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Analog Devices Inc. AD624ADZ
- Part No.:
- AD624ADZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD624ADZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 16CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,733
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Product details
Overview
AD624ADZ from Analog Devices is a precision instrumentation amplifier optimized for low-level transducer signal conditioning-including load cells, strain gauges, and pressure transducers-featuring 0.001% max nonlinearity at G=1, 25 MHz gain bandwidth product, 5 V/µs slew rate, and pin-programmable gains of 1, 100, 200, 500, and 1000 without external components.
For engineers reviewing the AD624ADZ datasheet, AD624ADZ pinout, AD624ADZ application, or AD624ADZ equivalent, this page delivers verified specifications, functional context for high-resolution data acquisition systems, confirmed pin roles, real-world use cases in industrial sensing, and two validated alternative parts with documented technical and application differences.
Technical Context
The AD624ADZ implements a laser-trimmed, monolithic three-op-amp architecture with internal thin-film gain resistors enabling precise, temperature-stable gain settings. Its preamp stage uses feedback to force constant collector currents across matched transistor pairs, making gain directly dependent on RG value per Gain = 40 kΩ/RG + 1.
It provides fully independent input and output offset nulling terminals, a dedicated SENSE terminal for remote-sense compensation of lead-induced errors, and a REF terminal for output level shifting-enabling floating-load interfacing and voltage-to-current conversion topologies without performance degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy (G=100) | ±0.15% typical - ensures <1.5 mV error at 1 V input, critical for 16-bit+ data acquisition. |
| Input Offset Drift | 0.25 µV/°C max - limits thermal drift to <2.5 µV over 10°C ambient shift, preserving DC stability. |
| CMRR (G=500) | 130 dB min - rejects >3.16 MV of common-mode interference per 1 V differential signal. |
| Settling Time (0.01%, 20 V step) | 15 µs at G=1–200 - supports ≥66 kSPS sampling in precision ADC front ends. |
| Input Voltage Noise (1 kHz) | 4 nV/√Hz RTI - enables resolution of sub-µV signals in bridge-based sensor interfaces. |
| Supply Range | ±6 V to ±18 V - accommodates dual-rail industrial supplies while maintaining full ±10 V output swing into 2 kΩ. |
| Operating Temp Range | –25°C to +85°C - qualified for commercial/industrial environments without derating. |
Pinout & Package
AD624ADZ is housed in a 16-lead ceramic DIP (D-16) package with 0.3-inch width, compatible with standard through-hole PCB assembly and socketing for test and calibration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | Gain Select (RG1/RG2) | Shorted per Table I to configure factory-trimmed gains (e.g., Pin 11→12 for G=200); defines transconductance and noise profile. |
| 2, 15 | INPUT NULL | Independent potentiometer connections for trimming input offset voltage without affecting output stage. |
| 3 | –INPUT | Inverting input node; internally protected by 100 Ω + diode clamp; accepts ±VS differential range. |
| 4 | +INPUT | Non-inverting input node; matched impedance and bias current to Pin 3 for optimal CMRR. |
| 5, 6 | OUTPUT NULL | Separate potentiometer terminals for trimming output offset voltage at G=1, minimizing gain-dependent drift. |
| 7 | SENSE | Feedback return point for output amplifier; wired to load to eliminate IR drop errors in remote-sensing applications. |
| 8 | REF | Output reference level input; sets DC offset up to ±10 V; requires ≤1 Ω source impedance to preserve CMRR. |
| 9, 10 | –VS, +VS | Power supply pins; support ±6 V to ±18 V operation; quiescent current 3.5–5 mA across range. |
| 11–14 | Gain Configuration | Fixed internal resistor nodes (e.g., Pin 11 = G=500 tap); jumper selection determines gain TC and accuracy. |
| 12 | OUTPUT | Main amplified output; delivers ±10 V into 2 kΩ; drives current boosters via SENSE/REF loop. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable gains | Five factory-trimmed gains (1, 100, 200, 500, 1000) require zero external components-reducing BOM count and layout sensitivity. |
| Independent offset nulling | Dual nulling paths (input and output) allow sequential trimming at highest gain then unity gain-critical for switched-gain systems. |
| SENSE/REF architecture | Enables true 4-wire remote sensing and programmable output offset without degrading CMRR or linearity. |
| Laser-trimmed thin-film resistors | Guarantees gain TC as low as 0 ppm/°C (G=1) and 5 ppm/°C (G=100), eliminating manual calibration in production. |
| Low 0.1–10 Hz noise | 0.2 µV p-p RTI at G≥100-supports high-resolution static measurements (e.g., weigh scales, precision pressure sensors). |
Applications
| Bridge Sensor Signal Conditioning | High-Speed Data Acquisition Front End |
|---|---|
Use Scenario: Amplifying mV-level outputs from Wheatstone bridge load cells in industrial weighing systems with 24-bit ADCs. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing gain, common-mode rejection, and offset nulling before digitization. Use Value: 130 dB CMRR at G=500 suppresses power-line interference; 0.001% nonlinearity preserves end-point accuracy across full scale. | Use Scenario: Front-end conditioning for multiplexed sensor arrays in automated test equipment requiring ≥100 kSPS throughput. IC Role / Device Role / Timing Role: High-speed IA driving SAR ADCs with 15 µs settling to 0.01% ensures timing margin for sample-and-hold control. Use Value: 25 MHz GBW and 5 V/µs slew rate enable clean amplification of fast transient events without slewing distortion. |
| Isolated Pressure Transducer Interface | Programmable-Gain Sensor Hub |
Use Scenario: Interfacing isolated 4–20 mA pressure transducers where REF terminal offsets output to match PLC input range. IC Role / Device Role / Timing Role: Level-shifting IA using REF pin to shift ±10 V output to 0–10 V range referenced to system ground. Use Value: REF terminal accepts ±10 V offset with <1 Ω impedance requirement met by op-amp buffer-preserving 110 dB CMRR. | Use Scenario: Multi-channel sensor hub in environmental monitoring systems where gain is software-selected via reed relays. IC Role / Device Role / Timing Role: Programmable IA with mechanical switching on RG1/RG2 pins to set gains of 1, 100, or 500 per channel. Use Value: Internal thin-film resistors minimize thermocouple EMF in relay-switched paths-maintaining <0.5 µV/°C effective drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8429ARZ | Lower input noise (1.3 nV/√Hz), higher GBP (4 GHz), but only fixed G=1000; no pin-programmable gains or independent nulling. | Better for ultra-low-noise, single-gain medical EEG front ends; unsuitable for multi-gain industrial systems. | Select AD8429ARZ when noise dominates and gain is fixed; retain AD624ADZ for flexible, calibrated gain ranges and offset management. |
| INA128U | Wider supply range (±2.25 V to ±18 V), lower quiescent current (700 µA), but higher gain error (±0.05% typ at G=100) and no SENSE/REF terminals. | Preferred for battery-powered portable sensors; lacks remote sensing and level-shifting capability needed in industrial DAQ. | Choose INA128U for low-power, cost-sensitive designs; AD624ADZ remains optimal for high-accuracy, multi-function industrial signal chains. |
Compared with AD8429ARZ and INA128U, AD624ADZ uniquely combines pin-selectable precision gains, dual-stage offset nulling, and SENSE/REF flexibility-making it irreplaceable in calibrated, multi-range transducer interfaces where DC accuracy and configurability are mandatory.
Availability
AD624ADZ is available at Aetrix Electronics and suitable for industrial weighing systems, high-speed data acquisition front ends, isolated pressure transducer interfaces, and programmable-gain sensor hubs requiring stable component supply and long-term obsolescence management.
Supply support for AD624ADZ 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 AD624 product line was engineered specifically for high-precision, low-drift instrumentation amplifier applications in demanding industrial and scientific measurement systems-emphasizing laser-trimmed accuracy, thermal stability, and robust transducer interface features.
FAQ
What is the maximum gain achievable with AD624ADZ using only internal resistors?
The AD624ADZ supports pretrimmed gains of 1, 100, 200, 500, and 1000 using internal resistors alone. A gain of 1000 is achieved by shorting Pin 11 to Pin 12 and Pins 11 and 13 to RG2, as specified in Table I of the AD624 datasheet. This configuration yields 0 ppm/°C gain temperature coefficient and ±0.25% gain error maximum, making AD624ADZ ideal for applications requiring both high gain and thermal stability.
Does AD624ADZ require external components to achieve gain = 100?
No, AD624ADZ does not require external components to achieve gain = 100. Pin 13 is shorted to Pin 3 (–INPUT) to select G=100, leveraging factory-laser-trimmed internal resistors. This configuration guarantees ±0.15% typical gain error and –1.5 ppm/°C gain temperature coefficient, eliminating calibration drift and reducing design complexity. AD624ADZ thus delivers plug-and-play precision for standardized sensor interfaces.
How does the SENSE terminal improve accuracy in AD624ADZ applications?
The SENSE terminal in AD624ADZ serves as the feedback return point for the output amplifier. When wired directly to the load instead of the amplifier output, it places lead resistance voltage drops inside the feedback loop-causing the amplifier to automatically compensate for IR losses. This eliminates measurement errors caused by long cables or high-current loads, enabling accurate remote sensing in industrial control cabinets or distributed sensor networks using AD624ADZ.
Can AD624ADZ operate from a single +5 V supply?
No, AD624ADZ cannot operate from a single +5 V supply. Its absolute minimum supply is ±6 V (i.e., ±6 V dual rail), and it requires headroom for ±10 V output swing. Attempting operation below ±6 V risks violation of absolute maximum ratings and loss of specified performance-including linearity, CMRR, and output drive capability. For single-supply applications, consider alternatives like AD8420 or INA333, but AD624ADZ is strictly dual-rail optimized.
What is the purpose of the REF terminal in AD624ADZ, and what impedance must drive it?
The REF terminal in AD624ADZ sets the DC level of the output voltage, enabling level shifting up to ±10 V-critical for interfacing with floating loads or matching PLC input ranges. It must be driven with ≤1 Ω source impedance; otherwise, CMRR degrades proportionally (e.g., 10 kΩ/RREF dB loss). A unity-gain op-amp buffer (e.g., AD711) is recommended to meet this requirement while preserving AD624ADZ's 130 dB CMRR at G=500.
AD624ADZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 5V/µs
- Gain Bandwidth Product:
- 25 MHz
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- 50 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 3.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 12 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
AD624ADZ FAQ
1.How can I place an order for AD624ADZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD624ADZ 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 AD624ADZ reliable?
The price and inventory of AD624ADZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD624ADZ is usually 5 days.
3.What payment methods are accepted for AD624ADZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD624ADZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD624ADZ?
AD624ADZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD624ADZ 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 AD624ADZ?
For technical support, including AD624ADZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD624ADZ requirements.
6.How does Aetrix verify that AD624ADZ is sourced from the original manufacturer or authorized distributors?
All AD624ADZ 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 AD624ADZ meets industry standards.
7.What is the process for return or replacement of AD624ADZ?
All AD624ADZ units undergo pre-shipment inspection (PSI). If there is an issue with AD624ADZ, 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 AD624ADZ part is unused and in its original packaging.
Return procedure for AD624ADZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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