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Analog Devices Inc. AD736KR-REEL
- Part No.:
- AD736KR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- RMS to DC Converters
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD736KR-REEL.pdf
- Description:
- IC RMS TO DC CONVERTER 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,358
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Product details
Overview
AD736KR-REEL from Analog Devices is a precision monolithic true RMS-to-DC converter IC designed for accurate ac/dc voltage measurement in portable and battery-powered instrumentation. It delivers ±0.3 mV ±0.3% reading accuracy at 200 mV rms input, supports crest factors up to 5, operates from ±2.8 V to ±16.5 V supplies, and draws only 200 µA quiescent current - enabling high-accuracy RMS measurement in handheld multimeters and power analyzers.
For engineers reviewing the AD736KR-REEL datasheet, AD736KR-REEL pinout, AD736KR-REEL application, or AD736KR-REEL equivalent, key selection considerations include its dual-input architecture (10¹² Ω FET input and 8 kΩ low-Z input), CAV-dependent settling time trade-offs, ±0.3% RMS accuracy over temperature, and SOIC-8 packaging for space-constrained designs.
Technical Context
The AD736KR-REEL implements a translinear RMS core with external averaging capacitor (CAV) to perform real-time squaring, averaging, and square-rooting of input waveforms. Its dual-input topology allows direct connection to high-impedance attenuators (Pin 2) or low-voltage, high-level signals (Pin 1), with independent frequency response: 33 kHz (1% error) and 190 kHz (−3 dB) at 200 mV rms on Pin 2.
It integrates a buffered output amplifier with optional low-pass filtering via CF, eliminating need for external op-amps. The internal bias section enables stable operation across −20°C to +85°C (K-grade), and its laser-trimmed design ensures no external trims are required to meet ±0.3 mV ±0.3% accuracy specifications with sine-wave inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| True RMS Accuracy | ±0.3 mV ±0.3% of reading at 200 mV rms (sine wave, 25°C, ±5 V) |
| Input Impedance (Pin 2) | 10¹² Ω - eliminates need for external buffer when interfacing with high-Z attenuators |
| Supply Current | 200 µA max - enables >1-year battery life in handheld multimeters using coin cells |
| Crest Factor Support | Up to 5 with ≤2.5% additional error at 200 mV rms - measures triac-phase-controlled and pulsed waveforms accurately |
| Operating Temp Range | −20°C to +85°C - qualified for commercial/industrial portable test equipment |
| Full-Scale Input Range | 200 mV rms (high-Z input); 300 mV rms (low-Z input at +2.8 V/−3.2 V supply) |
| Bandwidth (1% error) | 33 kHz at 200 mV rms (Pin 2) - sufficient for 50/60 Hz harmonics up to 15th order |
Pinout & Package
AD736KR-REEL is housed in an 8-lead SOIC package (small-outline integrated circuit), surface-mount compatible with standard reflow profiles and IPC-7351B footprint MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CC) | Coupling Capacitor / Low-Z Input | Accepts ac-coupled signals directly; also serves as 8 kΩ input for high-level/low-supply applications |
| 2 (VIN) | High-Impedance FET Input | 10¹² Ω input enables direct connection to 10×/100× probe attenuators without loading |
| 3 (CF) | Output Filter Capacitor Terminal | Connects external capacitor to reduce output ripple; sets post-RMS low-pass cutoff |
| 4 (−VS) | Negative Supply Rail | Ground reference in single-supply mode; −3.2 V min in dual-supply configuration |
| 5 (CAV) | Averaging Capacitor Terminal | Holds rectified signal for RMS computation; value (e.g., 10–100 µF) trades settling time vs. low-frequency accuracy |
| 6 (OUTPUT) | Buffered DC Output | Low-impedance (0.2 Ω), rail-to-rail capable output drives ADCs or meters directly |
| 7 (+VS) | Positive Supply Rail | +2.8 V min; supports wide supply range up to ±16.5 V for flexible system integration |
| 8 (COM) | Analog Ground Reference | Common return for input, output, and internal bias; must be low-impedance path to minimize noise |
Key Features
| Feature | Design Value |
|---|---|
| True RMS conversion | Measures arbitrary waveforms (pulsed, clipped, phase-controlled) with ≤2.5% added error at crest factor 5 |
| No external trims required | Laser-trimmed die achieves ±0.3 mV ±0.3% accuracy without calibration potentiometers or firmware compensation |
| Dual-input architecture | Simultaneous support for high-Z (10¹² Ω) and low-Z (8 kΩ) inputs enables one IC to serve multiple front-end topologies |
| Ultra-low power consumption | 200 µA max supply current allows use in always-on battery-powered instruments with multi-year runtime |
| Integrated output buffer | Eliminates need for external op-amp; drives 2 kΩ loads directly while maintaining linearity and low offset |
Applications
| Handheld Digital Multimeter | Industrial Power Quality Analyzer |
|---|---|
|
Use Scenario: Measuring RMS voltage/current of non-sinusoidal mains feed in field service tools. IC Role / Device Role / Timing Role: True RMS core computes heating-equivalent value of distorted 50/60 Hz waveforms including harmonics and transients. Use Value: Delivers ±0.3% accuracy at crest factor 3–5, enabling compliance verification per IEC 61000-4-30 Class A standards without external DSP. |
Use Scenario: Real-time monitoring of motor drive output voltage in factory automation systems. IC Role / Device Role / Timing Role: Converts variable-duty-cycle PWM and phase-angle controlled outputs into stable DC representation for microcontroller sampling. Use Value: Maintains <1% error up to 10 kHz bandwidth (−3 dB), supporting accurate THD and harmonic analysis up to 5th order. |
| Battery-Powered Clamp Meter | Energy Harvesting Sensor Node |
|
Use Scenario: Portable clamp-on current measurement where size and battery life are critical constraints. IC Role / Device Role / Timing Role: High-impedance input interfaces directly with Rogowski coil integrator; low 200 µA supply current extends AA battery life beyond 2 years. Use Value: Enables full-scale 200 mV rms measurement with no external gain stage, reducing BOM count and PCB area by 30% vs. discrete solutions. |
Use Scenario: Self-powered environmental sensor measuring AC-coupled vibration or leakage current in remote locations. IC Role / Device Role / Timing Role: Operates from harvested energy (e.g., piezoelectric source) with ±2.8 V minimum supply; resolves 100 µV rms signals in ac-coupled mode. Use Value: Achieves 100 µV rms sensitivity without preamplification, enabling detection of sub-millig acceleration or nanoamp leakage currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar true RMS conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD737JRZ-REEL7 | Includes power-down mode (25 µA standby); dc output polarity is negative; output impedance 8 kΩ (unbuffered) | Preferred for intermittent-read applications (e.g., data loggers) where duty-cycled operation saves power | Select AD737JRZ-REEL7 only if negative output polarity and ultra-low standby current are required; not drop-in due to output buffering and polarity differences |
| MAX9926ASA+ | Higher bandwidth (2 MHz), but requires external op-amp for buffering; ±1% accuracy; 1.8 V min supply | Suitable for high-speed RMS measurement in automotive battery monitors or fast-switching SMPS feedback | Choose MAX9926ASA+ only when >100 kHz bandwidth is mandatory; AD736KR-REEL offers superior accuracy and integrated buffer at lower cost |
Compared with AD737JRZ-REEL7 and MAX9926ASA+, the AD736KR-REEL provides the best balance of accuracy (±0.3%), integrated output buffering, and low-quiescent-current operation - making it optimal for portable test equipment where measurement fidelity and simplicity outweigh raw speed or ultra-low standby needs.
Availability
AD736KR-REEL is available at Aetrix Electronics and suitable for handheld multimeters, industrial power quality analyzers, and battery-powered clamp meters requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.
Supply support for AD736KR-REEL 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA, with R&D and manufacturing facilities worldwide.
The AD736 belongs to Analog Devices' precision signal conditioning product line, engineered specifically for metrology-grade RMS measurement in portable, low-power, and high-accuracy instrumentation applications.
FAQ
What is the operating temperature range for the AD736KR-REEL?
The AD736KR-REEL is rated for −20°C to +85°C, corresponding to the K-grade performance specification. This range covers commercial and extended industrial environments, including handheld test equipment used outdoors or in uncontrolled factory settings. The AD736KR-REEL maintains ±0.3 mV ±0.3% RMS accuracy across this full range when used with recommended CAV and CF values.
Does the AD736KR-REEL require external calibration components?
No, the AD736KR-REEL does not require external trims or calibration components to achieve its specified ±0.3 mV ±0.3% accuracy. It is laser-trimmed at wafer level for transfer function, offset, and temperature drift. Only two passive external capacitors - CAV (averaging) and CF (output filter) - are needed for basic RMS operation, and CC (input coupling) if ac-coupling is used.
Can the AD736KR-REEL measure both AC and DC input voltages?
Yes, the AD736KR-REEL computes the true RMS value of combined ac + dc input signals. In dc-coupled mode (CC pin grounded), it measures total RMS including dc offset. In ac-coupled mode (CC pin connected to VIN via capacitor), it rejects dc and measures ac-only RMS down to 100 µV rms. The AD736KR-REEL's dual-input architecture supports both configurations without hardware change.
What is the maximum crest factor the AD736KR-REEL can handle with minimal error?
The AD736KR-REEL maintains high accuracy up to crest factor 5, introducing only 2.5% additional error at 200 mV rms full-scale input. This capability enables reliable measurement of highly peaked waveforms such as triac-dimmed lighting, switched-mode power supply outputs, and motor startup currents - all within the AD736KR-REEL's specified error envelope.
How does the AD736KR-REEL differ from average-responding converters?
Unlike average-responding converters - which assume sinusoidal input and scale rectified average by 1.11 - the AD736KR-REEL performs true mathematical RMS calculation (Vrms = √Avg(V²)). This yields correct readings for non-sinusoidal waveforms: e.g., symmetrical square waves (error <0.5% vs. +11% for average types) and Gaussian noise (error <2.5% vs. −11.4%). The AD736KR-REEL's accuracy is waveform-agnostic, not calibration-dependent.
AD736KR-REEL 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
- Current - Supply:
- 160 µA
- Voltage - Supply:
- 2.8V, -3.2V ~ ±16.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD736KR-REEL FAQ
1.How can I place an order for AD736KR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD736KR-REEL 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 AD736KR-REEL reliable?
The price and inventory of AD736KR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD736KR-REEL is usually 5 days.
3.What payment methods are accepted for AD736KR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD736KR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD736KR-REEL?
AD736KR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD736KR-REEL 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 AD736KR-REEL?
For technical support, including AD736KR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD736KR-REEL requirements.
6.How does Aetrix verify that AD736KR-REEL is sourced from the original manufacturer or authorized distributors?
All AD736KR-REEL 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 AD736KR-REEL meets industry standards.
7.What is the process for return or replacement of AD736KR-REEL?
All AD736KR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD736KR-REEL, 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 AD736KR-REEL part is unused and in its original packaging.
Return procedure for AD736KR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD736KR-REEL Tags
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AD8436JCPZ-R7
Analog Devices Inc.
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LTC1966CMS8#PBF
Analog Devices Inc.
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LTC1966CMS8#TRPBF
Analog Devices Inc.
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LTC1967CMS8#PBF
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AD736ARZ
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LTC1968CMS8#PBF
Analog Devices Inc.
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LTC1968CMS8#TRPBF
Analog Devices Inc.
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AD737JRZ-R7
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AD737JRZ
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