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Analog Devices Inc. AD8646WARMZ-R7
- Part No.:
- AD8646WARMZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8646WARMZ-R7.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:13,156
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Product details
Overview
AD8646WARMZ-R7 from Analog Devices is a dual, rail-to-rail input/output precision operational amplifier optimized for automotive-grade operation (−40°C to +125°C), featuring 24 MHz gain bandwidth, 11 V/μs slew rate, 2.5 mV max offset voltage, and 8 nV/√Hz voltage noise density at 1 kHz. It operates from 2.7 V to 5.5 V single supply and delivers ±120 mA short-circuit output current - ideal for photodiode amplification and sensor signal conditioning in automotive ADAS front-ends.
For engineers reviewing the AD8646WARMZ-R7 datasheet, AD8646WARMZ-R7 pinout, AD8646WARMZ-R7 application, or AD8646WARMZ-R7 equivalent, key selection criteria include its AEC-Q100 qualified automotive temperature range, low 1 pA typical input bias current, rail-to-rail swing capability enabling direct interfacing with CMOS ADCs/DACs, and guaranteed performance across full −40°C to +125°C operating range without derating.
Technical Context
The AD8646WARMZ-R7 implements a bipolar-input, unity-gain-stable architecture delivering 24 MHz GBP with 74° phase margin at 5 V supply, supporting high-fidelity signal acquisition in multipole filters and precision instrumentation. Its rail-to-rail input stage accepts common-mode voltages from ground to VSY, while rail-to-rail output drives loads down to 2 kΩ with <20 mV VOL and >4.98 V VOH at 1 mA.
Designed for single-supply systems, it maintains 84 dB CMRR and 116 dB large-signal voltage gain at 25°C, with input capacitance of 2.5 pF (differential) and 6.7 pF (common-mode), enabling stable operation with capacitive sensors and photodiodes without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 24 MHz - supports closed-loop gain ≥10 up to 2.4 MHz, suitable for anti-aliasing and reconstruction filters. |
| Slew Rate | 11 V/μs - enables clean 10 VPP output at 175 kHz without slewing distortion. |
| Input Offset Voltage | 2.5 mV max - ensures ≤0.5% error in 500 mV full-scale sensor interfaces. |
| Supply Current per Amplifier | 2.0 mA max - allows dual-channel operation under 4.5 mA total, compatible with battery-powered modules. |
| Voltage Noise Density | 8 nV/√Hz at 1 kHz - critical for low-level photodiode and strain gauge signal integrity. |
| Operating Temperature Range | −40°C to +125°C - qualified per AEC-Q100 Grade 1, validated for under-hood automotive use. |
| Input Bias Current | 1 pA typical - preserves high-impedance node stability in pH and ion-selective electrode circuits. |
Pinout & Package
AD8646WARMZ-R7 is housed in an 8-lead MSOP (RM-8) package, 3.0 mm × 3.0 mm × 0.85 mm body, with exposed pad for thermal enhancement. Pin 1 marked by dot; pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Amplifier A output | Capable of sourcing/sinking ±120 mA; rail-to-rail swing enables direct DAC buffering. |
| 2 (–INA) | Inverting input A | High-impedance node (1 pA bias); differential capacitance 2.5 pF limits stray pickup in high-Z sensor paths. |
| 3 (+INA) | Non-inverting input A | Accepts 0 V to VSY common-mode; matched to –INA for <0.5 pA offset current. |
| 4 (V–) | Negative supply / ground reference | Single-supply operation: tied to system GND; internal ESD protection to ±2 kV HBM. |
| 5 (V+) | Positive supply | 2.7 V to 5.5 V range; PSRR 80 dB minimizes supply ripple coupling into signal path. |
| 6 (+INB) | Non-inverting input B | Electrically isolated from Channel A; channel separation −115 dB at 10 kHz prevents crosstalk in dual-sensor systems. |
| 7 (–INB) | Inverting input B | Matched to +INB; same bias current and capacitance specs as Channel A inputs. |
| 8 (OUTB) | Amplifier B output | Independent output stage; no internal connection to OUTA - supports dual-path signal processing. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization with 2.7 V–5.5 V supplies, eliminating level-shifting in single-supply data acquisition. |
| Low input bias current (1 pA typ) | Maintains accuracy in high-impedance transducer interfaces (e.g., piezoelectric sensors, glass electrodes) without guard traces. |
| No phase reversal | Prevents output latch-up during input overdrive - critical for fault-tolerant automotive sensor monitoring. |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood environments; includes HTOL, TC, and ESD testing per stress test conditions. |
| Unity-gain stable | Operates reliably with gain = 1 without external compensation, simplifying PCB layout for buffer applications. |
Applications
| Photodiode Signal Conditioning | Automotive Sensor Front-End |
|---|---|
Use Scenario: Amplifying low-current output (pA–nA) from avalanche photodiodes in LiDAR receiver modules. IC Role / Device Role / Timing Role: Transimpedance amplifier with 2.5 mV offset and 8 nV/√Hz noise preserving SNR in 100 ns pulse detection. Use Value: Enables sub-5 cm distance resolution at 1550 nm wavelength by minimizing input-referred noise floor. | Use Scenario: Signal conditioning for MEMS pressure sensors in brake-by-wire hydraulic control units. IC Role / Device Role / Timing Role: Dual-channel buffer and gain stage with matched channels ensuring <0.1% inter-channel gain error across −40°C to +125°C. Use Value: Eliminates calibration drift over lifetime, meeting ISO 26262 ASIL-B functional safety requirements. |
| CMOS ADC Driver | Portable Medical Instrumentation |
Use Scenario: Driving SAR ADC inputs (e.g., AD7980) in battery-powered portable ECG monitors. IC Role / Device Role / Timing Role: Rail-to-rail output buffer ensuring full-scale 0–5 V swing into 10 kΩ || 20 pF ADC input. Use Value: Achieves >14-bit ENOB by maintaining THD+N <0.021% at 25 kHz with AV = −10 configuration. | Use Scenario: Low-power analog front-end for handheld blood glucose meters using electrochemical test strips. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with 1 pA bias current minimizing strip polarization error. Use Value: Reduces measurement uncertainty to ±2 mg/dL across 20–600 mg/dL range, meeting CLIA accuracy standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8646ARMZ-R7 | Same silicon, identical electrical specs, but not AEC-Q100 qualified; rated −40°C to +125°C without automotive stress testing. | Not approved for automotive safety-critical systems; acceptable for industrial or consumer-grade medical devices. | Select AD8646WARMZ-R7 when AEC-Q100 compliance is mandatory; choose AD8646ARMZ-R7 for cost-sensitive non-automotive designs requiring identical performance. |
| TSV912IQ2T | Lower bandwidth (8 MHz), higher offset (3.5 mV max), but lower supply current (800 µA/amplifier); not automotive qualified. | Better suited for ultra-low-power sensor nodes where bandwidth <1 MHz suffices and battery life is primary. | Choose TSV912IQ2T only if 24 MHz bandwidth and 1 pA bias current are not required; AD8646WARMZ-R7 remains superior for precision timing-critical signal chains. |
Compared with AD8646ARMZ-R7, AD8646WARMZ-R7 adds formal AEC-Q100 qualification with extended reliability testing, while versus TSV912IQ2T it delivers 3× higher bandwidth and 10× lower input bias current - essential for photodiode and high-impedance sensor applications demanding fidelity across automotive temperature extremes.
Availability
AD8646WARMZ-R7 is available at Aetrix Electronics and suitable for automotive ADAS subsystems, medical diagnostic equipment, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8646WARMZ-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 AD8646 product line delivers precision dual op-amps engineered for automotive, medical, and industrial applications demanding low noise, rail-to-rail operation, and guaranteed performance across −40°C to +125°C.
FAQ
What is the maximum operating junction temperature for AD8646WARMZ-R7?
The AD8646WARMZ-R7 has a maximum junction temperature of 150°C, as specified in the Absolute Maximum Ratings table. This limit applies regardless of ambient temperature or package type. Derating curves in Figure 40 confirm stable operation up to 125°C ambient at 2.0 mA supply current per amplifier, making AD8646WARMZ-R7 suitable for under-hood automotive environments where board-level temperatures approach 105°C.
Does AD8646WARMZ-R7 support dual-supply operation?
Yes, AD8646WARMZ-R7 supports dual-supply operation with ±1.35 V to ±2.75 V (total supply 2.7 V to 5.5 V), though its datasheet emphasizes single-supply use cases. The input common-mode range extends to V–, and output swings rail-to-rail - enabling true bipolar signal handling even with split rails. However, the device is not characterized for symmetric dual-supply AC performance beyond the specifications given for VSY = 5 V and VSY = 2.7 V single-ended configurations.
Is AD8646WARMZ-R7 pin-compatible with AD8647 or AD8648?
No, AD8646WARMZ-R7 is not pin-compatible with AD8647 or AD8648. AD8646WARMZ-R7 uses an 8-lead MSOP (RM-8) package with dual-amplifier pinout (OUTA, –INA, +INA, V–, V+, +INB, –INB, OUTB). AD8647 uses a 10-lead MSOP with shutdown pins (SDA/SDB), and AD8648 uses 14-lead SOIC/TSSOP for quad configuration. PCB layout must be redesigned to migrate between these families.
What is the typical input capacitance of AD8646WARMZ-R7 and how does it affect high-frequency stability?
The AD8646WARMZ-R7 exhibits 2.5 pF differential input capacitance and 6.7 pF common-mode input capacitance. These values interact with source impedance to form poles that may degrade phase margin - for example, a 10 kΩ source resistance creates a 6.4 MHz pole with 2.5 pF. Stability analysis in Figure 16 confirms 74° phase margin at 5 V supply, but designers must limit source impedance to <1 kΩ for unity-gain stable operation above 10 MHz to avoid peaking or oscillation.
How does the AD8646WARMZ-R7 perform in photodiode transimpedance applications at 125°C?
At 125°C, AD8646WARMZ-R7 maintains 116 dB open-loop gain and 67 dB CMRR, with input bias current rising to 550 pA max - still sufficient for most photodiode applications where dark current dominates. Output drive capability remains ±120 mA, and noise increases only marginally (en ≈ 8.5 nV/√Hz at 1 kHz). The −40°C to +125°C qualification ensures all parameters meet datasheet limits across this range, making AD8646WARMZ-R7 viable for high-temperature LiDAR and exhaust gas sensing.
AD8646WARMZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 11V/µs
- Gain Bandwidth Product:
- 24 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.3 pA
- Voltage - Input Offset:
- 600 µV
- Current - Supply:
- 1.5mA (x2 Channels)
- Current - Output / Channel:
- 120 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8646WARMZ-R7 FAQ
1.How can I place an order for AD8646WARMZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8646WARMZ-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 AD8646WARMZ-R7 reliable?
The price and inventory of AD8646WARMZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8646WARMZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8646WARMZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8646WARMZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8646WARMZ-R7?
AD8646WARMZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8646WARMZ-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 AD8646WARMZ-R7?
For technical support, including AD8646WARMZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8646WARMZ-R7 requirements.
6.How does Aetrix verify that AD8646WARMZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8646WARMZ-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 AD8646WARMZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8646WARMZ-R7?
All AD8646WARMZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8646WARMZ-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 AD8646WARMZ-R7 part is unused and in its original packaging.
Return procedure for AD8646WARMZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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