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Analog Devices Inc. AD8475ACPZ-R7
- Part No.:
- AD8475ACPZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD8475ACPZ-R7.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:510
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Product details
Overview
AD8475ACPZ-R7 from Analog Devices is a precision, fully differential funnel amplifier with pin-selectable attenuation gains of 0.4 and 0.8, rail-to-rail output, VOCM-adjustable common-mode voltage, and robust ±15 V input overvoltage protection on +5 V supply. It drives 18-bit SAR ADCs up to 4 MSPS in industrial signal conditioning chains.
For engineers reviewing the AD8475ACPZ-R7 datasheet, AD8475ACPZ-R7 pinout, AD8475ACPZ-R7 application, or AD8475ACPZ-R7 equivalent, key selection criteria include gain accuracy (≤0.05%), output offset (≤500 µV), THD+N (−112 dB), noise density (10 nV/√Hz), and compatibility with low-voltage differential ADC inputs requiring precise level shifting and attenuation.
Technical Context
The AD8475ACPZ-R7 implements a voltage-feedback fully differential amplifier architecture with two independent feedback loops: one for differential gain control via laser-trimmed on-chip resistor networks (1 kΩ/2.5 kΩ for G = 0.4; 1 kΩ/1.25 kΩ for G = 0.8), and another for VOCM-regulated common-mode output control. Its internal summing nodes operate rail-to-rail, enabling accurate measurement of ±12.5 V single-ended inputs on a +5 V supply.
It delivers 50 V/µs slew rate, settles to 18-bit precision in 50 ns, and maintains ≥86 dB CMRR over −40°C to +85°C. The 16-lead 3 mm × 3 mm LFCSP package integrates an exposed paddle for thermal and grounding performance critical to high-precision analog signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Attenuation Gain | 0.4 or 0.8, set by dedicated input pins; enables direct interface to ±10 V industrial signals while matching low-voltage ADC input ranges. |
| Output Offset | ≤500 µV max (B grade); ensures ≤0.003% full-scale error when driving 18-bit converters with 2.5 V reference. |
| THD + N | −112 dB at 100 kHz; preserves dynamic range and SNR in high-resolution data acquisition systems. |
| Noise Density | 10 nV/√Hz at 1 kHz; contributes <0.5 LSB RMS noise to 18-bit conversion at 100 kHz bandwidth. |
| Slew Rate | 50 V/µs; supports full-scale step response within 50 ns for 4 MSPS sampling without settling error. |
| Supply Range | +3 V to +10 V single supply or ±1.5 V to ±5 V dual supply; allows flexible integration into mixed-voltage industrial platforms. |
| Input Overvoltage | ±15 V survivable on +5 V supply; eliminates need for external clamping in PLC analog input modules. |
Pinout & Package
The AD8475ACPZ-R7 is housed in a 16-lead 3 mm × 3 mm LFCSP package with exposed thermal pad (EPAD) that must be soldered to ground. Pin count and layout are optimized for minimal parasitic coupling in high-speed differential signal paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN 0.4x (Pins 1, 4, 16) | Positive input for 0.4× attenuation path | Connects to signal source when G = 0.4; three parallel pins reduce trace inductance and improve high-frequency balance. |
| −IN 0.4x (Pins 5, 4) | Negative input for 0.4× attenuation path | Used with +IN 0.4x; pin duplication enhances symmetry and minimizes gain error from PCB routing asymmetry. |
| +IN 0.8x / −IN 0.8x (Pins 2, 3, 10, 9) | Inputs for 0.8× attenuation path | Selectively activated for higher gain; pin redundancy maintains matched impedance across both gain modes. |
| +OUT / −OUT (Pins 10, 11) | Differential output terminals | Drive ADC differential inputs directly; low 0.1 Ω output impedance ensures stable interface with switched-capacitor front-ends. |
| VOCM (Pin 9) | Output common-mode voltage control | Accepts DC voltage (−VS +1 V to +VS) to set output center point; enables precise alignment with ADC input range (e.g., 0.5 V to 4.5 V). |
| +VS (Pins 6, 7, 8) | Positive supply connection | Three parallel pins lower effective supply impedance and reduce PSRR degradation at high frequencies. |
| −VS (Pins 13, 14, 15) | Negative supply connection | Three parallel pins ensure symmetrical return path for differential operation and minimize ground bounce. |
| NC (Pin 12) | No-connect terminal | Internally unconnected; must remain floating to avoid parasitic coupling or thermal stress on die. |
Key Features
| Feature | Design Value |
|---|---|
| Precision laser-trimmed resistor network | Guarantees ≤0.05% gain error and ≥86 dB CMRR without external calibration or trimming components. |
| Rail-to-rail output stage | Swings within 50 mV of supply rails on +5 V, maximizing usable dynamic range for 18-bit ADCs with 2.5 V reference. |
| VOCM-controlled common-mode level shifting | Enables output centering at any voltage between −VS +1 V and +VS, eliminating need for external level-shifting circuitry. |
| Integrated ±15 V overvoltage protection | Withstands transient surges beyond supply rails without latch-up or parameter shift, reducing system-level protection component count. |
| Low 3.2 mA quiescent current | Supports power-constrained applications such as portable instrumentation and battery-backed data loggers. |
Applications
| Industrial PLC Analog Input Module | High-Accuracy Data Acquisition System |
|---|---|
Use Scenario: Conditioning ±10 V sensor outputs (e.g., strain gauges, RTDs) before digitization in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Precision attenuation, common-mode level shifting, and differential conversion to match 18-bit SAR ADC input range and maximize SNR. Use Value: Eliminates discrete resistor networks and op-amp stages, reducing BOM count by 4–6 components while maintaining ≤0.005% total gain error over temperature. | Use Scenario: Front-end signal conditioning for benchtop multimeters and automated test equipment requiring 100+ dB SFDR. IC Role / Device Role / Timing Role: Driving Σ-Δ or SAR ADCs with minimal distortion and noise contribution at 100 kHz–1 MHz bandwidth. Use Value: −112 dB THD+N and 10 nV/√Hz noise enable >102 dB ENOB at 100 kHz, exceeding Class I metrology requirements. |
| Single-Ended Sensor Interface for IoT Edge Node | Isolated Industrial Signal Chain |
Use Scenario: Converting single-ended 4–20 mA loop-powered sensor outputs to differential format for isolated ADCs in smart factory sensors. IC Role / Device Role / Timing Role: Single-ended-to-differential conversion with adjustable VOCM to interface with isolated ADC's input common-mode range. Use Value: VOCM pin allows direct alignment to isolated side's mid-supply (e.g., 1.65 V), avoiding level-shifter ICs and reducing isolation barrier complexity. | Use Scenario: Signal conditioning upstream of digital isolators in motor drive current sensing, where ±10 V shunt voltages must be attenuated and converted. IC Role / Device Role / Timing Role: Attenuating high-voltage differential shunt measurements while providing overvoltage protection against IGBT switching transients. Use Value: ±15 V input tolerance prevents damage during 600 V bus switching events, enabling direct connection to shunt without external TVS diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential funnel amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8476ARMZ | Fixed G = 0.4 only; MSOP-10 package; 2.5 mA supply current; same VOCM, noise, and THD+N specs. | Lacks pin-selectable 0.8× gain; smaller footprint but no exposed thermal pad; lower thermal performance in continuous high-output-current operation. | Choose AD8476ARMZ when fixed 0.4× attenuation suffices and board space is constrained; verify thermal margin under 4 MSPS sustained load. |
| ADA4941-1YCPZ-R7 | Unity-gain configurable differential amplifier; no integrated attenuation; 12.5 nV/√Hz noise; −105 dB THD+N; requires external gain-setting resistors. | Requires precision external resistors to achieve <0.1% gain error; lacks built-in overvoltage protection and VOCM self-bias capability. | Choose ADA4941-1YCPZ-R7 when variable gain >1× or ultra-low distortion (<−105 dB) at higher frequencies is required; accept added design complexity and calibration burden. |
Compared with AD8476ARMZ and ADA4941-1YCPZ-R7, the AD8475ACPZ-R7 uniquely combines selectable 0.4×/0.8× attenuation, integrated overvoltage protection, and VOCM-adjustable output common-mode in a thermally enhanced LFCSP-making it optimal for industrial ADC interfaces where signal integrity, robustness, and layout simplicity are prioritized.
Availability
AD8475ACPZ-R7 is available at Aetrix Electronics and suitable for industrial PLC analog input modules, high-accuracy data acquisition systems, and isolated motor current sensing applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD8475ACPZ-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, with R&D and manufacturing facilities worldwide.
The AD8475ACPZ-R7 belongs to Analog Devices' precision signal conditioning portfolio, designed specifically to simplify high-fidelity interface between industrial-level analog signals and modern low-voltage differential ADCs-reducing design cycle time and improving system-level accuracy.
FAQ
What gain options does the AD8475ACPZ-R7 support, and how are they selected?
The AD8475ACPZ-R7 supports two precision attenuation gains: 0.4 and 0.8. Selection is made by connecting the input signal to the corresponding dedicated input pins-+IN 0.4x/−IN 0.4x for G = 0.4, or +IN 0.8x/−IN 0.8x for G = 0.8. Unused input pins must be left unconnected or grounded per layout guidelines. The AD8475ACPZ-R7 does not support dynamic gain switching during operation; gain is fixed per configuration.
How does the VOCM pin function in the AD8475ACPZ-R7, and what voltage range is valid?
The VOCM pin on the AD8475ACPZ-R7 sets the output differential pair's common-mode voltage. When driven with a stable DC voltage between −VS + 1 V and +VS, the outputs center precisely at that voltage. If left unconnected, internal circuitry self-biases VOCM to midsupply (e.g., 2.5 V on +5 V supply). This feature enables seamless alignment with ADC input common-mode requirements without external resistive dividers. The AD8475ACPZ-R7 VOCM input impedance is 100 kΩ, allowing direct drive from low-power DACs or references.
What is the maximum input voltage the AD8475ACPZ-R7 can tolerate without damage?
The AD8475ACPZ-R7 withstands input voltages up to +VS + 10.5 V and down to −VS − 16 V without damage, per its Absolute Maximum Ratings. In practical operation on a +5 V supply, this translates to robust ±15 V overvoltage tolerance-sufficient for industrial transients and sensor fault conditions. This protection is implemented via integrated ESD diodes and does not require external clamping components, preserving signal integrity and simplifying front-end design for the AD8475ACPZ-R7.
Can the AD8475ACPZ-R7 drive a 1 MΩ differential ADC input directly?
Yes, the AD8475ACPZ-R7 can drive high-impedance differential loads including 1 MΩ ADC inputs. Its output impedance is 0.1 Ω, and it maintains specified gain accuracy, THD+N, and settling performance into loads ≥1 kΩ differentially. For 1 MΩ loads, output loading error is negligible (<0.001%), and no external buffering is needed. However, capacitive loading >30 pF per output may degrade stability and settling time, so keep PCB trace capacitance low when interfacing with high-Z ADCs using the AD8475ACPZ-R7.
Does the AD8475ACPZ-R7 require external compensation or filtering for stable operation?
No, the AD8475ACPZ-R7 is internally compensated and operates stably without external components across its full specified operating conditions. Its voltage-feedback architecture and optimized internal compensation ensure phase margin >60° into 1 kΩ || 30 pF loads. External RC filters may be added at the output for anti-aliasing, but are not required for stability. Layout best practices-such as short, symmetric traces to +OUT/−OUT and proper grounding of the EPAD-are essential to preserve the AD8475ACPZ-R7's specified noise and distortion performance.
AD8475ACPZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential, Rail-to-Rail
- Slew Rate:
- 50V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 150 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 3mA
- Current - Output / Channel:
- 110 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LFCSP-WQ (3x3)
AD8475ACPZ-R7 FAQ
1.How can I place an order for AD8475ACPZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8475ACPZ-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 AD8475ACPZ-R7 reliable?
The price and inventory of AD8475ACPZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8475ACPZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8475ACPZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8475ACPZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8475ACPZ-R7?
AD8475ACPZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8475ACPZ-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 AD8475ACPZ-R7?
For technical support, including AD8475ACPZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8475ACPZ-R7 requirements.
6.How does Aetrix verify that AD8475ACPZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8475ACPZ-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 AD8475ACPZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8475ACPZ-R7?
All AD8475ACPZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8475ACPZ-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 AD8475ACPZ-R7 part is unused and in its original packaging.
Return procedure for AD8475ACPZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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