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Analog Devices Inc. AD7701ARZ
- Part No.:
- AD7701ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7701ARZ.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:237
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Product details
Overview
AD7701ARZ 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 datasheet, AD7701ARZ pinout, AD7701ARZ application, or AD7701ARZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for long-lifecycle embedded instrumentation designs.
Technical Context
The AD7701ARZ employs a second-order sigma-delta modulator with charge-balancing architecture, continuously sampling at up to 16 kHz (fCLKIN/256) and feeding a six-pole Gaussian digital filter that produces 16-bit words at up to 4 kHz. Its internal clock generator supports crystal or external master clock (200 kHz–5 MHz), and filter corner frequency is programmable from 0.1 Hz to 10 Hz via fCLKIN/409,600.
It features three serial interface modes-Asynchronous Communications (AC), Synchronous External Clocking (SEC), and Synchronous Self-Clocking (SSC)-each defining SCLK direction, data framing, and timing behavior. Calibration is initiated via the CAL pin and includes zero/full-scale self-calibration, with optional system-level offset/gain correction using SC1/SC2 pins.
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-switching circuitry. |
| Linearity Error | ±0.0015% FSR max - enables accurate end-point measurement in precision weighing and process control transducers. |
| Analog Input Range | 0 V to +2.5 V (unipolar) or ±2.5 V (bipolar) - matches standard 2.5 V reference ICs and simplifies sensor signal conditioning. |
| Output Data Rate | Up to 4 kSPS - supports real-time monitoring of slow-varying physical parameters (e.g., temperature, pressure, strain) without oversampling burden. |
| Power Consumption | 25 mW typical normal operation; 10 µW standby - suitable for loop-powered 4–20 mA transmitters and battery-operated portable instruments. |
| Digital Filter | 6-pole Gaussian response, f–3 dB = fCLKIN/409,600 - delivers >55 dB rejection at 60 Hz with 10 Hz cutoff, eliminating need for external notch filters. |
| Calibration Capability | On-chip self-calibration of zero and full scale, plus system calibration mode - removes drift-induced errors and allows correction of front-end amplifier offset/gain. |
Pinout & Package
AD7701ARZ is packaged in a 20-lead SOIC (R-20) with exposed pad (RoHS-compliant, Pb-free). Pin assignments are identical to AD7701AR and fully compatible with PDIP/CERDIP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE | Serial interface mode select | Configures AC/SEC/SSC protocol; determines SCLK I/O direction and data framing - critical for MCU UART or SPI compatibility. |
| 5 DGND | Digital ground reference | Separate from AGND to minimize digital noise coupling into analog path - requires star grounding at single-point connection. |
| 8 AGND | Analog ground reference | Reference for AIN, VREF, AVSS/AVDD - must be isolated from DGND except at single tie-point near power supply decoupling. |
| 9 AIN | Analog input terminal | High-impedance (1 nA bias), 10 pF input capacitance - demands low-source-impedance signal conditioning (<1 kΩ) to avoid settling errors. |
| 10 VREF | Voltage reference input | 2.5 V nominal reference sets full-scale range; rejects supply noise >70 dB - must be decoupled with 0.1 µF ceramic + 10 µF tantalum. |
| 11 SLEEP | Low-power mode control | Logic low reduces idle current to 10 µW - enables duty-cycled sensing in energy-constrained remote nodes. |
| 12 BP/UP | Input range configuration | High = ±2.5 V bipolar mode; low = 0–2.5 V unipolar - selects transfer function without reprogramming or external resistors. |
| 13 CAL | Calibration trigger | Pulse >4 CLKIN cycles initiates zero/full-scale calibration - synchronizes multiple AD7701ARZ devices in distributed sensor arrays. |
| 14 AVDD | Analog positive supply | +4.5 V to +5.5 V - powers modulator and analog front-end; requires dedicated 0.1 µF + 10 µF decoupling. |
| 15 DVDD | Digital positive supply | +4.5 V to AVDD - powers serial interface logic; shares ground with DGND but must be filtered separately from AVDD. |
| 16 CS | Chip select enable | Active-low enables serial data transmission; controls SDATA/SCLK bus release timing - essential for multi-device daisy-chaining. |
| 18 DRDY | Data ready indicator | Active-low flag signals valid 16-bit word in output register - eliminates polling overhead and enables interrupt-driven firmware. |
| 19 SCLK | Serial clock I/O | Direction and frequency depend on MODE setting; in SSC mode outputs fCLKIN/4 with 25% duty cycle - drives microcontroller SPI peripheral directly. |
| 20 SDATA | Serial data output | MSB-first 16-bit word; format varies by MODE - supports UART framing (AC), raw SPI (SEC), or self-clocked streaming (SSC). |
Key Features
| Feature | Design Value |
|---|---|
| On-chip self-calibration | Removes zero and full-scale drift over temperature (±1.2 LSB typ full-scale drift) without external calibration hardware. |
| Programmable low-pass filter | Corner frequency set from 0.1 Hz to 10 Hz via master clock - enables configurable noise rejection for varying sensor bandwidths. |
| No missing codes guarantee | Ensures monotonic 16-bit transfer function across full operating range - eliminates need for software correction or gain staging. |
| Ultralow standby power | 10 µW consumption in SLEEP mode - extends battery life in portable instrumentation and enables always-on wake-up capability. |
| Flexible serial interface | Three modes (AC/SEC/SSC) support direct connection to UARTs, microcontroller SPI ports, or shift-register-based controllers - reduces BOM count and layout complexity. |
Applications
| Industrial Process Control | Weigh Scales |
|---|---|
|
Use Scenario: Monitoring pressure, flow, or level in chemical plant PLC I/O modules with 4–20 mA loop integration. IC Role / Device Role / Timing Role: Primary ADC for isolated analog sensor inputs; performs continuous 4 kSPS conversion with built-in 60 Hz rejection. Use Value: Eliminates external anti-aliasing filters and calibration DACs, reducing component count and improving long-term stability under thermal cycling. |
Use Scenario: High-resolution load cell readout in platform scales and hopper dosing systems requiring <0.002% accuracy. IC Role / Device Role / Timing Role: Precision sigma-delta converter with on-chip self-calibration - corrects sensor offset/gain drift during warm-up and ambient shifts. Use Value: Achieves true 16-bit effective resolution without programmable gain amplifiers, enabling direct interface to mV/V bridge sensors. |
| Portable Instrumentation | Remote Data Acquisition |
|
Use Scenario: Battery-powered handheld multimeters and environmental monitors measuring temperature, humidity, or gas concentration. IC Role / Device Role / Timing Role: Low-power ADC with 10 µW standby mode and flexible serial interface - enables sleep-wake cycles synchronized to sensor sampling intervals. Use Value: Extends single-cell Li-ion battery life beyond 12 months in intermittent-read applications while maintaining 16-bit fidelity. |
Use Scenario: Wireless sensor nodes deployed in oil field telemetry or agricultural soil moisture networks. IC Role / Device Role / Timing Role: Standalone ADC with system calibration support - allows field recalibration against known reference voltages to compensate for aging front-end components. Use Value: Maintains traceable measurement accuracy over 10+ year deployments without factory return, reducing maintenance cost and downtime. |
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-only interface; no SLEEP pin; 1 mW typical power; 0.003% linearity. | Designed for multi-sensor systems needing channel multiplexing; lacks ultralow-power standby mode. | Select when dual-input capability and SPI simplicity outweigh need for sub-100 µW sleep power. |
| ADS124S08IPWR | 24-bit, 4-channel, integrated PGA and reference; 1.8–3.6 V supply; 2.5 mW active power; 0.0005% linearity. | Targets ultra-high-precision applications (e.g., medical diagnostics); requires external clock and has no self-calibration trigger pin. | Select when resolution >16-bit and integrated PGA eliminate external signal conditioning, accepting higher power and no CAL pin. |
Compared with AD7701ARZ, AD7705BRUZ offers channel flexibility but sacrifices standby efficiency and calibration control, while ADS124S08IPWR delivers superior resolution and integration at the cost of power budget and direct self-calibration accessibility - making AD7701ARZ optimal for cost-sensitive, low-power, single-channel industrial measurement where proven 16-bit stability is sufficient.
Availability
AD7701ARZ is available at Aetrix Electronics and suitable for industrial process control, weigh scales, and portable instrumentation requiring stable component supply across extended product lifecycles.
Supply support for AD7701ARZ 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 AD7701 belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for low-frequency, high-accuracy measurement of physical, chemical, and biological signals in harsh industrial environments.
FAQ
What is the maximum master clock frequency supported by the AD7701ARZ?
The AD7701ARZ 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, enabling ultra-low-power configurations with reduced throughput.
Does the AD7701ARZ require an external voltage reference?
Yes, the AD7701ARZ requires an external precision voltage reference applied to the VREF pin. It is specified for a 2.5 V nominal reference, which defines the full-scale range in both unipolar (0 V to +2.5 V) and bipolar (±2.5 V) modes. The device does not include an internal reference, and reference stability directly impacts absolute accuracy.
How does the SLEEP pin reduce power consumption in the AD7701ARZ?
The SLEEP pin, when driven low, places the AD7701ARZ into standby mode with typical power consumption of 10 µW. In this state, the analog modulator and digital filter halt, CLKIN is ignored, and all outputs enter high-impedance. Valid conversion resumes within microseconds after SLEEP returns high and CLKIN stabilizes - ideal for duty-cycled sensor systems.
Can the AD7701ARZ perform system-level calibration of external front-end components?
Yes, the AD7701ARZ supports system calibration via SC1 and SC2 pins. When CAL is asserted, specific combinations of SC1/SC2 states initiate offset or full-scale calibration routines that include external circuitry - enabling correction of gain and offset errors introduced by op-amps, RTDs, or bridge sensors upstream of the AIN pin.
What are the supply voltage requirements for the AD7701ARZ?
The AD7701ARZ 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 exceeds 70 dB, but proper decoupling (0.1 µF ceramic + 10 µF bulk per supply) is mandatory for specified performance.
AD7701ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD7701ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7701ARZ 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 reliable?
The price and inventory of AD7701ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7701ARZ is usually 5 days.
3.What payment methods are accepted for AD7701ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7701ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7701ARZ?
AD7701ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7701ARZ 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?
For technical support, including AD7701ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7701ARZ requirements.
6.How does Aetrix verify that AD7701ARZ is sourced from the original manufacturer or authorized distributors?
All AD7701ARZ 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 meets industry standards.
7.What is the process for return or replacement of AD7701ARZ?
All AD7701ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7701ARZ, 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 part is unused and in its original packaging.
Return procedure for AD7701ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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