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Analog Devices Inc. AD8508ARUZ-REEL
- Part No.:
- AD8508ARUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8508ARUZ-REEL.pdf
- Description:
- IC CMOS 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,613
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Product details
Overview
AD8508ARUZ-REEL from Analog Devices is a quad-channel, rail-to-rail input/output CMOS operational amplifier optimized for ultra-low-power, precision sensing in battery-powered systems. It delivers 20 μA maximum supply current per amplifier, 2.5 mV max offset voltage, 45 nV/√Hz voltage noise at 1 kHz, and operates from 1.8 V to 5 V single supply - enabling high-accuracy signal conditioning in pressure sensors and IR thermometers.
For engineers reviewing the AD8508ARUZ-REEL datasheet, AD8508ARUZ-REEL pinout, AD8508ARUZ-REEL application, or AD8508ARUZ-REEL equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for low-voltage, micro-power op amp selection.
Technical Context
The AD8508ARUZ-REEL employs an on-chip charge pump to eliminate input crossover distortion across the full rail-to-rail common-mode range (0 V to VSY), unlike conventional dual-differential-pair architectures. This enables consistent CMRR ≥85 dB and PSRR ≥100 dB over temperature and supply voltage variation.
Its unity-gain-stable architecture achieves 95 kHz gain-bandwidth product and 60° phase margin with 1 MΩ load and 20 pF capacitance, while maintaining rail-to-rail output swing within 5 mV of rails at 100 kΩ load - critical for interfacing with low-voltage ADCs and microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 20 μA per amplifier max - enables >10-year battery life in coin-cell–powered sensor nodes. |
| Input Offset Voltage | 2.5 mV max at 25°C - ensures ≤0.5% error in 0.5 V full-scale sensor outputs without trimming. |
| Voltage Noise Density | 45 nV/√Hz at 1 kHz - supports sub-μV-level resolution in bio-sensor front-ends. |
| CMRR / PSRR | 105 dB typical CMRR, 100 dB min PSRR - rejects supply ripple and common-mode interference in noisy industrial environments. |
| Operating Supply | 1.8 V to 5 V single supply - compatible with Li-ion, alkaline, and coin-cell batteries across discharge curves. |
| Input Bias Current | 1 pA typical - preserves signal integrity in high-impedance pH or photodiode sensor interfaces. |
| Output Swing | Rail-to-rail, within 5 mV of rails at 100 kΩ - maximizes dynamic range into 12-bit+ SAR ADCs. |
Pinout & Package
AD8508ARUZ-REEL is packaged in a 14-lead TSSOP (RU-14) with exposed pad for thermal performance. Pin numbering follows standard JEDEC top-view orientation with Pin 1 marked by a dot or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives low-impedance loads up to ±4.5 mA short-circuit current. |
| 2 | –IN A | Inverting input for Amp A - accepts rail-to-rail common-mode signals (0 V to VSY). |
| 3 | +IN A | Non-inverting input for Amp A - 220 GΩ input resistance minimizes loading on high-Z sources. |
| 4 | V+ | Positive supply rail - connects to main system VDD; decoupling capacitor required. |
| 5 | +IN B | Non-inverting input for Amp B - electrically isolated from other channels; supports independent biasing. |
| 6 | –IN B | Inverting input for Amp B - matched input capacitance (3 pF diff, 4.2 pF common-mode) ensures balanced AC response. |
| 7 | OUT B | Amplifier B output - identical drive capability and rail-to-rail swing as OUT A. |
| 8 | V– | Negative supply rail (GND) - must be connected directly to low-impedance ground plane. |
| 9 | OUT C | Amplifier C output - shares same electrical specs and thermal characteristics as OUT A/B. |
| 10 | –IN C | Inverting input for Amp C - supports multi-channel synchronous sampling without crosstalk degradation. |
| 11 | +IN C | Non-inverting input for Amp C - channel separation >100 dB at 10 kHz ensures minimal inter-channel coupling. |
| 12 | +IN D | Non-inverting input for Amp D - enables four independent sensor signal paths on one die. |
| 13 | –IN D | Inverting input for Amp D - fully specified for −40°C to +125°C operation with <100 pA bias current drift. |
| 14 | OUT D | Amplifier D output - completes quad configuration; all four outputs are internally isolated and independently stable. |
Key Features
| Feature | Design Value |
|---|---|
| Zero input crossover distortion | Enabled by internal charge pump - eliminates distortion artifacts at rail transitions, preserving signal fidelity in DC-coupled sensor paths. |
| Rail-to-rail I/O | Full 0 V to VSY input range and output swing within 5 mV of rails - maximizes usable ADC input range in 1.8 V systems. |
| Ultra-low power | 20 μA per amplifier max at 25°C - reduces total quiescent current to 80 μA for quad configuration, extending battery life. |
| High PSRR/CMRR | 100 dB min PSRR and 105 dB typical CMRR - maintains accuracy despite supply noise and EMI in portable medical devices. |
| Low input bias current | 1 pA typical - prevents voltage drop across >100 MΩ sensor elements (e.g., electrochemical gas sensors). |
| Wide temperature range | Specified from −40°C to +125°C - supports deployment in automotive cabin modules and industrial process controllers. |
Applications
| Pressure and Position Sensors | Bio Sensors |
|---|---|
Use Scenario: Amplifying mV-level bridge outputs from MEMS pressure transducers in wearable health monitors. IC Role / Device Role / Timing Role: Precision instrumentation amplifier stage with rail-to-rail input to capture full bridge swing under varying battery voltage. Use Value: 20 μA per amplifier enables continuous monitoring for >3 months on CR2032; zero crossover distortion prevents false alarms during low-VDD operation. |
Use Scenario: Front-end amplification of low-current signals from glucose oxidase electrodes in point-of-care diagnostics. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1 pA input bias current to avoid electrode polarization errors. Use Value: 45 nV/√Hz noise density supports detection of sub-nA currents; 1.8 V operation matches low-power MCU supply domains. |
| IR Thermometers | Hazard Detectors |
Use Scenario: Conditioning thermopile output in non-contact fever screening devices powered by two AAA cells. IC Role / Device Role / Timing Role: DC-coupled, low-drift amplifier with 2.5 mV max VOS to resolve <0.1°C temperature changes. Use Value: 105 dB CMRR rejects ambient EMI from display backlighting; rail-to-rail output drives 12-bit internal ADC of host MCU. |
Use Scenario: Signal conditioning for smoke particle ionization chambers in battery-operated residential fire alarms. IC Role / Device Role / Timing Role: Low-power comparator input buffer with stable offset over battery discharge (1.8 V to 3.2 V). Use Value: 100 dB PSRR ensures immunity to supply sag during alarm siren activation; −40°C to +125°C rating covers attic installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micro-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4505-4ARUZ | Same 14-lead TSSOP package; 15 μA per amplifier typical supply current; 1.5 mV max VOS; requires ≥2.2 V supply. | Better offset and lower current, but narrower supply range limits use with 1.8 V logic or depleted batteries. | Select ADA4505-4ARUZ when supply stays ≥2.2 V and sub-mV offset is critical; AD8508ARUZ-REEL preferred for true 1.8 V start-up and wider battery range. |
| TSV914IQ4T | Quad rail-to-rail op amp in 14-lead TSSOP; 55 μA per amplifier; 3.5 mV max VOS; 8 MHz GBP; no charge pump. | Higher speed and drive strength, but 2.75× higher supply current and no zero-crossover architecture. | Choose TSV914IQ4T for bandwidth-critical applications like active filters; AD8508ARUZ-REEL remains optimal for micro-power, low-distortion DC sensing. |
Compared with ADA4505-4ARUZ and TSV914IQ4T, AD8508ARUZ-REEL uniquely balances 1.8 V operability, zero-crossover linearity, and 20 μA quiescent current - making it the only option qualified for long-life, low-voltage, high-fidelity sensor front-ends where both supply headroom and distortion-free DC accuracy are constrained.
Availability
AD8508ARUZ-REEL is available at Aetrix Electronics and suitable for pressure sensors, bio-sensors, IR thermometers, and hazard detectors requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for AD8508ARUZ-REEL 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 AD8508ARUZ-REEL belongs to Analog Devices' zero-crossover distortion op amp family, engineered specifically for ultra-low-power, high-precision signal conditioning in battery-constrained applications such as portable medical devices and environmental sensors.
FAQ
What is the operating temperature range for AD8508ARUZ-REEL?
The AD8508ARUZ-REEL is fully specified from −40°C to +125°C, supporting deployment in automotive, industrial, and outdoor environments. Electrical parameters including offset voltage, bias current, and PSRR are guaranteed across this extended industrial range, with no derating required at temperature extremes.
Does AD8508ARUZ-REEL require external components for stability?
No. The AD8508ARUZ-REEL is unity-gain stable and does not require external compensation. It maintains ≥60° phase margin with 1 MΩ load and 20 pF capacitive load, as verified in the datasheet's Figure 28 and Figure 29. A 100 nF ceramic decoupling capacitor on V+ is recommended for robust PSRR performance.
How does the charge pump in AD8508ARUZ-REEL affect noise performance?
The on-chip charge pump in AD8508ARUZ-REEL is designed so that switching noise remains below the thermal noise floor (45 nV/√Hz). As confirmed in the datasheet's Theory of Operation section and Figure 42, no intermodulation or spurious tones appear - ensuring the measured voltage noise density reflects only intrinsic device physics, not pump artifacts.
Can AD8508ARUZ-REEL drive capacitive loads directly?
Yes - AD8508ARUZ-REEL drives up to 200 pF capacitive load while maintaining stability and <10% overshoot, as shown in Figure 33 and Figure 36. For loads >200 pF, a small series resistor (10–50 Ω) between output and capacitance restores phase margin without degrading DC accuracy.
Is AD8508ARUZ-REEL pin-compatible with other quad op amps in TSSOP-14?
No - AD8508ARUZ-REEL uses a proprietary pinout optimized for low crosstalk and thermal symmetry (see Figure 5). It is not pin-compatible with generic quad op amps like LM324 or MCP6004. Layout must follow the exact pin mapping provided in the AD8508 datasheet to ensure proper channel isolation and performance.
AD8508ARUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.013V/µs
- Gain Bandwidth Product:
- 95 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 15µA (x4 Channels)
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
AD8508ARUZ-REEL FAQ
1.How can I place an order for AD8508ARUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8508ARUZ-REEL 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 AD8508ARUZ-REEL reliable?
The price and inventory of AD8508ARUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8508ARUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD8508ARUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8508ARUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8508ARUZ-REEL?
AD8508ARUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8508ARUZ-REEL 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 AD8508ARUZ-REEL?
For technical support, including AD8508ARUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8508ARUZ-REEL requirements.
6.How does Aetrix verify that AD8508ARUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD8508ARUZ-REEL 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 AD8508ARUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD8508ARUZ-REEL?
All AD8508ARUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8508ARUZ-REEL, 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 AD8508ARUZ-REEL part is unused and in its original packaging.
Return procedure for AD8508ARUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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