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Analog Devices Inc. AD8421BRMZ-R7
- Part No.:
- AD8421BRMZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8421BRMZ-R7.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,332
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Product details
Overview
AD8421BRMZ-R7 from Analog Devices is a low-power, ultra-low-noise instrumentation amplifier with 3.2 nV/√Hz input voltage noise, 2.3 mA supply current, and 10 MHz bandwidth at G = 1. It serves as a precision front-end signal conditioner for high-impedance sensors in medical instrumentation and vibration analysis systems.
For engineers reviewing the AD8421BRMZ-R7 datasheet, AD8421BRMZ-R7 pinout, AD8421BRMZ-R7 application, or AD8421BRMZ-R7 equivalent, key selection criteria include input bias current (≤2 nA), CMRR (≥94 dB at DC, ≥80 dB at 20 kHz), gain flexibility (1–10,000 via single resistor), and robust ±40 V input protection relative to supplies.
Technical Context
The AD8421BRMZ-R7 employs a current-feedback architecture that maintains 2 MHz bandwidth and 0.8 µs settling time to 0.001% at G = 100-enabling high-channel-count multiplexed data acquisition. Its input stage uses proprietary protection circuitry to tolerate ±40 V overvoltage while preserving 30 GΩ||3 pF input impedance and sub-200 fA/√Hz current noise.
Gain is set by a single external resistor across RG pins (G = 1 + 9.9 kΩ/RG), and the REF pin allows precise output offset adjustment with 1 ppm/V reference gain accuracy. The device operates from ±2.5 V to ±18 V dual supply or 5 V to 36 V single supply, with specified performance from −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 3.2 nV/√Hz at 1 kHz - enables resolution of microvolt-level sensor signals without amplifying thermal noise. |
| Supply Current | 2.3 mA max - supports battery-powered portable instrumentation with minimal power budget impact. |
| CMRR (DC, G=1) | 94 dB min - rejects common-mode interference from ECG electrodes or industrial transducers. |
| Bandwidth (G=1) | 10 MHz - accommodates fast transient capture in vibration analysis up to ~1.6 MHz Nyquist frequency. |
| Input Protection | ±40 V beyond opposite rail - eliminates need for external clamping diodes in harsh industrial sensor interfaces. |
| Gain Range | 1 to 10,000 - configured with one precision resistor, simplifying calibration and reducing BOM count. |
| Input Bias Current | 2 nA max - preserves signal integrity with high-impedance pH or piezoelectric sensors. |
Pinout & Package
AD8421BRMZ-R7 is housed in an 8-lead MSOP package (3 mm × 3 mm, 0.65 mm pitch) with exposed pad thermally connected to −VS or left floating per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative differential input | High-impedance node for inverted sensor signal; protected to −VS + 40 V. |
| 2,3 (RG) | Gain-setting terminals | Resistor connection point defining gain G = 1 + 9.9 kΩ/RG; no internal biasing required. |
| 4 (+IN) | Positive differential input | High-impedance node for non-inverted sensor signal; protected to +VS − 40 V. |
| 5 (−VS) | Negative supply rail | Power return path; exposed pad must be tied to this pin or left unconnected. |
| 6 (REF) | Reference voltage input | Low-impedance level-shift node; drives output offset with 1 ppm/V gain accuracy. |
| 7 (VOUT) | Differential output | Single-ended output capable of ±(VS − 1.6 V) swing into 2 kΩ load. |
| 8 (+VS) | Positive supply rail | Primary power input; supports dual (±2.5 V to ±18 V) or single (5 V to 36 V) operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage noise | 3.2 nV/√Hz at 1 kHz - critical for extracting weak bio-signals from high-source-impedance electrodes. |
| Input overvoltage protection | ±40 V beyond opposite supply rail - removes need for external protection components in field-deployed equipment. |
| Current-feedback architecture | Maintains 2 MHz bandwidth at G = 100 - enables accurate amplification of fast-rising mechanical shock pulses. |
| Single-resistor gain setting | G = 1 + 9.9 kΩ/RG - reduces calibration complexity and improves long-term gain stability vs. multi-resistor networks. |
| Wide supply range | ±2.5 V to ±18 V dual / 5 V to 36 V single - interoperable with legacy industrial rails and modern low-voltage microcontrollers. |
Applications
| Medical Instrumentation | Precision Data Acquisition |
|---|---|
Use Scenario: Amplifying low-amplitude ECG signals from dry-electrode wearable patches with high common-mode noise. IC Role / Device Role / Timing Role: Front-end instrumentation amplifier providing differential gain, CMRR >94 dB, and 3.2 nV/√Hz noise floor. Use Value: Enables detection of 10 µV cardiac features without external filtering, reducing system latency and component count. | Use Scenario: Conditioning outputs from strain-gauge bridges in structural health monitoring nodes. IC Role / Device Role / Timing Role: Precision signal conditioner with 2 nA input bias current and 0.2 µV/°C offset drift. Use Value: Maintains <0.01% measurement accuracy across −40°C to +85°C ambient without active temperature compensation. |
| Vibration Analysis | ADC Driver |
Use Scenario: Amplifying piezoelectric accelerometer outputs in predictive maintenance edge sensors. IC Role / Device Role / Timing Role: High-bandwidth (10 MHz at G = 1) in-amp driving anti-aliasing filter before 16-bit SAR ADC. Use Value: Preserves 0.6 µs settling to 0.001%, ensuring full-scale step fidelity for FFT-based spectral analysis. | Use Scenario: Driving AD7685 16-bit ADC inputs in isolated analog front-ends. IC Role / Device Role / Timing Role: Low-output-impedance driver with 35 V/µs slew rate and rail-to-rail compatible output swing. Use Value: Eliminates external buffer stage, reducing THD+N to <−100 dB and enabling direct interface to 1 MSPS ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8420ARMZ-R7 | Higher input bias current (5 nA max), lower CMRR (86 dB min at DC), same 3.2 nV/√Hz noise. | Better suited for cost-sensitive industrial sensors where offset drift tolerance is relaxed. | Select when budget constraints outweigh need for ultra-low bias current in high-Z source applications. |
| LTC6915IMS8#PBF | Lower bandwidth (2.5 MHz at G = 1), higher supply current (3.5 mA), programmable gain via SPI. | Preferred for digitally reconfigurable systems requiring on-the-fly gain changes without hardware modification. | Choose when system-level flexibility justifies trade-offs in speed and power efficiency. |
Compared with AD8421BRMZ-R7, AD8420ARMZ-R7 offers lower cost but sacrifices input bias current and CMRR for high-impedance sensor interfaces, while LTC6915IMS8#PBF adds digital control at the expense of bandwidth and quiescent power-making AD8421BRMZ-R7 optimal for fixed-gain, low-noise, high-precision analog signal chains.
Availability
AD8421BRMZ-R7 is available at Aetrix Electronics and suitable for medical instrumentation, precision data acquisition, and vibration analysis requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8421BRMZ-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, serving industrial, automotive, communications, and healthcare markets.
The AD8421 product line delivers ultra-low-noise, low-power instrumentation amplifiers optimized for precision sensor signal conditioning in demanding environments where accuracy, reliability, and input protection are critical.
FAQ
What is the maximum gain achievable with AD8421BRMZ-R7?
The AD8421BRMZ-R7 supports gains from 1 to 10,000 using a single external resistor connected between its RG pins, calculated as G = 1 + (9.9 kΩ / RG). At G = 10,000, the required RG is 0.99 Ω, and bandwidth reduces to 0.2 MHz. The AD8421BRMZ-R7 maintains specified performance across this full range when used with appropriate layout and decoupling.
Does AD8421BRMZ-R7 require external protection diodes on its inputs?
No, AD8421BRMZ-R7 incorporates integrated input protection that withstands voltages up to ±40 V beyond the opposite supply rail without damage. This eliminates the need for external clamping diodes in most industrial and medical sensor interfaces, provided supply rails remain within absolute maximum ratings (±18 V).
What is the operating temperature range for AD8421BRMZ-R7?
The AD8421BRMZ-R7 is specified for full performance from −40°C to +85°C and operates reliably from −40°C to +125°C. Its BR grade guarantees 94 dB minimum CMRR and 0.2 µV/°C max input offset voltage drift within the −40°C to +85°C range, making it suitable for industrial and automotive under-hood applications.
Can AD8421BRMZ-R7 be used with single-supply operation?
Yes, AD8421BRMZ-R7 supports single-supply operation from 5 V to 36 V. When operated from a single rail, the input common-mode range extends from (V− + 2.3 V) to (V+ − 1.8 V), and output swing reaches within 1.6 V of the positive rail and 1.2 V of ground. Proper REF pin biasing is required to center the output within the valid range.
How does the REF pin function in AD8421BRMZ-R7?
AD8421BRMZ-R7's REF pin accepts a low-impedance voltage source to add a precise offset to the output: VOUT = G × (V+IN − V−IN) + VREF. The reference gain is 1 ± 0.0001 V/V, enabling accurate level-shifting for ADC interfacing or bipolar signal translation without additional op-amps.
AD8421BRMZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 35V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 10 MHz
- Current - Input Bias:
- 100 pA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 2mA
- Current - Output / Channel:
- 65 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8421BRMZ-R7 FAQ
1.How can I place an order for AD8421BRMZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8421BRMZ-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 AD8421BRMZ-R7 reliable?
The price and inventory of AD8421BRMZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8421BRMZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8421BRMZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8421BRMZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8421BRMZ-R7?
AD8421BRMZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8421BRMZ-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 AD8421BRMZ-R7?
For technical support, including AD8421BRMZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8421BRMZ-R7 requirements.
6.How does Aetrix verify that AD8421BRMZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8421BRMZ-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 AD8421BRMZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8421BRMZ-R7?
All AD8421BRMZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8421BRMZ-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 AD8421BRMZ-R7 part is unused and in its original packaging.
Return procedure for AD8421BRMZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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