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Analog Devices Inc. AD8227BRMZ
- Part No.:
- AD8227BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8227BRMZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:226
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Product details
Overview
AD8227BRMZ from Analog Devices is a rail-to-rail output instrumentation amplifier with gain set by a single external resistor (5–1000 V/V), 250 kHz bandwidth at G = 5, 100 dB minimum CMRR (B grade), 24 nV/√Hz input voltage noise, and operation from ±1.5 V to ±18 V or 2.2 V to 36 V single supply. It enables precision amplification of low-level bridge sensor signals in industrial process controls and portable data acquisition systems.
For engineers reviewing the AD8227BRMZ datasheet, AD8227BRMZ pinout, AD8227BRMZ application, or AD8227BRMZ equivalent, this page delivers verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts for multichannel, space-constrained designs requiring wide supply range and input voltage below ground.
Technical Context
The AD8227BRMZ implements a classic three-op-amp architecture: first-stage preamplifier establishes differential gain via current through RG, while second-stage difference amplifier removes common-mode voltage and provides fixed ×5 gain. Its pnp-input stage allows input voltages to extend 0.1 V below −VS, enabling ground-referenced signal amplification without dual supplies.
Input overvoltage protection supports ±35 V tolerance with ±5 V supplies; reference input has 60 kΩ impedance and 12 μA bias current; quiescent current is 350 μA typical at +25°C. Specified from −40°C to +125°C, it targets high-reliability embedded sensing where thermal stability and rail-to-rail output swing are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 5 to 1000 V/V, set by single external resistor RG - simplifies design and reduces BOM count vs. fixed-gain alternatives. |
| CMRR (G = 5) | 100 dB min (B grade, DC–60 Hz) - rejects interference in noisy industrial environments with unbalanced source impedances. |
| Bandwidth (G = 5) | 250 kHz - supports dynamic strain gauge or pressure transducer measurements up to ~39 kHz full-power bandwidth. |
| Input Voltage Noise | 24 nV/√Hz at 1 kHz - enables resolution of µV-level signals from low-output sensors without excessive filtering. |
| Supply Range | ±1.5 V to ±18 V dual or 2.2 V to 36 V single - powers directly from 3.3 V, 5 V, 12 V, or 24 V rails without LDOs. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive, motor control, and industrial edge nodes. |
| Output Swing | Rail-to-rail into 10 kΩ load (−VS + 0.2 V to +VS − 0.2 V, −40°C to +85°C) - maximizes dynamic range in low-voltage ADC interfaces. |
Pinout & Package
AD8227BRMZ is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts and zero-airflow thermal environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative Input | Differential input node; accepts signals down to −VS − 0.1 V - enables amplification of sub-ground bridge outputs. |
| 2, 3 (RG) | Gain Setting Terminals | Connect external resistor between these pins to set gain per G = 5 + (80 kΩ/RG); open-circuit defaults to G = 5. |
| 4 (+IN) | Positive Input | Differential input node; matched impedance and bias current to −IN for optimal CMRR performance. |
| 5 (−VS) | Negative Supply | Reference for internal biasing; supports dual-supply operation or ground reference in single-supply configurations. |
| 6 (REF) | Reference Input | Low-impedance-driven node (60 kΩ || 12 μA) that offsets output: VOUT = G×(V+IN − V−IN) + VREF. |
| 7 (VOUT) | Amplified Output | Rail-to-rail output capable of sourcing/sinking 13 mA - drives ADC inputs, filters, or level-shifting stages directly. |
| 8 (+VS) | Positive Supply | Primary power rail; supports wide input common-mode range when combined with −VS or ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain programming | Eliminates need for precision matched resistor networks - reduces layout sensitivity and calibration complexity. |
| Input voltage below negative rail | Operates with VIN as low as −VS − 0.15 V at −40°C - enables direct connection to grounded Wheatstone bridges. |
| Robust input protection | Withstands ±35 V input overvoltage with ±5 V supplies - protects against ESD, wiring faults, and transient coupling. |
| High-temp rated MSOP | 125°C operational rating in 8-lead MSOP - supports dense packaging in thermally constrained enclosures. |
| Low quiescent current | 350 μA typical at +25°C - extends battery life in portable data loggers and wireless sensor nodes. |
Applications
| Industrial Process Control | Bridge Amplifier |
|---|---|
|
Use Scenario: Monitoring temperature, pressure, or flow via 4-wire RTD or strain gauge in PLC analog input modules. IC Role / Device Role / Timing Role: Instrumentation amplifier conditioning low-level differential sensor outputs before 16-bit SAR ADC sampling. Use Value: 100 dB CMRR suppresses 50/60 Hz line noise; rail-to-rail output ensures full utilization of ADC reference voltage. |
Use Scenario: Amplifying mV-level output from load cell or pressure transducer in weighing scale or HVAC duct sensor. IC Role / Device Role / Timing Role: Precision gain stage converting bridge imbalance to clean, referenced voltage for microcontroller ADC. Use Value: Input range extending below ground eliminates need for negative supply; 24 nV/√Hz noise preserves signal integrity. |
| Medical Instrumentation | Portable Data Acquisition |
|
Use Scenario: Signal conditioning in patient-worn ECG front-end or respiration monitor with dry electrodes. IC Role / Device Role / Timing Role: Low-noise, low-power instrumentation amplifier capturing biopotential signals with high common-mode rejection. Use Value: 350 μA supply current enables multi-channel battery operation; 125°C rating supports sterilization-compatible PCB layouts. |
Use Scenario: Compact field-deployable sensor node measuring vibration, acoustic emission, or environmental parameters. IC Role / Device Role / Timing Role: Single-supply (3.3 V or 5 V) signal conditioner interfacing MEMS or piezoresistive sensors to low-power MCU. Use Value: Wide 2.2–36 V supply range accommodates varied battery chemistries; MSOP footprint saves board area in handheld enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8226ARMZ | Gain range 1–1000 V/V; lower CMRR (90 dB min at G = 5); same MSOP-8 package and pinout. | Supports unity-gain configurations unsuitable for AD8227BRMZ; less suitable for high-noise industrial settings. | Select AD8226ARMZ only if G = 1 is required; otherwise AD8227BRMZ offers superior noise and CMRR at identical cost and footprint. |
| INA333AIDRGT | Zero-drift architecture; 0.02 µV/°C offset drift; 50 nV/√Hz input noise; 5 V max supply; SOT-23-8 package. | Better DC precision but higher noise and narrower supply range; not rated beyond +85°C. | Choose INA333AIDRGT for ultra-low drift in battery-powered medical devices; AD8227BRMZ preferred for wide-temp, wide-supply, low-noise industrial use. |
Compared with AD8226ARMZ and INA333AIDRGT, AD8227BRMZ uniquely balances wide supply range (2.2–36 V), −40°C to +125°C operation, 24 nV/√Hz noise, and 100 dB CMRR - making it optimal for ruggedized, multichannel sensor signal chains where thermal stability and supply flexibility are non-negotiable.
Availability
AD8227BRMZ is available at Aetrix Electronics and suitable for industrial process controls, bridge amplifier circuits, and portable data acquisition systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for AD8227BRMZ 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 AD8227 belongs to Analog Devices' precision instrumentation amplifier product line, designed specifically for robust, low-cost signal conditioning of millivolt-level sensor outputs in harsh industrial and portable environments.
FAQ
What is the minimum gain setting for AD8227BRMZ, and how is it configured?
The AD8227BRMZ has a minimum gain of 5 V/V, achieved by leaving pins 2 and 3 (RG) unconnected. This default configuration requires no external resistor and is factory-verified. Gain scaling above 5 is implemented by placing a precision resistor between RG pins per the formula G = 5 + (80 kΩ/RG). The AD8227BRMZ does not support gains below 5.
Can AD8227BRMZ operate with input signals below ground, and what is the limit?
Yes, AD8227BRMZ supports input voltages below the negative supply rail: down to −VS − 0.15 V at −40°C, −VS − 0.1 V at +25°C, and −VS − 0.05 V at +125°C. This capability enables direct amplification of grounded bridge sensors without level-shifting circuitry, a key advantage over conventional op-amp-based instrumentation amplifiers.
What is the maximum input overvoltage the AD8227BRMZ can withstand without damage?
The AD8227BRMZ is rated to withstand ±35 V at its input terminals relative to the supplies - for example, with ±5 V supplies, it tolerates −30 V to +40 V on −IN or +IN. This is specified in Absolute Maximum Ratings (Table 4) and validated across temperature. Exceeding these limits risks permanent damage.
Does AD8227BRMZ require external capacitors for stability, and what load capacitance is supported?
No external compensation capacitor is required for stability with resistive loads. The AD8227BRMZ remains stable with up to 100 pF capacitive load (RL = 10 kΩ), as shown in Figure 55. For larger capacitive loads, series resistance ≥10 Ω is recommended at the output to maintain phase margin - a design consideration explicitly documented in the datasheet's Layout section.
How does the reference input (REF) affect the output equation of AD8227BRMZ?
The REF pin directly offsets the output per the transfer function VOUT = G × (V+IN − V−IN) + VREF. It presents 60 kΩ input impedance and 12 μA bias current, requiring a low-impedance drive (e.g., op-amp buffer or precision DAC). Incorrect REF drive impedance degrades CMRR and introduces gain error - a critical layout requirement for high-accuracy applications using AD8227BRMZ.
AD8227BRMZ 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:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.8V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 250 kHz
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 350µA
- Current - Output / Channel:
- 13 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8227BRMZ FAQ
1.How can I place an order for AD8227BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8227BRMZ 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 AD8227BRMZ reliable?
The price and inventory of AD8227BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8227BRMZ is usually 5 days.
3.What payment methods are accepted for AD8227BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8227BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8227BRMZ?
AD8227BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8227BRMZ 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 AD8227BRMZ?
For technical support, including AD8227BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8227BRMZ requirements.
6.How does Aetrix verify that AD8227BRMZ is sourced from the original manufacturer or authorized distributors?
All AD8227BRMZ 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 AD8227BRMZ meets industry standards.
7.What is the process for return or replacement of AD8227BRMZ?
All AD8227BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8227BRMZ, 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 AD8227BRMZ part is unused and in its original packaging.
Return procedure for AD8227BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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