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Analog Devices Inc. AD737JRZ-5
- Part No.:
- AD737JRZ-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- RMS to DC Converters
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD737JRZ-5.pdf
- Description:
- IC RMS TO DC CONVERTER 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,666
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Product details
Overview
AD737JRZ-5 from Analog Devices is a low-power, monolithic 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 standby current - enabling high-precision measurement in portable multimeters and battery-powered instrumentation.
For engineers reviewing the AD737JRZ-5 datasheet, AD737JRZ-5 pinout, AD737JRZ-5 application, or AD737JRZ-5 equivalent, key selection considerations include its negative-going output polarity, single external averaging capacitor (CAV) requirement, crest factor support up to 5, ±2.5 V supply validation, and compatibility with 3½-digit CMOS ADCs without output buffering.
Technical Context
The AD737JRZ-5 implements a precision analog computation chain: FET-input amplifier → full-wave rectifier → RMS core (squaring/averaging/square-rooting via external CAV capacitor). Its dual-input architecture supports high-Z (Pin 2) and low-Z (Pin 1) signal paths, with internal 8 kΩ scaling resistor enabling direct interfacing to attenuators or transducers.
It operates in two modes: true RMS (using CAV for averaging) and average-responding (bypassing CAV, using RC post-filter with CF). Power-down is activated by pulling Pin 3 high, reducing supply current from 160 µA to 25 µA - critical for handheld meter design where supply headroom and quiescent power are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±2.5 V (tested and specified - enables low-voltage battery operation) |
| Total Accuracy | ±0.2 mV ± 0.3% of reading (sine wave, 0–200 mV rms - defines baseline metrology grade) |
| Input Impedance | 10¹² Ω (FET input at Pin 2 - preserves signal integrity with high-Z sources like piezoelectric sensors) |
| Standby Current | 25 µA (power-down mode - extends battery life in intermittent-measurement applications) |
| Crest Factor Support | Up to 5 (with CAV = 100 µF - ensures accuracy on phase-controlled SCR waveforms and pulsed loads) |
| Output Polarity | Negative-going (output referenced to COM - requires inverted ADC input or level-shifting op amp) |
| Bandwidth (1% error) | 33 kHz at 200 mV rms (high-Z input - sufficient for audio and power line harmonics up to 5th order) |
Pinout & Package
AD737JRZ-5 is housed in an 8-lead SOIC_N (R-8) package with standard 1.27 mm pitch, RoHS-compliant, and rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CC) | Low-Z Input / Coupling Capacitor Node | Accepts RMS input via 8 kΩ internal resistor; also serves as ac-coupling point for indirect dc coupling to Pin 2 |
| 2 (VIN) | High-Z RMS Input | FET-gated input with 10¹² Ω impedance and 25 pA bias current - ideal for passive probes and high-resistance dividers |
| 3 (POWER DOWN) | Enable/Disable Control | Active-low enable: grounded = active; pulled high = 25 µA standby mode - enables automatic power gating |
| 4 (–VS) | Negative Supply Rail | Connects to –2.5 V rail; supports symmetric ±2.5 V operation essential for bipolar signal handling |
| 5 (CAV) | Averaging Capacitor Terminal | Connects external capacitor (e.g., 33 µF) to implement RMS computation time constant - no trimming required |
| 6 (OUTPUT) | Negative-Going DC Output | Unbuffered output voltage proportional to input RMS value - requires high-Z load (e.g., >1 MΩ ADC input) |
| 7 (+VS) | Positive Supply Rail | Connects to +2.5 V rail; combined with Pin 4, defines operating voltage window per J-5 grade spec |
| 8 (COM) | Analog Ground Reference | Common return for input, output, and supply - must be star-connected to minimize ground loop errors |
Key Features
| Feature | Design Value |
|---|---|
| True RMS + Average + Absolute Modes | Single IC supports three distinct measurement functions via external capacitor configuration - reduces BOM count in multi-mode instruments |
| No External Trims Required | Laser-trimmed at wafer level for ±0.2 mV ± 0.3% accuracy - eliminates field calibration labor and potentiometer drift in production test fixtures |
| Direct 3½-Digit ADC Interface | Output drives CMOS ADCs directly without buffer amplifier - avoids added offset, noise, and power consumption of external op amps |
| Ultra-Low Standby Power | 25 µA in power-down mode - enables microcontroller-gated measurement cycles in energy-harvesting or coin-cell devices |
| Wide Crest Factor Tolerance | Maintains <1% additional error up to crest factor 5 with proper CAV selection - supports accurate measurement of triac-dimmed lighting and motor phase control waveforms |
Applications
| Portable Digital Multimeters | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Handheld DMM measuring AC mains voltage, motor current, or distorted waveforms in field service. IC Role / Device Role / Timing Role: True RMS conversion engine delivering calibrated DC output to 3½-digit ADC - replaces legacy average-responding circuits with 11% sine-wave error. Use Value: Delivers ±0.3% reading accuracy across crest factors 1–5 without recalibration, enabling Class II meter compliance per IEC 61010. | Use Scenario: Remote environmental sensor node logging AC-coupled vibration or audio-level RMS over weeks on AA batteries. IC Role / Device Role / Timing Role: Low-power RMS front-end that powers down between samples - synchronized to microcontroller wake-up timer. Use Value: 25 µA standby current extends battery life >2 years at 1-sample-per-minute duty cycle, while maintaining 100 µV rms sensitivity. |
| Industrial SCR-Controlled Power Monitoring | Audio Signal Level Detection |
Use Scenario: Panel-mounted power analyzer monitoring phase-angle-controlled heating elements in industrial ovens. IC Role / Device Role / Timing Role: High-crest-factor RMS detector for 50/60 Hz SCR waveforms with 25%–75% duty cycle - connected to Pin 1 with CAV = 100 µF. Use Value: Achieves ≤2.5% additional error at crest factor 5, enabling accurate thermal load estimation despite waveform distortion. | Use Scenario: Studio-grade audio compressor detecting program-dependent RMS level of speech or music signals. IC Role / Device Role / Timing Role: Fast-settling RMS detector (CAV = 1.5 µF, CF = 0.5 µF) driving envelope follower circuit - optimized for 300 Hz low-frequency cutoff. Use Value: 18 ms settling time to 1% at 200 mV rms input enables real-time vocal dynamics tracking without lag or 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 | Positive-going output polarity; same ±2.5 V supply capability; identical accuracy and input specs - but not pin-compatible (Pin 6 output polarity reversed) | Used where downstream ADC or display expects positive output voltage without inversion stage | Select AD736JRZ only when system-level polarity alignment eliminates need for external inverting op amp. |
| MAX4206ESA+ | Single-supply operation (2.7–5.5 V); integrated output buffer; higher 350 µA supply current; ±0.5% accuracy (typical) - no ±2.5 V specific grade | Preferred in space-constrained, single-rail systems (e.g., USB-powered analyzers) where ± supply generation is undesirable | Choose MAX4206ESA+ when board lacks dual supplies and layout cannot accommodate discrete inverter + buffer. |
Compared with AD737JRZ-5, AD736JRZ offers polarity convenience at the cost of requiring PCB redesign for pin 6 routing, while MAX4206ESA+ trades metrology-grade accuracy and ultra-low standby power for single-supply simplicity and integrated drive capability - making AD737JRZ-5 optimal for dual-supply, battery-sensitive, high-accuracy portable instrumentation.
Availability
AD737JRZ-5 is available at Aetrix Electronics and suitable for portable multimeters, battery-powered data loggers, industrial SCR power monitors, and audio level detectors requiring stable component supply and long-term obsolescence management.
Supply support for AD737JRZ-5 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, founded in 1965 and headquartered in Wilmington, MA.
The AD737 belongs to Analog Devices' precision signal conditioning product line, designed specifically for metrology-grade AC measurement in portable, low-power, and industrial instrumentation where waveform-agnostic RMS accuracy is mandatory.
FAQ
What is the supply voltage range validated for AD737JRZ-5?
The AD737JRZ-5 is specifically tested and characterized at ±2.5 V dual supply, as indicated by the "-5" suffix in its part number. While the base AD737 family supports ±2.5 V to ±16.5 V, the JRZ-5 variant guarantees performance - including accuracy, bandwidth, and power consumption - only under ±2.5 V conditions per Rev. K datasheet Table 1.
Why does AD737JRZ-5 have a negative-going output?
The AD737JRZ-5 output is inherently negative-going due to its internal RMS core topology and unbuffered output stage. This design minimizes DC offset errors and preserves compatibility with high-input-impedance CMOS ADCs. To interface with positive-input ADCs, an external inverting op amp or level-shifting circuit (e.g., AD8541 in Figure 28) is required - a trade-off for metrological purity.
How many external components does AD737JRZ-5 require for basic true RMS operation?
The AD737JRZ-5 requires only one mandatory external component for true RMS operation: the averaging capacitor (CAV) connected to Pin 5. Typical values range from 3.3 µF to 150 µF depending on input frequency and crest factor. Additional capacitors (CC for ac coupling, CF for ripple reduction) are optional and application-dependent - no resistors or trims are needed for specified accuracy.
Can AD737JRZ-5 measure DC signals, and how is DC coupling implemented?
Yes, the AD737JRZ-5 measures both AC and DC input voltages. For DC coupling, apply the signal directly to Pin 2 (high-Z) or Pin 1 (low-Z), with COM (Pin 8) as reference. AC coupling is achieved by inserting a capacitor between source and Pin 2 (or Pin 1), leveraging the internal FET input's ultra-low bias current (25 pA max) to prevent signal droop - enabling stable sub-mV RMS measurements over temperature.
What is the maximum crest factor AD737JRZ-5 supports with guaranteed accuracy?
The AD737JRZ-5 maintains ≤2.5% additional error for crest factors up to 5 when used with CAV = 100 µF, as confirmed in Table 1 and Figure 10 of the Rev. K datasheet. This capability is critical for measuring phase-controlled waveforms (e.g., triac-dimmed lighting, SCR motor drives) where peak-to-RMS ratios exceed 3 - distinguishing it from average-responding converters that fail catastrophically above crest factor 2.
AD737JRZ-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Current - Supply:
- 170 µA
- Voltage - Supply:
- 2.8V, -3.2V ~ ±16.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD737JRZ-5 FAQ
1.How can I place an order for AD737JRZ-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD737JRZ-5 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 AD737JRZ-5 reliable?
The price and inventory of AD737JRZ-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD737JRZ-5 is usually 5 days.
3.What payment methods are accepted for AD737JRZ-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD737JRZ-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD737JRZ-5?
AD737JRZ-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD737JRZ-5 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 AD737JRZ-5?
For technical support, including AD737JRZ-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD737JRZ-5 requirements.
6.How does Aetrix verify that AD737JRZ-5 is sourced from the original manufacturer or authorized distributors?
All AD737JRZ-5 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 AD737JRZ-5 meets industry standards.
7.What is the process for return or replacement of AD737JRZ-5?
All AD737JRZ-5 units undergo pre-shipment inspection (PSI). If there is an issue with AD737JRZ-5, 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 AD737JRZ-5 part is unused and in its original packaging.
Return procedure for AD737JRZ-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD737JRZ-5 Tags
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