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Analog Devices Inc. AD623ANZ
- Part No.:
- AD623ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD623ANZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,099
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Product details
Overview
AD623ANZ from Analog Devices is a single- or dual-supply instrumentation amplifier with rail-to-rail output swing, 800 kHz bandwidth at G = 1, 0.10% gain error (G = 1), and 35 nV/√Hz input voltage noise. It operates from 2.7 V to ±6 V supplies and supports gain programming from 1 to 1000 via one external resistor. It is used in low-power medical instrumentation and thermocouple amplification where precision, low quiescent current (max 550 µA), and extended common-mode range (down to −0.15 V below ground) are critical.
For engineers reviewing the AD623ANZ datasheet, AD623ANZ pinout, AD623ANZ application, or AD623ANZ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in transducer interfaces and industrial process controls, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The AD623ANZ implements a three-op-amp instrumentation architecture with matched internal thin-film resistors enabling high CMRR that improves with gain-reaching 105 dB at G = 100-and maintains >90 dB up to 200 Hz for line-noise rejection. Its input stage accepts common-mode voltages as low as −0.15 V (single supply) or −5.15 V (dual supply), while the output swings rail-to-rail across 10 kΩ loads.
Gain is set by a single external resistor RG connected between pins 1 (−RG) and 8 (+RG), with G = 1 + (100 kΩ / RG). The REF pin (pin 5) sets output common-mode level independently, supporting level-shifting without affecting gain accuracy or offset performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single: 2.7 V to 12 V; Dual: ±2.5 V to ±6 V - enables direct interface with 3.3 V/5 V microcontrollers and legacy ±5 V systems. |
| Gain Accuracy | G = 1: 0.10% max gain error - ensures <1 mV error on 1 V differential input without trimming. |
| Input Voltage Range | Down to −0.15 V below ground (single supply) - allows accurate amplification of signals near or slightly below ground, e.g., thermocouples. |
| Bandwidth | 800 kHz at G = 1 - supports fast-sampling data acquisition up to ~100 kSPS with minimal settling penalty. |
| Quiescent Current | Max 550 µA (dual supply) - enables battery-powered portable medical devices with multi-day operation. |
| CMRR | 100 dB at G = 10, 60 Hz - rejects mains interference in noisy industrial environments without external filtering. |
| RTI Noise | 35 nV/√Hz at 1 kHz - preserves signal integrity in low-level sensor applications like strain gauges and pressure transducers. |
Pinout & Package
AD623ANZ is supplied in an 8-lead PDIP (Plastic Dual In-line Package) with 0.3-inch body width and standard through-hole footprint. Pin spacing is 0.1 inch, compatible with legacy prototyping and industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−RG) | Inverting terminal of external gain-setting resistor | Connects to one end of RG; determines gain with pin 8; open-circuit yields G = 1. |
| 2 (−IN) | Inverting instrumentation amplifier input | Differential input node; high impedance (>2 GΩ) minimizes loading on sensors. |
| 3 (+IN) | Noninverting instrumentation amplifier input | Differential input node; matched to pin 2 for optimal CMRR and offset rejection. |
| 4 (−VS) | Negative supply rail | Accepts ground (single supply) or negative voltage (dual supply); must be decoupled locally. |
| 5 (REF) | Output reference voltage input | Sets DC common-mode level of OUTPUT; can be tied to mid-supply or ADC reference for seamless interfacing. |
| 6 (OUTPUT) | Amplified differential output | Rail-to-rail swing drives 10 kΩ loads directly; no external buffer needed for most 12-bit ADCs. |
| 7 (+VS) | Positive supply rail | Accepts 2.7–12 V (single) or +2.5 to +6 V (dual); low PSRR dependency simplifies supply design. |
| 8 (+RG) | Noninverting terminal of external gain-setting resistor | Connects to other end of RG; gain resolution depends on RG tolerance and tempco. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings within 0.2 V of rails at 10 kΩ load - eliminates need for level-shifting circuitry when driving SAR ADCs. |
| Single-resistor gain programming | G = 1 + (100 kΩ / RG) - reduces BOM count and layout complexity vs. discrete or multi-resistor IAs. |
| Extended input common-mode range | Operates with inputs down to −0.15 V (single supply) - supports grounded-source sensors without level-shifting op amps. |
| Low quiescent current | 550 µA max - enables continuous monitoring in portable ECG or pulse oximeter designs with coin-cell batteries. |
| High CMRR vs. gain | CMRR increases with gain (e.g., 90 dB at G = 10, 105 dB at G = 100) - improves rejection of interference in high-gain transducer stages. |
Applications
| Medical Instrumentation | Transducer Interface |
|---|---|
|
Use Scenario: Amplifying microvolt-level ECG signals from dry electrodes in wearable heart-rate monitors. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing programmable gain (G = 100–500), low noise, and high CMRR to reject motion artifacts and 50/60 Hz interference. Use Value: Enables reliable R-wave detection at <1 µV input with <35 nV/√Hz noise and 100 dB CMRR at 60 Hz, reducing false positives in arrhythmia algorithms. |
Use Scenario: Conditioning output of a 350 Ω strain gauge bridge in industrial load cells. IC Role / Device Role / Timing Role: Differential amplifier rejecting bridge common-mode drift and amplifying small ΔV (±10 mV full scale) with stable gain. Use Value: Delivers 0.10% gain accuracy at G = 100 and 50 ppm nonlinearity - ensures <0.01% FS measurement error without factory calibration. |
| Thermocouple Amplification | Industrial Process Control |
|
Use Scenario: Cold-junction-compensated K-type thermocouple interface in HVAC controllers. IC Role / Device Role / Timing Role: Low-drift IA accepting sub-millivolt inputs and operating with inputs below ground (−0.15 V) during cold-junction compensation. Use Value: Input range extending 150 mV below ground allows direct connection to thermocouple junctions referenced to local ground, eliminating biasing resistors. |
Use Scenario: Signal conditioning for 4–20 mA loop-powered field transmitters in PLC analog input modules. IC Role / Device Role / Timing Role: High-impedance, low-power IA converting loop current to precise voltage while rejecting common-mode noise on long cables. Use Value: 2 GΩ input impedance and 100 dB CMRR at 60 Hz prevent loading and noise pickup on 100+ meter twisted-pair runs in factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8422ARMZ | Lower input bias current (1 nA vs. 25 nA), higher bandwidth (3.5 MHz at G = 1), but requires dual supply for full rail-to-rail output. | Better suited for high-speed, low-offset precision applications (e.g., weigh scales), less ideal for single-supply battery devices due to higher IQ (1.2 mA). | Select AD8422ARMZ when bandwidth >1 MHz and offset <5 µV are required; retain AD623ANZ for cost-sensitive, ultra-low-power, single-supply designs. |
| INA333AIDR | Lower quiescent current (50 µA), integrated RG, but narrower supply range (1.8–5.5 V) and lower CMRR (100 dB at G = 100). | Optimized for 3.3 V IoT sensor nodes; not suitable for ±5 V legacy systems or applications requiring >100 dB CMRR at 60 Hz. | Choose INA333AIDR for compact, low-IQ 3.3 V systems; prefer AD623ANZ when wide supply range, high CMRR, or through-hole assembly is mandatory. |
Compared with AD8422ARMZ and INA333AIDR, the AD623ANZ uniquely balances rail-to-rail output, −0.15 V input capability, and 550 µA max IQ across 2.7–12 V supplies - making it the only option among the three qualified for both single-supply portable medical devices and dual-supply industrial control cards without redesign.
Availability
AD623ANZ is available at Aetrix Electronics and suitable for low-power medical instrumentation, thermocouple amplification, and industrial process controls requiring stable component supply and long-term obsolescence management.
Supply support for AD623ANZ 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.
The AD623 product line was engineered for precision, low-power instrumentation applications demanding rail-to-rail output, single-resistor gain control, and robust noise/CMRR performance in space- and power-constrained systems.
FAQ
What is the maximum gain achievable with AD623ANZ?
The AD623ANZ supports a gain range of 1 to 1000, set by an external resistor RG using the formula G = 1 + (100 kΩ / RG). For G = 1000, RG = 100 Ω is required; stability and thermal drift of RG become critical design considerations at high gains. The AD623ANZ datasheet confirms this range applies to all package variants including AD623ANZ.
Does AD623ANZ require external components for basic operation?
AD623ANZ operates at unity gain (G = 1) with no external components - pins 1 (−RG) and 8 (+RG) are left unconnected. For gains >1, only one precision resistor RG is required. External decoupling capacitors (e.g., 0.1 µF ceramic) on +VS and −VS are recommended but not strictly mandatory for basic functionality per the AD623ANZ datasheet.
Can AD623ANZ operate from a single 3.3 V supply?
Yes, AD623ANZ is fully specified for single-supply operation from 2.7 V to 12 V. At +VS = 3.3 V and −VS = 0 V, it delivers rail-to-rail output swing (0.05 V to 3.15 V at 100 kΩ load) and accepts input common-mode voltages down to −0.15 V - enabling direct interface with grounded-sensor configurations in 3.3 V embedded systems.
What is the input impedance of AD623ANZ?
AD623ANZ features 2 GΩ differential and common-mode input impedance (shunted by ~2 pF), consistent across all gain settings and supply configurations. This high impedance minimizes loading errors on high-output-impedance sources such as thermocouples, piezoelectric sensors, and bridge transducers, preserving signal fidelity without additional buffer stages.
How does the REF pin function in AD623ANZ?
The REF pin (pin 5) of AD623ANZ sets the DC common-mode voltage of the OUTPUT pin. When driven to a fixed voltage (e.g., 1.65 V for 3.3 V systems), it centers the amplified output around that level - enabling direct connection to single-supply ADCs without AC coupling or level-shifting. The AD623ANZ gain and offset performance remain unaffected by REF voltage selection.
AD623ANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 800 kHz
- Current - Input Bias:
- 17 nA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 375µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AD623ANZ FAQ
1.How can I place an order for AD623ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD623ANZ 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 AD623ANZ reliable?
The price and inventory of AD623ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD623ANZ is usually 5 days.
3.What payment methods are accepted for AD623ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD623ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD623ANZ?
AD623ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD623ANZ 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 AD623ANZ?
For technical support, including AD623ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD623ANZ requirements.
6.How does Aetrix verify that AD623ANZ is sourced from the original manufacturer or authorized distributors?
All AD623ANZ 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 AD623ANZ meets industry standards.
7.What is the process for return or replacement of AD623ANZ?
All AD623ANZ units undergo pre-shipment inspection (PSI). If there is an issue with AD623ANZ, 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 AD623ANZ part is unused and in its original packaging.
Return procedure for AD623ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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