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Analog Devices Inc. AD8475BRMZ
- Part No.:
- AD8475BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8475BRMZ.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,553
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Product details
Overview
AD8475BRMZ from Analog Devices is a precision, fully differential funnel amplifier with selectable attenuation gains of 0.4 and 0.8, rail-to-rail output, VOCM-adjustable common-mode level, and robust ±15 V input overvoltage protection on +5 V supply. It drives high-precision ADCs including 18-bit SAR converters at up to 4 MSPS in industrial signal conditioning chains.
For engineers reviewing the AD8475BRMZ datasheet, AD8475BRMZ pinout, AD8475BRMZ application, or AD8475BRMZ equivalent, key selection criteria include gain selectability (0.4/0.8), 500 µV max output offset, 10 nV/√Hz output noise, −112 dB THD+N, and compatibility with low-voltage differential-input ADC front-ends requiring precise level shifting and attenuation.
Technical Context
The AD8475BRMZ implements a voltage-feedback fully differential amplifier architecture with two independent feedback loops: one for differential gain control via laser-trimmed on-chip resistors (1 kΩ/1.25 kΩ networks), and another for VOCM-controlled common-mode regulation. Its internal summing nodes operate rail-to-rail, enabling accurate processing of ±12.5 V single-ended inputs on a +5 V supply.
Gain selection is hardwired per input pin pairing (+IN/−IN for 0.4× or 0.8×), not dynamically configurable. Input overvoltage protection relies on integrated ESD diodes rated to +VS + 10.5 V and −VS − 16 V, while output balance error remains ≤−90 dB across 1 MHz due to matched internal resistor ratios and symmetric topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Attenuation Gains | 0.4 and 0.8 - fixed, pin-selectable options; no external resistors needed for precision scaling. |
| Output Offset | ≤500 µV - enables direct interface to 18-bit ADCs without trimming circuitry. |
| Output Noise Density | 10 nV/√Hz - supports high dynamic range in precision data acquisition systems. |
| THD + N | −112 dB - ensures minimal distortion when driving high-resolution Σ-Δ or SAR ADCs. |
| Slew Rate | 50 V/µs - settles to 18-bit precision within 50 ns for 2 V step, matching 4 MSPS ADC acquisition. |
| Input Overvoltage Protection | ±15 V on +5 V supply - protects against industrial transients without external clamping. |
| Supply Range | +3 V to +10 V single supply or ±1.5 V to ±5 V dual supply - supports flexible system-level power architecture. |
Pinout & Package
The AD8475BRMZ is packaged in a 10-lead MSOP (3 mm × 3 mm) with exposed pad. Pin 1 is −IN 0.8x; pin 2 is −IN 0.4x; pin 3 is +VS; pin 4 is VOCM; pin 5 is +OUT; pin 6 is −OUT; pin 7 is NC; pin 8 is −VS; pin 9 is +IN 0.4x; pin 10 is +IN 0.8x. The exposed paddle must be soldered to ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN 0.8x) | Negative input for 0.8× attenuation path | Selects 0.8 gain when used with pin 10; defines differential input node for high-gain configuration. |
| 2 (−IN 0.4x) | Negative input for 0.4× attenuation path | Selects 0.4 gain when used with pin 9; enables wider input voltage range handling (±12.5 V SE). |
| 3 (+VS) | Positive supply connection | Accepts 3 V to 10 V single supply or +1.5 V to +5 V dual supply; three internal connections for low-impedance routing. |
| 4 (VOCM) | Output common-mode voltage control | Sets differential output midpoint; open-circuit defaults to midsupply; critical for ADC input range alignment. |
| 5 (+OUT) | Noninverting differential output | Delivers rail-to-rail output swing; paired with pin 6 to form true differential drive for ADC inputs. |
| 6 (−OUT) | Inverting differential output | Complements +OUT with precise amplitude/phase balance; output balance error ≤−90 dB up to 1 MHz. |
| 7 (NC) | No connect | Must remain unconnected; no internal function or bonding. |
| 8 (−VS) | Negative supply connection | Required for dual-supply operation (±1.5 V to ±5 V); tied to ground in single-supply configurations. |
| 9 (+IN 0.4x) | Positive input for 0.4× attenuation path | Used with pin 2 to configure 0.4 gain; supports largest input common-mode range (±12.5 V SE). |
| 10 (+IN 0.8x) | Positive input for 0.8× attenuation path | Used with pin 1 to configure 0.8 gain; optimized for higher signal fidelity at reduced attenuation. |
Key Features
| Feature | Design Value |
|---|---|
| Precision laser-trimmed resistor network | Guarantees ≤0.05% gain error and ≥86 dB CMRR without external calibration. |
| Rail-to-rail output stage | Delivers full-swing differential outputs (e.g., 0.05 V to 4.95 V on +5 V supply) to maximize ADC dynamic range. |
| VOCM-controlled common-mode level | Enables precise alignment of output midpoint to ADC reference (e.g., 0.5 V, 2.5 V, or AVDD/2) without external level-shifting circuitry. |
| Integrated ±15 V overvoltage protection | Eliminates need for external TVS or clamp diodes in industrial I/O modules interfacing ±10 V sensors. |
| Low 3.2 mA quiescent current | Supports power-sensitive applications such as portable instrumentation and battery-backed data loggers. |
Applications
| Industrial Process Control | High-Accuracy Data Acquisition |
|---|---|
Use Scenario: Conditioning ±10 V analog sensor outputs (e.g., strain gauge bridges, RTD transmitters) before digitization in PLC analog input modules. IC Role / Device Role / Timing Role: Precision attenuation, common-mode level shift, and differential conversion for 16-/18-bit SAR ADCs operating on +5 V supply. Use Value: Enables direct interface to industrial sensors without external op-amp stages or trimming components, reducing BOM count and layout area. | Use Scenario: Driving switched-capacitor front-end of 18-bit, 4 MSPS SAR ADCs in automated test equipment (ATE) channel cards. IC Role / Device Role / Timing Role: High-speed, low-noise differential driver with 50 V/µs slew rate and 50 ns 18-bit settling time. Use Value: Maintains signal integrity through fast acquisition cycles while suppressing harmonic distortion (−112 dB THD+N) and preserving SNR. |
| Single-Ended to Differential Conversion | Isolated Signal Conditioning |
Use Scenario: Converting single-ended outputs from instrumentation amplifiers (e.g., AD8421) into balanced differential signals for noise-immune transmission over PCB traces. IC Role / Device Role / Timing Role: Fully differential funnel amplifier with matched gain paths and VOCM-adjustable output centering. Use Value: Provides >90 dB output balance and <3 ppm/°C gain drift, eliminating common-mode pickup in long trace runs. | Use Scenario: Post-isolation signal conditioning in medical patient monitoring systems using digital isolators (e.g., ADuM4160) feeding ADCs. IC Role / Device Role / Timing Role: Low-power (3.2 mA), rail-to-rail differential driver accepting isolated single-ended signals and generating ADC-compatible differential pairs. Use Value: Minimizes power consumption in isolated domains while maintaining 18-bit linearity and low offset drift over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8476ARMZ | Fixed 0.5× gain only; identical 10-lead MSOP package; same VOCM, noise, and THD specs. | Lacks gain selectability; suitable where 0.5× attenuation suffices and board space is constrained. | Choose AD8476ARMZ if fixed 0.5× gain meets system requirements and simplifies design validation. |
| ADA4940-1ARZ | Unity-gain stable, wideband (13 GHz GBW), but requires external gain-setting resistors; no integrated overvoltage protection. | Higher bandwidth but lower DC precision (1.5 mV offset); needs external resistor matching for <0.1% gain accuracy. | Choose ADA4940-1ARZ only when >100 MHz small-signal bandwidth is required and external precision resistors are acceptable. |
Compared with AD8476ARMZ and ADA4940-1ARZ, the AD8475BRMZ uniquely combines pin-selectable 0.4/0.8 attenuation, ±15 V overvoltage tolerance, and guaranteed 0.05% gain error in a single monolithic solution-reducing design complexity and improving reliability in industrial ADC interfaces.
Availability
AD8475BRMZ is available at Aetrix Electronics and suitable for industrial process control, high-accuracy data acquisition, and isolated signal conditioning requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD8475BRMZ 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 AD8475 belongs to Analog Devices' precision signal conditioning portfolio, designed specifically to simplify high-fidelity analog-to-digital interfacing in industrial, instrumentation, and medical systems where accuracy, robustness, and ease of use are critical.
FAQ
What gain options does the AD8475BRMZ support, and how are they selected?
The AD8475BRMZ supports two precision attenuation gains: 0.4 and 0.8. Gain is selected by connecting the signal source to specific input pin pairs - use pins 1 (−IN 0.8x) and 10 (+IN 0.8x) for 0.8×, or pins 2 (−IN 0.4x) and 9 (+IN 0.4x) for 0.4×. No external components or configuration registers are required. This hardwired selection ensures consistent performance and eliminates timing or software dependencies in the AD8475BRMZ signal path.
Does the AD8475BRMZ require dual supplies, or can it operate from a single supply?
The AD8475BRMZ operates from either a single supply (3 V to 10 V) or dual supplies (±1.5 V to ±5 V). In single-supply mode, −VS is connected to ground, and VOCM is typically set to midsupply (e.g., 2.5 V on +5 V rail) to center the differential output. Its rail-to-rail output stage and internal common-mode feedback ensure full dynamic range utilization regardless of supply configuration - a key capability confirmed in the AD8475BRMZ datasheet specifications and functional diagrams.
How does the VOCM pin function in the AD8475BRMZ, and what happens if it's left unconnected?
The VOCM pin on the AD8475BRMZ sets the output common-mode voltage - the average of +OUT and −OUT. When driven to a specific voltage (e.g., 2.5 V), the internal common-mode feedback loop forces the output midpoint to match that value. If left unconnected, internal circuitry self-biases VOCM to midsupply, resulting in a nominal 2.5 V common-mode level on a +5 V supply. This behavior is explicitly specified in the AD8475BRMZ datasheet's VOCM Characteristics table and Theory of Operation section.
What is the maximum input voltage the AD8475BRMZ can tolerate without damage on a +5 V supply?
On a +5 V supply, the AD8475BRMZ withstands input voltages up to +VS + 10.5 V = +15.5 V and down to −VS − 16 V = −16 V, per its Absolute Maximum Ratings table. This translates to robust ±15 V overvoltage protection for industrial ±10 V sensor interfaces. The protection is implemented via integrated ESD diodes - a feature verified in the AD8475BRMZ datasheet's Absolute Maximum Ratings and General Description sections.
Can the AD8475BRMZ drive a 1 MΩ load, and what is its specified capacitive load limit?
The AD8475BRMZ is characterized for differential loads ≥200 Ω and specifies a maximum capacitive load of 30 pF per output. Driving a 1 MΩ resistive load is well within its capability - output swing remains rail-to-rail, and gain accuracy is preserved. However, exceeding 30 pF per output risks instability or degraded settling, as confirmed by frequency response plots (Figures 23, 26) and the Output Characteristics table in the AD8475BRMZ datasheet. For heavier capacitive loads, external isolation or buffering is required.
AD8475BRMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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:
- 10-MSOP
AD8475BRMZ FAQ
1.How can I place an order for AD8475BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8475BRMZ 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 AD8475BRMZ reliable?
The price and inventory of AD8475BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8475BRMZ is usually 5 days.
3.What payment methods are accepted for AD8475BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8475BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8475BRMZ?
AD8475BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8475BRMZ 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 AD8475BRMZ?
For technical support, including AD8475BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8475BRMZ requirements.
6.How does Aetrix verify that AD8475BRMZ is sourced from the original manufacturer or authorized distributors?
All AD8475BRMZ 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 AD8475BRMZ meets industry standards.
7.What is the process for return or replacement of AD8475BRMZ?
All AD8475BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8475BRMZ, 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 AD8475BRMZ part is unused and in its original packaging.
Return procedure for AD8475BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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