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Analog Devices Inc. AD8223BRM
- Part No.:
- AD8223BRM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8223BRM.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,949
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Product details
Overview
AD8223BRM from Analog Devices is a single-supply, rail-to-rail output instrumentation amplifier with gain set by one external resistor (5–1000 V/V), 30 nV/√Hz input-referred voltage noise at 1 kHz (G = 1000), 25 nA max input bias current, and operation from +3 V to +24 V supply. It enables precision low-power signal conditioning in thermocouple amplifiers and battery-powered medical sensors.
For engineers reviewing the AD8223BRM datasheet, AD8223BRM pinout, AD8223BRM application, or AD8223BRM equivalent, key selection criteria include its 150 mV below negative rail input common-mode range, 500 μA max quiescent current, ±40°C to +85°C operating temperature, and compatibility with SOIC-R and MSOP-RM packages for space-constrained PCB layouts.
Technical Context
The AD8223BRM implements a modified 3-op-amp architecture with PNP input buffers enabling input voltages down to 150 mV below the negative rail and rail-to-rail output swing. Its gain stage uses an external RG resistor across pins 1 and 8 to set gain per G = 5 + (80 kΩ/RG), while the third stage provides fixed ×5 differential gain and common-mode rejection.
Internal ESD-protected clamping diodes allow safe overvoltage tolerance of ±0.3 V beyond supplies on all pins. The REF pin accepts an external reference voltage (−VS to +VS) to level-shift the output, with <5 Ω source impedance recommended to preserve CMRR performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 5 to 1000 V/V - set precisely via single external resistor; no resistor yields G = 5 with minimal drift. |
| Input Voltage Range | (−VS) − 0.15 V to (+VS) − 1.5 V - supports signals 150 mV below ground on single supply. |
| Output Swing | +0.01 V to (+VS) − 0.5 V (RL = 10 kΩ) - rail-to-rail capability maximizes dynamic range at low supply voltages. |
| Supply Current | 500 μA max (TA = 25°C, +VS = +5 V) - enables 1.5 mW power consumption at 3 V, ideal for battery operation. |
| CMRR | 96 dB typical (G = 100, DC–60 Hz) - high rejection ensures accuracy in noisy industrial transducer interfaces. |
| Input Noise | 30 nV/√Hz @ 1 kHz (G = 1000), 0.6 μV p-p (0.1–10 Hz) - low RTI noise preserves SNR in low-level sensor amplification. |
| Bandwidth | 5 kHz (G = 1000), 125 kHz (G = 5) - sufficient for thermocouple, strain gauge, and process control signals. |
Pinout & Package
AD8223BRM is packaged in an 8-lead MSOP (RM) with 0.65 mm pitch, thermal resistance θJA = 200°C/W, and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−RG) | Gain resistor terminal | Connects to one end of external RG; forms gain-setting network with internal 80 kΩ reference. |
| 2 (−IN) | Negative input | Differential input node; accepts signals down to (−VS) − 0.15 V with PNP input stage. |
| 3 (+IN) | Positive input | Differential input node; matched impedance and bias current to −IN for optimal CMRR. |
| 4 (−VS) | Negative supply | Ground reference on single supply; −2 V to −12 V on dual supply; must be decoupled with 0.1 µF + 10 µF. |
| 5 (REF) | Reference input | Output offset reference point; drives ADC mid-supply or level-shifted analog chains; requires low-impedance source. |
| 6 (OUT) | Amplified output | Rail-to-rail voltage output referenced to REF; capable of sourcing/sinking >1 mA into 10 kΩ load. |
| 7 (+VS) | Positive supply | +3 V to +24 V (single) or +2 V to +12 V (dual); decoupling critical for PSRR and noise performance. |
| 8 (+RG) | Gain resistor terminal | Connects to other end of external RG; completes gain-setting path with pin 1 and internal resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain programming | Eliminates trimming and matching components; gain error as low as 0.02% (G = 10) without external resistor tolerance effects. |
| Rail-to-rail output on single supply | Enables full-scale utilization of 3 V–5 V ADCs without level-shifting circuitry or dual supplies. |
| Input common-mode range extended below ground | Supports direct connection to grounded thermocouples or bridge sensors without level-shifting bias networks. |
| Integrated input protection diodes | Withstands ±0.3 V overvoltage relative to supplies during power-up, power-down, or fault conditions-no external clamps needed. |
| Low quiescent current (500 μA) | Reduces self-heating and extends battery life in portable ECG monitors, wearable sensors, and remote data loggers. |
Applications
| Thermocouple Amplifier | Industrial Process Control Sensor Interface |
|---|---|
|
Use Scenario: Amplifying microvolt-level EMF from K-type thermocouples (−200°C to +1350°C) in furnace monitoring systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing stable gain, low drift, and high CMRR against 50/60 Hz line noise. Use Value: 150 mV below-ground input range allows direct grounding of thermocouple cold junction; 30 nV/√Hz noise ensures resolution better than 0.1°C at 1 kHz bandwidth. |
Use Scenario: Conditioning output of 4–20 mA current-loop pressure transducers in PLC analog input modules. IC Role / Device Role / Timing Role: High-input-impedance (2 GΩ||pF) differential amplifier rejecting common-mode noise on long industrial cables. Use Value: 96 dB CMRR at 60 Hz and ±0.3 V input overvoltage tolerance eliminate need for external protection or filtering in harsh factory environments. |
| Portable Medical Instrumentation | Low-Power Data Acquisition System |
|
Use Scenario: Front-end amplification for battery-powered ECG electrodes with sub-μV signal levels and high electrode-skin impedance. IC Role / Device Role / Timing Role: Low-noise, low-bias-current instrumentation amplifier driving SAR ADCs in ultra-low-power wearable devices. Use Value: 25 nA max input bias current minimizes voltage error across 1 MΩ electrode impedances; 500 μA supply current enables multi-day operation on coin-cell batteries. |
Use Scenario: Signal conditioning stage in solar-powered environmental sensor nodes measuring temperature, humidity, and light intensity. IC Role / Device Role / Timing Role: Single-supply instrumentation amplifier interfacing resistive and capacitive sensors to microcontroller ADCs. Use Value: Wide +3 V to +24 V supply range accommodates energy harvesting circuits and supercapacitor storage; rail-to-rail output ensures full ADC code utilization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8221ARMZ | Higher precision (25 μV max VOS, 0.3 μV/°C TC), wider bandwidth (1.3 MHz @ G = 10), but higher supply current (1.2 mA) and no rail-to-rail output. | Better suited for high-speed, high-accuracy lab equipment; not optimal for battery-powered designs requiring rail-to-rail swing. | Select AD8221ARMZ when absolute offset and drift dominate over power and output swing requirements. |
| INA333AIDRGT | Zero-drift architecture (0.02 μV/°C offset drift), lower noise (12 nV/√Hz), but limited common-mode range (to −0.1 V on 3 V supply) and no sub-ground input capability. | Ideal for precision weigh scales and strain gauges where zero-drift matters more than negative common-mode support. | Choose INA333AIDRGT only if sub-ground input is unnecessary and long-term DC stability is critical. |
Compared with AD8223BRM, AD8221ARMZ trades power efficiency and rail-to-rail output for higher speed and lower drift, while INA333AIDRGT sacrifices sub-ground input range to achieve near-zero offset drift-making AD8223BRM uniquely balanced for low-power, wide common-mode industrial and medical sensing.
Availability
AD8223BRM is available at Aetrix Electronics and suitable for thermocouple amplifiers, portable medical instrumentation, and industrial process controls requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for AD8223BRM 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 and manufacturing operations worldwide.
The AD8223 belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, single-supply sensor signal conditioning in medical, industrial, and test equipment where sub-ground input range and rail-to-rail output are essential.
FAQ
What supply voltage range does the AD8223BRM support?
The AD8223BRM operates from a single supply of +3 V to +24 V or dual supplies of ±2 V to ±12 V. At +3 V, it delivers rail-to-rail output swing and consumes only 500 μA, making AD8223BRM ideal for battery-powered applications such as portable ECG monitors and wireless sensor nodes where supply headroom is constrained.
How is gain set on the AD8223BRM?
Gain on the AD8223BRM is set using a single external resistor (RG) connected between pins 1 (−RG) and 8 (+RG), following G = 5 + (80 kΩ/RG). With no external resistor, AD8223BRM defaults to G = 5 with minimal gain error (0.02%) and drift, eliminating calibration overhead in cost-sensitive designs like industrial transducer interfaces.
Does the AD8223BRM support inputs below ground?
Yes, the AD8223BRM supports input common-mode voltages down to (−VS) − 0.15 V - i.e., 150 mV below the negative supply rail. This enables direct connection to grounded thermocouples or bridge sensors without external biasing, a capability confirmed in the AD8223BRM's specifications table and theory-of-operation section.
What is the purpose of the REF pin on the AD8223BRM?
The REF pin on the AD8223BRM sets the output voltage reference level: VOUT = G(VIN+ − VIN−) + VREF. It allows level-shifting the output to match ADC input ranges (e.g., 0.5 V to 4.5 V) or reject common-mode offsets. For best CMRR, the AD8223BRM REF source impedance must remain below 5 Ω, as specified in the pin function descriptions.
Can the AD8223BRM drive low-impedance loads directly?
The AD8223BRM is specified to drive loads ≥10 kΩ. Driving lower impedances (e.g., <1 kΩ) causes output swing compression and increased distortion. For such cases, the AD8223BRM datasheet recommends buffering with a precision op amp like OP113. Direct loading below 10 kΩ is not supported per AD8223BRM's output voltage swing vs. current characterization.
AD8223BRM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 200 kHz
- Current - Input Bias:
- 12 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 650µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 24 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8223BRM FAQ
1.How can I place an order for AD8223BRM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8223BRM 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 AD8223BRM reliable?
The price and inventory of AD8223BRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8223BRM is usually 5 days.
3.What payment methods are accepted for AD8223BRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8223BRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8223BRM?
AD8223BRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8223BRM 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 AD8223BRM?
For technical support, including AD8223BRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8223BRM requirements.
6.How does Aetrix verify that AD8223BRM is sourced from the original manufacturer or authorized distributors?
All AD8223BRM 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 AD8223BRM meets industry standards.
7.What is the process for return or replacement of AD8223BRM?
All AD8223BRM units undergo pre-shipment inspection (PSI). If there is an issue with AD8223BRM, 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 AD8223BRM part is unused and in its original packaging.
Return procedure for AD8223BRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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