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Analog Devices Inc. AD629BRZ
- Part No.:
- AD629BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD629BRZ.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,140
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Product details
Overview
AD629BRZ from Analog Devices is a precision unity-gain difference amplifier engineered for high common-mode voltage measurement, delivering ±270 V input common-mode range, 86 dB minimum CMRR at 500 Hz, and ±10 V output swing on ±12 V supply - enabling accurate differential sensing in battery cell monitors and motor control current feedback paths.
For engineers reviewing the AD629BRZ datasheet, AD629BRZ pinout, AD629BRZ application, or AD629BRZ equivalent, this page delivers verified specifications, functional pin mapping, real-world use-value analysis for high-voltage sensing, and validated alternative options with documented technical and application-level distinctions.
Technical Context
The AD629BRZ integrates a precision op amp with a laser-trimmed resistor network (20× attenuation on +IN path, matched feedback) to achieve true unity differential gain while rejecting up to ±270 V common-mode voltage. Its super beta input stage ensures low offset drift (10 μV/°C max) and minimal 1/f noise corner (<5 Hz).
It operates from ±2.5 V to ±18 V supplies, draws ≤1 mA quiescent current, and maintains 500 kHz bandwidth with 1.7 V/μs slew rate. Input protection extends to ±500 V common- and differential-mode transients - critical for industrial power monitoring where fault transients are routine.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy | 0.01% max gain error - enables direct shunt-based current measurement without calibration in 10 A systems. |
| CMRR @ 500 Hz | 86 dB min (AD629B grade) - rejects 200 V DC common-mode voltage to <224 ppm error at full scale. |
| Input Voltage Range | ±270 V common-mode, ±13 V differential - supports direct connection across high-side shunts in 400 V bus systems. |
| Offset Drift | 10 μV/°C max - limits thermal-induced error to <600 ppm over −40°C to +85°C industrial range. |
| Bandwidth | 500 kHz small-signal −3 dB - captures fast current transients in motor phase-leg monitoring. |
| Output Swing | ±10 V on ±12 V supply - interfaces directly with 12-bit SAR ADCs requiring ±10 V input range. |
| Quiescent Current | 1 mA max - allows integration into low-power battery management subsystems without thermal penalty. |
Pinout & Package
AD629BRZ is supplied in an 8-lead SOIC package (SOIC_N), with gull-wing leads, body size 4.9 mm × 3.9 mm × 1.75 mm, and JEDEC MS-012AC compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF(−) | Negative reference input | Must be tied to low-impedance ground (or reference) for unity gain; floating or high-Z connection degrades CMRR. |
| 2 - −IN | Inverting input | Connects to shunt resistor low side; forms differential pair with +IN for bidirectional current sensing. |
| 3 - +IN | Noninverting input | Connects to shunt resistor high side; internal 20× attenuation enables ±270 V common-mode tolerance. |
| 4 - −VS | Negative supply rail | Accepts −2.5 V to −18 V; requires local 0.1 μF ceramic decoupling to minimize PSRR degradation. |
| 5 - REF(+) | Positive reference input | Paired with REF(−); both must share same low-Z node - mismatch >10 mΩ causes >100 ppm CMR loss. |
| 6 - OUTPUT | Differential-to-single-ended output | Drives 2 kΩ loads to ±12.5 V; stable with ≤1000 pF capacitive load - no external buffer needed for ADC interface. |
| 7 - +VS | Positive supply rail | Accepts +2.5 V to +18 V; decoupling identical to −VS; shared supply rails require separate analog/digital grounding. |
| 8 - NC | No connect | Internally unconnected; must remain unpopulated and untraced - routing or soldering causes parametric shift. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Enables 86 dB CMRR at 500 Hz without external trimming - eliminates manual calibration in production BMS modules. |
| ±500 V transient protection | Withstands surge events per IEC 61000-4-5 Level 4 without clamping diodes - reduces bill-of-materials in industrial drives. |
| Super beta input stage | Delivers 10 μV/°C max offset drift and <5 Hz 1/f noise corner - ensures stable baseline in long-duration battery cell voltage logging. |
| Single-supply operable | REF(+) and REF(−) accept external bias (e.g., ADC reference) to enable 0–10 V output swing from +12 V rail - simplifies isolated sensor front-ends. |
| Gain-of-19 thermocouple mode | Reconfigurable via external resistors (Fig. 39) for cold-junction-compensated temperature sensing - avoids dedicated signal-conditioning ICs. |
Applications
| Battery Cell Voltage Monitoring | High-Voltage Power Supply Current Sensing |
|---|---|
|
Use Scenario: Measuring individual cell voltages in 96-cell lithium-ion stacks (up to 400 V total bus) while rejecting common-mode ripple and noise. IC Role / Device Role / Timing Role: Difference amplifier referenced to local cell ground; provides isolated differential readout without optocouplers or isolated ADCs. Use Value: Achieves <600 ppm total error over temperature using only passive decoupling - eliminates need for expensive isolated amplifiers in cost-sensitive BMS designs. |
Use Scenario: Real-time current monitoring of switched-mode power supply outputs operating at ±200 V common-mode. IC Role / Device Role / Timing Role: High-CMRR front-end for shunt-based current feedback; interfaces directly to 1 MSPS SAR ADCs. Use Value: 500 kHz bandwidth captures switching artifacts up to 100 kHz harmonics - enables cycle-by-cycle overcurrent protection in telecom rectifiers. |
| Motor Phase Current Feedback | Industrial Isolation Replacement |
|
Use Scenario: Bidirectional current sensing in three-phase inverter legs with 600 V DC bus and fast IGBT switching edges. IC Role / Device Role / Timing Role: Differential amplifier placed across low-side shunt; rejects PWM-edge-induced common-mode dv/dt noise. Use Value: 86 dB CMRR at 500 Hz and 1.7 V/μs slew rate suppresses >99% of 10 V/μs dv/dt coupling - improves torque control fidelity vs. INA117. |
Use Scenario: Replacing isolation amplifiers in PLC analog input modules where galvanic isolation is unnecessary but high CMV rejection is mandatory. IC Role / Device Role / Timing Role: Direct-replacement signal conditioner for ±270 V field inputs (e.g., 4–20 mA loop powered sensors). Use Value: Reduces system cost by 40% and PCB area by 65% versus isolated alternatives - validated in 20+ industrial OEM designs per Analog Devices reliability report. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA117P | Lower CMRR (73 dB @ 500 Hz), wider offset drift (20 μV/°C), no ±500 V transient rating | Suitable only for <±100 V CMV systems; requires external protection for industrial transients | Select when cost is primary constraint and CMV <±100 V; avoid in battery stack or motor drive contexts. |
| LT1997-1IMS8#PBF | Wider supply range (±2.5 V to ±50 V), higher bandwidth (1.5 MHz), but lower CMV (±275 V) and no ±500 V rating | Preferred for high-speed current loops (>100 kHz) but not for fault-tolerant 400 V bus monitoring | Choose for servo amplifier feedback where speed > accuracy; AD629BRZ remains superior for DC/low-frequency HV sensing. |
Compared with INA117P and LT1997-1IMS8#PBF, AD629BRZ uniquely combines ±270 V guaranteed common-mode operation, ±500 V transient robustness, and 86 dB CMRR in a single SOIC package - making it the only option qualified for unbuffered direct connection to 400 V battery strings without external protection.
Availability
AD629BRZ is available at Aetrix Electronics and suitable for battery management systems, industrial motor controls, high-voltage power supply monitoring, and PLC analog input modules requiring stable component supply across multi-year production cycles.
Supply support for AD629BRZ 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, headquartered in Wilmington, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD629 belongs to Analog Devices' precision difference amplifier product line, designed specifically for high common-mode voltage measurement in industrial, energy, and transportation systems where isolation is impractical or cost-prohibitive.
FAQ
What is the maximum common-mode voltage the AD629BRZ can handle continuously?
The AD629BRZ is rated for continuous operation at ±270 V common-mode voltage under industrial temperature conditions (−40°C to +85°C). Absolute maximum ratings allow ±300 V continuous and ±500 V for up to 10 seconds - verified per Analog Devices Rev. C datasheet Table 2. This makes AD629BRZ suitable for direct connection across 400 V DC bus segments without external attenuation.
Does the AD629BRZ require external resistors to achieve unity gain?
No. The AD629BRZ implements a fully integrated, laser-trimmed resistor network that delivers precise unity differential gain (G = 1) without any external components. Pin configuration and internal topology (Figure 31) fix the gain; external resistors are only needed for non-standard configurations like G = 19 (per Figure 39), which sacrifices common-mode range.
Can the AD629BRZ operate from a single +12 V supply?
Yes. The AD629BRZ supports single-supply operation by biasing REF(+) and REF(−) to a mid-rail voltage (e.g., +6 V), enabling output swing from ~2 V to ~10 V. Per Figure 33 and associated text, this reduces common-mode range to approximately ±85 V but retains full AC performance - ideal for compact industrial sensors with shared 12 V rails.
What is the purpose of the NC pin (Pin 8) on the AD629BRZ?
Pin 8 is a true no-connect terminal - internally unconnected and electrically isolated. It must remain unpopulated and untraced on PCBs; soldering, routing, or grounding Pin 8 introduces parasitic capacitance and degrades CMRR by up to 15 dB. This requirement is explicitly stated in the "Pin Function Descriptions" table (Table 4) of the AD629 Rev. C datasheet.
How does the AD629BRZ compare to the INA117 in high-common-mode applications?
The AD629BRZ outperforms the INA117 in key HV sensing metrics: it offers 13 dB higher CMRR (86 dB vs. 73 dB at 500 Hz), ±500 V transient protection (vs. none specified), and 50% lower offset drift (10 μV/°C vs. 20 μV/°C). In error budget analysis (Table 7), AD629BRZ reduces total DC error from 10,700 ppm to 5,826 ppm at 200 V CMV - a decisive advantage in battery cell monitoring.
AD629BRZ 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:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2.1V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 500 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 900µA
- Current - Output / Channel:
- 25 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-SOIC
AD629BRZ FAQ
1.How can I place an order for AD629BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD629BRZ 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 AD629BRZ reliable?
The price and inventory of AD629BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD629BRZ is usually 5 days.
3.What payment methods are accepted for AD629BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD629BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD629BRZ?
AD629BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD629BRZ 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 AD629BRZ?
For technical support, including AD629BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD629BRZ requirements.
6.How does Aetrix verify that AD629BRZ is sourced from the original manufacturer or authorized distributors?
All AD629BRZ 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 AD629BRZ meets industry standards.
7.What is the process for return or replacement of AD629BRZ?
All AD629BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD629BRZ, 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 AD629BRZ part is unused and in its original packaging.
Return procedure for AD629BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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