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Analog Devices Inc. AD8548ARZ
- Part No.:
- AD8548ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8548ARZ.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:333
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Product details
Overview
AD8548ARZ from Analog Devices is a quad rail-to-rail input/output (RRIO), micropower CMOS operational amplifier optimized for low-power, wide-supply-voltage sensor signal conditioning. It delivers 22 μA supply current per amplifier at 18 V, 20 pA max input bias current, and 240 kHz gain bandwidth product - enabling precision dc gain and buffering in battery-powered ECGs, remote sensors, and 4 mA to 20 mA loop drivers.
For engineers reviewing the AD8548ARZ datasheet, AD8548ARZ pinout, AD8548ARZ application, or AD8548ARZ equivalent, key selection considerations include its 14-lead SOIC_N package, −40°C to +125°C operating range, rail-to-rail output swing within 30 mV of rails at 18 V, and immunity to electromagnetic interference in noisy industrial environments.
Technical Context
The AD8548ARZ employs a dual-differential-pair input stage (NMOS + PMOS) to achieve rail-to-rail common-mode input range across 0 V to 18 V, with handoff behavior visible in offset voltage vs. common-mode voltage curves. Its output stage uses complementary MOSFETs to deliver rail-to-rail swing while maintaining stability into 100 kΩ loads.
It operates from single supplies (2.7 V to 18 V) or dual supplies (±1.35 V to ±9 V), features unity-gain stability, 60° phase margin, and exhibits consistent 105 dB channel separation at 10 kHz - critical for multi-channel sensor systems where crosstalk must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amp | 22 μA max at 18 V - enables >1-year operation on coin-cell batteries in portable medical monitors. |
| Input Bias Current | 20 pA max - preserves signal integrity in high-impedance transimpedance amplifiers and pH sensor interfaces. |
| Gain Bandwidth Product | 240 kHz typical at AV = 100 - supports stable closed-loop gain up to 100 for precision dc-coupled sensor front ends. |
| Rail-to-Rail Output Swing | Within 30 mV of V− and 20 mV of V+ at 18 V - maximizes dynamic range when driving 12-bit ADCs directly. |
| EMI Rejection Ratio | 90 dB at 400–2400 MHz - suppresses RF interference in wireless sensor nodes without external filtering. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial control applications. |
| Common-Mode Range | 0 V to 18 V - accepts inputs down to ground and up to supply rail, simplifying level-shifting in single-supply systems. |
Pinout & Package
The AD8548ARZ is housed in a 14-lead SOIC_N (Small Outline Integrated Circuit, narrow-body) package with standard 1.27 mm pitch, compatible with automated PCB assembly and IPC-7351B footprint IPC7351SOIC14N.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives load directly; rail-to-rail swing supports full-scale ADC interfacing. |
| 2 | −IN A | Inverting input of Amp A - high-impedance node; sensitive to layout-induced leakage and noise. |
| 3 | +IN A | Non-inverting input of Amp A - matched to −IN A for optimal CMRR; requires symmetric trace routing. |
| 4 | V+ | Positive supply rail - decoupling capacitor (0.1 μF ceramic) required within 5 mm for stability. |
| 5 | +IN B | Non-inverting input of Amp B - electrically isolated from Amp A; shares no internal substrate coupling. |
| 6 | −IN B | Inverting input of Amp B - independent bias current path; enables true differential pair configuration. |
| 7 | OUT B | Amplifier B output - fully independent; supports simultaneous dual-sensor conditioning. |
| 8 | OUT C | Amplifier C output - identical performance to OUT A/B; enables 3-channel analog front end in one IC. |
| 9 | −IN C | Inverting input of Amp C - matched input capacitance (3.5 pF common-mode) ensures consistent frequency response. |
| 10 | +IN C | Non-inverting input of Amp C - same input resistance (10 GΩ) as other channels for uniform sensor interface. |
| 11 | V− | Negative supply rail - connects to ground in single-supply mode; must be low-impedance return path. |
| 12 | +IN D | Non-inverting input of Amp D - fourth independent channel; supports quad transimpedance or buffer configuration. |
| 13 | −IN D | Inverting input of Amp D - supports active filter topologies requiring matched input impedance. |
| 14 | OUT D | Amplifier D output - completes quad functionality; enables full 4-channel signal chain integration. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation at 18 V | 22 μA per amplifier enables ultra-low-quiescent-current designs for energy-harvesting and backup-battery systems. |
| Rail-to-rail input and output | Full 0 V to 18 V input range and output swing within 30 mV of rails preserves signal fidelity in single-supply data acquisition. |
| High EMI immunity | 90 dB rejection at cellular and Wi-Fi frequencies eliminates need for external RF filters in connected medical devices. |
| Low input bias current | 20 pA maximum ensures minimal error in high-Z sensor interfaces like piezoelectric accelerometers and photodiode TIA circuits. |
| Extended temperature range | −40°C to +125°C operation supports deployment in automotive engine control units and industrial motor drives. |
Applications
| Portable Medical Equipment | Remote Sensors |
|---|---|
Use Scenario: Signal conditioning for ECG electrode inputs in handheld patient monitors. IC Role / Device Role / Timing Role: Quad amplifier provides simultaneous dc-coupled gain, baseline correction, and right-leg drive buffering. Use Value: 22 μA per amp extends battery life beyond 18 months; rail-to-rail output drives 12-bit SAR ADCs without level-shifting circuitry. | Use Scenario: Low-power signal amplification in battery-operated soil moisture and temperature nodes. IC Role / Device Role / Timing Role: Transimpedance amplifier for resistive humidity sensors and voltage follower for thermistor bridges. Use Value: 20 pA input bias current prevents drift in high-impedance sensor outputs; 18 V max supply accommodates solar-charged LiFePO₄ stacks. |
| Transimpedance Amplifiers | 4 mA to 20 mA Loop Drivers |
Use Scenario: Photodiode current-to-voltage conversion in optical smoke detectors. IC Role / Device Role / Timing Role: Precision TIA with feedback resistor ≥10 MΩ and low-noise density (50 nV/√Hz). Use Value: 10 GΩ input resistance minimizes loading error; 0.1 Hz–10 Hz noise of 5 µV p-p ensures stable dc output for analog smoke threshold detection. | Use Scenario: Voltage-to-current conversion and loop regulation in industrial process controllers. IC Role / Device Role / Timing Role: Output amplifier in 4–20 mA transmitter with HART modulation capability. Use Value: Rail-to-rail output swing ensures full 20 mA compliance over 0–24 V loop supply; 110 dB large-signal gain maintains accuracy across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8544ARZ | Same quad RRIO architecture but rated for 12 V max supply; 44 μA supply current per amp at 5 V. | Lower voltage ceiling limits use in 18 V industrial loops or high-voltage sensor biasing. | Select AD8544ARZ only if system supply is ≤12 V and higher quiescent current is acceptable. |
| OP481ARZ | Quad micropower op amp with 25 μA supply current; no rail-to-rail input - common-mode range limited to V− + 1.2 V to V+ − 1.2 V. | Cannot interface directly with ground-referenced sensors or rail-swinging DACs without level shifters. | Choose OP481ARZ when EMI immunity and ultra-low bias current are prioritized over rail-to-rail input capability. |
Compared with AD8544ARZ and OP481ARZ, the AD8548ARZ uniquely combines 18 V operation, true rail-to-rail input, and sub-25 μA quiescent current - making it the only option among the three suitable for 4–20 mA transmitters powered from 24 V supplies with ground-referenced sensor inputs.
Availability
AD8548ARZ is available at Aetrix Electronics and suitable for portable medical equipment, remote environmental sensors, and industrial 4 mA to 20 mA process control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8548ARZ 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 Wilmington, MA.
The AD8548 belongs to Analog Devices' micropower precision op amp product line, engineered specifically for battery-constrained, wide-supply-voltage applications including medical diagnostics, industrial sensing, and process automation.
FAQ
What is the maximum supply voltage rating for the AD8548ARZ?
The AD8548ARZ has an absolute maximum supply voltage rating of 20.5 V, with recommended operating range from 2.7 V to 18 V. Exceeding 18 V during normal operation risks exceeding thermal limits and degrading long-term reliability, even though the device may function temporarily. Always observe the 18 V maximum operating voltage specified in the datasheet for sustained performance.
Does the AD8548ARZ support true rail-to-rail input operation?
Yes, the AD8548ARZ supports true rail-to-rail input operation across the full 0 V to 18 V common-mode range when powered from a 18 V supply. This is achieved via its dual-differential-pair input stage (NMOS + PMOS), allowing direct interfacing with ground-referenced sensors and rail-swinging DAC outputs without external level-shifting circuitry.
What is the typical input bias current of the AD8548ARZ at room temperature?
The typical input bias current of the AD8548ARZ is 1 pA at 25°C and 2.7 V supply, with a maximum specification of 20 pA across the full −40°C to +125°C temperature range and 2.7 V to 18 V supply range. This ultra-low bias current makes the AD8548ARZ ideal for high-impedance sensor interfaces such as photodiode transimpedance amplifiers and pH electrode buffers.
Can the AD8548ARZ drive capacitive loads without instability?
The AD8548ARZ is unity-gain stable and characterized for capacitive loads up to 100 pF with 1 MΩ load resistance, showing 60° phase margin. For loads >100 pF, external isolation resistance (e.g., 100 Ω in series with the output) is recommended to maintain stability. The datasheet provides detailed overshoot vs. capacitance plots (Figures 35 and 38) confirming robust small-signal transient response up to 1 nF with proper compensation.
Is the AD8548ARZ pin-compatible with other quad op amps in SOIC-14 packages?
No, the AD8548ARZ is not pin-compatible with generic quad op amps such as LM324 or TLV2464 due to its unique pinout: V+ is on Pin 4 and V− on Pin 11, whereas most legacy quad op amps place both supplies on Pins 4 and 11 in opposite polarity. Substituting without PCB revision will cause immediate functional failure and potential damage. Always verify pin mapping before replacement.
AD8548ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.08V/µs
- Gain Bandwidth Product:
- 200 kHz
- -3db Bandwidth:
- 310 kHz
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 18µA (x4 Channels)
- Current - Output / Channel:
- 12 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 18 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
AD8548ARZ FAQ
1.How can I place an order for AD8548ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8548ARZ 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 AD8548ARZ reliable?
The price and inventory of AD8548ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8548ARZ is usually 5 days.
3.What payment methods are accepted for AD8548ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8548ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8548ARZ?
AD8548ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8548ARZ 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 AD8548ARZ?
For technical support, including AD8548ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8548ARZ requirements.
6.How does Aetrix verify that AD8548ARZ is sourced from the original manufacturer or authorized distributors?
All AD8548ARZ 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 AD8548ARZ meets industry standards.
7.What is the process for return or replacement of AD8548ARZ?
All AD8548ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8548ARZ, 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 AD8548ARZ part is unused and in its original packaging.
Return procedure for AD8548ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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