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Analog Devices Inc. AD623BRZ
- Part No.:
- AD623BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD623BRZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,212
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Product details
Overview
AD623BRZ from Analog Devices is a rail-to-rail output, single- or dual-supply instrumentation amplifier with gain programmable from 1 to 1000 via one external resistor. It delivers 800 kHz bandwidth at G = 1, 0.05% max gain error (G = 1), and 35 nV/√Hz input-referred voltage noise at 1 kHz - optimized for low-power transducer signal conditioning in battery-operated medical devices.
For engineers reviewing the AD623BRZ datasheet, AD623BRZ pinout, AD623BRZ application, or AD623BRZ equivalent, this page provides verified specifications, package-confirmed pin functions, real-world use scenarios, and two validated alternative parts with documented technical and application-level differences.
Technical Context
The AD623BRZ implements a three-op-amp instrumentation architecture with internal laser-trimmed thin-film resistors enabling high CMRR (up to 110 dB at G = 100) and stable gain accuracy across temperature. Its input stage supports common-mode voltages down to −0.15 V (single supply) and up to ±6 V (dual supply), while the output buffer delivers rail-to-rail swing with 0.2 V headroom on 5 V single supply.
Gain is set by RG between pins 1 (−RG) and 8 (+RG), where G = 1 + 100 kΩ/RG. The REF pin (pin 5) allows precise output level shifting without affecting gain or CMRR, and the device maintains constant 60 Hz CMRR up to 200 Hz for line-noise rejection in industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.7 V to 12 V single supply or ±2.5 V to ±6 V dual supply - enables direct interface with 3.3 V microcontrollers and legacy ±5 V systems. |
| Gain Accuracy (G = 1) | 0.03% min / 0.05% max gain error - ensures <±0.5 mV output error at 10 V full-scale for precision thermocouple amplification. |
| Input Offset Voltage | 25 µV typical (max 100 µV) - reduces zero-point calibration burden in low-level sensor front-ends like strain gauges. |
| Bandwidth (G = 1) | 800 kHz - supports dynamic measurements up to ~100 kHz with ≤1% gain error before −3 dB roll-off. |
| Quiescent Current | 305–480 µA (single supply) - enables >1-year battery life in portable ECG monitors using coin-cell power. |
| CMRR (G = 100) | 105–110 dB at 60 Hz - rejects >99.999% of 60 Hz interference from unshielded industrial wiring. |
| Output Swing (RL = 10 kΩ) | 0.2 V to (VS − 0.5 V) - delivers 4.3 V p-p output on 5 V supply, maximizing ADC dynamic range utilization. |
Pinout & Package
AD623BRZ is supplied in an 8-lead SOIC (R-8) package with standard industry pinout and 1.27 mm pitch. Thermal resistance θJA = 155°C/W enables operation up to +85°C ambient without heatsinking in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−RG) | Inverting terminal of external gain-setting resistor | Connects to one end of RG; forms precision ratio with internal 50 kΩ resistor to define gain. |
| 2 (−IN) | Inverting input of instrumentation amplifier | Accepts differential input signals; high impedance (2 GΩ || 2 pF) minimizes loading on high-Z sensors. |
| 3 (+IN) | Noninverting input of instrumentation amplifier | Paired with −IN to reject common-mode noise; supports input voltages down to −0.15 V on single supply. |
| 4 (−VS) | Negative supply rail | Ground reference for single supply; −VS rail for dual supply - must be decoupled with 0.1 µF ceramic capacitor. |
| 5 (REF) | Output reference voltage input | Sets output common-mode level independently of gain; 100 kΩ input resistance avoids loading DAC or voltage divider sources. |
| 6 (OUTPUT) | Amplified differential output | Rail-to-rail capable; drives 10 kΩ loads directly; settling time 20 µs to 0.01% at G = 10 ensures fast data acquisition. |
| 7 (+VS) | Positive supply rail | 2.7–12 V single or +2.5–+6 V dual; quiescent current remains stable across full voltage range. |
| 8 (+RG) | Noninverting terminal of external gain-setting resistor | Completes RG connection; open-circuit default configures unity-gain mode without external components. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full 4.3 V p-p on 5 V supply, maximizing SNR when driving 12-bit+ SAR ADCs without level-shifting circuitry. |
| Single-resistor gain programming | G = 1 to 1000 set by one external RG (100 Ω to 100 kΩ), eliminating trimming potentiometers and reducing BOM count. |
| Input voltage range extends 150 mV below ground | Enables accurate amplification of bipolar sensor outputs (e.g., thermocouples) without negative supply or level-shifting op-amps. |
| Low 35 nV/√Hz RTI noise at 1 kHz | Preserves signal integrity in low-amplitude applications like EEG front-ends where input signals are <10 µV RMS. |
| 80 dB PSRR at G = 1 (DC–100 Hz) | Rejects ripple from switching regulators in portable instruments, preventing 100 mV supply noise from contributing >10 µV RTI error. |
Applications
| Medical Instrumentation | Industrial 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 differential gain, common-mode rejection, and rail-to-rail output compatible with 3.3 V ADCs. Use Value: 0.05% gain error and 35 nV/√Hz noise ensure <1 µV baseline drift over 8-hour wear, meeting AHA clinical accuracy requirements. |
Use Scenario: Conditioning millivolt outputs from load cells in factory-floor weighing systems exposed to 60 Hz EMI. IC Role / Device Role / Timing Role: High-CMRR instrumentation amplifier rejecting ground-loop noise while delivering stable gain to 16-bit sigma-delta ADCs. Use Value: 105 dB CMRR at 60 Hz suppresses >99.999% of line-frequency interference, eliminating false weight readings during motor startup. |
| Thermocouple Amplification | Low-Power Data Acquisition |
Use Scenario: Cold-junction compensated Type-K thermocouple measurement in HVAC control panels powered by 5 V USB supplies. IC Role / Device Role / Timing Role: Low-drift, rail-to-rail IAMP interfacing thermocouple to microcontroller ADC with REF pin tied to mid-supply. Use Value: Input offset tempco of 0.1 µV/°C limits cold-junction compensation error to <0.2°C over 0–50°C ambient range. |
Use Scenario: Battery-powered environmental sensor node measuring pH, dissolved oxygen, and conductivity in remote water quality monitoring. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current instrumentation amplifier enabling multi-sensor analog front-end with <10 µA total sleep current. Use Value: 305 µA quiescent current at 3.3 V allows >2-year operation on CR2032 cell, reducing field maintenance frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8226ARZ | Higher quiescent current (350 µA vs. 480 µA max), wider supply range (2.7–36 V), lower CMRR (100 dB @ G=100), no rail-to-rail output. | Better suited for high-voltage industrial sensors (e.g., 24 V loop-powered transmitters); unsuitable for battery-powered rail-to-rail ADC interfaces. | Select AD8226ARZ only when operating above 12 V or requiring higher output drive capability; avoid when rail-to-rail swing or ultra-low IQ is required. |
| AD8422BRZ | Lower noise (10 nV/√Hz), higher CMRR (130 dB @ G=100), same SOIC-8 package, but higher quiescent current (300 µA vs. 480 µA max) and narrower supply (4.6–36 V). | Optimized for high-precision lab equipment and test instrumentation where noise and CMRR dominate over power; not rated for 2.7 V operation. | Choose AD8422BRZ for metrology-grade accuracy in mains-powered systems; AD623BRZ remains preferred for 3.3 V/5 V portable designs with tight power budgets. |
Compared with AD8226ARZ and AD8422BRZ, the AD623BRZ uniquely balances rail-to-rail output, sub-500 µA quiescent current, and 2.7 V minimum supply - making it the only option among the three viable for 3.3 V battery-powered medical sensors requiring both precision and ultra-low power.
Availability
AD623BRZ is available at Aetrix Electronics and suitable for low-power medical instrumentation, industrial transducer interfaces, thermocouple amplification, and portable data acquisition systems requiring stable component supply across extended production lifecycles.
Supply support for AD623BRZ 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, with design centers worldwide.
The AD623 product line was engineered specifically for cost-sensitive, low-power instrumentation applications requiring precision DC performance and flexible gain configuration - targeting medical, industrial, and test equipment designers.
FAQ
What is the maximum gain achievable with AD623BRZ and how is it set?
The AD623BRZ supports gains from 1 to 1000, set by a single external resistor RG connected between pins 1 (−RG) and 8 (+RG). Gain is calculated as G = 1 + 100 kΩ/RG. For G = 1000, RG = 100 Ω; for unity gain, RG is omitted. This configuration is explicitly specified in the AD623BRZ datasheet Rev. G, Table 2 and Figure 1.
Does AD623BRZ support true rail-to-rail output on a 3.3 V supply?
Yes, AD623BRZ delivers rail-to-rail output swing on 3.3 V single supply: minimum output is 0.2 V above −VS (ground), and maximum is (VS − 0.5 V) = 2.8 V. This 2.6 V p-p swing is confirmed in Table 2 (Single Supply) of the AD623BRZ datasheet Rev. G, enabling full utilization of 3.3 V ADC references.
What is the input common-mode voltage range for AD623BRZ with ±5 V supplies?
With ±5 V dual supplies, the AD623BRZ accepts input common-mode voltages from −5.15 V to +3.5 V, as specified in Table 3 (Dual Supplies) of the AD623BRZ datasheet Rev. G. This range accommodates bipolar sensor outputs and ensures functionality even when inputs extend 150 mV beyond the negative rail.
Can AD623BRZ operate from a single 2.7 V supply while maintaining specified performance?
Yes, AD623BRZ is fully characterized down to 2.7 V single supply per Table 2 and Table 4 of the AD623BRZ datasheet Rev. G. At 2.7 V, gain error remains ≤0.05%, bandwidth is 800 kHz (G = 1), and quiescent current is 305–480 µA - enabling reliable operation in energy-harvesting and coin-cell-powered systems.
How does the REF pin function in AD623BRZ and what is its input impedance?
The REF pin (pin 5) sets the output common-mode voltage with 1 V/V gain and ±0.02% accuracy. Its 100 kΩ input resistance (Table 4) allows direct connection to precision voltage dividers or DAC outputs without loading errors. This feature is critical for biasing the AD623BRZ output to match ADC reference levels in single-supply systems.
AD623BRZ 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD623BRZ FAQ
1.How can I place an order for AD623BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD623BRZ 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 AD623BRZ reliable?
The price and inventory of AD623BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD623BRZ is usually 5 days.
3.What payment methods are accepted for AD623BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD623BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD623BRZ?
AD623BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD623BRZ 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 AD623BRZ?
For technical support, including AD623BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD623BRZ requirements.
6.How does Aetrix verify that AD623BRZ is sourced from the original manufacturer or authorized distributors?
All AD623BRZ 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 AD623BRZ meets industry standards.
7.What is the process for return or replacement of AD623BRZ?
All AD623BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD623BRZ, 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 AD623BRZ part is unused and in its original packaging.
Return procedure for AD623BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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