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Analog Devices Inc. AD620ACHIP
- Part No.:
- AD620ACHIP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- -
- Datasheet:
-
AD620ACHIP.pdf
- Description:
- AD620ACHIPS - LOW POWER INSTRUME
- Quantity:
- Payment:
- Shipping:
Inventory:2,702
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Product details
Overview
AD620ACHIP from Analog Devices is a low-cost, high-accuracy instrumentation amplifier optimized for precision DC-coupled signal conditioning in sensor interfaces and medical instrumentation. It delivers gain of 1–10,000 set by a single external resistor, 50 μV max input offset voltage, 0.6 μV/°C max offset drift, and 1.3 mA max supply current - enabling battery-powered ECG front-ends and weigh-scale transducer amplifiers.
For engineers reviewing the AD620ACHIP datasheet, AD620ACHIP pinout, AD620ACHIP application, or AD620ACHIP equivalent, key selection criteria include its Superβ bipolar input stage (1.0 nA max bias current), 120 kHz bandwidth at G = 100, 15 μs settling time to 0.01%, and compatibility with ±2.3 V to ±18 V dual supplies - all in an 8-lead PDIP package.
Technical Context
The AD620ACHIP implements a monolithic three-op-amp architecture with laser-trimmed internal 24.7 kΩ gain resistors and Superβ input transistors. Its gain equation is G = 1 + 49.4 kΩ/RG, supporting precise programmability across four decades without external op amps or matched resistor networks.
It features a unity-gain subtractor output stage referenced to the REF pin, differential input impedance of 10 GΩ || 2 pF, and RTI noise of 0.28 μV p-p (0.1 Hz to 10 Hz) at G = 100–1000 - making it suitable for low-frequency, high-impedance sources like strain gauges and biopotential electrodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 10,000 - set by single external resistor RG; enables scalable signal conditioning without redesigning feedback networks. |
| Input Offset Voltage | 50 μV max (B grade) - ensures ≤0.25% full-scale error when amplifying 20 mV bridge outputs. |
| Supply Current | 1.3 mA max - supports >100-hour operation on a single AA cell in portable data loggers. |
| Bandwidth | 120 kHz at G = 100 - sufficient for ECG QRS complex capture and industrial process control loop response. |
| Settling Time | 15 μs to 0.01% - meets multiplexed multi-channel DAQ timing requirements with minimal channel crosstalk. |
| CMRR | 100 dB min at G = 10 - rejects common-mode interference from 50/60 Hz mains in unshielded transducer cables. |
| Input Bias Current | 1.0 nA max - prevents significant voltage drop across >1 MΩ source impedances (e.g., dry electrode ECG). |
Pinout & Package
AD620ACHIP is supplied in an 8-lead plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin spacing conforms to JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG terminals | Connect external gain-setting resistor; open-circuit for G = 1; defines transconductance and bandwidth scaling. |
| 2 | −IN | Inverting input; high-impedance node for differential sensor connections; requires matched trace lengths for CMR preservation. |
| 3 | −VS | Negative supply rail; must be decoupled locally with ≥0.1 μF ceramic capacitor to suppress PSR degradation. |
| 4 | +IN | Non-inverting input; symmetrical with −IN; forms precision differential pair with Q1/Q2 Superβ transistors. |
| 5 | REF | Output reference level; sets DC common-mode output voltage; can be driven externally for level-shifting. |
| 6 | OUTPUT | Single-ended amplified output; capable of ±(VS − 1.4 V) swing into 2 kΩ load at ±15 V supplies. |
| 7 | +VS | Positive supply rail; shares same decoupling requirement as −VS; enables rail-to-rail input voltage range compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain programming | Eliminates need for precision resistor networks or trimming; supports production calibration via RG tolerance selection (0.1%–1%). |
| Superβ bipolar input stage | Delivers 1.0 nA max input bias current - 10× lower than standard bipolar IAs - critical for high-Z pH or piezoresistive sensors. |
| Low 0.1–10 Hz noise | 0.28 μV p-p RTI at G ≥ 100 - enables sub-microvolt resolution in static weight measurement without post-acquisition filtering. |
| Laser-trimmed gain resistors | 24.7 kΩ internal R1/R2 trimmed to ±0.05% matching - ensures <0.3% gain error at G = 100 without external calibration. |
| Wide supply range | Operates from ±2.3 V to ±18 V - supports both low-voltage portable systems (±3 V) and industrial ±15 V legacy rails. |
Applications
| ECG Front-End Amplifier | Weigh Scale Transducer Interface |
|---|---|
|
Use Scenario: Amplifying microvolt-level differential signals from Ag/AgCl electrodes with 1 MΩ+ source impedance and 50 Hz common-mode interference. IC Role / Device Role / Timing Role: Primary instrumentation amplifier in first-stage analog signal chain; provides gain, CMR, and DC stability before ADC sampling. Use Value: 1.0 nA max input bias current prevents electrode polarization; 100 dB CMRR rejects mains coupling; 0.28 μV p-p noise preserves ST-segment fidelity. |
Use Scenario: Conditioning mV-level Wheatstone bridge output from load cells in industrial floor scales operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Precision gain block converting 20 mV full-scale bridge output to 2 V full-scale for 12-bit ADC input. Use Value: 50 μV max input offset contributes only 0.25% error at 25°C; 0.6 μV/°C drift adds <36 μV over 60°C span - within 1-LSB budget for 12-bit conversion. |
| Portable Data Acquisition Channel | Pressure Transducer Signal Conditioning |
|
Use Scenario: Multi-channel battery-powered DAQ system acquiring thermocouple, RTD, and strain gauge signals with shared PCB layout. IC Role / Device Role / Timing Role: Per-channel in-amp providing programmable gain and input protection prior to multiplexer and ADC. Use Value: 15 μs settling time allows 66 kSPS per channel; 1.3 mA supply current enables 8-channel operation on 2xAA batteries for >24 hours. |
Use Scenario: Signal conditioning for 3 kΩ silicon piezoresistive pressure sensor powered from 5 V single supply in HVAC monitoring. IC Role / Device Role / Timing Role: Bridge amplifier with REF pin tied to mid-supply to generate ratiometric output referenced to 5 V rail. Use Value: ±2.3 V minimum supply enables direct 5 V single-supply operation; 40 ppm nonlinearity ensures <0.004% FS error across full pressure range. |
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 ±5 V min supply and costs ~2.3× more. | Better suited for laboratory-grade precision systems where offset drift and noise dominate error budgets. | Select AD8221ARMZ when absolute accuracy <10 ppm and CMRR >120 dB are required; AD620ACHIP remains optimal for cost-sensitive portable designs. |
| AD8429ARZ | Ultra-low voltage noise (0.9 nV/√Hz), lower 0.1–10 Hz noise (0.15 μV p-p), but 2.5 mA supply current and SOIC-only packaging. | Targeted at high-resolution seismic or geophysical sensing where nanovolt sensitivity outweighs power constraints. | Choose AD8429ARZ for ultra-low-noise applications above 1 kHz; AD620ACHIP offers superior power/noise trade-off below 1 kHz and in DIP-based prototyping. |
Compared with AD8221ARMZ and AD8429ARZ, the AD620ACHIP provides the best balance of low cost, DIP package availability, sub-1.3 mA quiescent current, and verified performance in battery-powered medical and industrial sensor interfaces - without requiring design compromises in layout or supply architecture.
Availability
AD620ACHIP is available at Aetrix Electronics and suitable for ECG front-end amplifiers, weigh scale transducer interfaces, portable data acquisition channels, and pressure transducer signal conditioning requiring stable component supply and long-term industrial lifecycle support.
Supply support for AD620ACHIP 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 Wilmington, MA.
The AD620 product line was designed specifically for precision, low-power instrumentation amplifier applications - targeting medical diagnostics, industrial process control, and sensor signal conditioning where accuracy, size, and supply efficiency are jointly constrained.
FAQ
What is the maximum gain achievable with AD620ACHIP?
The AD620ACHIP supports a gain range of 1 to 10,000, set by a single external resistor RG using the formula G = 1 + 49.4 kΩ/RG. At G = 10,000, RG = 4.94 Ω - requiring careful layout and low-TC resistor selection to maintain accuracy. The AD620ACHIP maintains 12 kHz small-signal bandwidth and 150 μs settling time to 0.01% at this gain.
Does AD620ACHIP support single-supply operation?
Yes, the AD620ACHIP operates from ±2.3 V to ±18 V dual supplies, and its input common-mode range extends to within 1.9 V of either rail. When used with a single 5 V supply (e.g., +2.5 V and −2.5 V derived from split-rail generator), the AD620ACHIP maintains full functionality - as demonstrated in Analog Devices' Figure 38 pressure monitor circuit.
What is the purpose of the REF pin on AD620ACHIP?
The REF pin on AD620ACHIP sets the output common-mode voltage level. It accepts an external DC voltage (within −VS + 1.6 V to +VS − 1.6 V) to level-shift the output - enabling ratiometric interfacing with ADC references or driving single-supply downstream stages. In most configurations, REF is tied to ground or mid-supply to establish 0 V or VS/2 output baseline.
How does AD620ACHIP achieve low input bias current?
The AD620ACHIP achieves 1.0 nA max input bias current using Superβ bipolar transistor processing in its input stage - a proprietary Analog Devices technique that increases current gain (β) by >10× versus standard bipolar processes. This reduces base current demand while preserving low voltage noise (9 nV/√Hz) and high input impedance (10 GΩ || 2 pF).
Can AD620ACHIP drive a 2 kΩ load effectively?
Yes, the AD620ACHIP specifies output swing of ±(VS − 1.4 V) into a 2 kΩ load at ±15 V supplies - delivering ±13.6 V full-scale output. Its output stage is designed for moderate loads; for heavier loads (<1 kΩ) or capacitive loads (>100 pF), external buffering is recommended to preserve stability and settling performance.
AD620ACHIP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- -
- Number of Circuits:
- -
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- -
- Voltage - Supply Span (Max):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AD620ACHIP FAQ
1.How can I place an order for AD620ACHIP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD620ACHIP 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 AD620ACHIP reliable?
The price and inventory of AD620ACHIP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD620ACHIP is usually 5 days.
3.What payment methods are accepted for AD620ACHIP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD620ACHIP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD620ACHIP?
AD620ACHIP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD620ACHIP 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 AD620ACHIP?
For technical support, including AD620ACHIP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD620ACHIP requirements.
6.How does Aetrix verify that AD620ACHIP is sourced from the original manufacturer or authorized distributors?
All AD620ACHIP 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 AD620ACHIP meets industry standards.
7.What is the process for return or replacement of AD620ACHIP?
All AD620ACHIP units undergo pre-shipment inspection (PSI). If there is an issue with AD620ACHIP, 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 AD620ACHIP part is unused and in its original packaging.
Return procedure for AD620ACHIP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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