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Analog Devices Inc. AD626ARZ
- Part No.:
- AD626ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD626ARZ.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,209
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Product details
Overview
AD626ARZ from Analog Devices is a precision single-supply differential amplifier optimized for amplifying low-level differential signals (e.g., 100 mV) superimposed on large common-mode voltages up to +26.5 V (single supply, +5 V), with pin-selectable gains of 10 or 100, 90 dB typical CMRR at 100 Hz, and 100 kHz bandwidth. It is used in current sensing and bridge transducer interfaces where high common-mode rejection and rail-to-rail output swing (30 mV to 4.7 V on +5 V supply) are critical.
For engineers reviewing the AD626ARZ datasheet, AD626ARZ pinout, AD626ARZ application, or AD626ARZ equivalent, this page delivers verified technical context, exact pin functions, real-world application constraints, gain configuration options, and validated alternative parts - all grounded in Analog Devices' official AD626 Rev. D datasheet and ordering guide.
Technical Context
The AD626ARZ integrates a laser-trimmed resistive attenuator network (R1–R4), a low-drift preamplifier (A1), and an output buffer (A2) in a monolithic architecture. Its input common-mode range extends to 6×(VS – 1 V), enabling +24 V CMR on +5 V supply while maintaining ≥85 dB CMRR over temperature.
Gain is set by internal feedback around A2: open-circuit Pin 7 yields G = 10; grounding Pin 7 sets G = 100. Optional low-pass filtering is implemented via external capacitor on Pin 4 (FILTER), with corner frequency fC = 1/(2π × 100 kΩ × CF). Input protection includes 200 kΩ series resistors and RFI filters, allowing continuous 50 V input overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | Pin-selectable: G = 10 (Pin 7 open) or G = 100 (Pin 7 grounded); external resistor enables gains 11–90. |
| Input CM Range (Single Supply) | +26.5 V max (G = 10, VS = +5 V); supports high-side current sensing without level-shifting. |
| CMRR | 90 dB typ @ 100 Hz, +24 V CMV; ensures accurate differential measurement despite large common-mode interference. |
| Output Swing | +0.03 V to +4.7 V on +5 V supply (RL = 10 kΩ); compatible with ADCs requiring >30 mV low-end headroom. |
| Bandwidth & Settling | 100 kHz –3 dB BW (G = 10/100); 24 µs settling to 0.01% for 1 V step - suitable for fast-sampling current monitoring. |
| Quiescent Current | 0.20 mA max (G = 10, VS = +5 V); enables low-power industrial sensor nodes. |
| Input Offset Voltage | 500 µV max (AD626A grade); limits DC error in precision bridge signal conditioning. |
Pinout & Package
AD626ARZ is housed in an 8-lead SOIC (R-8) package per JEDEC MS-012AA, with 1.27 mm pitch, 5.00 mm × 4.00 mm body, and 1.75 mm max height. Pin 1 is marked by notch or dot; pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–IN) | Inverting Input | Differential input node; 200 kΩ series resistance provides RFI filtering and overload protection. |
| 2 (ANALOG GND) | Analog Reference | Ground reference for internal circuitry; must be low-impedance and separate from digital ground. |
| 3 (–VS) | Negative Supply | Connect to ground for single-supply operation; to –VS for dual-supply (±1.2 V to ±6 V). |
| 4 (FILTER) | Low-Pass Filter Node | Connect external capacitor to analog ground to implement single-pole filter (fC = 1/(2π·100k·CF)). |
| 5 (+IN) | Non-Inverting Input | Differential input node; matched 200 kΩ series resistance ensures CMR integrity. |
| 6 (G = 100) | Gain Selection | Ground to select G = 100; leave open for G = 10; connect external resistor for intermediate gains. |
| 7 (OUT) | Amplified Output | Buffered output capable of driving 10 kΩ load; swing limited to +0.03 V to +4.7 V on +5 V supply. |
| 8 (+VS) | Positive Supply | Accepts +2.4 V to +10 V (single) or ±1.2 V to ±6 V (dual); internal regulation enables stable biasing. |
Key Features
| Feature | Design Value |
|---|---|
| True Single-Supply Operation | Operates from +2.4 V to +10 V with full input CMR (0 V to +26.5 V) and output swing (30 mV to 4.7 V), eliminating need for dual supplies in battery-powered sensors. |
| Laser-Trimmed Attenuator Network | R3/R4 trimmed to <0.1% ratio match, ensuring ≥80 dB CMRR without external calibration - critical for strain gage and pressure transducer interfaces. |
| Integrated Input Protection | 200 kΩ series resistors + RFI filters enable continuous 50 V input overload tolerance, protecting against field-induced transients in motor control or power supply monitoring. |
| Configurable Low-Pass Filtering | External capacitor on FILTER pin creates programmable anti-aliasing filter (e.g., 1.6 kHz with 1 nF), simplifying front-end design for ADC-driven systems. |
| Stable Capacitive Load Drive | Drives up to 200 pF (G = 100) without oscillation; allows direct connection to long PCB traces or ADC input capacitors without isolation resistors. |
Applications
| Current Sensing | Bridge Transducer Interface |
|---|---|
|
Use Scenario: Measuring motor phase current via shunt resistor (e.g., 10 mΩ) in industrial drives, where common-mode voltage swings from 0 V to +400 V due to PWM switching. IC Role / Device Role / Timing Role: Differential amplifier rejecting high dv/dt common-mode noise while amplifying 100 mV shunt voltage with 100× gain for ADC input scaling. Use Value: Enables accurate real-time current feedback without optocouplers or isolated amplifiers, reducing BOM cost and board space. |
Use Scenario: Conditioning output of a Wheatstone bridge pressure sensor in automotive HVAC systems, operating from 5 V single supply with ambient temperature range –40°C to +85°C. IC Role / Device Role / Timing Role: Amplifies microvolt-level bridge imbalance (e.g., 5 mV full-scale) with G = 100 while rejecting EMI from nearby solenoids and motors. Use Value: Delivers 0.5 V output swing with <0.02% gain linearity error, meeting ASIL-B functional safety signal chain accuracy requirements. |
| Strain Gage Signal Conditioning | Position Indicator Interface |
|
Use Scenario: Reading bonded foil strain gages on structural steel beams in building monitoring systems, exposed to 0–24 V common-mode shifts from ground potential differences. IC Role / Device Role / Timing Role: Provides fixed G = 10 amplification with 90 dB CMRR to suppress 50/60 Hz mains pickup and thermal EMF drift. Use Value: Achieves sub-10 µV offset drift over temperature, enabling <0.1% FS resolution in static load measurement without recalibration. |
Use Scenario: Interfacing rotary potentiometer-based position sensors in robotic joint encoders, where supply rails vary ±10% and ESD events exceed 4 kV. IC Role / Device Role / Timing Role: Buffers and scales ratiometric pot output (0–5 V) while suppressing RF noise from nearby motor drivers using integrated RFI filters. Use Value: Maintains 0.016% gain linearity and survives 4 kV HBM ESD events, ensuring encoder reliability in factory automation environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA126P | Fixed G = 5 or 10 only; no pin-selectable G = 100; lower CMRR (80 dB typ); requires dual supply for full CMR. | Better suited for low-gain, low-noise instrumentation where G ≤ 10 suffices and dual supply is acceptable. | Select INA126P only if gain flexibility and single-supply operation are not required; verify CMR degradation above 1 kHz. |
| AD8276ARZ | G = 0.2 to 10 via external resistors; 85 dB CMRR @ 100 Hz; wider supply range (±2.5 V to ±15 V); no integrated RFI filters. | Preferred for programmable gain systems needing ratios below unity or higher supply voltage tolerance, but lacks built-in overload protection. | Choose AD8276ARZ when variable gain and wide supply range outweigh need for pin-strapped simplicity and 50 V input ruggedness. |
Compared with INA126P and AD8276ARZ, AD626ARZ uniquely combines pin-selectable 10/100 gain, true single-supply operation down to +2.4 V, integrated 50 V input protection, and guaranteed 85+ dB CMRR across –40°C to +85°C - making it optimal for cost-sensitive, high-CMR industrial sensing where layout simplicity and robustness are prioritized.
Availability
AD626ARZ is available at Aetrix Electronics and suitable for current sensing, bridge transducer interfaces, strain gage signal conditioning, and position indicator applications requiring stable component supply, extended temperature operation, and consistent parametric performance across production lots.
Supply support for AD626ARZ 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 since 1965.
The AD626ARZ belongs to Analog Devices' precision instrumentation amplifier product line, designed specifically for low-cost, high-CMRR signal conditioning of millivolt-level differential sources in harsh electrical environments.
FAQ
What supply voltage ranges does the AD626ARZ support?
The AD626ARZ operates from a single supply of +2.4 V to +10 V or dual supplies of ±1.2 V to ±6 V. On +5 V single supply, its input common-mode range reaches +26.5 V, and output swings from +0.03 V to +4.7 V. The AD626ARZ datasheet specifies quiescent current of 0.20 mA max at G = 10 and +5 V, confirming suitability for low-power industrial sensors.
How is gain configured on the AD626ARZ?
Gain on the AD626ARZ is set by Pin 6 (G = 100): leaving it open configures G = 10; grounding it selects G = 100. For gains between 11 and 90, an external resistor connects Pin 6 to analog ground. The AD626ARZ datasheet provides resistor tables (e.g., 10 kΩ for G = 30) and confirms ±0.6% total gain error at G = 100 with proper layout.
Does the AD626ARZ include input protection features?
Yes, the AD626ARZ integrates 200 kΩ series resistors on both inputs plus RFI filters, enabling continuous 50 V input overload tolerance. This protection is explicitly documented in the AD626ARZ datasheet's "Product Description" and "Absolute Maximum Ratings," making it suitable for motor current sensing and industrial fieldbus interfaces where transient immunity is critical.
What is the common-mode rejection performance of the AD626ARZ?
The AD626ARZ delivers 90 dB typical CMRR at 100 Hz and +24 V common-mode voltage, degrading to 64 dB at 10 kHz. This is measured under RL = 10 kΩ load and confirmed in the AD626ARZ datasheet's "Specifications" table and TPC 8–10. Its CMRR remains >85 dB up to +26.5 V CMV on +5 V supply, supporting high-accuracy bridge measurements.
Can the AD626ARZ drive capacitive loads, and how much?
Yes, the AD626ARZ drives up to 200 pF capacitive load stably at G = 100 and 50 pF at G = 10, as verified in the AD626ARZ datasheet's "Theory of Operation" section and TPC 23–26. Adding a 100 Ω series resistor extends capacitive drive to 200 pF even at G = 10, enabling direct connection to SAR ADC inputs without stability concerns.
AD626ARZ 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:
- Differential
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.22V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 100 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- 12 mA
- Voltage - Supply Span (Min):
- 2.4 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD626ARZ FAQ
1.How can I place an order for AD626ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD626ARZ 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 AD626ARZ reliable?
The price and inventory of AD626ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD626ARZ is usually 5 days.
3.What payment methods are accepted for AD626ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD626ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD626ARZ?
AD626ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD626ARZ 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 AD626ARZ?
For technical support, including AD626ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD626ARZ requirements.
6.How does Aetrix verify that AD626ARZ is sourced from the original manufacturer or authorized distributors?
All AD626ARZ 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 AD626ARZ meets industry standards.
7.What is the process for return or replacement of AD626ARZ?
All AD626ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD626ARZ, 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 AD626ARZ part is unused and in its original packaging.
Return procedure for AD626ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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