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Analog Devices Inc. AD737JR-5-REEL
- Part No.:
- AD737JR-5-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- RMS to DC Converters
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD737JR-5-REEL.pdf
- Description:
- IC RMS TO DC CONVERTER 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,706
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Product details
Overview
AD737JR-5-REEL from Analog Devices is a monolithic, laser-trimmed true RMS-to-DC converter optimized for ±2.5 V dual-supply operation. It computes true RMS, average rectified, and absolute values of ac/dc signals with ±0.2 mV ± 0.3% reading accuracy, 10¹² Ω input impedance, and 25 µA typical standby current - enabling high-precision measurement in portable multimeters and battery-powered instrumentation.
For engineers reviewing the AD737JR-5-REEL datasheet, AD737JR-5-REEL pinout, AD737JR-5-REEL application, or AD737JR-5-REEL equivalent, key selection considerations include its negative-going output polarity, single external averaging capacitor (CAV) requirement, ±2.5 V supply validation, crest factor support up to 5, and compatibility with 3½-digit CMOS ADCs without output buffering.
Technical Context
The AD737JR-5-REEL implements a four-stage analog architecture: FET-input amplifier (Pin 2), full-wave precision rectifier, rms core (requiring external CAV), and bias-controlled power-down section. Its rms computation relies on squaring, averaging (via CAV), and square-rooting - all performed in analog domain without digital processing.
It supports dual input paths: high-Z FET input (Pin 2, 10¹² Ω, 25 pA bias) for attenuator-coupled signals, and low-Z resistive input (Pin 1, 8 kΩ) for direct voltage-to-current conversion. Power-down is activated by pulling Pin 3 high, reducing supply current from 160 µA to 25 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±2.5 V (tested and specified - enables ultra-low-voltage portable designs) |
| Total Error | ±0.2 mV ± 0.3% of reading (at 0–200 mV rms, sine wave, TA = 25°C) |
| Input Impedance | 10¹² Ω (high-Z FET input at Pin 2 - minimizes loading on high-impedance sources) |
| Standby Current | 25 µA typical (power-down mode - extends battery life in handheld DVMs) |
| Output Polarity | Negative-going (dc output referenced to COM - requires inverted ADC interface or op-amp level shift) |
| Crest Factor Support | Up to 5 (maintains ≤2.5% additional error with CAV = 100 µF - suitable for phase-controlled SCR waveforms) |
| Bandwidth (1% error) | 33 kHz at 200 mV rms input (high-Z path - sufficient for audio and power line harmonics) |
| Averaging Capacitor | External CAV required (33 µF typical - sets settling time and low-frequency accuracy) |
Pinout & Package
AD737JR-5-REEL is housed in an 8-lead SOIC_N (R-8) package, 3.9 mm × 4.9 mm, with standard JEDEC MS-012AC footprint and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CC) | Coupling Capacitor / Low-Z Input | Alternative 8 kΩ input node; also connects external coupling cap for indirect ac coupling to Pin 2 |
| 2 (VIN) | High-Z RMS Input | FET-gate input with 10¹² Ω impedance - used for direct high-impedance signal injection |
| 3 (POWER DOWN) | Enable/Disable Control | Active-low enable: grounded = active; pulled high = 25 µA standby mode |
| 4 (–VS) | Negative Supply Rail | Connects to –2.5 V rail; must be stable and low-noise for accuracy |
| 5 (CAV) | Averaging Capacitor Terminal | Connects external capacitor (e.g., 33 µF) - defines rms averaging time constant and low-frequency error |
| 6 (OUTPUT) | Negative DC Output | Unbuffered output; voltage is negative w.r.t. COM - drives high-Z ADCs directly |
| 7 (+VS) | Positive Supply Rail | Connects to +2.5 V rail; supplies both input and core sections |
| 8 (COM) | Analog Ground Reference | Common return for input, output, and supply - must be low-impedance and separate from digital ground |
Key Features
| Feature | Design Value |
|---|---|
| True RMS computation | Accurate for arbitrary waveforms (sine, square, pulse, SCR) - eliminates calibration dependency on waveform shape |
| No external trims required | Laser-trimmed at wafer level - achieves ±0.2 mV ± 0.3% error without user adjustment |
| Single external capacitor | Only CAV needed for rms operation - reduces BOM count and layout complexity vs. multi-capacitor solutions |
| High input impedance | 10¹² Ω at Pin 2 - prevents signal source loading in high-Z probe circuits and sensor interfaces |
| Low power-down current | 25 µA standby - enables automatic sleep/wake in battery-operated meters without microcontroller intervention |
| Direct 3½-digit ADC interface | Output compatible with CMOS ADC inputs (e.g., ICL7135) - no buffer op amp needed for basic DVM designs |
Applications
| Portable Digital Multimeter | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld DVM measuring ac mains, audio signals, and variable-duty-cycle waveforms in field service. IC Role / Device Role / Timing Role: True RMS front-end converter generating calibrated dc output proportional to input rms voltage. Use Value: Delivers ±0.3% reading accuracy across crest factors up to 5 without waveform-specific calibration - critical for verifying non-sinusoidal industrial loads. | Use Scenario: Low-power data logger capturing ac sensor outputs (e.g., current transformers, piezoelectric transducers) over extended periods. IC Role / Device Role / Timing Role: Precision analog signal conditioner converting ac sensor output to stable dc for microcontroller ADC sampling. Use Value: 25 µA standby current and ±2.5 V supply operation extend battery life beyond 1 year in intermittent-read applications. |
| Industrial SCR Phase-Control Monitoring | Audio Level Detection |
Use Scenario: Monitoring output of triac/SCR dimmers and motor controllers where waveform distortion exceeds 40% THD. IC Role / Device Role / Timing Role: Crest-factor-tolerant RMS detector feeding control loop or display driver. Use Value: Maintains ≤2.5% additional error at crest factor 5 with CAV = 100 µF - enables accurate thermal load estimation in phase-fired controllers. | Use Scenario: VU meter or speech-level detector in voice-recognition hardware or broadcast equipment. IC Role / Device Role / Timing Role: Real-time RMS envelope follower for dynamic range compression or loudness normalization. Use Value: 33 kHz bandwidth at 200 mV rms and 18 ms settling time (300 Hz cutoff) support fast response to speech transients without overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar true RMS-to-DC conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD736JRZ-REEL | Positive-going output polarity; identical architecture and accuracy specs but different output sign convention | Eliminates need for external inverting stage when interfacing to unipolar ADCs or displays | Select AD736JRZ-REEL if system requires positive output voltage referenced to COM |
| AD8436ARQZ-R7 | Higher accuracy (±0.05% reading), wider supply range (±2.5 V to ±16.5 V), integrated output buffer, and lower 12 µA quiescent current | Supports higher-precision bench instruments and automated test equipment requiring minimal external components | Select AD8436ARQZ-R7 for applications demanding sub-0.1% error and buffered output drive capability |
Compared with AD737JR-5-REEL, AD736JRZ-REEL offers identical performance with inverted output polarity - simplifying interface to unipolar systems - while AD8436ARQZ-R7 delivers significantly tighter accuracy and lower power, at the cost of higher unit price and larger die size.
Availability
AD737JR-5-REEL is available at Aetrix Electronics and suitable for portable multimeters, battery-powered instrumentation, industrial SCR monitoring, and audio level detection requiring stable component supply and long-term production continuity.
Supply support for AD737JR-5-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD737 belongs to Analog Devices' precision RMS-to-DC converter product line, designed specifically for cost-sensitive, low-power instrumentation where waveform-agnostic ac voltage measurement is essential - especially in handheld test equipment and energy-monitoring systems.
FAQ
What is the supply voltage specification for AD737JR-5-REEL?
The AD737JR-5-REEL is tested and specified for ±2.5 V dual-supply operation, distinguishing it from broader-range variants like AD737J or AD737A. This fixed supply condition ensures optimal accuracy and low-power performance in battery-constrained designs. The device remains functional across ±2.5 V to ±16.5 V, but datasheet guarantees - including total error and standby current - apply strictly at ±2.5 V for this grade.
Why does AD737JR-5-REEL have a negative-going output?
The AD737JR-5-REEL output is inherently negative-going with respect to COM due to its internal rms core topology and lack of output buffer amplifier. This design minimizes dc offset errors and preserves compatibility with high-input-impedance CMOS ADCs. To interface with unipolar systems, an external inverting op-amp stage (e.g., AD8541) or use of the pin-compatible AD736JRZ-REEL (positive output) is recommended.
How many external components does AD737JR-5-REEL require for basic RMS operation?
The AD737JR-5-REEL requires only one mandatory external component for true RMS operation: the averaging capacitor (CAV), typically 33 µF for general-purpose use. Additional optional components include CC (coupling cap), CF (post-filter cap), and scaling resistors - but CAV is the sole requirement to enable rms computation. No trimming potentiometers or calibration ICs are needed due to factory laser trimming.
What is the maximum crest factor supported by AD737JR-5-REEL, and how is it achieved?
The AD737JR-5-REEL supports crest factors up to 5 with ≤2.5% additional error when using CAV = 100 µF, as verified under ±2.5 V supply conditions. This capability stems from its analog squaring-and-averaging architecture and exponential settling behavior of the CAV diode network. For crest factor 5 waveforms (e.g., 50% duty-cycle SCR outputs), selecting CAV ≥ 82 µF per Table 6 ensures <1% averaging error at 60 Hz.
Is AD737JR-5-REEL RoHS compliant and lead-free?
Yes, AD737JR-5-REEL is RoHS compliant and lead-free. It is manufactured in Analog Devices' certified facilities using Pb-free SOIC_N packaging (R-8) with matte tin lead finish. The "-REEL" suffix indicates tape-and-reel packaging per EIA-481 standards, fully compatible with automated SMT assembly. Full compliance documentation, including substance declarations and test reports, is available via Analog Devices' Quality & Reliability portal.
AD737JR-5-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:
- 170 µA
- Voltage - Supply:
- 2.8V, -3.2V ~ ±16.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD737JR-5-REEL FAQ
1.How can I place an order for AD737JR-5-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD737JR-5-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 AD737JR-5-REEL reliable?
The price and inventory of AD737JR-5-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD737JR-5-REEL is usually 5 days.
3.What payment methods are accepted for AD737JR-5-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD737JR-5-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD737JR-5-REEL?
AD737JR-5-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD737JR-5-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 AD737JR-5-REEL?
For technical support, including AD737JR-5-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD737JR-5-REEL requirements.
6.How does Aetrix verify that AD737JR-5-REEL is sourced from the original manufacturer or authorized distributors?
All AD737JR-5-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 AD737JR-5-REEL meets industry standards.
7.What is the process for return or replacement of AD737JR-5-REEL?
All AD737JR-5-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD737JR-5-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 AD737JR-5-REEL part is unused and in its original packaging.
Return procedure for AD737JR-5-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD737JR-5-REEL Tags
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AD8436JCPZ-R7
Analog Devices Inc.
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LTC1966CMS8#PBF
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LTC1966CMS8#TRPBF
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