AD8622ARZ - Dual Precision RRO Op Amp, 350µA | Analog Devices
MPN: AD8622ARZ ✓ Hoạt độngAD8622ARZ Tóm tắt
An operational amplifier (op amp) is a high-gain DC-coupled differential amplifier that uses external feedback components to set its transfer function. Precision op amps are a sub-category optimized for low offset, low drift, low noise, and high open-loop gain, used as building blocks in instrumentation, sensor signal chains, and reference buffers. The AD8622 belongs to the precision, low-power, rail-to-rail-output family, positioned between general-purpose amplifiers (e.g., AD8628) and higher-precision instrumentation amplifiers (e.g., AD8428) in the Analog Devices portfolio.
Key features include a 560 kHz gain-bandwidth product, 0.5 V/µs slew rate, and an input bias current cancellation circuit that keeps input bias current below 1 pA across the full operating temperature range. The rail-to-rail output swing reaches within 10 mV of either rail, enabling maximum dynamic range on low-voltage single supplies. An internal ESD rating of 2 kV HBM provides robust handling during board assembly.
Typical applications include precision sensor front-ends, weigh scales, strain-gauge amplifiers, medical instrumentation, precision current sensing, thermocouple amplifiers, and battery-powered instrumentation. The wide supply range and low 350 µA quiescent current also suit portable and handheld test equipment where battery endurance is critical.
When designing with this part, place a 1 nF to 10 nF compensation capacitor close to the supply pins to prevent oscillation in high-gain configurations, and ensure input common-mode voltage stays within the datasheet-specified range to preserve linearity. The exposed-pad variant (AD8622ARMZ, MSOP-8) is footprint-compatible for space-constrained boards.
Bộ thay thế dễ dàng lắp đặt cho AD8622ARZ — 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 AD8622ARZ (cùng hình factor và footprint) — khác nhau ở Amplifier Type, Slew Rate, Output Type, Current - Supply, Gain Bandwidth Product.
AD8622ARZ-REEL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD8622AR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD8626ARZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD8627ARZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD8534ARZ-REEL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD8622ARZ Tỷ lệ tối đa & tính chất điện
| Number of Channels | 2 (dual) |
| Amplifier Type | Precision, Rail-to-Rail Output |
| Supply Current (per amplifier) | 350 µA max |
| Supply Voltage Range (Single) | 5 V to 30 V |
| Supply Voltage Range (Dual) | ±2.5 V to ±15 V |
| Input Offset Voltage (typical) | 10 µV |
| Input Offset Voltage Drift | 0.5 µV/°C |
| Input Bias Current | < 1 pA (cancelled) |
| Gain-Bandwidth Product | 560 kHz |
| Slew Rate | 0.5 V/µs |
| Voltage Noise (0.1 Hz to 10 Hz) | 0.2 µV p-p |
| Output Swing | Rail-to-Rail (within 10 mV of rails) |
| Khoảng nhiệt độ hoạt động | -40°C to +125°C |
| Hộp | 8-SOIC (0.154", 3.90 mm width) |
| ESD Rating (HBM) | 2 kV |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD8622ARZ
| Chân 1 | OUT A — Amplifier A output |
| Chân 2 | -IN A — Amplifier A inverting input |
| Chân 3 | +IN A — Amplifier A non-inverting input |
| Chân 4 | V- — Negative supply voltage |
| Chân 5 | +IN B — Amplifier B non-inverting input |
| Chân 6 | -IN B — Amplifier B inverting input |
| Chân 7 | OUT B — Amplifier B output |
| Chân 8 | V+ — Positive supply voltage |
Ứng dụng tiêu biểu
AD8622ARZ phù hợp cho 6 Áp dụngs: Precision Weigh Scale Signal Conditioning, Medical Instrumentation Front-End, Thermocouple and Temperature Measurement, Precision Current Sensing (High-Side / Low-Side), Strain-Gauge and Pressure-Sensor Signal Chains, Battery-Powered Portable Instrumentation.
Precision Weigh Scale Signal Conditioning
The AD8622ARZ is an excellent fit for precision weigh-scale front-ends because its 10 µV typical input offset and 0.5 µV/°C drift directly limit the smallest resolvable weight on a strain-gauge bridge. With 350 µA per amplifier supply current and rail-to-rail output swing, it can drive an ADC reference and instrumentation channels from a single ±15 V supply without thermal concerns. The amplifier's <1 pA input bias current (via internal cancellation) avoids bias-induced errors on high-impedance bridge outputs. In a typical load-cell application, two AD8622 channels provide differential gain (e.g., 100x) plus an active low-pass filter before the 24-bit ADC, achieving 19-bit effective resolution with sub-gram repeatability.
Được đề xuất
Medical Instrumentation Front-End
For medical instrumentation such as ECG, EEG, and patient monitoring front-ends, the AD8622ARZ delivers the precision required for sub-millivolt biopotential signals. The 0.2 µV p-p (0.1 Hz to 10 Hz) voltage noise keeps the noise floor below the electrode thermal noise, while the 560 kHz GBP supports gain stages up to ~100x at audio bandwidths. The low 350 µA/ch supply current extends battery life in portable Holter and ambulatory monitors. The rail-to-rail output maximizes ADC dynamic range on 3.3 V or 5 V single supplies, allowing full-scale utilization of the ADC's input range and improving measurement SNR.
Được đề xuất
Thermocouple and Temperature Measurement
The AD8622ARZ excels in thermocouple-amplifier designs where its 10 µV offset and 0.5 µV/°C drift minimize cold-junction compensation errors. Thermocouple outputs are typically in the tens of microvolts per °C, so the AD8622's low noise floor (0.2 µV p-p) and rail-to-rail output enable accurate readings across the full industrial range. With <1 pA input bias current it avoids self-heating errors from source impedance. Designers typically pair the AD8622ARZ with a low-drift reference and a precision ADC (e.g., AD7799) to achieve better than 0.1°C measurement uncertainty over -40°C to +125°C ambient.
Được đề xuất
Precision Current Sensing (High-Side / Low-Side)
For precision low-side current sensing in battery management and power-monitoring applications, the AD8622ARZ's low offset and low bias current enable accurate measurement across shunt resistors from 10 mΩ to 1 Ω. The rail-to-rail output lets it digitize shunt voltages from millivolts up to near the supply rail, supporting wide dynamic-range designs. The 350 µA quiescent current is acceptable for continuous-monitoring applications, and the 8-SOIC package simplifies layout next to a shunt resistor. Designers commonly use one AD8622 channel as a gain-of-50 differential amplifier across the shunt and the second channel as a low-pass filter before the ADC.
Được đề xuất
Strain-Gauge and Pressure-Sensor Signal Chains
The AD8622ARZ is well-matched to strain-gauge and MEMS pressure-sensor signal chains because its 0.5 µV/°C drift directly translates into measurement stability over temperature. Pressure sensors typically output 10-100 mV full-scale from a 5 V excitation; the AD8622's low offset and noise support 12-16 bit effective resolution after amplification. The dual-channel configuration lets one AD8622 stage provide gain (e.g., 50x) and a second channel implement a 2-pole active low-pass filter. Rail-to-rail output maximizes ADC dynamic range, while the low 350 µA supply current suits portable pressure-calibration instruments.
Được đề xuất
Battery-Powered Portable Instrumentation
The AD8622ARZ suits battery-powered handheld multimeters, calibrators, and field instruments because of its 350 µA max per-amplifier supply current and wide 5 V-30 V single-supply range. The dual-channel configuration halves PCB area versus two single op amps. The rail-to-rail output maximizes dynamic range when operating from low battery voltages (e.g., 3.6 V Li-ion down to 3.0 V), and the low input bias current (<1 pA) is ideal for high-impedance sensor inputs in field applications. The -40°C to +125°C operating range covers outdoor and industrial environments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD8622ARZ — 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 | AD8622ARMZ | AD8622ARZ-REEL7 | AD8622AR | AD8626ARZ | AD8627ARZ |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-MSOP (different) | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| Gain-Bandwidth Product | 560 kHz | 560 kHz | 560 kHz | 560 kHz | Higher (wider bandwidth) | Higher (wider bandwidth) |
| Voltage Noise (0.1 Hz-10 Hz) | 0.2 µV p-p | 0.2 µV p-p | 0.2 µV p-p | 0.2 µV p-p | Higher noise | Higher noise |
| Rail-to-Rail Output | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C |
Bảo phân biệt quan trọng
- Best-in-class precision with 350 µA max supply current per amplifier (vsAD8627ARZ)
- Wide supply voltage range (±2.5 V to ±15 V dual or 5 V to 30 V single) (vsAD8626ARZ)
- Pin-compatible scaling to MSOP-8 footprint (vsAD8622ARMZ)
Ghi chú thiết kế
Estimated: at ±15 V dual supply, each AD8622 channel dissipates approximately 5.25 mW quiescent (15 V × 350 µA). A dual-channel AD8622ARZ dissipates ~10.5 mW total - well within SOIC-8 thermal limits. Add a 0.1 µF ceramic bypass capacitor close to each supply pin (V+ pin 8 and V- pin 4) and a 10 µF bulk capacitor on the supply rail to suppress coupling from upstream switching converters.
Route input traces as differential pairs to minimize common-mode pickup, and keep feedback resistors within 5 mm of the inverting input pin to limit stray capacitance. Place a guard ring around high-impedance +IN inputs tied to the same potential to reduce leakage on FR-4 (which has ~10 GΩ board resistance). When using the dual AD8622 channels for a 2-stage filter, separate the input and output traces to prevent feedback coupling.
Do not exceed the input common-mode voltage range specified in the AD8622 datasheet (Rev. D); inputs must remain within the supply rails minus ~1 V at room temperature. The output is rail-to-Row, but the inputs are NOT rail-to-rail-input - applying a signal beyond the input range will cause phase reversal. For fully rail-to-rail I/O consider the AD8638 family.
For precision DC applications, allow 1-2 minutes warm-up before taking measurements - the input bias current cancellation circuit may exhibit a small startup transient. Use chopper-stabilized alternatives (e.g., AD8628) if sub-microvolt input current continuity is required. Pair the AD8622 with a low-drift voltage reference (e.g., ADR4525) for systems demanding <1 µV/°C system drift.
Thông tin tuân thủ
RoHS and REACH compliant per distributor listings (DigiKey, Mouser). Lead-free (Pb-free) terminal finish per Analog Devices product page. Halogen-free status not explicitly confirmed in verified data - set to unknown. AEC-Q100 qualification not applicable - this is a general-purpose industrial/consumer grade op amp.
