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Analog Devices Inc. AD8574ARU
- Part No.:
- AD8574ARU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8574ARU.pdf
- Description:
- IC OPAMP ZER-DRIFT 4CIRC 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,512
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Product details
Overview
AD8574ARU from Analog Devices is a quad zero-drift, rail-to-rail input/output operational amplifier optimized for precision dc-coupled signal conditioning in single-supply systems. It delivers 1 μV typical offset voltage, 0.005 μV/°C drift, 145 dB open-loop gain, and operates from 2.7 V to 5 V with 750 μA per amplifier supply current - enabling high-accuracy sensor front-ends such as strain gage or thermocouple amplifiers.
For engineers reviewing the AD8574ARU datasheet, AD8574ARU pinout, AD8574ARU application, or AD8574ARU equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions for TSSOP-14 layout, confirmed alternatives for precision analog redesigns, and supply-chain support for industrial instrumentation programs.
Technical Context
The AD8574ARU uses a spread-spectrum random auto-zero architecture with dual internal amplifiers: a main amplifier and a nulling amplifier that samples and cancels offset in alternating phases. This eliminates 1/f noise and intermodulation distortion while maintaining ultralow drift across −40°C to +125°C.
Its rail-to-rail input stage combines NMOS and PMOS differential pairs to achieve full 0 V to VS common-mode range; the output stage employs common-source transistors delivering VOH ≥ 4.95 V and VOL ≤ 30 mV at 10 kΩ load under 5 V supply - with short-circuit protection up to ±50 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 1 μV typical - enables sub-μV error budget in 100× gain sensor interfaces without calibration. |
| Offset Drift | 0.005 μV/°C - ensures <0.6 μV total drift over −40°C to +125°C, critical for uncalibrated automotive sensors. |
| Open-Loop Gain | 145 dB typical - supports stable closed-loop gain ≥1000 with <0.01% gain error in precision instrumentation. |
| CMRR / PSRR | 140 dB / 130 dB typical - rejects power supply ripple and common-mode interference in noisy industrial environments. |
| Supply Current | 750 μA per amplifier at 2.7 V - allows four-channel precision amplification within 3 mA total budget for battery-powered devices. |
| Output Swing | Rail-to-rail: VOL ≤ 30 mV, VOH ≥ 4.95 V at 10 kΩ (5 V) - preserves dynamic range in single-supply ADC driver stages. |
| Gain Bandwidth | 1.5 MHz at 5 V - sufficient for DC–10 kHz sensor signals with phase margin >60° in unity-gain stable configurations. |
Pinout & Package
AD8574ARU is packaged in a 14-lead TSSOP (RU suffix), 5.0 mm × 4.4 mm body, 0.65 mm pitch, with exposed pad for thermal enhancement. Pin 1 is marked by dot or bevelled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Inverting output of Channel A; drives external load or feedback network with rail-to-rail swing. |
| 2 | −IN A | Inverting input of Channel A; accepts feedback or signal source with 0–5 V common-mode range. |
| 3 | +IN A | Noninverting input of Channel A; connects to reference or sensor node with same CM range. |
| 4 | V+ | Positive supply rail (2.7–5 V); decoupling capacitor required near pin for stability. |
| 5 | +IN B | Noninverting input of Channel B; electrically isolated from other channels, supports independent biasing. |
| 6 | −IN B | Inverting input of Channel B; used for differential or single-ended configurations per channel. |
| 7 | OUT B | Output of Channel B; shares no internal nodes with Channels A/C/D - true quad isolation. |
| 8 | V− | Negative supply rail (GND in single-supply mode); low-impedance return path for all four amplifiers. |
| 9 | OUT C | Output of Channel C; fully independent; supports simultaneous multi-channel acquisition. |
| 10 | −IN C | Inverting input of Channel C; compatible with active filtering or programmable gain stages. |
| 11 | +IN C | Noninverting input of Channel C; referenced to same V− as all channels for common-mode consistency. |
| 12 | +IN D | Noninverting input of Channel D; enables four independent sensor inputs on one IC. |
| 13 | −IN D | Inverting input of Channel D; supports matched resistor networks for differential sensing. |
| 14 | OUT D | Output of Channel D; completes quad functionality with identical spec compliance per channel. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitors required | Internal auto-zero capacitor eliminates need for external timing or storage caps - reduces BOM count and PCB area. |
| Rail-to-rail I/O at 2.7 V | Operates down to 2.7 V while maintaining full input/output swing - enables direct interface with 3.3 V microcontrollers and SAR ADCs. |
| Ultralow 1/f noise | 0.41 μV p-p (0.1–1 Hz) - avoids baseline wander in slow-moving biomedical or environmental sensor outputs. |
| Overload recovery time | 50 μs - recovers cleanly after input overvoltage events without latch-up, supporting robust front-end protection. |
| Extended temperature grade | Specified from −40°C to +125°C - qualified for under-hood automotive and industrial control applications. |
Applications
| Temperature Sensors | Strain Gage Amplifiers |
|---|---|
|
Use Scenario: Amplifying low-level output (10–100 μV/°C) from platinum RTDs or thermistors in HVAC controllers. IC Role / Device Role / Timing Role: Precision dc-coupled instrumentation amplifier front-end with gain ≥1000 and offset cancellation. Use Value: 1 μV offset and 0.005 μV/°C drift enable ±0.1°C accuracy over full industrial temperature range without calibration. |
Use Scenario: Conditioning mV-level bridge outputs from metal foil or semiconductor strain gages in load cells. IC Role / Device Role / Timing Role: Quad-channel differential amplifier with matched gain paths for multi-axis force measurement. Use Value: Channel-to-channel offset matching <5 μV and rail-to-rail output drive 16-bit ADCs directly at 3.3 V. |
| Medical Instrumentation | Thermocouple Amplifiers |
|
Use Scenario: Biopotential signal acquisition (ECG, EEG) requiring ultra-low noise and zero drift over long monitoring periods. IC Role / Device Role / Timing Role: First-stage amplifier with high CMRR and low input bias current to preserve signal integrity. Use Value: 10 pA typical input bias current prevents electrode polarization errors; 140 dB CMRR rejects 50/60 Hz mains interference. |
Use Scenario: Cold-junction compensation and amplification of Type K/J thermocouple outputs (≈40 μV/°C). IC Role / Device Role / Timing Role: Precision cold-junction sensor amplifier + thermocouple signal conditioner in single package. Use Value: Four independent channels allow simultaneous monitoring of multiple thermocouples with shared reference compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2189IDR | 2 μV offset, 0.005 μV/°C drift, 5.7 MHz GBW, higher supply current (1.3 mA/ch) | Better bandwidth for fast settling; less suitable for ultra-low-power battery operation | Select when >1 MHz bandwidth needed and power budget allows +73% current increase per channel |
| LTC2057HMS8#PBF | 0.5 μV offset, 0.015 μV/°C drift, 2 MHz GBW, SO-8 package only | Lower offset but higher drift; no quad option - requires two ICs for four channels | Select when absolute lowest initial offset is critical and board space permits dual SO-8 placement |
Compared with OPA2189IDR and LTC2057HMS8#PBF, AD8574ARU uniquely balances quad-channel integration, 1 μV offset, 0.005 μV/°C drift, and 750 μA/channel supply current in a compact TSSOP-14 - making it optimal for space-constrained, multi-sensor industrial modules requiring long-term dc stability.
Availability
AD8574ARU is available at Aetrix Electronics and suitable for precision sensor front-ends, medical diagnostic equipment, and automotive cabin temperature monitoring requiring stable component supply across extended temperature ranges.
Supply support for AD8574ARU 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 AD857x family was designed specifically for high-accuracy, low-drift, single-supply sensor signal conditioning - targeting applications where chopper-stabilized performance was previously cost-prohibitive.
FAQ
What is the maximum operating supply voltage for AD8574ARU?
The AD8574ARU has an absolute maximum supply voltage rating of 6 V. Operation is specified from 2.7 V to 5 V; exceeding 5 V may degrade long-term reliability and is not guaranteed per datasheet specifications. Always observe the 6 V absolute max limit to prevent permanent damage to the AD8574ARU.
Does AD8574ARU require external capacitors for auto-zero operation?
No, the AD8574ARU integrates all necessary auto-zero timing and storage capacitance internally. The datasheet explicitly states "No external capacitors required," eliminating layout sensitivity and reducing bill-of-materials cost. This distinguishes AD8574ARU from older auto-zero amplifiers needing external components.
Is AD8574ARU pin-compatible with other quad op amps like LM324 or TLV2464?
No, AD8574ARU is not pin-compatible with LM324 or TLV2464. Its 14-pin TSSOP pinout (including dedicated V+ and V− pins per quad) differs fundamentally from the 14-pin SOIC layouts of those legacy parts. Layout redesign is required when substituting AD8574ARU into existing LM324-based circuits.
What is the overload recovery time specification for AD8574ARU?
The AD8574ARU specifies an overload recovery time of 50 μs typical. This value is measured from output saturation to 90% recovery under defined test conditions (RL = 10 kΩ, VS = 5 V). It reflects the speed at which the internal auto-zero correction loop re-establishes accurate output after input overdrive - critical for transient-heavy sensor environments.
Can AD8574ARU operate from a 3.3 V supply in rail-to-rail mode?
Yes, AD8574ARU is fully specified for 2.7 V to 5 V single-supply operation. At 3.3 V, it maintains rail-to-rail input (0–3.3 V) and output (≤15 mV low, ≥3.285 V high at 10 kΩ), 1 μV offset, and 0.005 μV/°C drift - making it ideal for interfacing with 3.3 V microcontrollers and ADCs without level-shifting.
AD8574ARU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 1.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 nA
- Voltage - Input Offset:
- 1 µV
- Current - Supply:
- 850µA (x4 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
AD8574ARU FAQ
1.How can I place an order for AD8574ARU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8574ARU 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 AD8574ARU reliable?
The price and inventory of AD8574ARU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8574ARU is usually 5 days.
3.What payment methods are accepted for AD8574ARU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8574ARU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8574ARU?
AD8574ARU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8574ARU 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 AD8574ARU?
For technical support, including AD8574ARU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8574ARU requirements.
6.How does Aetrix verify that AD8574ARU is sourced from the original manufacturer or authorized distributors?
All AD8574ARU 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 AD8574ARU meets industry standards.
7.What is the process for return or replacement of AD8574ARU?
All AD8574ARU units undergo pre-shipment inspection (PSI). If there is an issue with AD8574ARU, 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 AD8574ARU part is unused and in its original packaging.
Return procedure for AD8574ARU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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