability are useful for downstream line drivers, but common-mode range, supply voltage, stability, and channel-to-channel matching must be verified before production use.
推薦
推薦產品摘要
工程參考資料，適用於 OPA1612AIDR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | OPA1612AIDRGT | OPA1612AIDRGR | OPA1612AID | OPA1612A | TPA6120A2DWPG4 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
主要差異化特點
- Very low verified noise density (對比OPA1612AID)
- Audio-focused distortion specification (對比OPA1612AIDRGT)
- Dual-channel implementation (對比TPA6120A2DWPG4)
設計說明
Place the supply-bypass capacitors close to the OPA1612AIDR supply pins and keep the input, feedback, and output traces short. The verified 1.1 nV/√Hz noise density describes the device, not the complete PCB; long traces, shared return paths, and inductively coupled switching nodes can dominate the system noise floor. Follow the recommended application layout in the Texas Instruments datasheet.
Use the manufacturer’s recommended feedback network and verify stability with the intended load and cable capacitance. The verified specification of ±30 mA output drive does not establish capacitive-load tolerance or bandwidth. In particular, do not assume that a high-current output stage is automatically stable with every audio cable, headphone transducer, or ADC input; confirm these conditions experimentally and from the datasheet.
Keep analog and digital return currents separated as far as the board architecture allows, and use a quiet ground reference for the audio path. The rail-to-rail output swing to within 600 mV with a 2 kΩ load is useful, but the available headroom depends on the actual supply voltage and load. Confirm supply limits and output-current limits before using the part as a line or headphone driver.
合規資訊
The supplied cross-reference result identifies OPA1612AIDR as RoHS3 compliant, REACH compliant, and MSL Level 2 at 260 °C for one year. AEC-Q100 status, lead-free status, halogen-free status, and conflict-minerals status are not established by the supplied data.