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Analog Devices Inc. AD7701ARSZ-REEL
- Part No.:
- AD7701ARSZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7701ARSZ-REEL.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,854
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Product details
Overview
AD7701ARSZ-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 supports unipolar (0 V to +2.5 V) or bipolar (±2.5 V) input ranges. It is used in high-accuracy, low-frequency measurement systems such as industrial weigh scales and remote data acquisition nodes.
For engineers reviewing the AD7701ARSZ-REEL datasheet, AD7701ARSZ-REEL pinout, AD7701ARSZ-REEL application, or AD7701ARSZ-REEL equivalent, key selection considerations include its programmable 0.1 Hz–10 Hz low-pass filter corner frequency, ultralow 10 µW standby power, ±0.0015% FSR integral nonlinearity, and support for asynchronous UART or synchronous microcontroller interfacing via MODE-selectable serial protocols.
Technical Context
The AD7701ARSZ-REEL employs a second-order sigma-delta modulator with charge-balancing architecture, continuously sampling at up to 16 kHz and feeding a deterministic six-pole Gaussian digital filter that updates the 16-bit output register at up to 4 kHz. Its master clock (CLKIN) directly determines output word rate (fCLKIN/1024), filter corner frequency (fCLKIN/409,600), and settling time (507904/fCLKIN seconds).
Calibration is performed via dedicated CAL, SC1, and SC2 pins, enabling zero/full-scale self-calibration or system-level offset/gain correction. The device supports three serial interface modes-Asynchronous Communications (AC), Synchronous External Clocking (SEC), and Synchronous Self-Clocking (SSC)-each defining SCLK direction, framing, and timing behavior without external protocol translation logic.
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. |
| Integral Nonlinearity | ±0.0015% FSR max - enables high-precision DC measurements in process control transducers. |
| Output Data Rate | Up to 4 kSPS - matches typical update requirements of industrial PLC analog input modules. |
| Filter Corner Frequency | 0.1 Hz to 10 Hz (programmable via CLKIN) - provides >55 dB 60 Hz rejection at 10 Hz cutoff for AC mains noise suppression. |
| Power Consumption | 25 mW typical active, 10 µW standby - supports loop-powered 4–20 mA field instruments and battery-operated portable meters. |
| Analog Input Range | Unipolar: 0 V to +2.5 V; Bipolar: ±2.5 V - accommodates standard sensor outputs including strain gauge bridges and thermocouple signal conditioners. |
| Supply Voltages | AVDD/DVDD = +4.5 V to +5.5 V; AVSS/DVSS = –4.5 V to –5.5 V - supports dual-rail operation for true bipolar signal acquisition. |
Pinout & Package
AD7701ARSZ-REEL is housed in a 20-lead SOIC (Small Outline Integrated Circuit) package with gull-wing leads, RoHS-compliant, and rated for –40°C to +85°C operation. Pin 1 is marked by a beveled corner or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE (Pin 1) | Serial interface mode select | Determines SCLK I/O direction and data framing: –5 V = AC (UART-compatible), DGND = SEC (SCLK input), +5 V = SSC (SCLK output @ fCLKIN/4). |
| CLKIN (Pin 3) | Master clock input | Drives internal timing; sets output rate (fCLKIN/1024), filter cutoff (fCLKIN/409,600), and settling time - must be present outside SLEEP mode. |
| AIN (Pin 9) | Analog input | High-impedance (1 nA bias), 10 pF capacitive load - accepts differential or single-ended signals referenced to AGND within ±(VREF + 0.1 V). |
| VREF (Pin 10) | Reference voltage input | 2.5 V nominal reference defines full-scale range in both unipolar and bipolar modes; overrange tolerance ±100 mV prevents digital filter saturation. |
| BIP/UP (Pin 12) | Input range configuration | Logic low = unipolar (0 V to VREF); logic high = bipolar (±VREF) - configures transfer function and zero point before conversion. |
| CAL (Pin 13) | Calibration trigger | Pulse high ≥4 CLKIN cycles initiates zero/full-scale calibration; also serves as synchronization strobe for multi-device systems. |
| SLEEP (Pin 11) | Power-down control | Logic low places device in standby, reducing current to ~10 µW; wake-up requires CLKIN restart and recalibration if needed. |
| DRDY (Pin 18) | Data ready indicator | Active-low open-drain output signals valid data availability; pulses high for 4 CLKIN cycles during register reload to prevent read errors. |
| SDATA (Pin 20) | Serial data output | 16-bit MSB-first output; format and timing depend on MODE setting - no external shift register required for MCU interfacing. |
| CS (Pin 16) | Chip select enable | Active-low enables serial transmission; in SSC/SEC modes, CS low initiates immediate data output; in AC mode, controls byte framing. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip self-calibration | Removes zero and full-scale errors at power-up or on-demand; extends to system-level offset/gain correction when SC1/SC2 configure external loop inclusion. |
| Programmable Gaussian digital filter | 6-pole response with user-settable corner frequency (0.1–10 Hz) provides >55 dB 60 Hz rejection and eliminates need for external anti-aliasing filters. |
| No missing codes guarantee | Ensures monotonic 16-bit transfer function across full temperature range - critical for closed-loop control and precision weighing applications. |
| Ultralow-power standby mode | 10 µW consumption enables integration into energy-constrained designs like solar-powered remote sensors or handheld test equipment. |
| Flexible serial interface | Three MODE-selectable protocols eliminate level-shifting or protocol translation ICs - direct connection to UARTs, PIC/ARM SPI peripherals, or FPGA logic. |
Applications
| Industrial Process Control | Weigh Scales |
|---|---|
Use Scenario: Monitoring pressure, flow, or temperature in distributed PLC I/O modules with 4–20 mA loop integration. IC Role / Device Role / Timing Role: Primary ADC for conditioned sensor signals; performs continuous sigma-delta sampling and digital filtering before transmitting calibrated 16-bit words to host controller. Use Value: 0.0015% linearity and on-chip self-calibration maintain accuracy over temperature drift and long-term aging without field recalibration. | Use Scenario: High-resolution weight measurement in platform or hopper scales using strain-gauge bridge sensors. IC Role / Device Role / Timing Role: Front-end ADC capturing low-frequency bridge output; uses bipolar mode and programmable filter to reject mechanical vibration and 50/60 Hz interference. Use Value: Guaranteed no missing codes and 16-bit resolution enable sub-gram resolution in multi-kilogram capacity systems with minimal post-processing. |
| Portable Instrumentation | Remote Data Acquisition |
Use Scenario: Battery-powered handheld multimeters or environmental monitors requiring extended runtime and stable DC accuracy. IC Role / Device Role / Timing Role: Low-power ADC subsystem; enters SLEEP mode between readings to minimize quiescent current while retaining calibration memory. Use Value: 10 µW standby power and 2.7 mA analog supply current allow >1-year operation on AA batteries in intermittent-read configurations. | Use Scenario: Unmanned telemetry nodes deployed in oil/gas pipelines or water distribution networks. IC Role / Device Role / Timing Role: Signal digitizer interfaced to RF modem; converts slow-varying sensor outputs (e.g., corrosion potential, pH) into packetized 16-bit values. Use Value: Dual-supply ±5 V operation and robust ESD protection (4 kV HBM) ensure reliability in harsh, electrically noisy field environments. |
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 |
|---|---|---|---|
| AD7705BRUZ | 2-channel, 16-bit, SPI-compatible, 1 mW active power, no bipolar mode - requires external reference and lacks SLEEP pin. | Best for space-constrained multi-sensor systems needing channel multiplexing; unsuitable for true bipolar inputs or ultra-low-power sleep. | Select AD7705BRUZ only when dual-channel acquisition is required and bipolar input range is not needed. |
| ADS1256IPWR | 24-bit, 30 kSPS, integrated PGA, SPI interface, 1.2 mW active - higher resolution but no self-calibration circuitry or programmable filter shape. | Preferred for high-dynamic-range applications like medical instrumentation; requires external calibration and analog antialiasing. | Choose ADS1256IPWR when 24-bit resolution outweighs need for on-chip calibration and filter flexibility. |
Compared with AD7705BRUZ and ADS1256IPWR, the AD7701ARSZ-REEL uniquely combines self-calibration, programmable Gaussian filtering, bipolar/unipolar configurability, and 10 µW standby power in a single SOIC package - making it optimal for cost-sensitive, low-power, high-accuracy industrial sensing where system-level calibration simplicity is critical.
Availability
AD7701ARSZ-REEL is available at Aetrix Electronics and suitable for industrial process control, weigh scale design, and portable instrumentation requiring stable component supply, long-lifecycle support, and traceable dual-supply ADC sourcing.
Supply support for AD7701ARSZ-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 AD7701ARSZ-REEL 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 industrial and instrumentation applications.
FAQ
What is the maximum clock frequency supported by the AD7701ARSZ-REEL?
The AD7701ARSZ-REEL supports a master clock (CLKIN) frequency of up to 5 MHz, with production testing performed at 4.096 MHz. At this frequency, the device achieves a 4 kSPS output data rate and 10 Hz filter corner frequency. Operation down to 200 kHz is guaranteed, enabling ultra-low-power configurations with reduced throughput.
Does the AD7701ARSZ-REEL require an external voltage reference?
No, the AD7701ARSZ-REEL does not require an external voltage reference - it accepts an externally supplied 2.5 V reference at the VREF pin, which defines its full-scale range. The device itself contains no internal reference; VREF must be provided with sufficient stability and low noise (e.g., ADR3425 or REF192) to maintain specified linearity and accuracy.
Can the AD7701ARSZ-REEL operate with a single supply?
No, the AD7701ARSZ-REEL requires dual analog supplies (AVDD = +5 V, AVSS = –5 V) and dual digital supplies (DVDD = +5 V, DVSS = –5 V) to support its bipolar input range and internal charge-balancing modulator. Single-supply operation is not supported - attempting to tie AVSS/DVSS to ground violates absolute maximum ratings and will damage the device.
How does the AD7701ARSZ-REEL handle input overvoltage conditions?
The AD7701ARSZ-REEL provides ±100 mV overrange headroom beyond VREF in both unipolar and bipolar modes. Inputs exceeding this range may saturate the sigma-delta modulator or overflow the digital filter, resulting in invalid output codes (all 0s or all 1s). For larger transient suppression, external clamping or RC filtering is recommended prior to the AIN pin.
Is the AD7701ARSZ-REEL pin-compatible with other devices in the AD77xx family?
No, the AD7701ARSZ-REEL is not pin-compatible with other AD77xx-series converters such as AD7705 or AD7714. Its 20-pin SOIC layout, dual-supply requirement, and unique pin functions (e.g., BP/UP, SLEEP, SC1/SC2) differ significantly. Migration requires PCB redesign and firmware adaptation due to distinct serial interface timing and calibration control schemes.
AD7701ARSZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm 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:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7701ARSZ-REEL FAQ
1.How can I place an order for AD7701ARSZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7701ARSZ-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 AD7701ARSZ-REEL reliable?
The price and inventory of AD7701ARSZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7701ARSZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7701ARSZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7701ARSZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7701ARSZ-REEL?
AD7701ARSZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7701ARSZ-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 AD7701ARSZ-REEL?
For technical support, including AD7701ARSZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7701ARSZ-REEL requirements.
6.How does Aetrix verify that AD7701ARSZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7701ARSZ-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 AD7701ARSZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7701ARSZ-REEL?
All AD7701ARSZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7701ARSZ-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 AD7701ARSZ-REEL part is unused and in its original packaging.
Return procedure for AD7701ARSZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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