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Analog Devices Inc. AD8031BRZ
- Part No.:
- AD8031BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8031BRZ.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,923
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Product details
Overview
AD8031BRZ from Analog Devices is a single-channel, rail-to-rail input/output voltage feedback operational amplifier optimized for high-speed, low-power applications. It delivers 80 MHz −3 dB bandwidth (G = +1), 30 V/μs slew rate, and 125 ns settling time to 0.1% while consuming only 800 μA quiescent current per amplifier at +5 V supply. It operates from +2.7 V to +12 V (or ±1.35 V to ±6 V), with output swing within 20 mV of either rail under light load - ideal for buffering high-speed ADCs in portable instrumentation.
For engineers reviewing the AD8031BRZ datasheet, AD8031BRZ pinout, AD8031BRZ application, or AD8031BRZ equivalent, key selection criteria include its rail-to-rail I/O capability at 2.7 V, 80 MHz bandwidth with <125 ns settling, THD of −62 dBc at 1 MHz, 15 mA output drive, and SOIC-8 package compatibility with industrial temperature range (−40°C to +85°C).
Technical Context
The AD8031BRZ employs an XFCB (eXtra Fast Complementary Bipolar) process and dual-input-stage architecture: a PNP pair active for common-mode voltages up to ~1.1 V below VCC, switching seamlessly to an NPN pair near the positive rail to enable true rail-to-rail input operation without phase reversal up to 500 mV beyond supplies. Its rail-to-rail output stage uses common-emitter transistors with ~25 Ω effective collector resistance.
This architecture sustains 80 MHz small-signal bandwidth and 30 V/μs slew rate while maintaining low distortion (−62 dBc @ 1 MHz, 2 Vp-p) and wide input CMVR (−0.2 V to +5.2 V on +5 V supply). The device achieves stable unity-gain operation with capacitive load drive up to 15 pF and exhibits PSRR >75 dB across supply variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 80 MHz at G = +1 - enables faithful amplification of signals up to ~12.7 MHz fundamental in video or data acquisition systems. |
| Slew Rate | 30 V/μs - supports full-scale 2 V step response in ≤67 ns, critical for fast-settling ADC drivers. |
| Settling Time | 125 ns to 0.1% - ensures accurate sampling of high-frequency waveforms without aperture error accumulation. |
| Supply Current | 800 μA per amplifier at +5 V - allows integration into battery-powered systems with multi-channel signal chains without thermal penalty. |
| Output Swing | Within 20 mV of rails (RL = 10 kΩ) - maximizes dynamic range in single-supply systems, e.g., 0–5 V ADC interface with 4.98 VOUT(HI). |
| Input Offset Voltage | ±0.5 mV (max, AD8031A grade) - reduces dc error in precision gain stages and sensor front-ends without trimming. |
| THD | −62 dBc @ 1 MHz, 2 Vp-p - meets SNR requirements for 10-bit+ digitization in portable test equipment. |
Pinout & Package
AD8031BRZ is housed in an 8-lead SOIC_N (R) package (body width 3.9 mm, JEDEC MS-012AA), RoHS-compliant, with standard gull-wing lead form. Thermal resistance θJA = 155°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | Internally unused; must be left floating or tied to ground per layout best practice. |
| 2 | Inverting Input (−IN) | Differential input node; accepts signals from −0.2 V to +5.2 V on +5 V supply with no phase reversal. |
| 3 | Non-Inverting Input (+IN) | Differential input node; supports rail-to-rail common-mode range and 1.6 pF input capacitance. |
| 4 | Negative Supply (−VS) | Ground reference for single-supply operation or negative rail in dual-supply mode (−1.35 V to −6 V). |
| 5 | No Connect | Internally unused; no electrical connection - avoid routing traces or vias. |
| 6 | Output (OUT) | Class-A/B rail-to-rail output capable of sourcing/sinking ±15 mA; swings to within 20 mV of rails under light load. |
| 7 | Positive Supply (+VS) | Primary power pin; supports 2.7 V to 12 V single supply or +1.35 V to +6 V in dual-rail configuration. |
| 8 | No Connect | Internally unused; electrically isolated - leave unconnected per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input | Input CMVR extends −0.2 V to +5.2 V on +5 V supply, enabling direct interfacing with sensors or DACs operating near supply rails. |
| Rail-to-rail output | Delivers 4.98 VOUT(HI) and 0.02 VOUT(LO) into 10 kΩ load - preserves full 5 V ADC input range without level-shifting circuitry. |
| Low distortion at high frequency | −62 dBc THD at 1 MHz ensures minimal harmonic contamination when driving SAR or sigma-delta ADCs. |
| Single-supply operation down to 2.7 V | Enables use in Li-ion (3.0–4.2 V) or two-cell alkaline (2.7–3.2 V) powered instruments without LDO overhead. |
| High capacitive load drive | Stable with up to 15 pF load at G = +2 - accommodates PCB trace capacitance and ADC input capacitance without external isolation. |
Applications
| Portable Oscilloscope Front-End | Medical ECG Signal Conditioning |
|---|---|
Use Scenario: Amplifying low-amplitude, high-frequency bioelectric signals (0.05–150 Hz) with minimal added noise before digitization in handheld ECG monitors. IC Role / Device Role / Timing Role: Primary gain stage and anti-aliasing filter driver; provides rail-to-rail output swing to maximize ADC utilization and low 15 nV/√Hz input voltage noise. Use Value: Enables 10+ bit effective resolution at 1 kSPS with <1 µVpp integrated noise over 150 Hz bandwidth, reducing post-processing complexity. | Use Scenario: Buffering 12-bit SAR ADC inputs in battery-powered portable oscilloscopes requiring >5 MSPS sampling and 100 kHz analog bandwidth. IC Role / Device Role / Timing Role: Unity-gain buffer with 125 ns settling and 80 MHz bandwidth; isolates ADC input capacitance from preceding signal chain. Use Value: Eliminates sampling aperture error and maintains ENOB >9.5 bits at 1 MSPS by ensuring full settling before conversion trigger. |
| Industrial Sensor Interface Module | Automotive Cabin Camera Preamp |
Use Scenario: Conditioning outputs from MEMS pressure or temperature sensors in factory automation nodes operating from 3.3 V rails. IC Role / Device Role / Timing Role: Precision gain stage with ±0.5 mV max VOS (AD8031A grade); provides 15 mA drive for long-line transmission or multiplexed channel switching. Use Value: Delivers <0.1% gain error over −40°C to +85°C without calibration, supporting ISO 50001-compliant energy monitoring accuracy. | Use Scenario: Driving image sensor analog outputs in automotive cabin cameras where EMI immunity and low power are critical. IC Role / Device Role / Timing Role: High-speed line driver with −86 dBc THD at 100 kHz and 4.6 Vp-p swing; interfaces directly to analog video ADCs. Use Value: Maintains NTSC/PAL-compatible differential gain/phase (<0.17%/0.11°) without external passive components, simplifying AEC-Q200-compliant design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-power op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA355IDBVR | 250 MHz GBW, 150 V/μs slew, 2.5 mA IQ; higher speed but 3× higher power; SO-5 package. | Targeted at RF/IF signal paths requiring >100 MHz closed-loop bandwidth; not optimized for sub-1 mW portable systems. | Select OPA355IDBVR only when bandwidth >100 MHz is mandatory and power budget allows ≥2.5 mA per channel. |
| LMH6612MMX | 80 MHz GBW, 36 V/μs slew, 1.1 mA IQ; slightly faster slew and higher output current (35 mA), same SO-8 footprint. | Better suited for driving heavier loads (e.g., coaxial cables, multiple ADC inputs) while retaining low-power advantage. | Choose LMH6612MMX when >15 mA output drive or improved PSRR (90 dB) is required without changing PCB layout. |
Compared with AD8031BRZ, OPA355IDBVR trades 3× higher quiescent current for 3× greater bandwidth, while LMH6612MMX offers marginally better drive strength and PSRR at modest IQ increase - making AD8031BRZ optimal for ultra-low-power, space-constrained 80 MHz applications where 15 mA drive suffices.
Availability
AD8031BRZ is available at Aetrix Electronics and suitable for high-speed data acquisition, portable instrumentation, and industrial sensor interface applications requiring stable component supply, extended temperature operation, and SOIC-8 package compatibility.
Supply support for AD8031BRZ 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 AD8031 forms part of Analog Devices' precision high-speed amplifier product line, engineered for applications demanding wide bandwidth, rail-to-rail operation, and ultra-low power consumption in single-supply systems - especially portable test equipment and battery-operated data converters.
FAQ
What supply voltage range does the AD8031BRZ support?
The AD8031BRZ operates from a single supply of +2.7 V to +12 V or dual supplies of ±1.35 V to ±6 V. At +2.7 V, it maintains full 80 MHz bandwidth and rail-to-rail I/O functionality, making it suitable for Li-ion and two-cell alkaline battery systems. Absolute maximum supply is 12.6 V, and operation outside the specified range risks permanent damage.
Does the AD8031BRZ require external compensation for unity-gain stability?
No, the AD8031BRZ is internally compensated for unity-gain stability and drives capacitive loads up to 15 pF without oscillation when configured as a follower (G = +1). This eliminates the need for external compensation networks in most ADC buffer and gain-stage applications, simplifying layout and reducing BOM count.
What is the maximum output current capability of the AD8031BRZ?
The AD8031BRZ delivers ±15 mA continuous output current into resistive loads. Short-circuit current is +28 mA (sourcing) and −46 mA (sinking) at +5 V supply. Output voltage swing degrades linearly with load: e.g., at 10 mA into 1 kΩ, swing is ~4.8 VHI/0.1 VLO - verified in datasheet Figure 40.
How does the AD8031BRZ achieve rail-to-rail input operation without phase reversal?
The AD8031BRZ uses a dual-input-stage architecture: a PNP pair active for lower common-mode voltages and an NPN pair engaged near VCC. Tail current is dynamically routed between pairs, preserving transconductance and preventing phase reversal up to 500 mV beyond either rail. This is confirmed in Figures 37 and 43 of the AD8031/AD8032 Rev. G datasheet.
Is the AD8031BRZ pin-compatible with other op-amps in SOIC-8 packages?
The AD8031BRZ pinout (NC, −IN, +IN, −VS, NC, OUT, +VS, NC) is specific to its internal architecture and not pin-compatible with generic SOIC-8 op-amps like the OP27 or TL072. Substitution requires verification of pin function mapping, supply range, and stability conditions - direct replacement is not guaranteed without circuit validation.
AD8031BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 35V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 80 MHz
- Current - Input Bias:
- 450 nA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 900µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8031BRZ FAQ
1.How can I place an order for AD8031BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8031BRZ 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 AD8031BRZ reliable?
The price and inventory of AD8031BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8031BRZ is usually 5 days.
3.What payment methods are accepted for AD8031BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8031BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8031BRZ?
AD8031BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8031BRZ 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 AD8031BRZ?
For technical support, including AD8031BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8031BRZ requirements.
6.How does Aetrix verify that AD8031BRZ is sourced from the original manufacturer or authorized distributors?
All AD8031BRZ 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 AD8031BRZ meets industry standards.
7.What is the process for return or replacement of AD8031BRZ?
All AD8031BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8031BRZ, 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 AD8031BRZ part is unused and in its original packaging.
Return procedure for AD8031BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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