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Analog Devices Inc. AD627ARZ
- Part No.:
- AD627ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD627ARZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,951
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Product details
Overview
AD627ARZ from Analog Devices is a micropower, rail-to-rail output instrumentation amplifier with single- and dual-supply operation (±1.1 V to ±18 V or +2.2 V to +36 V), 85 μA max supply current, gain set by one external resistor (5 to 1000), and 80 kHz bandwidth at G = +5 - used in low-power medical ECG/EEG front-ends and 4 mA–20 mA loop receivers.
For engineers reviewing the AD627ARZ datasheet, AD627ARZ pinout, AD627ARZ application, or AD627ARZ equivalent, key selection criteria include micropower consumption (<85 μA), rail-to-rail output swing on 3 V/5 V supplies, input offset voltage ≤125 μV (AD627B grade), CMRR ≥83 dB at 60 Hz, and SOIC_N-8 pin compatibility for space-constrained analog signal conditioning.
Technical Context
The AD627ARZ implements a modified current-feedback architecture with interstage feedforward compensation to maintain high CMRR (>83 dB) up to 200 Hz - critical for rejecting 50/60 Hz line noise in transducer interfaces. Its two-loop internal topology delivers factory-trimmed gain accuracy (0.01%) and enables precise differential amplification without external op-amp matching.
Gain is set via a single external resistor across Pins 1 and 8 per Gain = 5 + (200 kΩ/RG); the REF pin provides level-shifting capability for bipolar signal handling or ground-referenced output. Input impedance is 20 GΩ || 2 pF differential and common-mode, supporting high-Z sensor sources like thermocouples and bridge transducers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single: +2.2 V to +36 V; Dual: ±1.1 V to ±18 V - supports battery-powered and industrial loop-powered systems. |
| Quiescent Current | 60–85 μA - enables multi-year operation on coin-cell batteries in portable instrumentation. |
| Gain Range | 5 (no resistor) to 1000 (with RG) - programmable via single 205 Ω–200 kΩ resistor; no PCB layout changes needed for gain scaling. |
| Input Offset Voltage | ≤125 μV (AD627B, dual supply) - minimizes DC error in precision thermocouple and strain-gauge amplification. |
| CMRR | ≥83 dB at 60 Hz (AD627B) - rejects mains interference in medical and industrial sensor nodes. |
| Bandwidth | 80 kHz at G = +5 - sufficient for ECG waveform fidelity (0.05–150 Hz) with margin for anti-aliasing. |
| Output Swing | Rail-to-rail: within 25 mV of rails (RL = 20 kΩ) - maximizes dynamic range on 3 V microcontroller ADCs. |
Pinout & Package
AD627ARZ is packaged in an 8-lead SOIC_N (R-8) surface-mount package, 3.9 mm × 4.9 mm, 1.25 mm height, with standard industry pinout and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 RG | External gain-setting resistor connection | Resistor placed between Pins 1 and 8 sets gain per Gain = 5 + (200 kΩ/RG); open-circuit = G = 5. |
| 2 −IN | Inverting input terminal | Accepts negative leg of differential sensor signal; high-impedance (20 GΩ) input minimizes loading on bridges/thermocouples. |
| 3 +IN | Non-inverting input terminal | Accepts positive leg of differential sensor signal; matched input structure ensures CMRR integrity. |
| 4 −VS | Negative supply rail | Ground reference in single-supply mode; −1.1 V to −18 V in dual-supply mode. |
| 5 REF | Reference voltage input | Defines output zero point; driven by low-impedance source (e.g., DAC or filtered VCC/2) to shift output baseline. |
| 6 OUTPUT | Differential output voltage node | Delivers rail-to-rail amplified signal referenced to REF; drives 20 kΩ loads directly without buffering. |
| 7 +VS | Positive supply rail | +2.2 V to +36 V (single) or +1.1 V to +18 V (dual); decoupling capacitor required at pin. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 85 μA max supply current enables >10-year battery life in portable ECG monitors using CR2032 cells. |
| Rail-to-rail output stage | Swings within 25 mV of supply rails at RL = 20 kΩ - preserves full ADC input range on 3.3 V microcontrollers. |
| Single-resistor gain programming | Eliminates need for matched resistor networks or trimming; simplifies BOM and reduces layout area vs. discrete IA designs. |
| High CMRR over frequency | 83 dB minimum at 60 Hz (AD627B) - suppresses mains-induced offsets in unshielded industrial sensor wiring. |
| Low input bias current | ≤10 nA max - prevents significant voltage drop across high-impedance thermocouple or pH electrode sources. |
Applications
| 4 mA–20 mA Loop Receiver | Portable ECG Front-End |
|---|---|
Use Scenario: Isolating and amplifying current-loop signals in industrial PLC I/O modules with 24 V supply and minimal power budget. IC Role / Device Role / Timing Role: Instrumentation amplifier converting 4–20 mA loop current to 0–5 V rail-to-rail output referenced to local ground. Use Value: Single-supply operation at 3.3 V and 85 μA quiescent current reduce heat and extend field device battery life while maintaining 83 dB CMRR against noisy plant-floor grounds. | Use Scenario: Amplifying microvolt-level differential ECG signals from dry electrodes in handheld cardiac monitors. IC Role / Device Role / Timing Role: First-stage differential amplifier with G = 100, rejecting common-mode motion artifacts and 50/60 Hz interference. Use Value: 125 μV max input offset and 38 nV/√Hz RTI noise at 1 kHz preserve ST-segment morphology without post-acquisition digital correction. |
| Thermocouple Amplifier | Bridge Transducer Interface |
Use Scenario: Cold-junction-compensated K-type thermocouple measurement in HVAC controllers with wide ambient temperature range. IC Role / Device Role / Timing Role: Precision low-drift IA amplifying µV/°C thermocouple EMF while rejecting millivolt-level common-mode noise from heater elements. Use Value: 1 μV/°C max input offset drift (AD627B) and 20 GΩ input impedance prevent thermal EMF errors and loading-induced gain shift over −40°C to +85°C. | Use Scenario: Reading strain gauge outputs in battery-powered structural health monitoring sensors mounted on bridges or wind turbines. IC Role / Device Role / Timing Role: Low-power IA conditioning Wheatstone bridge output with G = 500 to resolve sub-microstrain resolution under vibration. Use Value: 1000 ppm/°C gain drift spec and 0.01% factory-trimmed gain accuracy ensure calibration stability over multi-year deployments without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8221ARMZ | Higher supply current (350 μA), wider bandwidth (825 kHz at G = 1), lower input offset (25 μV), but requires dual supply for rail-to-rail output. | Better for high-speed data acquisition; unsuitable for coin-cell-powered devices due to 4× higher quiescent current. | Select AD8221ARMZ only when bandwidth >100 kHz and offset <50 μV are mandatory; AD627ARZ remains optimal for ultra-low-power, rail-to-rail, single-supply use cases. |
| INA333AIDR | Lower quiescent current (50 μA), integrated gain resistors (G = 1–1000), same SOIC-8 package, but reduced CMRR (70 dB at 60 Hz) and narrower supply range (+1.8 V to +5.5 V). | Preferred for sub-3.3 V battery systems (e.g., BLE-enabled sensors); less robust in noisy industrial environments. | Choose INA333AIDR for compact, lowest-current designs below 3.3 V; retain AD627ARZ where 83 dB CMRR and ±18 V dual-supply support are required. |
Compared with AD8221ARMZ and INA333AIDR, AD627ARZ uniquely balances micropower (85 μA), rail-to-rail output on 3 V, 83 dB CMRR at 60 Hz, and ±18 V dual-supply flexibility - making it the only option qualified for both portable medical and rugged industrial transducer interfaces without performance trade-offs.
Availability
AD627ARZ is available at Aetrix Electronics and suitable for 4 mA–20 mA loop receivers, portable ECG front-ends, and thermocouple amplifiers requiring stable component supply across automotive, industrial, and medical OEM programs.
Supply support for AD627ARZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD627ARZ belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, high-accuracy sensor signal conditioning in battery-operated and loop-powered systems where dc precision and ac noise rejection are critical.
FAQ
What is the maximum gain achievable with AD627ARZ, and how is it set?
The AD627ARZ achieves a maximum gain of 1000 using an external resistor (RG) connected between Pins 1 and 8, per the formula Gain = 5 + (200 kΩ/RG). With RG = 205 Ω, gain reaches 980.61; open-circuit (no resistor) yields fixed G = 5. The AD627ARZ's internal laser-trimmed resistors ensure 0.01% gain accuracy at G = 5, and gain drift remains stable at −75 ppm/°C for gains >5 when using a matched-TC resistor.
Does AD627ARZ support true rail-to-rail input common-mode range?
No, AD627ARZ does not support rail-to-rail input common-mode voltage. Its specified input voltage range is (−VS) − 0.1 V to (+VS) − 1 V, meaning the upper limit falls 1 V below the positive rail. For example, with +VS = 5 V, maximum input common-mode voltage is +4 V. This limitation arises from the internal input stage topology and must be accounted for in single-supply designs - the AD627ARZ datasheet provides detailed input range constraints in Section "Input Range Limitations in Single-Supply Applications".
What is the difference between AD627ARZ and AD627BRZ?
The AD627ARZ and AD627BRZ share identical pinout, package (SOIC_N-8), and functional architecture, but differ in dc precision specifications. The AD627BRZ offers tighter input offset voltage (≤125 μV vs. ≤200 μV for AD627ARZ), lower offset drift (1 μV/°C vs. 3 μV/°C), and higher CMRR (83 dB min vs. 77 dB min at G = +5). Both operate identically in circuit; AD627BRZ is selected for highest-accuracy applications like laboratory-grade thermocouple measurement, while AD627ARZ meets industrial and portable medical requirements at lower cost.
Can AD627ARZ drive ADC inputs directly without an output buffer?
Yes, AD627ARZ can drive typical SAR and delta-sigma ADC inputs directly. Its output stage delivers rail-to-rail swing into 20 kΩ loads (within 25 mV of rails) and features low output impedance (<1 Ω) - sufficient for driving 10-bit to 16-bit ADCs with sampling capacitors ≤20 pF. For ADCs requiring >100 pF input capacitance or fast settling (e.g., >1 MSPS), a unity-gain buffer (e.g., AD8605) is recommended to prevent gain error and distortion. The AD627ARZ datasheet confirms direct interface capability in "Output Buffering" (Page 17).
Is AD627ARZ qualified for automotive applications?
No, AD627ARZ is not AEC-Q200 qualified or specified for automotive temperature ranges. Its guaranteed operating temperature is −40°C to +85°C, which overlaps with commercial/industrial grades but lacks automotive-specific reliability testing (e.g., HTOL, TC, ESD per AEC standards). For automotive cabin or chassis applications, Analog Devices recommends the AEC-Q100 qualified AD8421 or AD8422 - both offering similar micropower and precision but with extended qualification and enhanced ESD robustness. AD627ARZ remains appropriate for non-automotive industrial and medical systems.
AD627ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.06V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 80 kHz
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 60µA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD627ARZ FAQ
1.How can I place an order for AD627ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD627ARZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD627ARZ reliable?
The price and inventory of AD627ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD627ARZ is usually 5 days.
3.What payment methods are accepted for AD627ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD627ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD627ARZ?
AD627ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD627ARZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD627ARZ?
For technical support, including AD627ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD627ARZ requirements.
6.How does Aetrix verify that AD627ARZ is sourced from the original manufacturer or authorized distributors?
All AD627ARZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD627ARZ meets industry standards.
7.What is the process for return or replacement of AD627ARZ?
All AD627ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD627ARZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD627ARZ part is unused and in its original packaging.
Return procedure for AD627ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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