AD8622ARZ - Dual Precision RRO Op Amp, 350µA | Analog Devices
N.º da peça: AD8622ARZ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $5.2 | $5,20 |
| 10 | $4.68 | $46,80 |
| 100 | $4.1 | $410,00 |
| 500 | $3.62 | $1.810,00 |
| 1.000 | $2.93 | $2.930,00 |
AD8622ARZ Visão geral
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.
Alternativas drop-in para AD8622ARZ — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com AD8622ARZ (mesmo formato e footprint) — diferindo em Amplifier Type, Slew Rate, Output Type, Current - Supply, Gain Bandwidth Product.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
AD8622ARZ-REEL7
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD8622AR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD8626ARZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD8627ARZ
✅ Drop-In✓ Em estoque
$2.82 / unidade
Ver ficha técnica →AD8534ARZ-REEL
✅ Drop-In✓ Em estoque
$1.28 / unidade
Ver ficha técnica →AD8622ARZ Classificações máximas e características elétricas
| 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) |
| Faixa de temperatura de operação | -40°C to +125°C |
| Encapsulamento | 8-SOIC (0.154", 3.90 mm width) |
| ESD Rating (HBM) | 2 kV |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
Configuração de pinos do AD8622ARZ
| Pino 1 | OUT A — Amplifier A output |
| Pino 2 | -IN A — Amplifier A inverting input |
| Pino 3 | +IN A — Amplifier A non-inverting input |
| Pino 4 | V- — Negative supply voltage |
| Pino 5 | +IN B — Amplifier B non-inverting input |
| Pino 6 | -IN B — Amplifier B inverting input |
| Pino 7 | OUT B — Amplifier B output |
| Pino 8 | V+ — Positive supply voltage |
Aplicações típicas
AD8622ARZ é adequado para 6 aplicaçãos: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para AD8622ARZ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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 |
Principais diferenciais
- Best-in-class precision with 350 µA max supply current per amplifier (vs AD8627ARZ)
- Wide supply voltage range (±2.5 V to ±15 V dual or 5 V to 30 V single) (vs AD8626ARZ)
- Pin-compatible scaling to MSOP-8 footprint (vs AD8622ARMZ)
Notas de projeto
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.
Informações de conformidade
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.
