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Analog Devices Inc. AD705AZ
- Part No.:
- AD705AZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD705AZ.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:674
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Product details
Overview
AD705AZ from Analog Devices is a precision bipolar operational amplifier optimized for low-frequency, high-DC-accuracy applications. It delivers 25 µV max input offset voltage (AD705T grade), 100 pA max input bias current (AD705K), and 0.15 V/µs slew rate - enabling stable operation in 12- to 14-bit data acquisition systems, precision integrators, and low-frequency active filters.
For engineers reviewing the AD705AZ datasheet, AD705AZ pinout, AD705AZ application, or AD705AZ equivalent, key selection criteria include its picoampere-level input bias current over temperature, internal unity-gain compensation, MIL-STD-883B process option, and compatibility with high-impedance sensor interfaces requiring minimal offset drift.
Technical Context
The AD705AZ employs superbeta bipolar input transistors to achieve BiFET-class input bias current (≤100 pA at +25°C) while maintaining bipolar-level offset voltage (≤25 µV) and drift (≤0.6 µV/°C). Its architecture eliminates the need for input balancing resistors in most configurations due to matched, ultra-low IB across inputs.
Internally compensated for unity-gain stability, it drives up to 10,000 pF capacitive loads and operates from ±2 V to ±18 V supplies. The device supports three temperature grades and multiple 8-pin packages - including hermetic Cerdip (Q-8), used in the AD705AZ variant - with guaranteed performance from –55°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 25 µV max (AD705T grade); enables sub-16-bit DC accuracy without trimming in precision instrumentation. |
| Input Bias Current | 100 pA max (AD705K); supports >100 MΩ source impedances without significant error voltage. |
| Slew Rate | 0.15 V/µs; sufficient for settling <100 µs in 12-bit step responses within low-bandwidth filter/integrator loops. |
| Unity-Gain Bandwidth | 800 kHz; provides stable closed-loop gain ≥1 with no external compensation required. |
| CMRR / PSRR | 114 dB min; rejects power supply ripple and common-mode noise in single-supply or noisy industrial environments. |
| Quiescent Current | 600 µA max; draws one-sixth the supply current of OP07, enabling low-power precision signal conditioning. |
| Capacitive Load Drive | 10,000 pF; allows direct interface to long traces, ADC input buffers, or piezoelectric sensor cables without instability. |
Pinout & Package
AD705AZ is supplied in an 8-pin hermetic Cerdip package (Q-8), rated for military temperature range (–55°C to +125°C) and available with MIL-STD-883B processing. This ceramic dual-in-line package ensures long-term reliability in high-reliability aerospace, defense, and downhole instrumentation applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null (Adjust) | Connects to external potentiometer for fine-tuning input offset voltage; critical for zero-drift calibration in integrators. |
| 2 | Inverting Input (–IN) | Differential input node; high-impedance superbeta bipolar input with ≤100 pA bias current at +25°C. |
| 3 | Noninverting Input (+IN) | Differential input node; matched to Pin 2 for low input offset current (≤100 pA) and high CMRR. |
| 4 | Negative Supply (V–) | Accepts –2 V to –18 V; supports dual-supply operation and rail-to-rail input common-mode range up to ±13.5 V. |
| 5 | Overcompensation | Optional external capacitor connection to increase phase margin for heavy capacitive loads (>10 nF). |
| 6 | Output | Capable of ±13 V swing into 10 kΩ; drives 10,000 pF directly without oscillation or ringing. |
| 7 | Positive Supply (V+) | Accepts +2 V to +18 V; supplies internal bias circuitry and output stage with low quiescent current (600 µA). |
| 8 | Offset Null (Adjust) | Second terminal of offset null potentiometer; used with Pin 1 to balance input transistor pair mismatch. |
Key Features
| Feature | Design Value |
|---|---|
| Superbeta bipolar input stage | Delivers BiFET-level input bias current (100 pA) with 5× lower drift vs. BiFET amplifiers - maintains <1 nA IB even at +125°C. |
| No input balancing resistor required | Eliminates 1% resistor matching, board space, and thermal EMF errors in high-Z sensor front-ends (e.g., pH electrodes, photodiode TIA). |
| MIL-STD-883B processing option | Enables use in flight-critical, space-grade, and harsh-environment systems where burn-in, hermeticity, and radiation tolerance are mandated. |
| Internal unity-gain compensation | Guarantees stability without external components - simplifies design of precision integrators and active filters operating below 1 Hz. |
| Low 0.1–10 Hz noise | 0.5 µV p-p typical; avoids low-frequency drift artifacts in precision weigh scales, thermocouple amplifiers, and medical bio-signal conditioning. |
Applications
| Low-Frequency Active Filters | Precision Instrumentation |
|---|---|
|
Use Scenario: 1 Hz, 2-pole Bessel low-pass filter for anti-aliasing in 14-bit data acquisition systems. IC Role / Device Role / Timing Role: Precision op amp configured as unity-gain follower and integrator in Sallen-Key topology. Use Value: Maintains <0.5 µV p-p 0.1–10 Hz noise and <25 µV offset to preserve SNR and DC accuracy across full temperature range. |
Use Scenario: High-input-impedance differential amplifier for ±135 V common-mode voltage measurement in HV battery monitoring. IC Role / Device Role / Timing Role: Core gain stage in high-CMRR differential front-end with 100 MΩ input resistors. Use Value: Enables >85 dB DC CMR without trimming and supports >10 GΩ effective input impedance due to ≤100 pA IB. |
| Precision Integrators | Thermocouple / RTD Signal Conditioning |
|
Use Scenario: Zero-drift integrator in analog PID controllers for industrial temperature regulation. IC Role / Device Role / Timing Role: Integrating amplifier with external capacitor on feedback path; requires ultra-low IB and offset drift. Use Value: Achieves <0.6 µV/°C offset drift and <100 pA IB to limit integration error to <1 µV/s at +85°C - 10× better than OP07. |
Use Scenario: Cold-junction compensation and linearization amplifier for Type K thermocouples in furnace control. IC Role / Device Role / Timing Role: Low-noise, low-drift gain stage interfacing with 100 Ω platinum RTD bridge. Use Value: Delivers 15 nV/√Hz input voltage noise at 1 kHz and 50 fA/√Hz current noise - preserves microvolt-level thermocouple signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP07EP | Higher 1.2 µV/°C offset drift, 2 nA input bias current, 1.8 mA quiescent current. | Less suitable for >10 MΩ source impedances or battery-powered precision systems. | Select OP07EP only when legacy footprint compatibility is mandatory and power/IB constraints are relaxed. |
| LT1012ACN8#PBF | Chopper-stabilized architecture; 0.2 µV/°C drift, but 1.5 µV p-p 0.1–10 Hz noise and switching artifacts above 10 kHz. | Better for ultra-low-drift DC apps, but unsuitable for low-noise AC-coupled or wideband sensor interfaces. | Choose LT1012ACN8#PBF when sub-0.5 µV/°C drift is critical and chopper noise is acceptable; avoid in active filters or integrators. |
Compared with OP07EP and LT1012ACN8#PBF, AD705AZ uniquely balances picoampere input bias, microvolt offset, low 0.1–10 Hz noise, and unity-gain stability - making it optimal for high-Z, low-power, low-frequency precision circuits where chopper artifacts or excessive IB-induced errors must be avoided.
Availability
AD705AZ is available at Aetrix Electronics and suitable for aerospace avionics, downhole oilfield instrumentation, and military-grade test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD705AZ 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 Norwood, MA, with decades of expertise in precision amplification and signal conditioning.
The AD705AZ belongs to Analog Devices' precision bipolar op amp family, designed specifically for applications demanding BiFET-level input current with bipolar-level offset and noise - bridging the gap between traditional bipolar and FET-input amplifiers.
FAQ
What is the operating temperature range of the AD705AZ?
The AD705AZ is rated for operation from –55°C to +125°C and is processed to MIL-STD-883B, Rev. C. This military-grade temperature range ensures reliable performance in extreme environments such as aerospace guidance systems, engine control units, and deep-well drilling electronics - where standard commercial or industrial op amps would fail.
Does the AD705AZ require an input balancing resistor?
No, the AD705AZ does not require an input balancing resistor due to its matched, ultra-low input bias current (≤100 pA) and low input offset current (≤100 pA). This eliminates resistor-induced thermal EMF, board space, and matching errors - a key advantage over legacy op amps like OP07. However, a balancing network may be added above +110°C per Figure 27 in the datasheet.
Can the AD705AZ drive large capacitive loads?
Yes, the AD705AZ can directly drive up to 10,000 pF capacitive loads while maintaining stability, as confirmed in the "Capacitive Load Drive Capability" specification. This makes it ideal for interfacing with long PCB traces, coaxial cables, or ADC input capacitors without external isolation resistors or compensation networks - a capability verified across all temperature grades including AD705AZ.
How does the AD705AZ compare to the OP07 in power consumption?
The AD705AZ draws only 600 µA maximum quiescent current - approximately one-sixth the supply current of the OP07 (typically 3.5 mA). This dramatic reduction enables battery-powered portable instrumentation, low-power data loggers, and energy-constrained embedded systems to retain high DC precision without sacrificing runtime, making AD705AZ a direct functional upgrade path from OP07 in power-sensitive designs.
Is the AD705AZ pin-compatible with other op amps in its family?
The AD705AZ shares the same 8-pin Cerdip (Q-8) pinout as other AD705 variants (e.g., AD705TQ) and is functionally compatible with industry-standard 8-pin DIP op amp footprints. However, it is not pin-compatible with OP07 or LT1012 due to different offset null pin assignments (Pins 1 & 8 on AD705AZ vs. Pins 1 & 5 on OP07) - PCB layout revision is required for drop-in replacement.
AD705AZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.15V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- 380µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
AD705AZ FAQ
1.How can I place an order for AD705AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD705AZ 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 AD705AZ reliable?
The price and inventory of AD705AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD705AZ is usually 5 days.
3.What payment methods are accepted for AD705AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD705AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD705AZ?
AD705AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD705AZ 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 AD705AZ?
For technical support, including AD705AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD705AZ requirements.
6.How does Aetrix verify that AD705AZ is sourced from the original manufacturer or authorized distributors?
All AD705AZ 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 AD705AZ meets industry standards.
7.What is the process for return or replacement of AD705AZ?
All AD705AZ units undergo pre-shipment inspection (PSI). If there is an issue with AD705AZ, 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 AD705AZ part is unused and in its original packaging.
Return procedure for AD705AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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