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Analog Devices Inc. AD7701ARS-REEL
- Part No.:
- AD7701ARS-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7701ARS-REEL.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,776
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Product details
Overview
AD7701ARS-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 programmable low-pass filter corner frequency (0.1 Hz to 10 Hz). It supports unipolar (0 V to +2.5 V) or bipolar (±2.5 V) input ranges, delivers 4 kSPS output data rate, and achieves ±0.0015% FSR integral nonlinearity - optimized for precision low-frequency measurement in industrial process control and portable instrumentation.
For engineers reviewing the AD7701ARS-REEL datasheet, AD7701ARS-REEL pinout, AD7701ARS-REEL application, or AD7701ARS-REEL equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SSOP-28 package mapping, confirmed pin functions per Analog Devices Rev. E documentation, and two rigorously cross-checked alternative parts with documented functional and application differences.
Technical Context
The AD7701ARS-REEL employs a second-order sigma-delta modulator with charge-balancing architecture and an on-chip six-pole Gaussian digital filter that provides 55 dB rejection at 60 Hz when configured for 10 Hz corner frequency. Its master clock (CLKIN) determines all timing parameters: sampling frequency = fCLKIN/256, output update rate = fCLKIN/1024, and filter cutoff = fCLKIN/409,600.
It supports three serial interface modes via the MODE pin: asynchronous UART-compatible (AC), synchronous external clocking (SEC), and synchronous self-clocking (SSC) where SCLK outputs fCLKIN/4. Calibration is initiated by pulsing CAL high for >4 cycles, enabling zero/full-scale self-calibration or system-level offset/gain correction using SC1/SC2 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonicity and no missing codes across full dynamic range. |
| Integral Nonlinearity | ±0.0015% FSR max - ensures endpoint accuracy without external trimming. |
| Input Range | Unipolar: 0 V to +2.5 V; Bipolar: ±2.5 V - selectable via BP/UP pin, referenced to 2.5 V VREF. |
| Output Data Rate | 4 kSPS at fCLKIN = 4.096 MHz - fixed ratio to master clock enables deterministic timing. |
| Power Consumption | 25 mW typical active; 10 µW standby - enables loop-powered remote sensing and battery operation. |
| Digital Filter | 6-pole Gaussian response - delivers 55 dB 60 Hz rejection at 10 Hz corner, eliminating need for external notch filters. |
| Calibration | On-chip self-calibration of zero and full scale - removes temperature drift effects and supports system-level calibration. |
Pinout & Package
AD7701ARS-REEL is housed in a 28-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, RoHS-compliant, moisture sensitivity level 3. Pin numbering follows standard SSOP top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE (Pin 1) | Serial interface mode select | Configures AC/SEC/SSC protocol; determines SCLK direction and data framing. |
| CLKIN (Pin 3) | Master clock input | Sets all internal timing: sampling, filtering, and output update rates via fixed ratios. |
| AIN (Pin 9) | Analog input | High-impedance (1 nA bias), 10 pF input capacitance; accepts unipolar or bipolar signals. |
| VREF (Pin 10) | Reference voltage input | 2.5 V nominal reference defining full-scale range; must be stable and low-noise. |
| BP/UP (Pin 12) | Bipolar/unipolar mode control | Logic high = ±2.5 V range; logic low = 0 V to +2.5 V range - configures transfer function. |
| CAL (Pin 13) | Calibration trigger | Pulse high ≥4 CLKIN cycles to initiate self-calibration or system calibration sequence. |
| SLEEP (Pin 11) | Power-down control | Logic low reduces power to 10 µW; critical for battery life in portable instruments. |
| DRDY (Pin 18) | Data ready indicator | Active-low flag signaling valid data in output register; synchronizes host read operations. |
| CS (Pin 16) | Chip select | Enables serial data transmission; falling edge initiates output of 16-bit word. |
| SDATA (Pin 20) | Serial data output | MSB-first 16-bit word; format depends on MODE setting (AC/SEC/SSC). |
Key Features
| Feature | Design Value |
|---|---|
| On-chip self-calibration | Removes zero and full-scale errors over temperature; supports system-level calibration including sensor and signal conditioning offsets. |
| Programmable digital filter | Corner frequency adjustable from 0.1 Hz to 10 Hz via CLKIN; eliminates need for external analog anti-aliasing filters in DC–10 Hz applications. |
| No missing codes | Guaranteed monotonic 16-bit transfer function - avoids data gaps requiring software interpolation or gain staging. |
| Flexible serial interface | Three modes (AC/SEC/SSC) enable direct connection to UARTs, microcontroller SPI ports, or shift registers without glue logic. |
| Ultralow standby power | 10 µW consumption in SLEEP mode - extends battery life in handheld test equipment and remote sensors. |
Applications
| Industrial Process Control | Weigh Scales |
|---|---|
Use Scenario: Monitoring slow-varying pressure, temperature, or flow signals in PLC-based control cabinets with 4–20 mA loop interfaces. IC Role / Device Role / Timing Role: Primary ADC converting conditioned analog sensor outputs into calibrated 16-bit digital values for PID computation. Use Value: 0.0015% linearity and on-chip self-calibration maintain measurement accuracy over wide temperature ranges without field recalibration. |
Use Scenario: High-resolution weight measurement in platform scales using strain gauge bridges with mV/V outputs. IC Role / Device Role / Timing Role: Precision front-end digitizer with programmable 0.1–10 Hz filter to reject 50/60 Hz mains interference and mechanical vibration noise. Use Value: 6-pole Gaussian filter delivers >55 dB 60 Hz rejection at 10 Hz bandwidth, enabling stable readings without external notch filters. |
| Portable Instrumentation | Remote Data Acquisition |
Use Scenario: Battery-powered handheld multimeters or environmental monitors measuring DC voltage, current, or thermocouple outputs. IC Role / Device Role / Timing Role: Low-power ADC with SLEEP mode and flexible serial interface for MCU-controlled data logging. Use Value: 10 µW standby power and 25 mW active dissipation extend single-cell Li-ion battery life to >12 months in sleep-dominated duty cycles. |
Use Scenario: Solar-powered remote nodes collecting soil moisture, water level, or air quality data over weeks between transmissions. IC Role / Device Role / Timing Role: System-on-module ADC interfacing to low-power microcontrollers and RF transceivers in energy-constrained edge devices. Use Value: Self-calibration maintains long-term stability without maintenance visits; unipolar/bipolar mode flexibility supports diverse sensor types. |
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 SLEEP pin, 10 Hz filter only. | Designed for multi-sensor systems requiring channel multiplexing; lacks ultralow-power standby mode. | Select AD7705BRUZ when multiple analog inputs are needed and power budget allows >1 mW active draw. |
| ADS124S08IPWR | 24-bit, 4-channel, integrated PGA, 2.1 mW active, 0.0015% INL, SPI interface, no self-calibration pin. | Targets higher resolution and channel density; relies on internal auto-calibration rather than user-triggered CAL pin. | Select ADS124S08IPWR when 24-bit resolution and programmable gain are required, and system-level calibration is managed in firmware. |
Compared with AD7705BRUZ and ADS124S08IPWR, the AD7701ARS-REEL uniquely combines user-initiated self-calibration, dedicated SLEEP control for sub-10 µW standby, and SSOP-28 packaging suited for space-constrained industrial PCBs - making it optimal for single-channel, ultra-low-power, calibration-critical applications.
Availability
AD7701ARS-REEL is available at Aetrix Electronics and suitable for industrial process control, weigh scales, portable instrumentation, and remote data acquisition requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for AD7701ARS-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 AD7701ARS-REEL?
The AD7701ARS-REEL supports a master clock (CLKIN) frequency 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 digital filter corner. Operation down to 200 kHz is guaranteed, enabling ultra-low-power configurations with reduced throughput.
How does the AD7701ARS-REEL handle input overvoltage conditions?
The AD7701ARS-REEL provides ±100 mV of overrange headroom beyond its specified input range (e.g., up to +2.6 V in unipolar mode). This protects the sigma-delta modulator and digital filter from saturation due to noise peaks or transient excursions. Exceeding this limit risks invalid conversion results or temporary loss of calibration integrity.
Can the AD7701ARS-REEL operate with a single supply?
No - the AD7701ARS-REEL requires dual ±5 V analog supplies (AVDD = +5 V, AVSS = –5 V) and separate +5 V/–5 V digital supplies (DVDD/DVSS). The datasheet specifies absolute maximum ratings and operational limits assuming split supplies; single-supply operation is not supported and violates absolute maximum ratings.
What is the purpose of the SC1 and SC2 pins on the AD7701ARS-REEL?
The SC1 and SC2 pins determine calibration type when CAL is asserted: they configure zero-scale, full-scale, or system-level calibration modes. During system calibration, external circuitry (e.g., sensor front-end) can be included in the loop to null offset and gain errors - a capability unique to the AD7701ARS-REEL among its generation of sigma-delta converters.
Does the AD7701ARS-REEL require an external crystal?
No - the AD7701ARS-REEL includes an on-chip clock oscillator; a crystal may be connected between CLKOUT and CLKIN for improved stability, but an external clock source (e.g., CMOS oscillator) or the internal oscillator driven by CLKIN alone is sufficient. Crystal use is optional and application-dependent.
AD7701ARS-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:
- Obsolete
- 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:
- -
AD7701ARS-REEL FAQ
1.How can I place an order for AD7701ARS-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7701ARS-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 AD7701ARS-REEL reliable?
The price and inventory of AD7701ARS-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7701ARS-REEL is usually 5 days.
3.What payment methods are accepted for AD7701ARS-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7701ARS-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7701ARS-REEL?
AD7701ARS-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7701ARS-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 AD7701ARS-REEL?
For technical support, including AD7701ARS-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7701ARS-REEL requirements.
6.How does Aetrix verify that AD7701ARS-REEL is sourced from the original manufacturer or authorized distributors?
All AD7701ARS-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 AD7701ARS-REEL meets industry standards.
7.What is the process for return or replacement of AD7701ARS-REEL?
All AD7701ARS-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7701ARS-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 AD7701ARS-REEL part is unused and in its original packaging.
Return procedure for AD7701ARS-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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