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Analog Devices Inc. AD620ARZ
- Part No.:
- AD620ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD620ARZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,377
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Product details
Overview
AD620ARZ from Analog Devices is a low-cost, precision instrumentation amplifier with gain programmable from 1 to 10,000 via a single external resistor (RG), ±2.3 V to ±18 V dual-supply operation, 1.3 mA max supply current, and 50 μV max input offset voltage. It serves as a high-accuracy front-end signal conditioner in bridge-based sensor interfaces requiring low drift, low noise, and stable gain over temperature.
For engineers reviewing the AD620ARZ datasheet, AD620ARZ pinout, AD620ARZ application, or AD620ARZ equivalent, this page delivers verified specifications, validated SOIC-8 pin functions, real-world medical and industrial use cases, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The AD620ARZ implements a monolithic, three-op-amp topology with Superβ bipolar input transistors enabling 1.0 nA max input bias current and 9 nV/√Hz input voltage noise at 1 kHz. Its laser-trimmed internal 24.7 kΩ gain resistors ensure accurate gain setting (±0.30% max error at G = 100) using only RG.
It features a unity-gain subtractor stage referenced to the REF pin, delivering single-ended output with 100 dB min CMRR at G = 10, 120 kHz bandwidth at G = 100, and 15 μs settling time to 0.01% for 10 V steps - optimized for multiplexed data acquisition and battery-powered ECG front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 10,000, set by single external resistor RG - enables flexible signal scaling without redesigning amplifier topology. |
| Input Offset Voltage | 50 μV max (B grade), 125 μV max (A grade) - ensures ≤0.625% full-scale error when amplifying 20 mV bridge outputs. |
| Supply Current | 1.3 mA max at ±15 V - supports >100-hour operation on a 130 mAh coin cell in portable ECG recorders. |
| CMRR | 100 dB min at G = 10, DC–60 Hz with 1 kΩ source imbalance - rejects common-mode interference from 50/60 Hz mains in industrial transducer systems. |
| Bandwidth | 120 kHz at G = 100 - preserves fidelity of fast-rising pressure sensor pulses up to ~19 kHz (−3 dB point). |
| Settling Time | 15 μs to 0.01% for 10 V step - meets throughput requirements of 16-bit SAR ADCs sampling at ≥50 kSPS in multiplexed DAQ. |
| Input Voltage Noise | 9 nV/√Hz @ 1 kHz, 0.28 μV p-p (0.1–10 Hz) - resolves sub-microvolt bio-signals in diagnostic ECG applications. |
Pinout & Package
AD620ARZ is housed in an 8-lead SOIC (R package), 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant, with thermal resistance θJA = 155°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG terminals | Connect external gain-setting resistor; open-circuit for G = 1; determines transconductance and bandwidth scaling. |
| 2 | −IN | Inverting input of differential front-end; high-impedance node (10 GΩ || 2 pF) for bridge or thermocouple sensing. |
| 3 | +IN | Non-inverting input; matched to −IN for <1 nA input bias current and <1 nA offset current. |
| 4 | −VS | Negative supply rail; supports operation down to ±2.3 V - enables single 5 V rail use with level-shifting. |
| 5 | REF | Output reference level; sets DC common-mode output voltage; driven externally for level translation or offset nulling. |
| 6 | OUTPUT | Single-ended amplified output; swings to within 1.2 V of rails at ±15 V, driving 2 kΩ loads. |
| 7 | +VS | Positive supply rail; decoupling required within 1 cm for stability in high-CMRR applications. |
Key Features
| Feature | Design Value |
|---|---|
| One-resistor gain programming | Eliminates trimming potentiometers and matching resistor networks - reduces BOM count and layout area by ≥50% vs. discrete 3-op-amp IAs. |
| Superβ input stage | Delivers 1.0 nA max input bias current at 25°C - enables accurate measurement with high-impedance sources (e.g., 1 MΩ ECG electrodes). |
| Low 0.1–10 Hz noise | 0.28 μV p-p RTI at G = 100 - resolves microvolt-level physiological signals without post-amplification filtering. |
| Laser-trimmed gain resistors | Ensures 0.15% gain error at G = 100 - removes need for system-level calibration in weigh scale OEM production. |
| Wide supply range | Operates from ±2.3 V to ±18 V - supports both low-voltage portable sensors and high-dynamic-range industrial bridges. |
Applications
| Weigh Scales | ECG Monitoring |
|---|---|
Use Scenario: Amplifying mV-level output from 350 Ω strain-gauge bridges in platform scales operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing G = 100 signal conditioning with <7,559 ppm total error at 25°C. Use Value: Replaces discrete 3-op-amp designs, cutting supply current from 15 mA to 1.3 mA and reducing PCB area by 60%. |
Use Scenario: Front-end amplification of 1 mVpp differential ECG signals from dry electrodes with 1 MΩ source impedance. IC Role / Device Role / Timing Role: Low-bias, low-noise IA driving high-pass filter and ADC; settles in 15 μs for multi-channel sampling. Use Value: Enables battery life >100 hours in portable recorders while maintaining diagnostic-grade SNR (>90 dB). |
| Transducer Interface | Data Acquisition Systems |
Use Scenario: Conditioning output of 3 kΩ piezoresistive pressure sensors powered from 5 V single supply in HVAC controllers. IC Role / Device Role / Timing Role: G = 100 signal conditioner with REF pin biased to mid-supply for rail-to-rail ADC interfacing. Use Value: Achieves 14-bit effective resolution without auto-zero cycles due to <40 ppm nonlinearity and low drift. |
Use Scenario: Channel-specific amplification in 16-channel industrial DAQ modules acquiring 0–10 V sensor inputs. IC Role / Device Role / Timing Role: Multiplexed IA with 15 μs settling time - supports 50 kSPS aggregate throughput at 16-bit accuracy. Use Value: Eliminates per-channel op-amp matching and trim components, reducing channel-to-channel gain mismatch to <0.3%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8221ARMZ | Lower input offset (25 μV max), higher CMRR (130 dB min at G = 100), but requires dual supply and has 2.5 mA supply current. | Better for high-precision lab equipment where offset drift dominates error budget; less suitable for battery-powered devices. | Select AD8221ARMZ when absolute accuracy at G ≥ 100 outweighs power constraints. |
| AD8226ARMZ | Wider input voltage range (to ±VS), lower supply current (0.35 mA), but higher input noise (22 nV/√Hz) and reduced CMRR (90 dB at G = 100). | Optimized for wide-supply industrial sensors (e.g., 24 V systems) with relaxed noise requirements. | Select AD8226ARMZ for cost-sensitive, low-power 24 V transducer interfaces where 12-bit resolution suffices. |
Compared with AD620ARZ, AD8221ARMZ improves dc accuracy at the expense of 92% higher quiescent current, while AD8226ARMZ trades noise and CMRR for ultra-low power and rail-to-rail input - making AD620ARZ the balanced choice for 14-bit, battery-operated, medium-speed DAQ.
Availability
AD620ARZ is available at Aetrix Electronics and suitable for weigh scales, ECG monitors, transducer interfaces, and industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD620ARZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.
The AD620 belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-drift, low-noise signal conditioning in sensor front-ends where accuracy, size, and power efficiency are critical.
FAQ
What is the maximum gain achievable with AD620ARZ?
The AD620ARZ supports a gain range of 1 to 10,000, set by the external resistor RG using the formula G = 1 + (49.4 kΩ / RG). At G = 10,000, RG = 4.94 Ω - requiring a precision, low-TC resistor and careful PCB layout to minimize parasitic series resistance. The AD620ARZ maintains 12 kHz small-signal bandwidth and 150 μs settling time at this gain.
Can AD620ARZ operate from a single 5 V supply?
Yes, AD620ARZ can operate from a single 5 V supply when the REF pin is biased to 2.5 V and input signals remain within the specified common-mode range (−VS + 1.9 V to +VS − 1.4 V). In this configuration, the AD620ARZ delivers rail-to-rail output swing capability and is used in 5 V pressure monitor circuits with total supply current under 4 mA.
What is the purpose of the REF pin on AD620ARZ?
The REF pin on AD620ARZ sets the output common-mode voltage. It accepts an external DC voltage (e.g., mid-supply or ADC reference) and adds it directly to the amplified differential signal. This allows level-shifting for single-supply ADC interfacing and active offset nulling - a key feature distinguishing AD620ARZ from fixed-reference instrumentation amplifiers.
How does AD620ARZ achieve low input bias current?
AD620ARZ achieves 1.0 nA max input bias current using Superβ bipolar transistor processing in its input stage, which increases current gain (β) by 10× over standard processes. This reduces base current requirements without sacrificing speed or noise - enabling accurate amplification of high-impedance sources like ECG electrodes and piezoelectric sensors.
Is AD620ARZ pin-compatible with other AD620 variants?
Yes, AD620ARZ shares identical SOIC-8 pinout and electrical characteristics with AD620ANZ (PDIP) and AD620BRZ (SOIC, B-grade). All variants use the same connection diagram, gain equation, and thermal footprint - allowing direct substitution in existing layouts when upgrading accuracy or temperature range.
AD620ARZ 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:
- -
- Slew Rate:
- 1.2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 900µA
- Current - Output / Channel:
- 18 mA
- Voltage - Supply Span (Min):
- 4.6 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD620ARZ FAQ
1.How can I place an order for AD620ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD620ARZ 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 AD620ARZ reliable?
The price and inventory of AD620ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD620ARZ is usually 5 days.
3.What payment methods are accepted for AD620ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD620ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD620ARZ?
AD620ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD620ARZ 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 AD620ARZ?
For technical support, including AD620ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD620ARZ requirements.
6.How does Aetrix verify that AD620ARZ is sourced from the original manufacturer or authorized distributors?
All AD620ARZ 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 AD620ARZ meets industry standards.
7.What is the process for return or replacement of AD620ARZ?
All AD620ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD620ARZ, 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 AD620ARZ part is unused and in its original packaging.
Return procedure for AD620ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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