AD705JN Analog Devices Integrated Circuit (Dual-In-Line Packages) In Stock
Analog Devices AD705JN is a single-channel, precision voltage-feedback operational amplifier featuring 128 dB typical CMRR, 150 µV maximum offset voltage, and 0.2 nA bias current. Housed in a DIP-8 package, it delivers ultra-low noise and drift for high-accuracy instrumentation and medical measurement applications.
- Manufacturer
- Analog Devices
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- AD705JN Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 128 dB typical CMRR for exceptional common-mode noise rejection
- 150 µV maximum input offset voltage for precision low-level signal amplification
- 0.2 nA maximum bias current at 25°C minimizes error with high-impedance sources
- Single-channel voltage-feedback architecture for stable precision circuits
- Frequency compensation for unity-gain stability without external components
- DIP-8 through-hole package for prototyping and legacy precision instrument PCBs
Applications
The AD705JN is engineered for precision DC and low-frequency measurement applications where offset voltage, bias current, and common-mode rejection are the dominant error sources. It excels in thermocouple amplifiers, strain-gauge signal conditioners, and medical ECG front-ends where 128 dB CMRR suppresses 50/60 Hz power-line interference to sub-microvolt levels. Electrometer circuits and pH meter input stages also leverage its 0.2 nA bias current to avoid loading high-impedance ion-selective electrodes above 1 GΩ.
Specifications
| YTEOL | 0 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | VOLTAGE-FEEDBACK |
| Average Bias Current-Max (IIB) | 0.00045 µA |
| Bias Current-Max (IIB) @25C | 0.0002 µA |
| Common-mode Reject Ratio-Min | 108dB |
| Common-mode Reject Ratio-Nom | 128dB |
| Frequency Compensation | YES |
| Input Offset Voltage-Max | 150 µV |
| JESD-30 Code | R-PDIP-T8 |
| JESD-609 Code | e0 |
| Low-Bias | YES |
| Low-Offset | YES |
| Micropower | YES |
| Neg Supply Voltage Limit-Max | -18 V |
| Neg Supply Voltage-Nom (Vsup) | -15 V |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Power | NO |
| Programmable Power | NO |
| Qualification Status | Not Qualified |
| Slew Rate-Min | 0.05V/us |
| Slew Rate-Nom | 0.15V/us |
| Supply Current-Max | 0.8mA |
| Supply Voltage Limit-Max | 18V |
| Supply Voltage-Nom (Vsup) | 15V |
| Surface Mount | NO |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | TIN LEAD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Unity Gain BW-Nom | 800 |
| Voltage Gain-Min | 150000 |
| Wideband | NO |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the 128 dB CMRR of the AD705JN benefit 50 Hz power-line interference rejection in a medical ECG circuit?
With 128 dB CMRR, the AD705JN attenuates a 1 V peak common-mode 50 Hz signal at the input to approximately 0.25 µV at the output, well below the typical 1 mV ECG signal amplitude. This level of rejection eliminates the need for bulky analog notch filters in many single-supply ECG front-end designs, simplifying the signal chain to a two-op-amp instrumentation configuration.
What maximum input offset voltage does the AD705JN specify, and how does it affect a millivolt-level thermocouple amplifier?
The AD705JN specifies a maximum 150 µV input offset voltage, which adds a fixed DC error of 150 µV referred to the input. For a K-type thermocouple with a sensitivity of 41 µV/°C, this offset introduces a worst-case temperature error of approximately 3.7°C without compensation. Designers using autozero techniques or offset trim can reduce this error to less than 0.5°C in precision temperature measurement applications.
For a pH electrode with 1 GΩ source impedance, how does the AD705JN's bias current affect measurement accuracy?
The AD705JN has a maximum bias current of 0.2 nA at 25°C, which flowing through a 1 GΩ pH electrode source impedance generates a maximum 200 mV error voltage — far too large for pH measurement. In practice, designers place a unity-gain electrometer buffer between the electrode and the AD705JN, reducing the effective source impedance seen by the op-amp to below 1 kΩ and limiting bias-current-induced error to well under 1 µV.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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