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Analog Devices Inc. AD620AN
- Part No.:
- AD620AN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD620AN.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,151
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Product details
Overview
AD620AN 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 - used as a precision front-end for bridge-based transducers in industrial weighing and medical ECG signal conditioning.
For engineers reviewing the AD620AN datasheet, AD620AN pinout, AD620AN application, or AD620AN equivalent, key selection criteria include its Superβ-input stage enabling 1.0 nA max input bias current, 120 kHz bandwidth at G = 100, 15 μs settling time to 0.01%, and 8-lead PDIP package compatibility with legacy PCB layouts.
Technical Context
The AD620AN implements a monolithic three-op-amp architecture with laser-trimmed internal 24.7 kΩ gain resistors and Superβ bipolar input transistors, delivering 0.6 μV/°C max input offset drift and 100 dB min CMRR at G = 10. Its gain-setting node (Pins 1 & 8) directly controls transconductance, enabling bandwidth scaling with gain - 12 kHz at G = 1000 and 120 kHz at G = 100.
It features a dedicated REF pin for output level shifting, 20 kΩ input impedance per input, and rail-to-rail common-mode input range (−VS + 1.9 V to +VS − 1.4 V), with built-in ESD diodes on all pins and 100% tested input protection up to ±25 V differential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 10,000, set by single external resistor RG between Pins 1 and 8 - enables precise, low-component-count gain configuration without trimming networks. |
| Input Offset Voltage | 50 μV max (B grade), referred to input - ensures ≤0.25% full-scale error in 20 mV bridge applications without auto-zero circuitry. |
| Supply Current | 1.3 mA max at ±15 V - supports battery-powered portable ECG recorders and remote sensor nodes with multi-year runtime. |
| Bandwidth | 120 kHz at G = 100 - sufficient for 50/60 Hz industrial process monitoring and DC–100 Hz biomedical waveform acquisition. |
| Settling Time | 15 μs to 0.01% for 10 V step - enables multiplexed data acquisition at ≥50 kSPS with channel-to-channel crosstalk suppression. |
| CMRR | 100 dB min at G = 100, DC–60 Hz with 1 kΩ source imbalance - rejects mains interference in unshielded industrial transducer wiring. |
| Input Bias Current | 1.0 nA max - minimizes voltage drop across high-impedance sources (e.g., 1 MΩ ECG electrodes), preserving signal integrity. |
Pinout & Package
AD620AN is housed in an 8-lead plastic DIP (PDIP) package, 0.300-inch wide, with through-hole mounting and industry-standard footprint compatible with legacy analog signal chains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | RG (Gain Set) | External resistor connection node; gain = 1 + (49.4 kΩ / RG); open-circuit for G = 1. |
| 2 | −IN | Inverting input terminal; accepts differential signal referenced to common-mode voltage. |
| 3 | +IN | Non-inverting input terminal; high-impedance (10 GΩ || 2 pF) Superβ bipolar input. |
| 4 | −VS | Negative supply rail; supports operation down to ±2.3 V; must be decoupled locally. |
| 5 | REF | Reference input; sets output DC level; driven externally or tied to ground for zero-referenced output. |
| 6 | OUTPUT | Single-ended amplified output; swing limited to −VS + 1.2 V to +VS − 1.4 V at ±15 V supply. |
| 7 | +VS | Positive supply rail; same voltage magnitude as −VS for symmetric operation. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain programming | Eliminates matched resistor networks and trim pots - reduces BOM count and layout area by >50% vs. discrete 3-op-amp IAs. |
| Superβ input stage | Enables 1.0 nA max input bias current at 25°C - critical for accurate amplification of high-Z sensors (e.g., piezoresistive pressure bridges). |
| Low 0.1–10 Hz noise | 0.28 μV p-p RTI at G = 100 - preserves microvolt-level ECG T-wave morphology without post-processing filtering. |
| Laser-trimmed gain resistors | Ensures 0.15% gain error at G = 100 - enables direct 16-bit ADC interfacing without digital calibration in weigh scale systems. |
| Wide supply range | Operates from ±2.3 V to ±18 V - supports both low-voltage portable designs (±3 V) and industrial ±15 V systems without redesign. |
Applications
| Weigh Scales | ECG Monitoring |
|---|---|
|
Use Scenario: Amplifying mV-level output from 350 Ω full-bridge load cells in platform scales operating over −40°C to +85°C. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing G = 100 with <7,500 ppm total error budget including drift and nonlinearity. Use Value: Enables 14-bit effective resolution without auto-zero cycles, reducing MCU firmware complexity and power consumption. |
Use Scenario: Front-end amplification of 1 mVpp biopotential signals from dry-electrode ECG leads in ambulatory recorders. IC Role / Device Role / Timing Role: Low-bias, low-noise IA with 15 μs settling time - supports 500 SPS sampling while rejecting 50 Hz common-mode interference. Use Value: Maintains diagnostic fidelity of ST-segment morphology due to 0.28 μV p-p 0.1–10 Hz noise and 100 dB CMRR. |
| Transducer Interface | Battery-Powered Data Acquisition |
|
Use Scenario: Signal conditioning for 3 kΩ silicon pressure transducers powered from 5 V single supply in HVAC sensors. IC Role / Device Role / Timing Role: Dual-supply IA operated on split ±3 V rails derived from charge pump - delivers 1.3 mA total supply current. Use Value: Extends battery life to >2 years in wireless sensor nodes while maintaining <0.1% gain error over temperature. |
Use Scenario: Channel-isolated analog front-end in 8-channel portable DAQ with multiplexed inputs and 16-bit SAR ADC. IC Role / Device Role / Timing Role: Fast-settling IA with 15 μs to 0.01% - allows full 8-channel scan at 10 kSPS without inter-channel ghosting. Use Value: Eliminates need for external settling delay logic or oversampling, simplifying timing control in FPGA-based DAQ controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8221ARZ | Lower input offset (25 μV max), higher CMRR (130 dB at G = 100), but requires ±5 V min supply and costs ~2× more. | Better suited for laboratory-grade precision measurement where 0.01% absolute accuracy is mandatory. | Select AD8221ARZ when sub-25 ppm offset drift and 130 dB CMRR outweigh cost and supply constraints. |
| AD8226ARMZ | Wider input voltage range (up to ±27 V), lower power (0.35 mA), but higher noise (15 nV/√Hz) and reduced bandwidth (35 kHz at G = 100). | Ideal for high-voltage industrial sensor interfaces (e.g., 24 V loop-powered transmitters) with relaxed noise requirements. | Choose AD8226ARMZ for 24 V systems requiring ultra-low quiescent current and extended common-mode range. |
Compared with AD8221ARZ and AD8226ARMZ, the AD620AN offers the optimal balance of cost, 8-lead DIP compatibility, 1.3 mA power, and 120 kHz bandwidth - making it the preferred choice for volume industrial and medical OEM designs where legacy footprint and BOM cost are decisive.
Availability
AD620AN is available at Aetrix Electronics and suitable for weigh scales, ECG monitors, transducer interface modules, and battery-powered data acquisition systems requiring stable component supply and long-term obsolescence management.
Supply support for AD620AN 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 AD620AN belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, high-accuracy signal conditioning in industrial sensing and medical diagnostics - not general-purpose op amp use.
FAQ
What is the maximum gain achievable with the AD620AN using an external resistor?
The AD620AN supports gains from 1 to 10,000 via external resistor RG connected between Pins 1 and 8. At G = 10,000, RG = 4.94 Ω is required; however, practical implementation limits maximum stable gain to ~5,000 due to noise and bandwidth trade-offs. The AD620AN datasheet specifies 10,000 as the theoretical upper limit under ideal conditions.
Can the AD620AN operate from a single 5 V supply?
No - the AD620AN requires dual supplies (±2.3 V to ±18 V) and does not support true single-supply operation. For 5 V systems, a charge pump or DC-DC converter must generate split ±2.5 V rails. The AD620AN's input common-mode range extends to within 1.9 V of each rail, so ±2.5 V supplies enable usable input range of −0.6 V to +0.6 V.
What is the purpose of the REF pin on the AD620AN?
The REF pin on the AD620AN sets the DC level of the output voltage. When grounded, the output is centered at 0 V for bipolar signals. It can be driven by a DAC, filtered reference, or resistor divider to shift output into the optimal range of a downstream ADC. The AD620AN's REF input has 20 kΩ impedance and accepts voltages from −VS + 1.6 V to +VS − 1.6 V.
How does the AD620AN compare to discrete three-op-amp instrumentation amplifier designs?
The AD620AN replaces discrete three-op-amp IAs with superior performance: 10× lower supply current (1.3 mA vs. 15 mA), 50% smaller PCB area, 0.15% gain error at G = 100 (vs. >1% typical for discrete), and guaranteed matching of internal resistors. Its monolithic construction eliminates thermal tracking errors inherent in discrete solutions.
Is the AD620AN RoHS compliant and lead-free?
Yes - the AD620AN (N-suffix) is a Pb-free, RoHS-compliant 8-lead PDIP package, with lead finish specified as matte tin (Sn) over copper. Analog Devices confirms full compliance with EU RoHS Directive 2011/65/EU and China RoHS, with material declarations available upon request.
AD620AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AD620AN FAQ
1.How can I place an order for AD620AN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD620AN 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 AD620AN reliable?
The price and inventory of AD620AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD620AN is usually 5 days.
3.What payment methods are accepted for AD620AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD620AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD620AN?
AD620AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD620AN 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 AD620AN?
For technical support, including AD620AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD620AN requirements.
6.How does Aetrix verify that AD620AN is sourced from the original manufacturer or authorized distributors?
All AD620AN 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 AD620AN meets industry standards.
7.What is the process for return or replacement of AD620AN?
All AD620AN units undergo pre-shipment inspection (PSI). If there is an issue with AD620AN, 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 AD620AN part is unused and in its original packaging.
Return procedure for AD620AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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