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Analog Devices Inc. AD7701ARZ-REEL
- Part No.:
- AD7701ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7701ARZ-REEL.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,933
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Product details
Overview
AD7701ARZ-REEL from Analog Devices is a monolithic 16-bit sigma-delta analog-to-digital converter with on-chip 6-pole Gaussian digital filtering, self-calibration circuitry, and flexible serial interface. It delivers 0.0015% linearity error, 4 kSPS output data rate, and 0 V to +2.5 V or ±2.5 V analog input range. It is used in high-accuracy, low-frequency measurement systems such as industrial weigh scales and remote data acquisition nodes.
For engineers reviewing the AD7701ARZ-REEL datasheet, AD7701ARZ-REEL pinout, AD7701ARZ-REEL application, or AD7701ARZ-REEL equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts, and supply-chain support for production deployment.
Technical Context
The AD7701ARZ-REEL employs a second-order sigma-delta modulator with charge-balancing architecture and an integrated six-pole Gaussian digital filter that achieves 55 dB rejection at 60 Hz when configured for 10 Hz corner frequency. Its master clock (CLKIN) directly determines sampling rate (fS = fCLKIN/256), output update rate (fOUT = fCLKIN/1024), and filter cutoff (f–3 dB = fCLKIN/409,600).
It supports three serial interface modes-Asynchronous Communications (AC), Synchronous External Clocking (SEC), and Synchronous Self-Clocking (SSC)-controlled by the MODE pin, and features system-level calibration via SC1/SC2 pins synchronized by CAL. Power-down mode reduces idle consumption to 10 µW typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit binary output with guaranteed no missing codes - ensures full dynamic range usability without gain staging. |
| Linearity Error | ±0.0015% FSR max - enables accurate endpoint measurement in precision weighing and process control transducers. |
| Input Range | Unipolar: 0 V to +2.5 V; Bipolar: ±2.5 V - matches standard reference voltages and sensor bridge outputs. |
| Output Data Rate | Up to 4 kSPS - supports real-time monitoring of slow-varying physical parameters (e.g., temperature, pressure, strain). |
| Digital Filter | 6-pole Gaussian, f–3 dB = fCLKIN/409,600 - provides 55 dB 60 Hz rejection at 10 Hz bandwidth, eliminating mains interference. |
| Power Consumption | 25 mW typical active; 10 µW standby - suitable for loop-powered field instruments and battery-operated portable devices. |
| Calibration | On-chip self-calibration of zero and full-scale errors - removes drift-induced inaccuracies without external calibration hardware. |
Pinout & Package
AD7701ARZ-REEL is housed in a 20-lead SOIC (R-20) package with exposed pad (RoHS-compliant, lead-free). Pin numbering follows standard SOIC top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE (Pin 1) | Serial interface mode selector | Configures AC/SEC/SSC protocol; determines SCLK direction and data framing - critical for MCU UART or SPI compatibility. |
| AIN (Pin 9) | Analog input | High-impedance (1 nA bias), 10 pF input capacitance - accepts direct connection to low-output-impedance sensors or instrumentation amplifiers. |
| VREF (Pin 10) | Reference voltage input | 2.5 V nominal reference sets full-scale range; defines ±2.5 V bipolar or 0–2.5 V unipolar span - must be stable and low-noise. |
| BP/UP (Pin 12) | Bipolar/unipolar configuration | Logic level selects input range mode - enables single-device reuse across differential and single-ended sensor interfaces. |
| CAL (Pin 13) | Calibration trigger | Pulse >4 CLKIN cycles initiates on-chip zero/full-scale calibration - synchronizes multi-device systems and corrects system-level offset/gain drift. |
| SLEEP (Pin 11) | Power-down control | Active-low entry into 10 µW standby - essential for energy-constrained remote nodes requiring periodic wake-up and measurement. |
| DRDY (Pin 18) | Data ready indicator | Active-low flag signals valid data in output register - eliminates polling overhead and enables interrupt-driven firmware design. |
| SDATA (Pin 20) | Serial data output | 16-bit MSB-first serial word; format depends on MODE - interfaces directly to microcontroller SPI or UART peripherals. |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibration circuitry | Removes zero and full-scale errors at power-up or on-demand; extends calibration interval beyond 10 years in stable environments. |
| Programmable low-pass filter | Corner frequency adjustable from 0.1 Hz to 10 Hz via CLKIN - rejects 50/60 Hz noise while preserving signal integrity in EMI-prone industrial settings. |
| No missing codes | Guaranteed monotonic 16-bit transfer function - eliminates need for post-processing interpolation or gain correction in closed-loop control. |
| Flexible serial interface | Three modes (AC/SEC/SSC) support UART, shift-register, or microcontroller SPI - reduces BOM count and simplifies PCB routing. |
| Ultralow power standby | 10 µW typical consumption in SLEEP mode - enables >5-year battery life in wireless sensor nodes operating at 1-sample-per-minute duty cycle. |
Applications
| Industrial Process Control | Weigh Scales |
|---|---|
Use Scenario: Continuous monitoring of tank level, flow rate, or chemical concentration in PLC-connected field instruments. IC Role / Device Role / Timing Role: Primary ADC digitizing 4–20 mA loop signals conditioned by precision op-amps and reference buffers. Use Value: 0.0015% linearity and on-chip calibration ensure long-term accuracy without manual recalibration during maintenance windows. |
Use Scenario: High-resolution weight measurement in platform scales, hopper load cells, and batching systems. IC Role / Device Role / Timing Role: Sigma-delta ADC capturing low-frequency bridge outputs with 6-pole Gaussian filtering to suppress vibration-induced noise. Use Value: 16-bit no-missing-codes resolution and 55 dB 60 Hz rejection enable sub-gram repeatability under factory floor EMI. |
| Portable Instrumentation | Remote Data Acquisition |
Use Scenario: Handheld multimeters, environmental monitors, and battery-powered test equipment requiring high DC accuracy. IC Role / Device Role / Timing Role: Low-power ADC acquiring thermocouple, RTD, or pH sensor outputs with internal reference and calibration. Use Value: 10 µW standby mode and 25 mW active power allow >100 hours of operation on two AA cells at 10 SPS sampling. |
Use Scenario: Solar-powered telemetry nodes measuring soil moisture, water quality, or structural strain in unattended locations. IC Role / Device Role / Timing Role: Digitizer interfacing to low-noise front-end amplifiers and transmitting calibrated 16-bit samples over LoRaWAN or NB-IoT. Use Value: System-level calibration support (via SC1/SC2) compensates for PCB trace resistance and connector contact drift over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7714BRUZ | 24-bit resolution, 128-word FIFO, SPI-compatible only, higher power (1.2 mW active) | Targeted at higher-precision lab instrumentation; lacks asynchronous UART mode and sleep current <100 µW | Select AD7714BRUZ only if >16-bit resolution and FIFO buffering are required; not drop-in for AD7701ARZ-REEL layout or firmware. |
| ADS1256IPWR | 24-bit delta-sigma, 30 kSPS max, integrated PGA, I²C/SPI, 1.2 mW active | Designed for multi-channel sensor arrays; includes programmable gain but no self-calibration memory retention below 2.0 V | Choose ADS1256IPWR for multi-sensor systems needing on-chip PGA; AD7701ARZ-REEL remains preferred for ultra-low-power single-channel calibration-critical use. |
Compared with AD7714BRUZ and ADS1256IPWR, the AD7701ARZ-REEL uniquely combines 16-bit precision, sub-10 µW standby, on-chip calibration memory retention down to 2.0 V, and UART-compatible asynchronous serial mode - making it optimal for cost-sensitive, battery- or loop-powered single-channel measurement where long-term stability outweighs raw bit depth.
Availability
AD7701ARZ-REEL is available at Aetrix Electronics and suitable for industrial process control, weigh scale manufacturing, and portable instrumentation requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for AD7701ARZ-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 Norwood, MA.
The AD7701 belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for high-accuracy, low-frequency measurement of physical, chemical, and biological signals in harsh industrial and portable environments.
FAQ
What is the maximum clock frequency supported by the AD7701ARZ-REEL?
The AD7701ARZ-REEL supports a master clock (CLKIN) frequency up to 5 MHz, with production-tested operation at 4.096 MHz. At this frequency, the device achieves a 4 kSPS output data rate and 10 Hz digital filter corner frequency. Operation down to 200 kHz is guaranteed by characterization, enabling ultra-low-power configurations with reduced throughput.
Does the AD7701ARZ-REEL require an external crystal or can it operate with an external clock source?
The AD7701ARZ-REEL supports both external clock sources and crystal-based oscillation. When a crystal is connected between CLKOUT and CLKIN, the on-chip oscillator generates the master clock. If an external clock is supplied, CLKOUT is left unconnected. The device does not require a crystal - an external CMOS clock signal meeting timing specifications (200 kHz to 5 MHz, 20–80% duty cycle) is fully sufficient.
How does the AD7701ARZ-REEL handle system-level offset and gain calibration?
The AD7701ARZ-REEL supports system-level calibration through its SC1 and SC2 pins, which define calibration type when CAL is asserted. By including external signal conditioning components (e.g., front-end amplifier, resistor network) inside the calibration loop, the device nulls system offset and gain errors - not just internal ADC errors - improving end-to-end accuracy without additional calibration hardware.
What are the power supply requirements for the AD7701ARZ-REEL?
The AD7701ARZ-REEL requires dual ±5 V supplies: AVDD/DVDD = +4.5 V to +5.5 V and AVSS/DVSS = –4.5 V to –5.5 V. Digital and analog grounds (DGND/AGND) must be separated and joined at a single point. Supply rejection is 70 dB (positive) and 75 dB (negative) within the 0.1–10 Hz bandwidth, ensuring robust performance in noisy industrial power environments.
Can the AD7701ARZ-REEL interface directly with a microcontroller's UART peripheral?
Yes - when MODE is tied to –5 V, the AD7701ARZ-REEL enters Asynchronous Communications (AC) mode and outputs serial data with start/stop bits compatible with standard UARTs. In this mode, SDATA transmits two 8-bit bytes (MSB first), each with one start bit and two stop bits, eliminating the need for custom serial parsing logic in the host MCU.
AD7701ARZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 4k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7701ARZ-REEL FAQ
1.How can I place an order for AD7701ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7701ARZ-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 AD7701ARZ-REEL reliable?
The price and inventory of AD7701ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7701ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7701ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7701ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7701ARZ-REEL?
AD7701ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7701ARZ-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 AD7701ARZ-REEL?
For technical support, including AD7701ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7701ARZ-REEL requirements.
6.How does Aetrix verify that AD7701ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7701ARZ-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 AD7701ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7701ARZ-REEL?
All AD7701ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7701ARZ-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 AD7701ARZ-REEL part is unused and in its original packaging.
Return procedure for AD7701ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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