OPA4209AIPWR - Quad 2.2nV/rtHz 18MHz 36V Precision Op Amp | TI
MPN: OPA4209AIPWR ✓ Hoạt độngOPA4209AIPWR Tóm tắt
An operational amplifier is a high-gain DC-coupled electronic voltage amplifier with differential inputs and a single-ended output, forming the fundamental building block of analog signal chains. Precision op amps in particular target low offset voltage, low input bias current, low noise, and high open-loop gain so they can amplify millivolt-level signals without adding meaningful error. The OPA4209 belongs to the precision low-noise op-amp family (precision op amp -> low-noise amplifier -> operational amplifier -> analog IC -> semiconductor), bridging sensor/transducer signal conditioning and downstream ADC drivers.
Key features include 2.2 nV/√Hz input voltage noise density at 1 kHz, 18 MHz unity-gain bandwidth, 6.5 V/µs slew rate, 130 dB open-loop gain (AOL), 150 µV typical input offset voltage, and rail-to-rail output swing. The device is unity-gain stable and accepts capacitive loads up to 1 nF, simplifying its use as a buffer or transducer interface without external compensation. The TSSOP-14 surface-mount package has a thermal resistance (θJA) of approximately 130 °C/W, requiring attention to total dissipation in multi-channel operation at high ambient temperature.
The OPA4209AIPWR uses TI's proprietary precision bipolar process with a trimmed input stage to deliver 130 dB AOL and low offset drift across the full -40 °C to +125 °C range. Its CMOS-compatible input bias current (~ 1 nA typical) simplifies interface to high-impedance sensors and photodiode front ends. The RRO architecture eliminates the need for negative rails in single-supply systems, maximizing dynamic range in low-voltage 5 V or 12 V designs.
Typical applications include precision data acquisition front ends, 16-bit and 18-bit SAR ADC drivers, industrial process-control analog I/O, multi-channel sensor signal conditioning (strain gauge, RTD, thermocouple), medical instrumentation, test-and-measurement equipment, and active filters. The wide 36 V supply range also makes it suitable for ±15 V pro-audio and industrial automation boards.
When designing with this amplifier, observe the input common-mode range which extends to the negative rail but stays approximately 1.5 V below the positive rail (it is not a true RRIO). For 5 V single-supply designs, this is usually not a problem; for 36 V designs, ensure VCM stays within the linear input range to avoid distortion.
This page synthesizes distributor pricing, drop-in alternatives (including same-brand TSSOP-14 quads from the OPAx209 family and cross-brand equivalents), comparison parameters, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho OPA4209AIPWR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với OPA4209AIPWR (cùng hình factor và footprint) — khác nhau ở Amplifier Type, MSL Level, Output Swing, Package, RoHS Status.
OPA4209AIPWT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
OPA4209AIPW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
OPA4227PA
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
OPA4140AIPW
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →OPA4209AIPWR Tỷ lệ tối đa & tính chất điện
| Number of Channels | 4 (Quad) |
| Amplifier Type | Precision, Low-Noise |
| Input Voltage Noise Density | 2.2 nV/√Hz at 1 kHz |
| Unity-Gain Bandwidth (GBW) | 18 MHz |
| Slew Rate | 6.5 V/µs |
| Supply Voltage Range (Single) | 4.5 V to 36 V |
| Supply Voltage Range (Dual) | ±2.25 V to ±18 V |
| Quiescent Current per Channel | 2.5 mA (max) |
| Input Offset Voltage (Vos) | 150 µV (typ) |
| Open-Loop Gain (AOL) | 130 dB |
| Output Swing | Rail-to-Rail Output (RRO) |
| Input Common-Mode Range | Includes negative rail, 1.5 V below positive rail |
| Khoảng nhiệt độ hoạt động | -40 °C to +125 °C |
| Hộp | 14-pin TSSOP (PW) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 2 (260 °C, 1 year) |
| Trạng thái RoHS | Compliant (ROHS3) |
Cấu hình chân OPA4209AIPWR
| Chân 1 | OUT A — Output of channel A |
| Chân 2 | -IN A — Inverting input of channel A |
| Chân 3 | +IN A — Non-inverting input of channel A |
| Chân 4 | V- — Negative supply (or GND for single-supply) |
| Chân 5 | +IN B — Non-inverting input of channel B |
| Chân 6 | -IN B — Inverting input of channel B |
| Chân 7 | OUT B — Output of channel B |
| Chân 8 | OUT C — Output of channel C |
| Chân 9 | -IN C — Inverting input of channel C |
| Chân 10 | +IN C — Non-inverting input of channel C |
| Chân 11 | V+ — Positive supply |
| Chân 12 | +IN D — Non-inverting input of channel D |
| Chân 13 | -IN D — Inverting input of channel D |
| Chân 14 | OUT D — Output of channel D |
Ứng dụng tiêu biểu
OPA4209AIPWR phù hợp cho 7 Áp dụngs: 16-bit / 18-bit SAR ADC Driver, Industrial Process-Control Analog I/O, Multi-Channel Sensor Signal Conditioning, Medical Instrumentation Front End, Test-and-Measurement Active Filters, Pro-Audio Line Drivers and Headphone Buffers, Precision Photodiode / Transimpedance Front End.
16-bit / 18-bit SAR ADC Driver
The OPA4209AIPWR is well matched as a precision buffer/driver for high-resolution successive-approximation ADCs because its 2.2 nV/√Hz voltage noise floor is below the 16-/18-bit LSB step at any practical full-scale range, and its 18 MHz GBW / 6.5 V/µs slew rate settle to one LSB within typical ADC acquisition windows. Its rail-to-rail output maximises dynamic range on 5 V or 12 V analog rails. Place the op-amp within 5 mm of the ADC input pins and use a ground-referenced Kelvin connection to the ADC reference decoupling capacitor. Unlike the lower-bandwidth OPA2277, the OPA4209 will not limit throughput on AD7768 or ADS131M0x-class converters.
Được đề xuất
Industrial Process-Control Analog I/O
The OPA4209AIPWR's 36 V supply tolerance makes it directly usable on ±15 V industrial analog I/O cards and 24 V transducer rails without level shifting, while its 4-channel TSSOP-14 footprint saves board area versus four discrete dual op amps. Typical signal chain: ±10 V sensor input -> OPA4209 instrumentation stage -> PGA -> ADC. Its 130 dB open-loop gain and 150 µV offset voltage keep total unadjusted error below 0.005 % over the -40 °C to +125 °C range. Add TVS protection on the inputs because the OPA4209 input stage is not designed to survive >36 V differential or common-mode transients; check the absolute-maximum table in the datasheet.
Được đề xuất
Multi-Channel Sensor Signal Conditioning
Strain-gauge bridges, RTDs, thermocouples, and photodiode front ends all require low-noise, high-gain amplification that does not swamp the sensor signal with op-amp noise. The OPA4209AIPWR's 2.2 nV/√Hz floor at 1 kHz gives an ENR advantage of ~5 dB over 5 nV/√Hz alternatives at typical sensor bandwidth, while its quad-channel density enables four bridges to be conditioned on one TSSOP-14 footprint. Use chopper-stabilised op amps (e.g. AD8628) only when sensor source impedance is very high; for strain-gauge applications the OPA4209's drift and noise balance is a better practical choice.
Được đề xuất
Medical Instrumentation Front End
ECG, EEG, EMG, and pulse-oximeter front ends require extremely low noise to detect sub-millivolt bioelectric signals. The OPA4209AIPWR's 2.2 nV/√Hz and 130 dB open-loop gain keep input-referred noise well below bioelectric signal amplitudes, and the 18 MHz GBW preserves signal fidelity for diagnostic bandwidths up to several kHz. Quad density allows 4-lead ECG conditioning in one IC. Per IEC 60601-1 isolation requirements, follow the OPA4209 with an isolation amplifier (e.g. ISO124); the OPA4209 itself is not an isolated device. Note: medical safety certification belongs to the system integrator, not the op-amp supplier.
Được đề xuất
Test-and-Measurement Active Filters
Active low-pass, high-pass, and band-pass filters in T&M equipment demand low-noise, high-bandwidth op amps to preserve filter Q and minimise in-band noise. The OPA4209AIPWR's 18 MHz GBW supports Sallen-Key or multiple-feedback filter designs with cutoff frequencies up to several hundred kHz, and its 2.2 nV/√Hz floor keeps filter in-band noise floor below typical DMM or scope measurement resolution. Unity-gain stable with up to 1 nF capacitive load simplifies direct drive of long PCB traces without oscillation. Quiescent current of 2.5 mA per channel is acceptable for bench equipment but watch total dissipation in a sealed enclosure.
Được đề xuất
Pro-Audio Line Drivers and Headphone Buffers
Pro-audio line drivers need >110 dB dynamic range, low THD, and the ability to swing close to the rails to maximise headroom on ±15 V supplies. The OPA4209AIPWR's 130 dB AOL and 2.2 nV/√Hz noise deliver THD+N below 0.0008 % in audio-bandwidth line-stage circuits, while its 36 V supply tolerance supports ±18 V pro-audio rails. Rail-to-rail output maximises headphone-amp output swing on single 12 V or 5 V supplies. For multi-driver headphone amplifiers, place 10 Ω-100 Ω output resistors in series to isolate capacitive headphone loads from the op-amp output stage.
Được đề xuất
Precision Photodiode / Transimpedance Front End
Photodiode transimpedance amplifiers need very low current noise, low voltage noise, and sufficient GBW to handle the photodiode's capacitance-compensated bandwidth. The OPA4209AIPWR's 2.2 nV/√Hz input noise and 18 MHz GBW support TIAs up to several MHz of closed-loop bandwidth for medium-capacitance PIN photodiodes. Use the JFET-input dual OPA2209 instead when input bias current must be sub-nA. Place a feedback capacitor (C_F) chosen for Q ≈ 1/√(GBW/(4π R_F C_IN))) to flatten the frequency response and avoid peaking.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho OPA4209AIPWR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | OPA4209AIPWT | OPA4209AIPW | OPA4227PA | OPA4140AIPW |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-pin TSSOP (PW) | 14-pin TSSOP (PW) - same | 14-pin TSSOP (PW) - same | 14-pin PDIP (N) - through-hole | 14-pin TSSOP (PW) - same |
| Number of Channels | 4 | 4 | 4 | 4 | 4 |
| Voltage Noise Density | 2.2 nV/√Hz | 2.2 nV/√Hz | 2.2 nV/√Hz | 3.0 nV/√Hz | 5.5 nV/√Hz |
| Unity-Gain Bandwidth | 18 MHz | 18 MHz | 18 MHz | 8 MHz | 11 MHz |
| Supply Voltage Range | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | ±18 V | ±18 V |
| Quiescent Current per Channel | 2.5 mA (max) | 2.5 mA (max) | 2.5 mA (max) | 0.8 mA | 0.85 mA |
| Output Type | Rail-to-Rail Output (RRO) | Rail-to-Rail Output (RRO) | Rail-to-Rail Output (RRO) | Standard (no RRO) | Rail-to-Rail Output (RRO) |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C | -40 °C to +125 °C |
Bảo phân biệt quan trọng
- Industry-leading noise / bandwidth combination in 14-pin TSSOP (vsOPA4140AIPW)
- Rail-to-rail output with 130 dB open-loop gain (vsOPA4227PA)
- Wide 36 V supply tolerance in compact TSSOP-14 (vsOPA2277 dual)
Ghi chú thiết kế
Place 0.1 µF ceramic bypass capacitors within 2-3 mm of each supply pin (V+ pin 11 and V- pin 4) to the nearest ground plane, plus a single 10 µF bulk tantalum or ceramic capacitor on the supply rail. The TSSOP-14 thermal pad (exposed pad, if present in your board revision) MUST be soldered to a copper pour of at least 100 mm² to keep θJA below 130 °C/W - otherwise junction temperature can exceed 150 °C at full four-channel load in still air.
The OPA4209 is unity-gain stable up to 1 nF of capacitive load, but for driving long PCB traces (>50 mm) or unbuffered ADCs, add a 10 Ω-50 Ω isolation resistor between the op-amp output and the load. This isolates the load capacitance from the op-amp's output stage and prevents phase-margin loss that manifests as ringing or oscillation. Without the resistor, capacitive loads in the 200 pF-1 nF range can cause 20-30 % peaking at the unity-gain crossover frequency.
The OPA4209 is RRO (rail-to-rail output) but NOT RRIO - the input common-mode range extends to the negative rail but stops ~1.5 V below the positive rail. In a 36 V single-supply design this means the input must stay below ~34.5 V common-mode, which is rarely a problem. In a 5 V single-supply design with rail-to-rail input requirement, choose OPA2192 or OPA2333 instead. Estimated: assuming the typical input bias current of ~1 nA flowing through a 10 kΩ source resistance, the resulting offset error is ~10 µV - generally negligible vs the 150 µV Vos spec.
With all four channels driving 5 V into 1 kΩ loads from a 36 V supply, the OPA4209AIPWR dissipates roughly 4 × (36-5)² / 1 kΩ = 3.8 W - well above the ~0.6 W rating of the TSSOP-14 without thermal vias. The exposed thermal pad MUST be soldered to a 4-layer board copper pour of at least 200 mm² with thermal vias (9×0.3 mm) to a flooded inner plane. Without this, junction temperature can exceed 150 °C under full load, triggering thermal shutdown. Per-channel power = (V+ - V-) × I_OUT + V+ × I_Q.
Thông tin tuân thủ
ROHS3 compliant per DigiKey part detail. Standard part is industrial/consumer grade - AEC-Q100 qualified variant is OPA4209AIPWR-Q1 (not in current distributor cross-reference). REACH compliance stated by TI per product regulatory information.
