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Analog Devices Inc. AD8221BRZ-R7
- Part No.:
- AD8221BRZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8221BRZ-R7.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,043
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Product details
Overview
AD8221BRZ-R7 from Analog Devices is a precision instrumentation amplifier in an 8-lead SOIC package, delivering 90 dB minimum CMRR (G = 1), 25 µV max input offset voltage, and 8 nV/√Hz input voltage noise at 1 kHz - optimized for bridge sensor signal conditioning in industrial weigh scales and medical transducer interfaces.
For engineers reviewing the AD8221BRZ-R7 datasheet, AD8221BRZ-R7 pinout, AD8221BRZ-R7 application, or AD8221BRZ-R7 equivalent, this page provides verified specifications, real-world use cases, pin-level design meaning, and validated alternative options for high-accuracy analog front-end design.
Technical Context
The AD8221BRZ-R7 implements a laser-trimmed 3-op-amp topology with superbeta input transistors and integrated IB compensation, enabling 100 GΩ || 2 pF input impedance and <0.4 nA max input bias current. Its gain is set by a single external resistor (G = 1 + 49.4 kΩ/RG), supporting 1–1000 V/V range with ≤0.02% gain error (BR grade, G = 1).
It maintains ≥80 dB CMRR up to 10 kHz at G = 1 - a key differentiator versus legacy in-amps whose CMRR rolls off above 200 Hz - and delivers 825 kHz −3 dB bandwidth (G = 1), 2 V/µs slew rate, and 0.25 µVp-p 0.1 Hz–10 Hz RTI noise, making it suitable for low-frequency, high-dynamic-range measurements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 to 1000 V/V, set by single external resistor - enables flexible scaling without redesigning signal chain. |
| CMRR (G = 1) | 90 dB min (DC–60 Hz), 80 dB min at 10 kHz - rejects line harmonics and wideband interference without external filtering. |
| Input Offset Voltage | 25 µV max at 25°C - ensures sub-0.1% error in ±10 V bridge output measurement at unity gain. |
| Input Voltage Noise | 8 nV/√Hz @ 1 kHz, 0.25 µVp-p (0.1–10 Hz) - preserves resolution in low-frequency strain gage and thermopile applications. |
| Supply Range | ±2.3 V to ±18 V - supports operation from low-voltage battery systems to industrial ±15 V rails. |
| Bandwidth (G = 1) | 825 kHz −3 dB - enables accurate amplification of fast transient signals in precision data acquisition. |
| Operating Temp | −40°C to +85°C specified performance; functional to +125°C - qualified for harsh industrial and automotive under-hood environments. |
Pinout & Package
AD8221BRZ-R7 is housed in an 8-lead SOIC package (JEDEC MS-012AA, 5.0 mm × 6.2 mm × 1.75 mm), with standard lead pitch (1.27 mm) and RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative Input Terminal | High-impedance differential input node; must be matched to +IN for optimal CMRR - trace length and layout symmetry critical. |
| 2, 3 (RG) | Gain Setting Terminals | Resistor connection points for gain programming; shorting pins sets G = 1; parasitic inductance here directly degrades high-frequency CMRR. |
| 4 (+IN) | Positive Input Terminal | Complementary high-Z input; paired with −IN to form fully differential input stage - sensitive to PCB contamination and ESD. |
| 5 (−VS) | Negative Power Supply | Return path for internal bias currents; requires local 0.1 µF ceramic bypass capacitor to minimize PSRR degradation. |
| 6 (REF) | Reference Voltage Input | Output is referenced to this pin; driving with low-impedance source (e.g., DAC or filtered supply) enables level-shifting into ADC input range. |
| 7 (VOUT) | Amplified Output | Capacitive load >100 pF requires series R (10–50 Ω) to prevent oscillation; drives 2 kΩ load with full swing. |
| 8 (+VS) | Positive Power Supply | Primary supply rail; shares thermal path with die substrate - thermal vias recommended for >1 mA quiescent current stability. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistors | Enables 90 dB CMRR (G = 1) and <0.02% gain error - eliminates need for manual calibration in production test. |
| Superbeta input transistors | Delivers 0.4 nA max input bias current and <0.3 µV/°C offset drift - critical for high-impedance sensor interfaces like pH electrodes. |
| Current-feedback architecture | Maintains usable bandwidth at high gains (e.g., 14.7 kHz at G = 1000) - avoids traditional gain-bandwidth trade-off of voltage-feedback in-amps. |
| Balanced RG pinout | Adjacent RG pins reduce parasitic asymmetry - sustains 80 dB CMRR to 10 kHz, unlike older layouts where RG routing degraded AC rejection. |
| Wide supply range | Operates from ±2.3 V to ±18 V - supports single-supply (e.g., +5 V with REF = +2.5 V) and dual-rail configurations without external level shifters. |
Applications
| Bridge Amplifier | Precision Data Acquisition |
|---|---|
|
Use Scenario: Amplifying mV-level outputs from full-bridge load cells in industrial weighing systems with ±0.01% linearity requirement. IC Role / Device Role / Timing Role: Primary signal-conditioning stage converting differential bridge voltage to single-ended, rail-compatible output for 24-bit sigma-delta ADC. Use Value: 25 µV max VOS and 0.25 µVp-p 0.1–10 Hz noise ensure <1 LSB error in 20-bit effective resolution systems. |
Use Scenario: Front-end for portable battery-powered data loggers measuring temperature, pressure, and strain across multiple channels. IC Role / Device Role / Timing Role: Programmable-gain instrumentation amplifier enabling dynamic range optimization per sensor type without hardware change. Use Value: Single-resistor gain setting (1–1000) and ±2.3 V min supply allow ultra-low-power operation while maintaining 825 kHz bandwidth at G = 1. |
| Medical Transducer Interface | Strain Gage Signal Conditioning |
|
Use Scenario: Isolating and amplifying biopotential signals from ECG/EMG electrodes in clinical-grade patient monitors. IC Role / Device Role / Timing Role: First-stage amplifier rejecting 50/60 Hz common-mode interference before further filtering and digitization. Use Value: 80 dB CMRR maintained to 10 kHz eliminates need for aggressive notch filters - preserves signal integrity and reduces phase distortion. |
Use Scenario: Conditioner for quarter-bridge strain gages mounted on structural test specimens under cyclic mechanical loading. IC Role / Device Role / Timing Role: High-precision differential amplifier compensating for lead-wire resistance and ambient temperature drift. Use Value: 0.3 µV/°C max offset drift and 100 GΩ input impedance minimize thermal EMF errors and loading effects on high-Z gage elements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8421ARMZ | Higher bandwidth (10 MHz at G = 1), lower noise (5.9 nV/√Hz), but 30 µV max VOS and no MSOP option in BR grade. | Better suited for high-speed, wide-dynamic-range applications (e.g., aerospace telemetry); less optimal for ultra-low-offset DC bridge systems. | Select AD8421ARMZ when bandwidth >1 MHz or noise <6 nV/√Hz is required; retain AD8221BRZ-R7 for lowest offset and proven industrial reliability. |
| INA128UA | Lower cost, wider supply (±2.25 V to ±18 V), but 125 µV max VOS, 100 dB CMRR only to 100 Hz, and 1.5 V/µs slew rate. | Acceptable for general-purpose industrial monitoring where 0.1% accuracy suffices; not viable for medical or metrology-grade requirements. | Choose INA128UA for cost-sensitive, non-critical applications; AD8221BRZ-R7 remains preferred for <0.01% total error budgets and 10 kHz CMRR compliance. |
Compared with AD8221BRZ-R7, AD8421ARMZ trades offset precision for speed and noise performance, while INA128UA sacrifices CMRR bandwidth and dc accuracy for cost - making AD8221BRZ-R7 the optimal balance for high-fidelity, low-frequency sensor interfaces requiring guaranteed 90 dB CMRR and 25 µV VOS.
Availability
AD8221BRZ-R7 is available at Aetrix Electronics and suitable for industrial process controls, precision weigh scales, and medical instrumentation requiring stable component supply across multi-year production cycles.
Supply support for AD8221BRZ-R7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD8221BRZ-R7 belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for demanding sensor signal conditioning in industrial, medical, and test equipment where dc accuracy, noise, and CMRR over frequency are critical.
FAQ
What is the maximum operating temperature for AD8221BRZ-R7?
The AD8221BRZ-R7 operates over −40°C to +125°C, with full specifications guaranteed from −40°C to +85°C. Performance beyond +85°C follows typical characteristics shown in the datasheet's Figure 12 and Figure 19 - including functional operation up to +125°C with predictable drift behavior.
Does AD8221BRZ-R7 require external components to function at G = 1?
No - AD8221BRZ-R7 defaults to G = 1 when no resistor is connected between pins 2 and 3 (RG terminals). External components are only needed for gain >1; for G = 1, the device operates with just power supplies, input signals, and reference voltage if level-shifting is required.
Can AD8221BRZ-R7 drive a 10 kΩ load at full output swing?
Yes - AD8221BRZ-R7 delivers full output swing (e.g., ±13.5 V with ±15 V supplies) into 10 kΩ loads. At G = 1 and VS = ±15 V, output swing is specified as −VS + 1.2 V to +VS − 1.4 V, and settling time remains ≤13 µs (0.001%) for 10 V steps.
How does the REF pin affect AD8221BRZ-R7 output voltage?
The AD8221BRZ-R7 output is referenced to the voltage applied to the REF pin. For example, tying REF to +2.5 V shifts the entire output range by +2.5 V - enabling direct interfacing with single-supply ADCs. REF must be driven by a low-impedance source (<10 Ω) to avoid gain and CMRR degradation.
Is AD8221BRZ-R7 pin-compatible with other AD8221 variants like AD8221ARZ?
Yes - AD8221BRZ-R7 and AD8221ARZ share identical 8-lead SOIC packaging, pinout, and electrical specifications. The 'B' grade offers tighter dc performance (25 µV VOS vs. 60 µV for 'A' grade), but both are mechanically and electrically interchangeable in existing PCB layouts.
AD8221BRZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 825 kHz
- Current - Input Bias:
- 200 pA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 900µA
- Current - Output / Channel:
- 18 mA
- Voltage - Supply Span (Min):
- 4.6 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8221BRZ-R7 FAQ
1.How can I place an order for AD8221BRZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8221BRZ-R7 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 AD8221BRZ-R7 reliable?
The price and inventory of AD8221BRZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8221BRZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8221BRZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8221BRZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8221BRZ-R7?
AD8221BRZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8221BRZ-R7 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 AD8221BRZ-R7?
For technical support, including AD8221BRZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8221BRZ-R7 requirements.
6.How does Aetrix verify that AD8221BRZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8221BRZ-R7 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 AD8221BRZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8221BRZ-R7?
All AD8221BRZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8221BRZ-R7, 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 AD8221BRZ-R7 part is unused and in its original packaging.
Return procedure for AD8221BRZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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