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Analog Devices Inc. AD8512BR-REEL7
- Part No.:
- AD8512BR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8512BR-REEL7.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,808
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Product details
Overview
AD8512BR-REEL7 from Analog Devices is a dual precision JFET operational amplifier optimized for high-impedance sensor signal conditioning and precision current measurement via shunt resistors. It delivers 400 µV max offset voltage, 25 pA typical input bias current at ±15 V, 8 nV/√Hz voltage noise at 1 kHz, and 0.1% settling in 500 ns - enabling accurate, low-drift amplification in medical instrumentation and automated test equipment.
For engineers reviewing the AD8512BR-REEL7 datasheet, AD8512BR-REEL7 pinout, AD8512BR-REEL7 application, or AD8512BR-REEL7 equivalent, key selection criteria include guaranteed low TCVOS (1 µV/°C typical), unity-gain stability with ≥52° phase margin, no output phase reversal under overvoltage, and robust capacitive load drive up to 1000 pF without oscillation.
Technical Context
The AD8512BR-REEL7 employs a JFET-input architecture delivering ultra-low input bias current (25 pA typ at ±15 V) and low input voltage noise (8 nV/√Hz at 1 kHz), making it suitable for photodiode amplifiers and high-Z sensor interfaces. Its fast slew rate (20 V/µs) and 8 MHz gain bandwidth support stable unity-gain buffering of DAC outputs with sub-900 ns 0.01% settling.
Unlike legacy JFET op amps, the AD8512BR-REEL7 eliminates output phase reversal when inputs exceed common-mode range and maintains stability driving ≥500 pF loads in noninverting configurations - critical for multipole filter design and precision I-V conversion circuits requiring minimal external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage (B Grade) | 0.4 mV max at 25°C - ensures ≤1 LSB error in 12-bit systems across full temperature range. |
| Input Bias Current | 25 pA typical at ±15 V - enables use with >1 GΩ source impedances without significant DC error. |
| Voltage Noise Density | 8 nV/√Hz at 1 kHz - supports low-noise amplification of microvolt-level sensor signals. |
| Gain Bandwidth Product | 8 MHz - provides sufficient loop gain for stable 10× closed-loop gain up to 800 kHz. |
| Settling Time (0.1%) | 500 ns for 0 V to 4 V step - matches or exceeds settling speed of 12-bit DACs for seamless buffering. |
| Phase Margin | 52° at ±15 V - guarantees unconditional stability with 2 kΩ || 1 nF loads, eliminating need for external compensation. |
| Supply Range | ±5 V to ±15 V - supports both low-power portable instrumentation and high-dynamic-range industrial systems. |
Pinout & Package
AD8512BR-REEL7 is housed in an 8-lead SOIC_N (R suffix) package, measuring 4.90 mm × 3.91 mm × 1.75 mm, with standard JEDEC MS-012AC footprint and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT A | Amplifier A output | Low-impedance buffered output capable of ±70 mA drive into 600 Ω loads at ±15 V. |
| 2: –IN A | Inverting input A | Differential input node with 12.5 pF capacitance; accepts common-mode voltages from −13.5 V to +13.0 V at ±15 V supply. |
| 3: +IN A | Noninverting input A | High-impedance JFET input (25 pA bias); used for reference or sensor connection in precision I-V and differential configurations. |
| 4: V– | Negative supply rail | Connects to system ground or negative rail; supports operation down to −15 V with ±18 V absolute max rating. |
| 5: V+ | Positive supply rail | Accepts up to +15 V; PSRR of 130 dB minimizes supply ripple coupling into output signal. |
| 6: OUT B | Amplifier B output | Independent output identical to OUT A; enables dual-channel signal processing without cross-talk degradation. |
| 7: –IN B | Inverting input B | Second differential input with matched specs to –IN A; supports dual-sensor or differential pair architectures. |
| 8: +IN B | Noninverting input B | Matched high-Z input for second channel; allows simultaneous amplification of two independent high-impedance sources. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Guaranteed absence of polarity inversion when inputs exceed common-mode range - prevents system lockup in overvoltage transients. |
| Capacitive load drive | Stable with ≥1000 pF in unity gain - eliminates need for isolation resistors in ADC driver or filter applications. |
| Low TCVOS | 1 µV/°C typical - limits drift-induced error to <12 µV over −40°C to +125°C, preserving accuracy in unregulated environments. |
| Fast overload recovery | ≤200 ns recovery from saturation - maintains fidelity during transient-laden signal acquisition (e.g., pulse oximetry). |
| Low THD + N | 0.0005% at 1 kHz - meets audio-grade linearity requirements while supporting precision DC-coupled measurement paths. |
Applications
| Photodiode Amplification | Precision Shunt Current Sensing |
|---|---|
|
Use Scenario: Amplifying nanoamp-level photocurrent from reverse-biased silicon photodiodes in spectrophotometers and gas analyzers. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with virtual-ground input and low-noise, low-bias-current JFET front-end. Use Value: 25 pA input bias current minimizes dark-current error; 8 nV/√Hz noise preserves SNR for weak optical signals. |
Use Scenario: Measuring bidirectional current through 10 mΩ–100 mΩ shunt resistors in motor control and battery management systems. IC Role / Device Role / Timing Role: High-side or low-side current-sense amplifier with rail-to-rail output swing and matched dual channels for differential sensing. Use Value: 400 µV max offset ensures <0.5% error at 100 mV full-scale; 0.1% settling enables real-time current monitoring at >1 MSPS rates. |
| Multipole Active Filters | Medical Instrumentation Signal Chain |
|
Use Scenario: Implementing 4th-order low-pass Bessel filters in ECG front-ends and data acquisition anti-aliasing stages. IC Role / Device Role / Timing Role: Unity-gain stable, high-slew-rate op amp configured as multiple 2-pole sections with precise pole placement. Use Value: 8 MHz GBP and 52° phase margin ensure monotonic step response and minimal group delay distortion across passband. |
Use Scenario: Buffering and amplifying low-amplitude bio-potential signals (e.g., EEG, EMG) in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with low 1/f noise and high CMRR (>100 dB) for rejecting electrode offset and interference. Use Value: 1 µV/°C TCVOS and 86 dB min CMRR maintain baseline stability and common-mode rejection across patient temperature variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual JFET op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2134PA | Higher 12 nV/√Hz noise at 1 kHz; 10 pA input bias current; 8 MHz GBP; not specified for −40°C to +125°C. | Better suited for audio line drivers than precision shunt sensing due to higher noise and narrower temp range. | Select AD8512BR-REEL7 when low noise (<9 nV/√Hz), extended temperature operation, or guaranteed low TCVOS is required. |
| TL072CDR | Higher 18 nV/√Hz noise; 30 pA input bias current; 3 MHz GBP; 10 mV max offset; no guaranteed 0.1% settling spec. | Cost-optimized general-purpose use; lacks precision specs needed for 12-bit+ measurement systems. | Choose AD8512BR-REEL7 for applications demanding ≤400 µV offset, sub-500 ns settling, or stable 1000 pF load drive. |
Compared with OPA2134PA and TL072CDR, AD8512BR-REEL7 offers superior dc precision (400 µV vs. 10 mV max offset), lower noise (8 vs. 12–18 nV/√Hz), and guaranteed performance across −40°C to +125°C - making it the only option qualified for high-reliability industrial and medical instrumentation.
Availability
AD8512BR-REEL7 is available at Aetrix Electronics and suitable for precision instrumentation, medical diagnostics, and industrial process control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8512BR-REEL7 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 design centers worldwide and ISO 9001-certified manufacturing.
The AD851x family was engineered specifically for precision, low-noise, high-impedance signal conditioning - targeting applications where JFET input characteristics, low drift, and fast settling are essential for measurement integrity.
FAQ
What is the operating temperature range for AD8512BR-REEL7?
The AD8512BR-REEL7 is fully specified over the extended industrial temperature range of −40°C to +125°C. All key parameters - including offset voltage, input bias current, and settling time - are guaranteed across this range, making AD8512BR-REEL7 suitable for under-hood automotive sensors, industrial PLC modules, and portable medical devices exposed to wide ambient swings.
Does AD8512BR-REEL7 require external compensation for unity-gain stability?
No, AD8512BR-REEL7 is unity-gain stable with ≥52° phase margin at ±15 V and remains stable driving up to 1000 pF capacitive loads in noninverting configurations. The internal compensation eliminates need for external components in standard buffer or gain-of-one applications - verified per Figure 29 and Table 1 in the Rev. K datasheet.
Can AD8512BR-REEL7 be used in photodiode transimpedance amplifier circuits?
Yes, AD8512BR-REEL7 is explicitly recommended for photodiode amplifiers due to its 25 pA typical input bias current, 8 nV/√Hz voltage noise at 1 kHz, and low input capacitance (12.5 pF differential). These traits minimize dark-current error and preserve signal-to-noise ratio in low-light detection - confirmed in the General Description and Applications sections of the AD8510/AD8512/AD8513 datasheet.
What is the maximum capacitive load AD8512BR-REEL7 can drive without oscillation?
AD8512BR-REEL7 is unconditionally stable driving up to 1000 pF in unity-gain configuration, as stated in the Capacitive Load Drive section (Page 15). With a 500 pF load, overshoot is reduced from 55% to <3% using a 100 Ω + 1 nF snubber network - enabling reliable use in ADC driver and active filter designs without layout-dependent instability.
Is AD8512BR-REEL7 pin-compatible with other dual op amps like the TL072?
No, AD8512BR-REEL7 is not pin-compatible with TL072 or OPA2134. While all three use 8-lead SOIC packages, AD8512BR-REEL7 follows the standard dual op amp pinout (OUT A, –IN A, +IN A, V–, V+, OUT B, –IN B, +IN B), whereas TL072 uses OUT A, –IN A, +IN A, V+, –IN B, +IN B, OUT B, V– - requiring PCB redesign for substitution.
AD8512BR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 8 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 25 pA
- Voltage - Input Offset:
- 80 µV
- Current - Supply:
- 2.2mA (x2 Channels)
- Current - Output / Channel:
- 70 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8512BR-REEL7 FAQ
1.How can I place an order for AD8512BR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8512BR-REEL7 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 AD8512BR-REEL7 reliable?
The price and inventory of AD8512BR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8512BR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD8512BR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8512BR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8512BR-REEL7?
AD8512BR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8512BR-REEL7 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 AD8512BR-REEL7?
For technical support, including AD8512BR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8512BR-REEL7 requirements.
6.How does Aetrix verify that AD8512BR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD8512BR-REEL7 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 AD8512BR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD8512BR-REEL7?
All AD8512BR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8512BR-REEL7, 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 AD8512BR-REEL7 part is unused and in its original packaging.
Return procedure for AD8512BR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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