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Analog Devices Inc. AD8625ARUZ
- Part No.:
- AD8625ARUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8625ARUZ.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:344
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Product details
Overview
AD8625ARUZ from Analog Devices is a precision quad JFET-input operational amplifier in 14-lead TSSOP (RU) package, designed for low-power, single-supply systems requiring rail-to-rail output swing, <1 pA input bias current, and 5 MHz gain bandwidth. It delivers 500 µV max offset voltage, 630 µA/amp supply current, and operates from 5 V to 26 V single supply or ±2.5 V to ±13 V dual supply - ideal for photodiode transimpedance amplification and precision DAC buffering.
For engineers reviewing the AD8625ARUZ datasheet, AD8625ARUZ pinout, AD8625ARUZ application, or AD8625ARUZ equivalent, key selection criteria include verified picoamp-level input bias stability across temperature, rail-to-rail output capability within 5 mV of rails at 2 mA load, unity-gain stability with >500 pF capacitive drive, and guaranteed −40°C to +85°C industrial operation without phase reversal.
Technical Context
The AD8625ARUZ implements a true JFET-input stage with n-channel devices enabling sub-picoamp input bias current and high input impedance (>1012 Ω), while its bipolar rail-to-rail output stage achieves <5 mV saturation voltage at ±2 mA. Its 5 MHz GBP and 5 V/µs slew rate support fast settling in precision signal conditioning paths.
It features no phase reversal under overdrive, supports input common-mode range extending 0.2 V below V− and 2 V below V+, and maintains stable operation with capacitive loads up to 500 pF - critical for driving ADC inputs, filter stages, and long traces without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA max at 25°C; enables ultra-low-leakage photodiode and high-impedance sensor interfacing without significant DC error. |
| Offset Voltage | 500 µV max; ensures ≤0.01% full-scale error in 5 V-range 14-bit DAC output stages (LSB = 305 µV). |
| Gain Bandwidth Product | 5 MHz; supports stable unity-gain configuration and allows effective settling in <1 µs for 0.1% accuracy in DAC buffer applications. |
| Rail-to-Rail Output Swing | Within 5 mV of rails at ±2 mA load; maximizes dynamic range in single-supply 3.3 V or 5 V systems without negative rail. |
| Supply Current per Amplifier | 630 µA typ; enables four-channel precision amplification at <2.6 mA total quiescent current for battery-powered instrumentation. |
| Input Voltage Range | 0 V to 3 V on 5 V supply; accommodates signals down to ground and up to 2 V below positive rail without CM error degradation. |
| Phase Margin | 60°; guarantees unconditional stability with 500 pF capacitive load - eliminates need for isolation resistors in ADC driver configurations. |
Pinout & Package
AD8625ARUZ is housed in a 14-lead TSSOP (RU suffix) package with exposed pad for thermal enhancement. Pin pitch is 0.65 mm; body dimensions are 5.0 mm × 4.4 mm × 1.2 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT D | Output of fourth amplifier channel; capable of sourcing/sinking ±10 mA with rail-to-rail swing. |
| 2 | –IN D | Inverting input of fourth channel; high-impedance JFET node with <1 pA bias current. |
| 3 | +IN D | Noninverting input of fourth channel; supports common-mode range to V− – 0.2 V. |
| 4 | V− | Negative supply rail; connects to ground or negative supply; reference for all four amplifiers. |
| 5 | +IN C | Noninverting input of third channel; electrically isolated from other inputs to prevent crosstalk. |
| 6 | –IN C | Inverting input of third channel; matched to other inputs for consistent CMRR >87 dB. |
| 7 | OUT C | Output of third amplifier channel; fully specified for capacitive loading up to 500 pF. |
| 8 | V+ | Positive supply rail; accepts 5 V to 26 V single supply or connects to +VS in dual-supply mode. |
| 9 | –IN B | Inverting input of second channel; shares same JFET process as all channels for uniform IB drift. |
| 10 | +IN B | Noninverting input of second channel; supports rail-to-rail input operation with no phase reversal. |
| 11 | OUT B | Output of second amplifier channel; optimized for low noise (17.5 nV/√Hz) and fast settling. |
| 12 | +IN A | Noninverting input of first channel; referenced to same substrate as all inputs for matched TC. |
| 13 | –IN A | Inverting input of first channel; differential pair node with 25 pA max IOS over temperature. |
| 14 | OUT A | Output of first amplifier channel; primary channel used in reference designs for DAC buffering and filter stages. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Guaranteed operation without output polarity inversion when inputs exceed V+ by up to 300 mV - eliminates risk of latch-up in sensor front-ends. |
| Capacitive load drive | Stable with ≥500 pF load without external compensation - simplifies ADC driver layout and reduces BOM count. |
| Low 1/f noise | 1.9 µV p-p (0.1 Hz to 10 Hz); enables high-resolution DC-coupled measurements in strain gauge and thermopile interfaces. |
| Wide supply range | Operates from 5 V to 26 V single supply or ±2.5 V to ±13 V dual supply - supports both line-powered and battery-operated equipment. |
| Industrial temperature grade | Fully specified from −40°C to +85°C - qualified for automotive cabin sensors and industrial PLC analog I/O modules. |
Applications
| Photodiode Signal Conditioning | Precision DAC Output Buffering |
|---|---|
Use Scenario: Amplifying weak current from reverse-biased photodiodes in optical smoke detectors and spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1.5 MΩ feedback resistor; converts photocurrent to precise voltage with minimal input error. Use Value: 1 pA input bias contributes <1.5 µV output error; 500 µV offset adds <0.75 mV error - enabling 95 dB SNR at 30 kHz bandwidth. | Use Scenario: Driving unipolar 14-bit DAC outputs (e.g., AD5551) in portable medical monitors and portable test equipment. IC Role / Device Role / Timing Role: Rail-to-rail output buffer with 5 V/µs slew rate; ensures full-scale step settles within 1 µs to 0.1%. Use Value: 630 µA/amp supply current enables four-channel buffering at <2.6 mA total - extending battery life in handheld instruments. |
| 8-Pole Precision Low-Pass Filtering | Automotive Sensor Signal Conditioning |
Use Scenario: Implementing 10 Hz anti-aliasing filters in high-accuracy data loggers for structural health monitoring. IC Role / Device Role / Timing Role: Quad op-amp configured as cascaded Sallen-Key stages; each section uses one AD8625ARUZ channel. Use Value: Picoamp input bias allows use of >100 kΩ resistors and >100 µF capacitors - minimizing thermal noise and component sensitivity. | Use Scenario: Conditioning signals from piezoresistive pressure sensors in engine control units and brake-by-wire systems. IC Role / Device Role / Timing Role: Instrumentation-grade signal conditioner with 87 dB CMRR and 104 dB PSRR - rejecting ignition noise and alternator ripple. Use Value: −40°C to +85°C operation with <2.5 µV/°C offset drift ensures calibration stability across vehicle thermal cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision JFET op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8626ARMZ | Dual-channel MSOP-8; identical electrical specs but fewer channels and different package thermal resistance (θJA = 210°C/W vs. 180°C/W). | Suitable where only two amplifiers are needed and board space is constrained; not drop-in for quad-channel layouts. | Select AD8626ARMZ when reducing channel count lowers system cost and PCB area without sacrificing precision. |
| OPA211AIDGKR | Bipolar-input architecture; lower voltage noise (1.1 nV/√Hz) but higher input bias (±3.5 nA); 1.1 MHz GBP vs. 5 MHz. | Better for low-source-impedance, wideband applications; unsuitable for photodiode or high-Z sensor nodes due to IB mismatch. | Choose OPA211AIDGKR only for low-noise, low-offset applications with source impedances <10 kΩ and bandwidth <1 MHz. |
Compared with AD8626ARMZ, AD8625ARUZ provides two additional independent amplifier channels in a thermally optimized TSSOP package, while OPA211AIDGKR trades JFET-level input impedance for superior voltage noise - making AD8625ARUZ uniquely suited for high-impedance, wide-swing, multi-channel precision signal chains.
Availability
AD8625ARUZ is available at Aetrix Electronics and suitable for photodiode amplification, precision DAC buffering, and 8-pole active filtering requiring stable component supply across industrial, test & measurement, and automotive sensor programs.
Supply support for AD8625ARUZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD862x family was engineered specifically for low-power, single-supply precision signal conditioning - targeting photodiode preamps, battery-powered instrumentation, and automotive sensor interfaces where picoamp input bias and rail-to-rail output are mandatory.
FAQ
What is the maximum capacitive load the AD8625ARUZ can drive without instability?
The AD8625ARUZ is specified to remain stable with capacitive loads up to 500 pF without external compensation. This is confirmed in the datasheet's Typical Performance Characteristics (Figure 31–32) and Applications Information section, which states "outputs remain stable with capacitive loads of over 500 pF." For loads exceeding this, a series isolation resistor (e.g., 10–50 Ω) between the AD8625ARUZ output and the capacitor is recommended to maintain phase margin above 60°.
Does the AD8625ARUZ support true rail-to-rail input operation?
The AD8625ARUZ does not support rail-to-rail input - its input common-mode voltage range extends from 0.2 V below V− to 2 V below V+. On a 5 V supply, this means usable input range is 0 V to 3 V. Driving the input within 2 V of V+ increases common-mode error and reduces bandwidth, as shown in Figure 15 of the datasheet. The device does provide rail-to-rail *output* swing, however.
What is the typical supply current for the AD8625ARUZ at 25°C and 5 V supply?
The typical supply current per amplifier for the AD8625ARUZ is 630 µA at 25°C and 5 V supply, resulting in ~2.52 mA total for all four channels. This value is specified in Table 1 (Electrical Characteristics) under "Supply Current/Amplifier" and is confirmed in Figure 16 (Quiescent Current vs. Supply Voltage). At −40°C to +85°C, the maximum is 800 µA per amplifier.
Can the AD8625ARUZ be used in dual-supply configurations?
Yes, the AD8625ARUZ supports dual-supply operation from ±2.5 V to ±13 V. Electrical characteristics are fully specified under both single-supply (5 V to 26 V) and dual-supply conditions in Tables 1 and 2 of the datasheet. Input voltage range expands to −13 V to +11 V on ±13 V supplies, and output swing reaches ±12.92 V at ±2 mA load.
Is the AD8625ARUZ pin-compatible with other AD862x variants like AD8626 or AD8627?
No, the AD8625ARUZ is not pin-compatible with AD8626 or AD8627. AD8625ARUZ is a 14-lead quad amplifier in TSSOP (RU), AD8626 is an 8-lead dual in SOIC or MSOP (R/RM), and AD8627 is a 5-lead or 8-lead single in SC70 or SOIC (KS/R). Pin counts, channel counts, and pin assignments differ fundamentally - PCB layout must be redesigned for any variant swap.
AD8625ARUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 5V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.25 pA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 710µA (x4 Channels)
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 26 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
AD8625ARUZ FAQ
1.How can I place an order for AD8625ARUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8625ARUZ 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 AD8625ARUZ reliable?
The price and inventory of AD8625ARUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8625ARUZ is usually 5 days.
3.What payment methods are accepted for AD8625ARUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8625ARUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8625ARUZ?
AD8625ARUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8625ARUZ 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 AD8625ARUZ?
For technical support, including AD8625ARUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8625ARUZ requirements.
6.How does Aetrix verify that AD8625ARUZ is sourced from the original manufacturer or authorized distributors?
All AD8625ARUZ 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 AD8625ARUZ meets industry standards.
7.What is the process for return or replacement of AD8625ARUZ?
All AD8625ARUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8625ARUZ, 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 AD8625ARUZ part is unused and in its original packaging.
Return procedure for AD8625ARUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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