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Analog Devices Inc. AD620BRZ
- Part No.:
- AD620BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD620BRZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,533
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Product details
Overview
AD620BRZ from Analog Devices is a low-cost, high-accuracy instrumentation amplifier with gain set by a single external resistor (1–10,000), ±2.3 V to ±18 V dual supply operation, 1.3 mA max quiescent current, and 50 μV max input offset voltage - ideal for precision bridge-based transducer signal conditioning in portable ECG monitors and industrial weigh scales.
For engineers reviewing the AD620BRZ datasheet, AD620BRZ pinout, AD620BRZ application, or AD620BRZ equivalent, this page delivers verified specifications, validated SOIC-8 package mapping, confirmed medical and industrial use cases, and two rigorously cross-checked alternative parts with documented functional trade-offs.
Technical Context
The AD620BRZ implements a monolithic three-op-amp architecture with Superβeta 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 programming via 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, and achieves 120 kHz bandwidth at G = 100 with 15 μs settling time to 0.01% - optimized for multiplexed data acquisition and battery-powered medical front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 10,000, set by single external resistor RG - eliminates need for matched resistor networks or multiple op amps. |
| Input Offset Voltage | 50 μV max (B grade), enabling <1 ppm full-scale error in 50 mV bridge outputs - critical for weigh scale linearity. |
| Supply Current | 1.3 mA max at ±15 V - supports >100-hour battery life in portable ECG recorders using coin-cell or AA supplies. |
| CMRR | 100 dB min at G = 10 (DC–60 Hz, 1 kΩ source imbalance) - rejects common-mode interference from 50/60 Hz mains in clinical environments. |
| Bandwidth | 120 kHz at G = 100 - sufficient for ECG QRS complex capture (≤100 Hz) and pressure sensor step response without phase lag. |
| Settling Time | 15 μs to 0.01% for 10 V step - enables high-channel-count multiplexed DAQ systems with ≥50 kSPS effective throughput. |
| Input Voltage Noise | 9 nV/√Hz @ 1 kHz and 0.28 μV p-p (0.1–10 Hz) - preserves SNR in microvolt-level biopotential signals like ECG ST segments. |
Pinout & Package
AD620BRZ is housed in an 8-lead SOIC (R) package (5.0 mm × 6.2 mm, 1.27 mm pitch), RoHS-compliant, with standard JEDEC MS-012AC footprint and 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 first-stage differential pair - accepts negative leg of Wheatstone bridge or sensor output. |
| 3 | +IN | Non-inverting input of first-stage differential pair - accepts positive leg of bridge; high-impedance (10 GΩ || 2 pF). |
| 4 | −VS | Negative power supply rail - supports down to ±2.3 V, enabling single 5 V supply operation with level-shifting. |
| 5 | OUTPUT | Single-ended amplified output referenced to REF pin - drives ADC inputs or downstream filters directly. |
| 6 | REF | Output reference level setting node - tied to mid-supply for bipolar output swing or AGND for unipolar systems. |
| 7 | +VS | Positive power supply rail - decoupling capacitor required within 1 cm for stability in noisy industrial environments. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain programming | Eliminates trimming and matching overhead; supports production-ready designs with 0.15% gain error at G = 100. |
| Superβeta input stage | Delivers 1.0 nA max input bias current - reduces voltage error across high-Z sources (e.g., 1 MΩ ECG electrodes). |
| Low 0.1–10 Hz noise | 0.28 μV p-p RTI at G = 100 - avoids baseline wander masking ST-segment shifts in diagnostic ECG. |
| Wide supply range | Operates from ±2.3 V to ±18 V - accommodates legacy ±15 V industrial rails and modern low-voltage battery systems. |
| Laser-trimmed internal resistors | Ensures 40 ppm max nonlinearity over full output swing - meets Class III medical device accuracy requirements. |
Applications
| ECG Signal Conditioning | Weigh Scale Front-End |
|---|---|
|
Use Scenario: Amplifying microvolt-level differential signals from Ag/AgCl electrodes on human chest, rejecting 50/60 Hz common-mode interference in clinical or ambulatory settings. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing programmable gain (G = 100–500), DC-coupled signal path, and REF-referenced output for 16-bit ADC interfacing. Use Value: 1.0 nA max input bias current prevents electrode polarization drift; 0.28 μV p-p 0.1–10 Hz noise preserves ST-segment fidelity for arrhythmia detection. |
Use Scenario: Conditioning mV-level output from 350 Ω strain-gauge bridges in platform scales or industrial load cells operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Low-drift, low-noise in-amp with G = 100–1000, driven by stable excitation voltage, feeding sigma-delta ADC with auto-zero calibration. Use Value: 50 μV max input offset and 0.6 μV/°C drift limit temperature-induced zero-error to <30 ppm over full range - meets OIML R76 Class III accuracy. |
| Pressure Transducer Interface | Battery-Powered Data Logger |
|
Use Scenario: Amplifying output of 3 kΩ piezoresistive pressure sensors powered from 5 V single supply in HVAC or medical ventilator control systems. IC Role / Device Role / Timing Role: Single-supply compatible instrumentation amplifier with REF pin biased to VCC/2, enabling rail-to-rail output swing into ADC reference domain. Use Value: 1.3 mA max supply current allows continuous 5 V operation for >1 week on two AA alkaline cells; 120 kHz bandwidth captures dynamic pressure events. |
Use Scenario: Low-power analog front-end in remote environmental sensors logging temperature, humidity, and vibration over months on coin-cell batteries. IC Role / Device Role / Timing Role: Always-on signal conditioner with shutdown-capable design (via supply sequencing), driving SAR ADC only during wake-up intervals. Use Value: 0.9 mA typical quiescent current extends shelf life; SOIC-8 package enables compact PCB layout with minimal decoupling capacitance (100 nF ceramic). |
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 at G = 100), but requires dual supply and has 2.5 mA supply current. | Better suited for high-precision lab equipment where power is not constrained; less optimal for battery longevity. | Select AD8221ARMZ when absolute offset and drift performance outweigh power budget limits - especially in benchtop DAQ. |
| AD8421ARMZ | Ultra-low noise (3.5 nV/√Hz), higher bandwidth (1.2 MHz at G = 100), but 3.5 mA supply current and no SOIC-8 option (only MSOP-8). | Ideal for high-frequency sensor interfaces (e.g., acoustic emission), but incompatible with legacy SOIC footprints. | Choose AD8421ARMZ for demanding low-noise, wideband applications where PCB redesign is acceptable and power is secondary. |
Compared with AD620BRZ, AD8221ARMZ offers tighter DC specs at higher current cost, while AD8421ARMZ delivers superior AC performance in a smaller package - making AD620BRZ the optimal balance of precision, power, and SOIC-8 compatibility for cost-sensitive medical and industrial designs.
Availability
AD620BRZ is available at Aetrix Electronics and suitable for ECG monitor development, industrial weigh scale production, and battery-powered data logger manufacturing requiring stable component supply and long-term lifecycle support.
Supply support for AD620BRZ 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 and ISO 9001-certified manufacturing.
The AD620BRZ belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, high-accuracy sensor signal conditioning in medical diagnostics, industrial automation, and portable test equipment.
FAQ
What is the maximum gain achievable with AD620BRZ, and how is it set?
The AD620BRZ supports a gain range of 1 to 10,000, set by a single external resistor (RG) connected between Pins 1 and 8. For G = 10,000, RG = 4.94 Ω is required; for G = 1, Pins 1 and 8 remain unconnected. The gain equation is G = 1 + (49.4 kΩ / RG). AD620BRZ maintains ≤0.7% gain error across this range under specified conditions.
Does AD620BRZ support single-supply operation?
Yes, AD620BRZ operates from ±2.3 V to ±18 V dual supplies, but can be configured for single-supply use (e.g., +5 V and GND) by biasing the REF pin to mid-supply (e.g., 2.5 V) and ensuring input common-mode voltage stays within −VS + 1.9 V to +VS − 1.4 V. The AD620BRZ datasheet Figure 38 demonstrates a working 5 V single-supply pressure monitor circuit.
What is the input bias current specification for AD620BRZ, and why does it matter?
AD620BRZ specifies 1.0 nA max input bias current (B grade) at 25°C, enabled by Superβeta processing. This ultra-low value minimizes voltage drop across high-impedance sources - such as ECG electrodes (>1 MΩ) or high-value potentiometric sensors - preventing signal attenuation and baseline instability that would degrade measurement accuracy.
How does AD620BRZ compare to discrete three-op-amp instrumentation amplifier designs?
AD620BRZ replaces discrete three-op-amp IAs with monolithic integration, reducing board area by >50%, cutting supply current from ~15 mA to 1.3 mA max, and improving gain accuracy (0.15% vs. >1% typical), CMRR (100 dB vs. ~80 dB), and temperature drift. Its laser-trimmed resistors eliminate manual calibration, accelerating time-to-market for medical and industrial products using AD620BRZ.
Is AD620BRZ pin-compatible with other members of the AD620 family?
Yes, AD620BRZ shares identical 8-lead SOIC (R) pinout and electrical behavior with AD620ARZ and AD620ANZ (DIP), differing only in grade-specific parameters: AD620BRZ guarantees 50 μV max input offset and 0.6 μV/°C drift (B grade), while AD620ARZ (A grade) specifies 125 μV max offset. All variants use the same PCB footprint and gain-setting methodology.
AD620BRZ 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:
- 15 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
AD620BRZ FAQ
1.How can I place an order for AD620BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD620BRZ 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 AD620BRZ reliable?
The price and inventory of AD620BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD620BRZ is usually 5 days.
3.What payment methods are accepted for AD620BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD620BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD620BRZ?
AD620BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD620BRZ 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 AD620BRZ?
For technical support, including AD620BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD620BRZ requirements.
6.How does Aetrix verify that AD620BRZ is sourced from the original manufacturer or authorized distributors?
All AD620BRZ 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 AD620BRZ meets industry standards.
7.What is the process for return or replacement of AD620BRZ?
All AD620BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD620BRZ, 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 AD620BRZ part is unused and in its original packaging.
Return procedure for AD620BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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