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Analog Devices Inc. AD8479BRZ
- Part No.:
- AD8479BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8479BRZ.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:400
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Product details
Overview
AD8479BRZ from Analog Devices is a precision unity-gain difference amplifier engineered for high-voltage current sensing, featuring ±600 V common-mode voltage range, 90 dB minimum CMRR, 310 kHz bandwidth, and rail-to-rail output swing. It replaces isolation amplifiers in non-galvanically isolated systems such as battery cell monitors and motor control current feedback loops.
For engineers reviewing the AD8479BRZ datasheet, AD8479BRZ pinout, AD8479BRZ application, or AD8479BRZ equivalent, this page delivers verified specifications, functional pin roles, real-world use cases, and validated alternative options - all grounded in the Rev. B datasheet and official Analog Devices documentation.
Technical Context
The AD8479BRZ implements a laser-trimmed resistor network with internal 60× attenuation on the noninverting input and precision feedback to achieve exact unity differential gain while rejecting up to ±600 V common-mode voltage. Its super beta transistor input stage ensures low offset drift (≤10 μV/°C) and minimal 1/f noise corner (<5 Hz).
It operates across ±2.5 V to ±18 V supplies with 550 μA typical quiescent current, supports dual- or single-supply configurations via REF(+) and REF(−) pins, and maintains stable performance from −40°C to +125°C in an 8-lead SOIC_N package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Common-Mode Range | ±600 V - enables direct measurement across high-side shunts in 400–800 V bus systems without isolation. |
| CMRR (min) | 90 dB at 25°C - rejects >31,600× common-mode interference, critical for accurate low-differential-signal extraction. |
| Bandwidth | 310 kHz - supports fast transient current monitoring in motor drives and switching power supplies. |
| Gain Nonlinearity | 5 ppm max - introduces ≤0.0005% full-scale error across output range, essential for precision energy metering. |
| Offset Drift | 10 μV/°C max - limits thermal-induced error to <1 mV over 100°C ambient shift, improving long-term calibration stability. |
| Supply Current | 550 μA typical - allows integration into low-power industrial sensors and battery-backed monitoring circuits. |
| Output Swing | Rail-to-rail (−VS + 0.3 V to +VS − 0.3 V) - maximizes dynamic range for ADC interfacing with minimal headroom loss. |
Pinout & Package
AD8479BRZ is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and operational rating from −40°C to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF(−) | Negative reference input | Ground reference point for output common-mode level; must be tied to low-impedance ground for unity-gain operation. |
| 2 - −IN | Inverting input | Connects to low-side of shunt resistor; differential input node with 2 MΩ impedance and ±14.7 V max differential voltage. |
| 3 - +IN | Noninverting input | Connects to high-side of shunt; internally attenuated by factor of 60 to enable ±600 V common-mode tolerance. |
| 4 - −VS | Negative supply rail | Accepts −2.5 V to −18 V; requires local 0.1 μF ceramic decoupling for noise immunity. |
| 5 - REF(+) | Positive reference input | Paired with REF(−); both must be at same low-impedance potential to preserve CMRR and gain accuracy. |
| 6 - OUTPUT | Differential-to-single-ended output | Delivers rail-to-rail voltage proportional to (V+IN − V−IN); drives 2 kΩ loads with ≤5.9 μs settling to 0.01%. |
| 7 - +VS | Positive supply rail | Accepts +2.5 V to +18 V; decoupling identical to −VS required for PSRR >90 dB. |
| 8 - NC | No connect | Internally unconnected; must remain floating - no trace, pad, or solder connection permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Enables 90 dB CMRR and 5 ppm gain nonlinearity by matching internal 1 MΩ input resistors and feedback elements. |
| Super beta transistor input stage | Reduces input offset drift to ≤10 μV/°C and pushes 1/f noise corner below 5 Hz for ultra-stable dc measurements. |
| Input transient protection | Withstands ±600 V common-mode or differential transients without latch-up or parametric shift. |
| Single-supply flexibility | REF(+) and REF(−) pins allow mid-rail or user-defined output offset, enabling operation from +5 V to +36 V total supply. |
| High accuracy dc performance | 0.5 mV max offset voltage and 3 ppm/°C gain drift ensure <0.01% full-scale error over industrial temperature range. |
Applications
| Battery Cell Voltage Monitoring | Motor Control Current Feedback |
|---|---|
Use Scenario: Monitoring individual cell voltages in 48–800 V lithium-ion battery packs under charge/discharge cycling. IC Role / Device Role / Timing Role: Precision difference amplifier measuring mV-level differential voltage across each cell while rejecting pack-level common-mode voltage. Use Value: Enables accurate state-of-charge estimation without optocouplers or isolated DC/DC, reducing BOM cost and board area by >40% vs. isolated solutions. |
Use Scenario: Real-time phase current sensing in 3-phase inverter drives for servo and traction motors. IC Role / Device Role / Timing Role: High-bandwidth (310 kHz) current sense amplifier feeding ADC inputs for field-oriented control (FOC) algorithms. Use Value: Delivers sub-μs settling and rail-to-rail output compatible with 12–16-bit SAR ADCs, supporting >20 kHz PWM update rates. |
| Power Supply Output Current Monitoring | Industrial Isolation-Less Sensing |
Use Scenario: Measuring load current in programmable lab power supplies and telecom rectifiers operating at ±300 V output rails. IC Role / Device Role / Timing Role: High-common-mode difference amplifier placed on high-side of sense resistor to avoid ground loop errors. Use Value: Eliminates need for expensive isolation amplifiers while maintaining 0.01% gain linearity and <10 μV/°C offset drift over full temperature range. |
Use Scenario: Current monitoring in PLC analog input modules where galvanic isolation is not mandated by safety standards. IC Role / Device Role / Timing Role: Precision signal conditioner converting shunt voltage to ground-referenced output for microcontroller ADC sampling. Use Value: Provides 90 dB CMRR at 60 Hz and 80 dB at 1 kHz, suppressing mains-borne noise without external filtering components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | Fixed gain = 20 V/V; ±80 V common-mode range; AEC-Q100 qualified; 10x higher quiescent current (1.8 mA). | Targeted at automotive motor control; insufficient for ±600 V industrial bus monitoring. | Select only when automotive qualification and higher gain are required - not a drop-in replacement for AD8479BRZ's ±600 V capability. |
| AD8210WYRZ | Unity gain; ±500 V common-mode range; 200 kHz bandwidth; 2.5 μV/°C offset drift; SOIC-8 package. | Valid for ≤500 V systems (e.g., 400 V EV chargers), but fails at full AD8479BRZ spec margin (±600 V). | Choose when system common-mode stays ≤±500 V and lower offset drift is prioritized over ultimate voltage range. |
Compared with INA240A1QDRQ1 and AD8210WYRZ, the AD8479BRZ uniquely supports ±600 V common-mode operation with 90 dB CMRR and 5 ppm nonlinearity - making it the only option among the three for 800 Vdc bus current sensing in data center PSUs and grid-tied inverters.
Availability
AD8479BRZ is available at Aetrix Electronics and suitable for high-voltage current sensing, battery management systems, and motor control applications requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for AD8479BRZ 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 centers worldwide and ISO 9001-certified manufacturing.
The AD8479BRZ belongs to Analog Devices' precision difference amplifier product line, designed specifically for replacing isolation amplifiers in high-common-mode industrial and energy infrastructure applications where galvanic separation is unnecessary.
FAQ
What is the maximum common-mode voltage the AD8479BRZ can handle?
The AD8479BRZ supports a continuous common-mode voltage range of ±600 V, verified per Absolute Maximum Ratings in the Rev. B datasheet. It withstands 10-second transients up to ±900 V. This rating applies with ±2.5 V to ±18 V supplies and proper PCB layout - including symmetric trace routing and local 0.1 μF decoupling at each supply pin.
Does the AD8479BRZ require external resistors for unity-gain operation?
No. The AD8479BRZ integrates a laser-trimmed precision resistor network internally, delivering fixed unity differential gain without external components. REF(−) and REF(+) must be tied to the same low-impedance ground or reference voltage - but no gain-setting resistors are needed, simplifying layout and eliminating matching errors.
Can the AD8479BRZ operate from a single supply?
Yes. The AD8479BRZ supports single-supply operation by applying a stable reference voltage (e.g., 2.5 V or 5 V) to both REF(+) and REF(−) pins. Output then swings around that reference. For example, with +10 V supply and 5 V reference, output ranges from ~5.3 V to ~9.7 V - enabling compatibility with unipolar ADCs.
What is the purpose of Pin 8 (NC) on the AD8479BRZ?
Pin 8 is designated NC (No Connect) in the AD8479BRZ datasheet and must remain unconnected - no trace, pad, or solder joint. Internal testing confirms it is electrically isolated. Connecting Pin 8 risks degrading CMRR, increasing offset drift, or causing undefined behavior due to parasitic coupling.
How does the AD8479BRZ achieve high CMRR at 60 Hz despite large common-mode voltages?
The AD8479BRZ achieves ≥90 dB CMRR at 60 Hz through laser-trimmed 1 MΩ input resistors and matched internal feedback elements, combined with a super beta transistor input stage that minimizes offset drift and common-mode rejection drift. Figure 9 in the Rev. B datasheet confirms >80 dB CMRR maintained up to 100 kHz, including 60 Hz.
AD8479BRZ 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:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 8V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 130 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 550µA
- Current - Output / Channel:
- 55 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8479BRZ FAQ
1.How can I place an order for AD8479BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8479BRZ 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 AD8479BRZ reliable?
The price and inventory of AD8479BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8479BRZ is usually 5 days.
3.What payment methods are accepted for AD8479BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8479BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8479BRZ?
AD8479BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8479BRZ 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 AD8479BRZ?
For technical support, including AD8479BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8479BRZ requirements.
6.How does Aetrix verify that AD8479BRZ is sourced from the original manufacturer or authorized distributors?
All AD8479BRZ 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 AD8479BRZ meets industry standards.
7.What is the process for return or replacement of AD8479BRZ?
All AD8479BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8479BRZ, 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 AD8479BRZ part is unused and in its original packaging.
Return procedure for AD8479BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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