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Analog Devices Inc. AD795JRZ-REEL7
- Part No.:
- AD795JRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD795JRZ-REEL7.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,503
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Product details
Overview
AD795JRZ-REEL7 from Analog Devices is a precision FET-input operational amplifier optimized for low-noise, high-input-impedance signal conditioning. It delivers 3.3 μV p-p input voltage noise (0.1 Hz to 10 Hz), 2 pA maximum input bias current, and 500 μV maximum input offset voltage at +25°C, enabling accurate photodiode preamplification and precision current-to-voltage conversion in CT scanners and analytical instrumentation.
For engineers reviewing the AD795JRZ-REEL7 datasheet, AD795JRZ-REEL7 pinout, AD795JRZ-REEL7 application, or AD795JRZ-REEL7 equivalent, key selection criteria include guaranteed low-frequency voltage noise, sub-picoampere input bias current stability over temperature, rail-to-rail common-mode input range up to ±11 V, and SOIC-8 packaging compatible with automated SMT assembly for medical and test equipment designs.
Technical Context
The AD795JRZ-REEL7 employs a JFET-input stage delivering 10¹⁴ Ω common-mode input impedance and 10¹² Ω differential impedance, ensuring bias current independence from supply and common-mode voltage variations. Its fully tested noise performance includes 11 nV/√Hz maximum at 10 kHz and 0.6 fA/√Hz current noise at 1 kHz.
DC precision is maintained via 10 μV/°C maximum offset drift and 86 dB minimum PSRR across temperature. The device operates from ±4 V to ±18 V supplies, draws ≤1.5 mA quiescent current, and achieves 1.6 MHz unity-gain bandwidth with 1 V/μs slew rate-optimized for stable operation with high-value feedback networks in transimpedance configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 3.3 μV p-p (0.1 Hz–10 Hz): enables resolution of ultra-low-level DC-coupled signals in photodiode and pH probe applications |
| Input Bias Current | 2 pA max at +25°C: supports >1 GΩ feedback resistors without significant DC error in I-to-V converters |
| Input Offset Voltage | 500 μV max at +25°C: ensures <0.5 mV output error in unity-gain buffer configurations with ±10 V output swing |
| Supply Current | 1.5 mA max: allows integration into power-constrained portable instrumentation without thermal derating |
| Unity-Gain Bandwidth | 1.6 MHz: provides sufficient small-signal response for 10 kHz sensor signal conditioning with phase margin >60° |
| Common-Mode Range | ±11 V at ±15 V supply: accommodates high-voltage sensor outputs while maintaining FET-input integrity |
| Output Swing | VS − 2.5 V min (RL ≥ 2 kΩ): delivers ±12.5 V linear output with ±15 V rails for dynamic range preservation |
Pinout & Package
AD795JRZ-REEL7 is housed in an 8-lead SOIC (R) package with standard JEDEC MS-012AC dimensions (4.9 mm × 3.9 mm × 1.75 mm). Pin 1, Pin 5, and Pin 8 are no-connect terminals and may be tied to analog ground or driven guard traces to minimize leakage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | Internally unconnected; recommended for guard trace connection to reduce PCB surface leakage |
| 2 | Inverting Input (−IN) | High-impedance FET node; requires guarded routing and clean PCB layout to preserve pA-level bias current |
| 3 | Noninverting Input (+IN) | Differential input terminal with 10¹⁴ Ω common-mode impedance; sensitive to contamination and humidity |
| 4 | Negative Supply (−VS) | Power rail connection; decoupling capacitor required within 1 cm for noise suppression |
| 5 | No Connect | Internally unconnected; usable as additional guard point in high-impedance layouts |
| 6 | Output | Class AB output stage capable of ±10 mA drive into 2 kΩ load; limited short-circuit current protects against latch-up |
| 7 | Positive Supply (+VS) | Power rail connection; requires local 0.1 μF ceramic decoupling adjacent to pin |
| 8 | No Connect | Internally unconnected; may be bonded to guard plane to shield input pins from substrate coupling |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed low-frequency voltage noise | 3.3 μV p-p (0.1 Hz–10 Hz) specified and tested-enables stable baseline in DC-coupled photodiode preamps |
| FET-input bias current stability | 2 pA max at +25°C with predictable doubling per 10°C rise-allows accurate thermal error modeling in sealed sensors |
| High common-mode impedance | 10¹⁴ Ω common-mode resistance isolates input bias current from supply and CM voltage shifts |
| Offset voltage drift control | 10 μV/°C max drift ensures <70 μV total offset variation across 0°C to +70°C commercial range |
| Low-power precision operation | 1.5 mA max supply current at ±15 V enables battery-powered portable analyzers without sacrificing dc accuracy |
Applications
| Photodiode Preamplifier | CT Scanner Signal Chain |
|---|---|
Use Scenario: Amplifying weak current signals from silicon photodiodes in radiation detection modules, where dark current and Johnson noise dominate system noise floor. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photodiode current to voltage with 1 GΩ feedback resistor and 10 pF compensation capacitance. Use Value: 2 pA input bias current prevents >2 mV output error; 3.3 μV p-p low-frequency noise preserves signal integrity in sub-Hz pulse detection. | Use Scenario: Conditioning analog outputs from scintillation detector arrays before ADC sampling in computed tomography gantries. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with offset nulling, driving multiplexed 16-bit SAR ADC inputs. Use Value: 500 μV max offset voltage limits calibration drift; ±11 V common-mode range accommodates detector bias offsets without level-shifting. |
| Precision l-to-V Converter | pH Probe Buffer |
Use Scenario: Converting nanoamp-level electrochemical sensor currents into calibrated voltage outputs for industrial process controllers. IC Role / Device Role / Timing Role: High-impedance current sink with guarded input traces and Teflon standoff mounting to suppress leakage. Use Value: 10¹⁴ Ω input impedance prevents loading of high-Z sensors; 0.6 fA/√Hz current noise minimizes contribution to total system noise. | Use Scenario: Isolating and buffering millivolt-level Nernst potentials from glass pH electrodes in laboratory analyzers. IC Role / Device Role / Timing Role: Unity-gain follower with input guard ring and baked-clean PCB to maintain pA-level input current. Use Value: 10 μV/°C max offset drift ensures <0.7 mV error over 70°C operating range; low 11 nV/√Hz noise avoids masking pH resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision FET op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA128SM | Lower 1.1 μV p-p (0.1–10 Hz) noise but higher 3.5 mA supply current; 8-lead CERDIP package only | Better noise performance for ultra-low-light detection; unsuitable for space-constrained SOIC layouts | Select OPA128SM only when sub-2 μV p-p noise is mandatory and board area allows CERDIP mounting |
| LTC1052CS8#PBF | Chopper-stabilized architecture eliminates 10 μV/°C drift but adds 1.5 μV p-p switching noise at 100 kHz | Superior long-term DC stability in environmental monitoring; introduces spectral artifacts incompatible with broadband photodiode signals | Choose LTC1052CS8#PBF for zero-drift DC applications where chopper noise falls outside signal band |
Compared with OPA128SM and LTC1052CS8#PBF, AD795JRZ-REEL7 uniquely balances ultra-low input current (2 pA), verified low-frequency noise (3.3 μV p-p), and SOIC-8 manufacturability-making it optimal for cost-sensitive, high-volume medical and test equipment requiring validated FET-input performance without chopper artifacts or high power dissipation.
Availability
AD795JRZ-REEL7 is available at Aetrix Electronics and suitable for photodiode preamplifiers, CT scanner front-ends, and precision current-to-voltage converters requiring stable component supply across medical OEM production cycles, industrial analyzer field deployments, and laboratory instrument service programs.
Supply support for AD795JRZ-REEL7 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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and signal conditioning.
The AD795JRZ-REEL7 belongs to Analog Devices' precision FET op amp product line, engineered specifically for applications demanding ultra-low input bias current, guaranteed low-frequency voltage noise, and stable DC performance in medical imaging, analytical instrumentation, and scientific measurement systems.
FAQ
What is the maximum guaranteed input bias current for AD795JRZ-REEL7 at +70°C?
The AD795JRZ-REEL7 has a maximum input bias current of 23 pA at +70°C, as specified in Table 1 of the Rev. D datasheet under "Either Input at TMAX = 70°C" test condition. This value reflects worst-case behavior after 5 minutes of operation and accounts for the typical doubling of bias current per 10°C rise above +25°C. Designers must verify thermal management to avoid exceeding this limit in enclosed CT scanner modules.
Does AD795JRZ-REEL7 support rail-to-rail input operation?
AD795JRZ-REEL7 does not support true rail-to-rail input operation. Its common-mode input voltage range is specified as ±11 V with ±15 V supplies (Figure 4), meaning inputs must remain within 4 V of either supply rail. Exceeding ±11 V risks phase reversal or increased bias current. For applications requiring full rail compliance, designers should consider alternative amplifiers like the ADA4522-1, which explicitly specifies rail-to-rail input capability.
Can AD795JRZ-REEL7 be used in single-supply configurations?
Yes, AD795JRZ-REEL7 operates with single supplies down to +8 V (±4 V equivalent) per the Absolute Maximum Ratings table, but its input common-mode and output swing ranges are asymmetric. When using +5 V/0 V supplies, the input must stay between +1 V and +4 V, and output swing is limited to ~+0.5 V to +4.5 V. Successful single-supply use requires careful biasing of the noninverting input and verification of headroom margins in the target application circuit.
What is the purpose of the NC pins (1, 5, 8) on AD795JRZ-REEL7?
The NC pins (1, 5, 8) on AD795JRZ-REEL7 are internally unconnected and serve as guard points in high-impedance layouts. Per Figure 34 and Figure 35 of the datasheet, they can be tied to the driven guard trace surrounding the +IN and −IN traces to reduce PCB surface leakage currents that would otherwise exceed the 2 pA input bias current specification. This practice is critical for maintaining pA-level resolution in photodiode and pH probe circuits.
How does AD795JRZ-REEL7 handle overload recovery?
AD795JRZ-REEL7 recovers from 50% input overload in 2 μs, as defined in Table 1 under "Overload Recovery" with the note "Defined as the time required for the amplifier's output to return to normal operation after removal of a 50% overload from the amplifier input." This fast recovery supports high-speed pulse applications such as CT detector readout, where transient settling directly impacts image fidelity and temporal resolution.
AD795JRZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.6 MHz
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 1.3mA
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD795JRZ-REEL7 FAQ
1.How can I place an order for AD795JRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD795JRZ-REEL7 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 AD795JRZ-REEL7 reliable?
The price and inventory of AD795JRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD795JRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD795JRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD795JRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD795JRZ-REEL7?
AD795JRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD795JRZ-REEL7 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 AD795JRZ-REEL7?
For technical support, including AD795JRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD795JRZ-REEL7 requirements.
6.How does Aetrix verify that AD795JRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD795JRZ-REEL7 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 AD795JRZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD795JRZ-REEL7?
All AD795JRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD795JRZ-REEL7, 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 AD795JRZ-REEL7 part is unused and in its original packaging.
Return procedure for AD795JRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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