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Analog Devices Inc. AD8475BRMZ-R7
- Part No.:
- AD8475BRMZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8475BRMZ-R7.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:438
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Product details
Overview
AD8475BRMZ-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, ±15 V input overvoltage protection (at +5 V supply), 10 nV/√Hz output noise, and 500 µV max output offset. It interfaces industrial-level signals directly to 18-bit SAR ADCs up to 4 MSPS.
For engineers reviewing the AD8475BRMZ-R7 datasheet, AD8475BRMZ-R7 pinout, AD8475BRMZ-R7 application, or AD8475BRMZ-R7 equivalent, key selection criteria include gain configuration flexibility, VOCM-adjustable common-mode level shifting, robust input overvoltage tolerance, and compatibility with switched-capacitor ADC front-ends.
Technical Context
The AD8475BRMZ-R7 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 precise VOCM-regulated common-mode output control. Its internal summing nodes operate rail-to-rail, enabling accurate processing of inputs beyond supply rails.
Gain is set by selecting dedicated input pairs (+IN/–IN for 0.4× or 0.8×), not external resistors. The VOCM pin directly forces output common-mode voltage - self-biasing to midsupply if left open - and enables dynamic level shifting to match ADC input ranges without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Attenuation Gains | 0.4× and 0.8×, selected by input pin pairing - eliminates external resistor matching and reduces layout sensitivity. |
| Output Noise Density | 10 nV/√Hz at 1 kHz - supports high-resolution digitization of low-amplitude signals without added noise floor penalty. |
| Max Output Offset | 500 µV (B grade) - ensures <0.01% full-scale error when driving 18-bit ADCs with ±2.5 V differential range. |
| Slew Rate | 50 V/µs - enables clean settling to 18-bit precision within 50 ns for 2 V step outputs, critical for 4 MSPS acquisition. |
| Input Overvoltage Tolerance | ±15 V with +5 V supply - protects against transients in industrial sensor and PLC signal chains without external clamping. |
| Supply Range | Single: 3 V to 10 V; Dual: ±1.5 V to ±5 V - supports battery-powered and wide-input industrial systems. |
| THD + N | −112 dB at 100 kHz - preserves signal integrity for precision instrumentation and metrology applications. |
Pinout & Package
AD8475BRMZ-R7 is packaged in a 10-lead MSOP (3 mm × 3 mm), thermally enhanced with exposed paddle. 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN 0.8x) | Negative input for 0.8× attenuation path | Used with pin 10 to configure 0.8× gain; mismatched use degrades CMRR and gain accuracy. |
| 2 (−IN 0.4x) | Negative input for 0.4× attenuation path | Paired with pin 9 for 0.4× gain; internal 2.5 kΩ gain resistor sets attenuation ratio. |
| 3 (+VS) | Positive supply connection | Must be decoupled locally; powers both amplifier core and output stage; supports 3–10 V single-supply operation. |
| 4 (VOCM) | Output common-mode voltage reference | Directly sets VOUT,cm; open-circuit defaults to midsupply; enables dynamic level shifting for ADC input range optimization. |
| 5 (+OUT) | Noninverting differential output | Delivers rail-to-rail swing; drives one side of ADC differential input; 0.1 Ω output impedance minimizes loading effects. |
| 6 (−OUT) | Inverting differential output | Complements +OUT with precise amplitude/phase balance; output balance error ≤−90 dB ensures minimal even-order distortion. |
| 7 (NC) | No connect | Not internally bonded; must remain unconnected to avoid parasitic coupling or ESD path disruption. |
| 8 (−VS) | Negative supply connection | Required for dual-supply operation; tied to ground for single-supply use; thermal pad must be soldered to ground plane. |
| 9 (+IN 0.4x) | Positive input for 0.4× attenuation path | Paired with pin 2; forms matched 0.4× attenuator using internal 2.5 kΩ/1 kΩ resistor network. |
| 10 (+IN 0.8x) | Positive input for 0.8× attenuation path | Paired with pin 1; uses internal 1.25 kΩ/1 kΩ network for higher gain; same precision as 0.4× path. |
Key Features
| Feature | Design Value |
|---|---|
| Precision laser-trimmed resistor networks | Guarantees ≤0.05% gain error and ≥86 dB CMRR - eliminates need for external 0.01% matched resistors in discrete solutions. |
| Rail-to-rail output stage | Swings within 50 mV of rails on ±5 V or +5 V supplies - maximizes ADC dynamic range utilization without headroom loss. |
| VOCM-controlled common-mode level shifting | Enables precise alignment of output common-mode voltage to ADC input requirements (e.g., 0.9 V, 1.25 V, 2.5 V) without external op amps or dividers. |
| Integrated ±15 V input overvoltage protection | Withstands industrial transients up to ±15 V on +5 V supply - removes need for external TVS diodes or series current-limiting resistors. |
| Low 3.2 mA quiescent current | Supports power-sensitive designs including portable instrumentation and always-on sensor interfaces while maintaining 150 MHz bandwidth. |
Applications
| Industrial Sensor Signal Conditioning | High-Accuracy Data Acquisition Systems |
|---|---|
Use Scenario: Amplifying and conditioning ±10 V output from strain-gauge bridges or RTD transmitters before digitization in factory automation controllers. IC Role / Device Role / Timing Role: Precision attenuation, common-mode level shifting, and single-ended-to-differential conversion - replaces discrete op amp + resistor network + level shifter. Use Value: Enables direct interface to 18-bit SAR ADCs (e.g., AD7960) with no external passive matching, reducing BOM count and layout sensitivity while preserving 0.001% linearity. | Use Scenario: Driving the differential inputs of pipeline or Σ-Δ ADCs in automated test equipment requiring 16–18 bit resolution at up to 4 MSPS sampling rates. IC Role / Device Role / Timing Role: High-speed, low-noise ADC driver with fast settling (50 ns to 0.001%) and −112 dB THD+N - ensures accurate capture of fast transient waveforms. Use Value: Eliminates gain/offset drift errors across temperature (3 ppm/°C gain drift, 2.5 µV/°C offset drift), maintaining calibration stability over −40°C to +85°C operating range. |
| Single-Ended Legacy System Upgrades | Isolated Analog Front-Ends |
Use Scenario: Retrofitting legacy 0–10 V or ±5 V analog outputs into modern differential-input data loggers or IoT edge nodes. IC Role / Device Role / Timing Role: Single-ended-to-differential converter with programmable gain and VOCM-adjustable output swing - simplifies redesign of existing PCBs. Use Value: Reduces design cycle time by removing need for custom gain/level-shifting circuitry; pin-selectable gain avoids firmware changes during hardware revision. | Use Scenario: Interfacing isolated voltage/current sensors (e.g., AMC1301-based) to precision ADCs in motor drives or energy meters where galvanic isolation is mandatory. IC Role / Device Role / Timing Role: Post-isolation signal conditioner that restores full-scale differential swing and rejects common-mode noise injected across isolation barrier. Use Value: Achieves >86 dB CMRR up to 100 kHz (Figure 16), suppressing switching noise from isolated DC/DC converters and gate drivers without additional filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8476ARMZ-R7 | Fixed 0.5× gain only; identical 10-lead MSOP package; 12 nV/√Hz noise; 600 µV max offset. | Lacks pin-selectable gain - requires redesign if system needs both 0.4× and 0.8× configurations. | Select AD8476ARMZ-R7 only when fixed unity-gain attenuation suffices and lower cost is prioritized over configurability. |
| ADA4941-1YCPZ-R7 | Unity-gain configurable differential amplifier; no integrated attenuation; 2.9 nV/√Hz noise; 125 µV max offset; requires external gain-setting resistors. | Higher precision but demands 0.1% external resistor matching for gain accuracy - increases BOM and layout complexity. | Choose ADA4941-1YCPZ-R7 when ultra-low noise (<3 nV/√Hz) and lowest offset are critical, and external resistor placement can be tightly controlled. |
Compared with AD8475BRMZ-R7, AD8476ARMZ-R7 trades gain flexibility for slightly lower cost and identical footprint, while ADA4941-1YCPZ-R7 offers superior noise/offset performance at the expense of external component dependency and reduced integration - making AD8475BRMZ-R7 optimal for rapid, high-accuracy ADC interface design with minimal external parts.
Availability
AD8475BRMZ-R7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, high-accuracy data acquisition systems, and single-ended legacy system upgrades requiring stable component supply and long-term production continuity.
Supply support for AD8475BRMZ-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 AD8475BRMZ-R7 belongs to Analog Devices' precision funnel amplifier product line, engineered specifically to simplify high-fidelity signal interfacing between industrial sensors and low-voltage differential-input ADCs without external passive matching.
FAQ
What gain options does the AD8475BRMZ-R7 support, and how are they selected?
The AD8475BRMZ-R7 supports two precision attenuation gains: 0.4× and 0.8×. Gain is selected by connecting the input signal to specific pin pairs - +IN 0.4x (pin 9) and −IN 0.4x (pin 2) for 0.4×, or +IN 0.8x (pin 10) and −IN 0.8x (pin 1) for 0.8×. Internal laser-trimmed resistors ensure ≤0.05% gain error at either setting. No external components or configuration registers are required for gain selection in AD8475BRMZ-R7.
Can the AD8475BRMZ-R7 drive switched-capacitor ADCs, and what makes it suitable?
Yes, the AD8475BRMZ-R7 is explicitly designed to drive switched-capacitor ADCs such as SAR and Σ-Δ types. Its high-current output stage (110 mA short-circuit limit), 50 V/µs slew rate, and 0.1 Ω output impedance enable fast, low-error charging of ADC sampling capacitors. The AD8475BRMZ-R7 settles to 18-bit precision in 50 ns, minimizing acquisition-time overhead and distortion - critical for high-speed, high-resolution digitization.
How does the VOCM pin function in the AD8475BRMZ-R7, and what happens if it's left unconnected?
The VOCM pin in AD8475BRMZ-R7 directly sets the output common-mode voltage (VOUT,cm). When driven with a stable voltage (e.g., 2.5 V), the outputs center precisely at that level. If left unconnected, internal feedback forces VOUT,cm to midsupply (e.g., 2.5 V on +5 V supply). This self-biasing behavior allows immediate operation without external biasing - a key feature distinguishing AD8475BRMZ-R7 from discrete or non-VOCM differential amplifiers.
What is the maximum input voltage the AD8475BRMZ-R7 can tolerate with a +5 V supply?
With a +5 V single supply, the AD8475BRMZ-R7 provides robust overvoltage protection up to ±15 V on its input pins - exceeding typical industrial signal levels (±10 V). This is achieved via integrated ESD diodes rated to +VS + 10.5 V and −VS − 16 V. The internal resistor divider safely attenuates overvoltage before it reaches sensitive amplifier nodes, eliminating the need for external protection circuitry in AD8475BRMZ-R7 designs.
Does the AD8475BRMZ-R7 require dual supplies, or can it operate on a single supply?
The AD8475BRMZ-R7 operates flexibly on either single or dual supplies. It supports single supplies from 3 V to 10 V (e.g., +5 V with −VS grounded) and dual supplies from ±1.5 V to ±5 V. Rail-to-rail output swing and VOCM-adjustable common-mode level ensure full dynamic range utilization in both configurations - making AD8475BRMZ-R7 suitable for battery-powered and industrial rail-flexible systems alike.
AD8475BRMZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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:
- 10-MSOP
AD8475BRMZ-R7 FAQ
1.How can I place an order for AD8475BRMZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8475BRMZ-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 AD8475BRMZ-R7 reliable?
The price and inventory of AD8475BRMZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8475BRMZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8475BRMZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8475BRMZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8475BRMZ-R7?
AD8475BRMZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8475BRMZ-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 AD8475BRMZ-R7?
For technical support, including AD8475BRMZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8475BRMZ-R7 requirements.
6.How does Aetrix verify that AD8475BRMZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8475BRMZ-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 AD8475BRMZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8475BRMZ-R7?
All AD8475BRMZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8475BRMZ-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 AD8475BRMZ-R7 part is unused and in its original packaging.
Return procedure for AD8475BRMZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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