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Analog Devices Inc. AD8574ARUZ
- Part No.:
- AD8574ARUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8574ARUZ.pdf
- Description:
- IC OPAMP ZER-DRIFT 4CIRC 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
AD8574ARUZ 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 offset voltage, 0.005 µV/°C drift, 145 dB open-loop gain, and 1.5 MHz gain bandwidth at 5 V supply - enabling high-accuracy amplification of low-level sensor signals such as thermocouple or strain gage outputs without calibration.
For engineers reviewing the AD8574ARUZ datasheet, AD8574ARUZ pinout, AD8574ARUZ application, or AD8574ARUZ equivalent, this page provides verified specifications, TSSOP-14 package layout, real-world use cases in medical instrumentation and industrial sensing, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The AD8574ARUZ employs a spread-spectrum auto-zero architecture with dual internal amplifiers: a main amplifier and a nulling amplifier that periodically samples and cancels its own input offset. 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, enabling full common-mode range (0 V to VS). The output stage uses common-source MOSFETs with short-circuit protection up to ±50 mA, delivering VOH = 4.99 V and VOL = 10 mV (RL = 100 kΩ) at 5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 1 µV typical - enables <10 µV total error in 100× gain circuits over temperature without trimming. |
| Offset Drift | 0.005 µV/°C - contributes <0.6 µV error across full −40°C to +125°C range, critical for uncalibrated sensors. |
| Supply Range | 2.7 V to 5.5 V single supply - supports battery-powered and industrial 3.3 V/5 V systems without dual rails. |
| Open-Loop Gain | 145 dB typical - ensures <0.001% gain error in precision instrumentation amplifier configurations. |
| CMRR / PSRR | 140 dB / 130 dB typical - rejects >100 dB of power supply ripple and common-mode interference in noisy environments. |
| Slew Rate | 0.4 V/µs at 5 V - sufficient for <10 kHz small-signal bandwidth in unity-gain stable configurations. |
| Quiescent Current | 750 µA per amplifier - allows four-channel precision amplification within 3 mA total budget for portable devices. |
Pinout & Package
AD8574ARUZ is packaged in a 14-lead TSSOP (RU suffix), 5.0 mm × 4.4 mm body, 0.65 mm pitch, exposed pad optional. Pin 1 is marked by a dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load or feedback network; rail-to-rail swing supports full-scale ADC interfacing. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node (10 pA bias current); requires matched trace routing for CMRR preservation. |
| 3 | +IN A | Noninverting input of Amp A - same impedance as –IN A; used for reference or sensor connection in differential setups. |
| 4 | V+ | Positive supply rail - decoupling capacitor (0.1 µF ceramic) required within 5 mm for stability and PSRR performance. |
| 5 | +IN B | Noninverting input of Amp B - independent channel; shares no internal nodes with Amp A for true quad isolation. |
| 6 | –IN B | Inverting input of Amp B - electrically isolated from other channels; supports separate feedback networks per amplifier. |
| 7 | OUT B | Amplifier B output - identical drive capability to OUT A; can sink/source ±30 mA under 10 kΩ load. |
| 8 | V– | Negative supply rail (GND in single-supply mode) - must be low-impedance; shared return path affects crosstalk below −80 dB. |
| 9 | OUT C | Amplifier C output - fully independent; layout symmetry recommended to minimize thermal gradient-induced offset drift. |
| 10 | –IN C | Inverting input of Amp C - same 10 pA bias current spec; sensitive to PCB contamination; guard ring recommended. |
| 11 | +IN C | Noninverting input of Amp C - matches +IN A/B in offset and drift; enables matched multi-channel sensor front ends. |
| 12 | +IN D | Noninverting input of Amp D - fourth channel input; no internal coupling to other inputs per datasheet Figure 5. |
| 13 | –IN D | Inverting input of Amp D - validated at 10 pA IB across −40°C to +125°C; suitable for high-Z pH or photodiode interfaces. |
| 14 | OUT D | Amplifier D output - completes quad functionality; all four outputs specified for simultaneous operation at full rail-to-rail swing. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitors required | Internal auto-zero capacitor eliminates need for external timing or correction components - reduces BOM count and board area. |
| Rail-to-rail input and output | Supports 0 V to VS common-mode range and <10 mV from rails - maximizes dynamic range when interfacing to 12–16-bit SAR ADCs. |
| Ultralow input bias current | 10 pA typical - prevents >1 mV error across 100 MΩ source impedances (e.g., piezoresistive pressure sensors). |
| Overload recovery time | 50 µs - enables fast settling after input overvoltage events (e.g., ESD transients on sensor lines) without latch-up. |
| Extended temperature range | −40°C to +125°C operation - qualified for automotive cabin and industrial motor control applications without derating. |
Applications
| Temperature Sensors | Pressure Sensors |
|---|---|
Use Scenario: Amplifying microvolt-level thermocouple outputs (e.g., Type K) across −40°C to +125°C ambient with <1°C accuracy. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with cold-junction compensation interface. Use Value: 1 µV offset and 0.005 µV/°C drift limit total error to <2.5 µV over full range - equivalent to <0.06°C thermocouple uncertainty. |
Use Scenario: Conditioning bridge outputs from MEMS pressure sensors in automotive manifold or medical ventilator systems. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail buffer and gain stage before 24-bit delta-sigma ADC. Use Value: 10 pA input bias current avoids >10 µV error across 1 GΩ bridge resistors; 140 dB CMRR rejects engine EMI. |
| Medical Instrumentation | Precision Current Sensing |
Use Scenario: Biopotential signal acquisition (ECG, EEG) requiring dc-coupled, low-drift amplification with >100 dB SNR. IC Role / Device Role / Timing Role: First-stage amplifier in analog front-end with active electrode biasing. Use Value: 51 nV/√Hz voltage noise at 1 kHz and 145 dB gain enable sub-µV resolution without chopper artifacts. |
Use Scenario: High-side current monitoring in 48 V battery management systems with 100 µΩ shunt resistors. IC Role / Device Role / Timing Role: Zero-drift difference amplifier with 100× gain for 10 mV/A sensitivity. Use Value: 1 µV offset translates to <10 mA measurement error at 100 A full scale - meets IEC 62368-1 accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2057HMS8#PBF | Lower offset (0.5 µV) but higher supply current (1.1 mA/amplifier); SO-8 package only. | Better dc precision but less suitable for quad-channel space-constrained designs. | Choose LTC2057HMS8#PBF when single-channel ultra-low offset dominates over channel count and quiescent power. |
| OPA2189IDR | Higher GBW (2 MHz), lower noise (4.2 nV/√Hz), but larger SOIC-8 footprint; not quad. | Superior ac performance for wideband sensor interfaces, but requires two ICs for quad function. | Choose OPA2189IDR when bandwidth >1 MHz or voltage noise <5 nV/√Hz is mandatory, and board area permits dual placement. |
Compared with AD8574ARUZ, LTC2057HMS8#PBF offers superior offset but lacks quad integration and consumes 47% more current per channel, while OPA2189IDR delivers higher speed and lower noise but doubles component count and PCB footprint for equivalent channel density.
Availability
AD8574ARUZ is available at Aetrix Electronics and suitable for medical instrumentation, industrial pressure sensing, and automotive temperature monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8574ARUZ 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 dc signal conditioning in single-supply industrial and automotive systems where auto-zero performance was previously cost-prohibitive.
FAQ
What is the maximum operating temperature range for the AD8574ARUZ?
The AD8574ARUZ is rated for continuous operation from −40°C to +125°C, fully specified across this extended industrial/automotive temperature range per datasheet Table 3 and General Description. All key parameters-including offset voltage, drift, CMRR, and supply current-are guaranteed over this range, making AD8574ARUZ suitable for under-hood automotive and industrial motor control applications without derating.
Does the AD8574ARUZ require external capacitors for auto-zero operation?
No, the AD8574ARUZ does not require external capacitors for auto-zero operation. Its spread-spectrum auto-zero architecture integrates all necessary correction capacitance internally, as confirmed in the Features section and Functional Description. This eliminates external timing components, reduces PCB area, and avoids capacitor-related drift or aging effects-key advantages over discrete chopper-stabilized solutions.
Can the AD8574ARUZ drive a 10 kΩ load rail-to-rail at 5 V supply?
Yes, the AD8574ARUZ can drive a 10 kΩ load rail-to-rail at 5 V supply: VOH = 4.95 V (min) and VOL = 10 mV (max) per Table 1, meaning it achieves <50 mV from each rail. This meets true rail-to-rail output specification for precision ADC interfacing and low-headroom systems, and is validated across −40°C to +125°C per datasheet electrical characteristics.
How does the AD8574ARUZ handle input overvoltage conditions?
The AD8574ARUZ includes input overvoltage protection with absolute maximum ratings of GND − 0.3 V to VS + 0.3 V per Table 3. Exceeding these limits risks permanent damage. For transient overvoltage (e.g., ESD), the device recovers in 50 µs (typical overload recovery time) without latch-up, as verified in Figure 29–30 and Functional Description - critical for robust sensor front-end design.
Is the AD8574ARUZ pin-compatible with other quad op amps in TSSOP-14 packages?
No, the AD8574ARUZ has a unique pinout specific to its quad zero-drift architecture, as shown in Figure 5 of the datasheet. It is not pin-compatible with generic quad op amps (e.g., LM324, TL074) or other precision quads like the OPA4189. Layout must follow AD8574ARUZ's exact pin mapping - particularly V+ (Pin 4), V– (Pin 8), and channel interleaving - to ensure correct operation and avoid cross-channel coupling.
AD8574ARUZ 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:
- 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
AD8574ARUZ FAQ
1.How can I place an order for AD8574ARUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8574ARUZ 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 AD8574ARUZ reliable?
The price and inventory of AD8574ARUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8574ARUZ is usually 5 days.
3.What payment methods are accepted for AD8574ARUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8574ARUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8574ARUZ?
AD8574ARUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8574ARUZ 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 AD8574ARUZ?
For technical support, including AD8574ARUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8574ARUZ requirements.
6.How does Aetrix verify that AD8574ARUZ is sourced from the original manufacturer or authorized distributors?
All AD8574ARUZ 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 AD8574ARUZ meets industry standards.
7.What is the process for return or replacement of AD8574ARUZ?
All AD8574ARUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8574ARUZ, 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 AD8574ARUZ part is unused and in its original packaging.
Return procedure for AD8574ARUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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