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Analog Devices Inc. AD8505ACBZ-R7
- Part No.:
- AD8505ACBZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
AD8505ACBZ-R7.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,059
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Product details
Overview
AD8505ACBZ-R7 from Analog Devices is a single-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, 45 nV/√Hz voltage noise at 1 kHz, 2.5 mV max offset voltage, and operates from 1.8 V to 5 V single supply - enabling high-accuracy signal conditioning in pressure sensors, IR thermometers, and hazard detectors.
For engineers reviewing the AD8505ACBZ-R7 datasheet, AD8505ACBZ-R7 pinout, AD8505ACBZ-R7 application, or AD8505ACBZ-R7 equivalent, key selection criteria include its zero-input-crossover distortion architecture, 105 dB typical CMRR, 100 dB minimum PSRR, and guaranteed operation across −40°C to +125°C industrial temperature range - critical for long-life, low-voltage embedded sensor nodes.
Technical Context
The AD8505ACBZ-R7 employs an on-chip charge pump to power its input differential pair, eliminating crossover distortion inherent in dual-pair rail-to-rail input stages while maintaining full common-mode range (0 V to VSY). This architecture enables stable CMRR >100 dB and PSRR ≥100 dB across supply voltages from 1.8 V to 5 V.
It features unity-gain stability with 95 kHz gain-bandwidth product, 13 mV/µs slew rate, and 60° phase margin into 1 MΩ//20 pF loads. Input bias current remains ≤10 pA (typ) and ≤600 pA (max over −40°C to +125°C), supporting high-impedance sensor interfaces without significant error sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 24 µA max per amplifier at 1.8 V (−40°C to +125°C); enables >10-year battery life in coin-cell–powered devices. |
| Input Offset Voltage | 2.5 mV max at 25°C; ensures <±0.5% measurement error in 12-bit ADC front-ends with 3.3 V reference. |
| CMRR / PSRR | 105 dB typical CMRR, 100 dB min PSRR; rejects supply ripple and common-mode interference in noisy industrial environments. |
| Voltage Noise Density | 45 nV/√Hz at 1 kHz; supports sub-µV-level signal amplification in bio-sensor and precision transducer applications. |
| Input Bias Current | 1 pA typical; preserves signal integrity when interfacing with >1 GΩ source impedances (e.g., piezoresistive bridges). |
| Rail-to-Rail I/O | Input range: 0 V to VSY; output swing: within 5 mV of rails at 100 kΩ load; maximizes dynamic range in low-voltage systems. |
| Operating Temperature | −40°C to +125°C extended industrial range; qualified for under-hood automotive sensors and industrial fire detectors. |
Pinout & Package
AD8505ACBZ-R7 is packaged in a 6-ball WLCSP (CB-6-7) measuring 1.0 mm × 1.0 mm × 0.55 mm, optimized for space-constrained portable and wearable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Ball A1 | Output (OUT) | Amplified signal output; capable of sourcing/sinking ±4.5 mA; rail-to-rail swing minimizes headroom loss. |
| Ball A2 | Inverting Input (−IN) | Differential input node; 220 GΩ input resistance and 1 pA bias current enable high-Z sensor interface. |
| Ball B1 | Non-Inverting Input (+IN) | Differential input node; matched to −IN for minimal input offset drift over temperature and common-mode range. |
| Ball B2 | Positive Supply (V+) | Primary power connection; accepts 1.8 V to 5 V single supply; PSRR ≥100 dB suppresses supply noise coupling. |
| Ball C1 | Negative Supply (V−) | Ground reference terminal; must be connected to system GND; internal ESD protection rated to ±2 kV HBM. |
| Ball C2 | No Connect (NC) | Unbonded pad; left floating per datasheet; no electrical function or thermal role; must not be soldered or tied. |
Key Features
| Feature | Design Value |
|---|---|
| Zero Input Crossover Distortion | On-chip charge pump eliminates switching artifacts in rail-to-rail input stage, preserving THD <−100 dB across full common-mode range. |
| Ultra-Low Power Operation | 20 µA max supply current enables continuous monitoring in energy-harvesting and coin-cell–powered IoT endpoints. |
| High DC Precision | 2.5 mV max VOS, 2.5 µV/°C max drift, and 105 dB CMRR ensure stable offset performance over battery discharge and temperature cycling. |
| Wide Supply Range | 1.8 V to 5 V single-supply operation supports direct interface with Li-ion, alkaline, and regulated 3.3 V domains without level-shifting. |
| Robust Input Protection | Clamp diodes on inputs limit input current to ≤10 mA if signal exceeds rails by >0.5 V - simplifies external protection design. |
Applications
| Pressure and Position Sensors | Bio Sensors |
|---|---|
|
Use Scenario: Amplifying mV-level bridge outputs from MEMS pressure sensors in portable medical inhalers and industrial flow meters. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with rail-to-rail input to capture full bridge swing across 1.8–3.6 V battery range. Use Value: 100 dB PSRR prevents battery voltage sag from inducing offset drift; 1 pA bias current avoids loading high-impedance Wheatstone bridges. |
Use Scenario: Signal conditioning for electrochemical glucose strips and ECG electrodes in handheld patient monitors. IC Role / Device Role / Timing Role: Low-noise, low-drift transimpedance and buffer stage for microamp-level biopotential currents. Use Value: 45 nV/√Hz noise density and 2.8 µVp-p (0.1–10 Hz) enable accurate detection of sub-µV physiological signals. |
| IR Thermometers | Hazard Detectors |
|
Use Scenario: Amplifying thermopile output in non-contact temperature sensors used in smart HVAC and fever-screening terminals. IC Role / Device Role / Timing Role: DC-coupled, low-drift amplifier with 2.5 mV max VOS to resolve <0.1°C resolution over 0–100°C range. Use Value: 2.5 µV/°C max offset drift ensures calibration remains valid across full operating temperature range (−40°C to +125°C). |
Use Scenario: Signal conditioning in smoke, CO, and gas detectors powered by AA batteries with 10+ year shelf life. IC Role / Device Role / Timing Role: Ultra-low-power analog front-end for electrochemical and NDIR sensor elements requiring continuous wake-up capability. Use Value: 20 µA max supply current extends battery life beyond 5 years in always-on detection mode; 105 dB CMRR rejects EMI from alarm sirens and switching regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision, low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4505-1ACBZ-R7 | Same zero-crossover architecture; 15 µA typ supply current; 1.5 mV max VOS; identical 6-ball WLCSP package. | Lower offset and bias current suit higher-precision biosensing; slightly reduced PSRR (95 dB min) limits use in high-ripple environments. | Select ADA4505-1ACBZ-R7 when <1.5 mV offset and <0.5 pA bias current are required; verify PSRR margin for target supply noise profile. |
| OPA316IDBVR | CMOS rail-to-rail op amp; 100 µA supply current; 0.5 mV max VOS; SOT-23-5 package; no charge pump - exhibits measurable crossover distortion. | Higher speed (10 MHz GBW) suits active filtering; unsuitable for precision DC measurements near supply rails due to distortion. | Choose OPA316IDBVR only for AC-coupled, bandwidth-critical applications where ultra-low power is secondary; avoid for battery-voltage–tracking DC sensors. |
Compared with ADA4505-1ACBZ-R7 and OPA316IDBVR, AD8505ACBZ-R7 uniquely balances ultra-low quiescent current (24 µA max), zero-crossover linearity, and 100 dB PSRR - making it optimal for long-life, high-accuracy DC sensor nodes where supply voltage varies and rail-to-rail fidelity is mandatory.
Availability
AD8505ACBZ-R7 is available at Aetrix Electronics and suitable for pressure sensors, IR thermometers, bio-sensors, and hazard detectors requiring stable component supply across extended temperature and multi-year production cycles.
Supply support for AD8505ACBZ-R7 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 AD8505ACBZ-R7 belongs to Analog Devices' zero-crossover distortion op amp family, designed specifically for ultra-low-power, high-precision signal conditioning in battery-constrained industrial and medical sensing applications.
FAQ
What is the maximum supply current specification for AD8505ACBZ-R7 over temperature?
The AD8505ACBZ-R7 has a maximum supply current of 27.5 µA over the full −40°C to +125°C operating range, measured at 1.8 V supply. At 25°C and 1.8 V, typical current is 16.5 µA. This ultra-low quiescent draw makes AD8505ACBZ-R7 ideal for multi-year battery operation in remote sensor nodes where power budget is tightly constrained.
Does AD8505ACBZ-R7 support true rail-to-rail input and output operation?
Yes, AD8505ACBZ-R7 supports true rail-to-rail input (0 V to VSY) and output (within 5 mV of rails at 100 kΩ load). Its proprietary charge pump input stage eliminates crossover distortion - unlike conventional dual-pair architectures - ensuring linear response across the entire common-mode range. This behavior is verified in Figure 46 of the AD8505/AD8506/AD8508 Rev. F datasheet.
What is the operating temperature range qualified for AD8505ACBZ-R7?
AD8505ACBZ-R7 is fully specified and qualified for operation from −40°C to +125°C, covering extended industrial and under-hood automotive environments. All key parameters - including offset voltage, PSRR, CMRR, and supply current - are guaranteed across this range per Tables 1 and 2 in the Rev. F datasheet.
Can AD8505ACBZ-R7 drive capacitive loads without instability?
AD8505ACBZ-R7 is unity-gain stable and characterized for capacitive loads up to 200 pF with 100 kΩ series resistance (Figure 37–38). For loads >100 pF, a small series resistor (10–100 Ω) at the output is recommended to maintain 60° phase margin. The device's 95 kHz GBW and 13 mV/µs slew rate inherently limit ringing in typical sensor interface configurations.
What package type is used for AD8505ACBZ-R7, and what are its key mechanical dimensions?
AD8505ACBZ-R7 uses a 6-ball WLCSP (Wafer-Level Chip Scale Package), designated CB-6-7, with footprint 1.0 mm × 1.0 mm and height 0.55 mm. Ball pitch is 0.4 mm; balls are arranged in 2×3 array with A1 as OUT and C2 as NC. This ultra-compact package enables miniaturized designs in wearables and portable diagnostics where board area is at a premium.
AD8505ACBZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- 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:
- 6-WLCSP (0.91x1.39)
AD8505ACBZ-R7 FAQ
1.How can I place an order for AD8505ACBZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8505ACBZ-R7 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 AD8505ACBZ-R7 reliable?
The price and inventory of AD8505ACBZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8505ACBZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8505ACBZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8505ACBZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8505ACBZ-R7?
AD8505ACBZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8505ACBZ-R7 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 AD8505ACBZ-R7?
For technical support, including AD8505ACBZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8505ACBZ-R7 requirements.
6.How does Aetrix verify that AD8505ACBZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8505ACBZ-R7 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 AD8505ACBZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8505ACBZ-R7?
All AD8505ACBZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8505ACBZ-R7, 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 AD8505ACBZ-R7 part is unused and in its original packaging.
Return procedure for AD8505ACBZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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