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Analog Devices Inc. AD8227BRZ
- Part No.:
- AD8227BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8227BRZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:251
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Product details
Overview
AD8227BRZ from Analog Devices is a rail-to-rail output instrumentation amplifier designed for precision signal conditioning in low-power, wide-supply industrial and medical systems. It delivers gain of 5–1000 set by a single external resistor, features ±1.5 V to ±18 V (or 2.2 V–36 V single) supply operation, 250 kHz bandwidth at G = 5, 100 dB minimum CMRR, and operates across −40°C to +125°C - enabling use in bridge sensor interfaces and portable data acquisition.
For engineers reviewing the AD8227BRZ datasheet, AD8227BRZ pinout, AD8227BRZ application, or AD8227BRZ equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for multichannel, space-constrained designs requiring high common-mode rejection and input voltage range extending below negative rail.
Technical Context
The AD8227BRZ implements a classic three-op-amp architecture with pnp-input front-end stages, enabling input voltages to extend 0.1 V below −VS while maintaining robust overvoltage tolerance (±35 V with ±5 V supplies). Its gain-setting network uses two dedicated RG pins (Pins 2 & 3) to establish precise gain via external resistor, with internal 80 kΩ reference yielding G = 5 + (80 kΩ/RG).
Output stage delivers rail-to-rail swing into 10 kΩ loads (−VS + 0.2 V to +VS − 0.2 V at −40°C to +85°C), and reference input (Pin 6) provides direct offset adjustment with 1 V/V gain and 0.01% gain error. Input bias current flows *into* both inputs (pnp-based), with typical value of 20 nA at +25°C and <35 nA over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 5 to 1000, set by single external resistor between Pins 2 and 3 - enables flexible system-level scaling without redesign. |
| Supply Range | ±1.5 V to ±18 V dual or 2.2 V to 36 V single - supports battery-powered and industrial rail systems without level-shifting. |
| CMRR (G = 5) | ≥100 dB (B Grade, DC–60 Hz) - rejects noise from bridge sensors and long-line transducers in noisy environments. |
| Bandwidth (G = 5) | 250 kHz - sufficient for 50/60 Hz industrial monitoring plus harmonics up to ~10 kHz. |
| Input Voltage Range | Extends to −VS − 0.15 V at −40°C - allows amplification of near-ground signals (e.g., strain gage outputs) on single supply. |
| Quiescent Current | 350 μA typical at +25°C - enables multichannel deployment in power-sensitive portable instrumentation. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive sensing, motor control feedback, and industrial PLC modules. |
Pinout & Package
AD8227BRZ is housed in an 8-lead SOIC package (body width 3.9 mm, JEDEC MS-012), with thermal resistance θJA = 121°C/W on 4-layer board. Pin layout follows standard SOIC orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative input terminal | Differential input node; accepts signals down to −VS − 0.15 V - critical for single-supply bridge amplifier configurations. |
| 2, 3 (RG) | Gain-setting resistor terminals | Connect external resistor between these pins to set gain; open-circuit defaults to G = 5 - no pull-up/down required. |
| 4 (+IN) | Positive input terminal | Differential input node; matched impedance and bias behavior to Pin 1 - ensures balanced common-mode rejection. |
| 5 (−VS) | Negative supply rail | Reference for internal pnp input stage; must be connected even in single-supply mode (e.g., tied to ground). |
| 6 (REF) | Reference input | DC offset injection point with 1 V/V gain and 60 kΩ input impedance - enables level-shifting output to ADC input range. |
| 7 (VOUT) | Amplified output | Rail-to-rail output capable of driving 10 kΩ loads within 200 mV of rails - reduces need for external buffer in 12-bit+ data acquisition. |
| 8 (+VS) | Positive supply rail | Primary power connection; supports up to +36 V - compatible with 24 V industrial bus and 12 V automotive systems. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain programming | Eliminates trimming or multiple external components - simplifies BOM and improves production yield in sensor modules. |
| Input overvoltage protection | Withstands ±35 V input with ±5 V supply - protects against transients in industrial field wiring without external clamping diodes. |
| Low input bias current drift | 70 pA/°C max over −40°C to +125°C - minimizes offset shift in high-impedance thermopile or pH sensor interfaces. |
| Wide common-mode input range | Operates with VCM from −VS − 0.15 V to +VS − 0.9 V - accommodates unbalanced bridge outputs and floating sensor grounds. |
| Specified performance at 125°C | Full electrical specs guaranteed to +125°C - enables placement in thermally dense enclosures (e.g., motor drive PCBs) without derating. |
Applications
| Bridge Amplifier | Portable Data Acquisition |
|---|---|
|
Use Scenario: Amplifying low-level differential output from a 350 Ω Wheatstone bridge strain gage in a load cell, powered from a 3.3 V LDO. IC Role / Device Role / Timing Role: Instrumentation amplifier providing fixed G = 100, rejecting common-mode noise from shared ground paths and EMI. Use Value: Input range extending to −0.15 V below ground enables full-scale bridge output capture without dual supply - reducing system cost and board area. |
Use Scenario: Signal conditioning front-end for a handheld multimeter sampling thermocouple and RTD inputs via multiplexed ADC. IC Role / Device Role / Timing Role: Low-power, rail-to-rail output IA delivering stable gain and CMRR across battery voltage decay (3.6 V → 2.2 V). Use Value: 350 μA quiescent current and −40°C to +125°C rating allow continuous operation during extended field measurements without thermal shutdown. |
| Industrial Process Control | Medical Instrumentation |
|
Use Scenario: Isolated 4–20 mA loop receiver conditioning sensor output before analog isolation and microcontroller ADC sampling. IC Role / Device Role / Timing Role: Precision IA referenced to isolated ground, rejecting common-mode noise induced by long cable runs and motor drives. Use Value: 100 dB CMRR at 50/60 Hz ensures accurate current-loop interpretation despite 50 Vpp common-mode interference on factory floor. |
Use Scenario: Front-end amplifier for ECG electrode signals in a wearable patch monitor using coin-cell battery and 16-bit SAR ADC. IC Role / Device Role / Timing Role: Low-noise (24 nV/√Hz), low-drift IA rejecting motion artifact and power-line interference in dry-electrode interface. Use Value: Input bias current <35 nA at −40°C prevents electrode polarization errors - critical for stable baseline in multi-hour ambulatory recordings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8226ARZ | Gain range 1–1000 (vs. 5–1000); lower CMRR (90 dB min at G=5); same SOIC-8 package and pinout. | Supports unity-gain configurations for sensor buffering; less suitable for high-precision bridge measurement where >95 dB CMRR is required. | Select AD8226ARZ only when G = 1 is needed; otherwise AD8227BRZ provides superior CMRR and input voltage range. |
| INA333AIDRGT | Zero-drift architecture; 0.02 μV/°C offset drift (vs. 0.2 μV/°C); higher quiescent current (50 μA vs. 350 μA); 8-pin VSSOP package. | Better for DC-critical applications like precision weight scales; not drop-in due to different pinout and higher supply current. | Choose INA333AIDRGT for ultra-low drift requirements; AD8227BRZ remains preferred for wide-temp, low-power, and overvoltage-tolerant designs. |
Compared with AD8226ARZ, AD8227BRZ offers 10 dB higher CMRR and extended input range below negative rail - critical for industrial bridge sensors. Against INA333AIDRGT, AD8227BRZ trades zero-drift performance for 7× lower supply current and proven ±35 V overvoltage survival - making it more robust in harsh, battery-limited environments.
Availability
AD8227BRZ is available at Aetrix Electronics and suitable for industrial process controls, portable data acquisition, and medical instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD8227BRZ 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, engineered for high-accuracy, low-power signal conditioning in harsh environments - particularly targeting bridge-based sensors, portable test equipment, and industrial control systems.
FAQ
What is the minimum supply voltage required for AD8227BRZ operation?
The AD8227BRZ operates down to 2.2 V on single supply or ±1.5 V on dual supply. At 2.2 V, it maintains full functionality including rail-to-rail output swing and specified gain accuracy. This enables direct integration with Li-ion battery systems (2.5–4.2 V range) and low-voltage industrial controllers without boost regulation.
Can AD8227BRZ be used with a single-ended reference voltage?
Yes - the REF pin (Pin 6) accepts any DC voltage between −VS and +VS, with 1 V/V gain and 0.01% gain error. For example, applying 1.65 V to REF centers the AD8227BRZ output at mid-supply for direct interfacing with a 3.3 V ADC. The 60 kΩ input impedance requires a low-impedance source (<100 Ω) to avoid gain error.
Does AD8227BRZ require external capacitors for stability?
No external compensation is required for AD8227BRZ. It is internally compensated and stable driving resistive loads up to 10 kΩ. With capacitive loads >100 pF, a small series resistor (≤10 Ω) at the output is recommended per Figure 55 in the datasheet to prevent peaking - but no bypass or phase-compensation caps are needed on supply or REF pins.
How does the AD8227BRZ handle input overvoltage conditions?
The AD8227BRZ input stage withstands ±35 V beyond the supply rails (e.g., ±35 V with ±5 V supplies) without damage or latch-up. This is achieved via integrated ESD and overvoltage protection circuitry shown in Figure 58. No external protection diodes are required for typical industrial transients - reducing bill-of-materials and PCB area.
What is the impact of RG resistor tolerance on overall system gain accuracy?
System gain error is the root-sum-square of AD8227BRZ's intrinsic gain error (0.04% at G = 5) and the external RG resistor's tolerance and tempco. For example, using a 1% 25 ppm/°C resistor adds ~1.001% total error at room temperature - so RG selection directly determines achievable system-level accuracy in precision measurement applications.
AD8227BRZ 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:
- 0.8V/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-SOIC
AD8227BRZ FAQ
1.How can I place an order for AD8227BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8227BRZ 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 AD8227BRZ reliable?
The price and inventory of AD8227BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8227BRZ is usually 5 days.
3.What payment methods are accepted for AD8227BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8227BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8227BRZ?
AD8227BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8227BRZ 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 AD8227BRZ?
For technical support, including AD8227BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8227BRZ requirements.
6.How does Aetrix verify that AD8227BRZ is sourced from the original manufacturer or authorized distributors?
All AD8227BRZ 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 AD8227BRZ meets industry standards.
7.What is the process for return or replacement of AD8227BRZ?
All AD8227BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8227BRZ, 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 AD8227BRZ part is unused and in its original packaging.
Return procedure for AD8227BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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