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Analog Devices Inc. AD7701ANZ
- Part No.:
- AD7701ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7701ANZ.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:133
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Product details
Overview
AD7701ANZ from Analog Devices is a monolithic 16-bit sigma-delta analog-to-digital converter with on-chip 6-pole Gaussian digital filtering, 0.0015% linearity error (B-grade), 4 kSPS output data rate, and programmable 0.1 Hz to 10 Hz low-pass filter corner frequency-designed for high-accuracy, low-frequency signal acquisition in industrial weigh scales and remote data acquisition systems.
For engineers reviewing the AD7701ANZ datasheet, AD7701ANZ pinout, AD7701ANZ application, or AD7701ANZ equivalent, this page delivers verified technical context, validated pin functions, real-world use-value per application, and two confirmed alternative parts with documented functional and packaging differences for precision sensor interface design.
Technical Context
The AD7701ANZ implements a second-order sigma-delta modulator with charge-balancing architecture, continuously sampling analog input at up to 16 kHz and processing output through an on-chip six-pole Gaussian digital filter that updates the 16-bit output register at up to 4 kHz. Its self-calibration microcontroller and SRAM store zero-scale and full-scale coefficients to eliminate system offset and gain errors.
It supports three serial interface modes-Asynchronous Communications (AC), Synchronous External Clocking (SEC), and Synchronous Self-Clocking (SSC)-with MODE pin selection, and features dual supply operation (±5 V analog, +5 V/–5 V digital) and ultralow 10 µW standby power via SLEEP pin control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit binary output with guaranteed no missing codes-ensures full dynamic range usability without external gain staging. |
| Linearity Error | ±0.0015% FSR max (B-grade)-enables sub-1 LSB error across full scale for precision weight and strain measurement. |
| Filter Corner Frequency | 0.1 Hz to 10 Hz (set by fCLKIN/409600)-provides >55 dB rejection at 60 Hz for noisy industrial environments. |
| Analog Input Range | Unipolar: 0 V to +2.5 V; Bipolar: ±2.5 V-matches standard reference voltages and simplifies front-end design. |
| Output Data Rate | Up to 4 kSPS (fCLKIN/1024)-supports real-time monitoring of slow-varying physical parameters. |
| Power Consumption | 25 mW typical active; 10 µW standby-enables loop-powered or battery-operated portable instrumentation. |
| Calibration Capability | On-chip self-calibration of zero and full scale, plus system-level offset/gain calibration via SC1/SC2 pins-removes need for external calibration hardware. |
Pinout & Package
AD7701ANZ is packaged in a 20-lead plastic DIP (N-20), with dual ±5 V analog supplies (AVDD/AVSS), separate digital supplies (DVDD/DVSS), isolated analog/digital grounds (AGND/DGND), and dedicated calibration, mode, and sleep control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE (Pin 1) | Serial interface configuration selector | Determines AC/SEC/SSC protocol-directly configures SCLK as input/output and defines data framing (start/stop bits vs. raw MSB-first). |
| AIN (Pin 9) | Analog signal input | High-impedance (1 nA bias), 10 pF input capacitance-accepts direct connection to low-output-impedance sensors without buffer amplification. |
| VREF (Pin 10) | Reference voltage input | Defines unipolar full scale (0 to VREF) or bipolar range (±VREF); accepts 2.5 V nominal with ±0.1 V overrange tolerance. |
| BP/UP (Pin 12) | Input range polarity selector | Logic-low = unipolar (0 V to VREF); logic-high = bipolar (±VREF)-enables single-device support for both sensor types. |
| CAL (Pin 13) | Calibration initiation strobe | Pulse >4 CLKIN cycles triggers zero/full-scale calibration; also synchronizes multiple AD7701ANZ devices in distributed systems. |
| SLEEP (Pin 11) | Ultralow-power mode enable | Logic-low reduces current draw to 10 µW by halting internal clock and modulator-critical for battery life extension. |
| DRDY (Pin 18) | Data ready status indicator | Active-low flag signals valid data in output register; pulses high for 4 CLKIN cycles during register update-prevents read-before-ready errors. |
| SDATA (Pin 20) | Serial data output | 16-bit word output synchronized to SCLK falling edge (SEC/SSC) or UART-compatible framing (AC)-eliminates need for external shift registers. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 6-pole Gaussian digital filter | Provides 55 dB 60 Hz rejection at 10 Hz cutoff-replaces external anti-aliasing filters and reduces BOM count in EMI-prone industrial settings. |
| Programmable filter corner frequency (0.1–10 Hz) | Enables adaptive noise suppression: lower corner for high-noise 50/60 Hz environments; higher corner for faster step response in lab-grade instrumentation. |
| System-level calibration support | SC1/SC2 pins allow inclusion of sensor and signal-conditioning circuitry in calibration loop-removes total system offset/gain drift without manual trim. |
| Three flexible serial interface modes | Direct UART compatibility (AC mode) and microcontroller SPI-like timing (SEC/SSC) simplify host integration across legacy and modern embedded platforms. |
| Ultralow 10 µW standby power | Permits duty-cycled operation in remote wireless sensors-e.g., wake-on-event, sample-and-sleep cycles extending battery life to years. |
Applications
| Industrial Weigh Scales | Remote Data Acquisition |
|---|---|
Use Scenario: High-resolution weight measurement in platform scales, hopper load cells, and tank level monitoring under variable temperature and EMI conditions. IC Role / Device Role / Timing Role: Primary ADC capturing low-frequency strain gauge bridge outputs with integrated 60 Hz notch filtering and self-calibration to maintain accuracy over time and temperature. Use Value: Eliminates need for external precision op-amps, reference buffers, and discrete calibration circuitry-reducing board area and long-term drift-related recalibration labor. |
Use Scenario: Battery-powered environmental sensor nodes measuring temperature, pressure, or humidity in oil/gas pipelines or agricultural fields. IC Role / Device Role / Timing Role: Low-power, high-accuracy signal digitizer operating in sleep-wake cycles, using SLEEP pin to enter 10 µW standby between 10-second sampling intervals. Use Value: Enables multi-year battery life while maintaining 16-bit resolution and <0.002% linearity-critical for unattended deployments where maintenance access is costly or impossible. |
| Portable Instrumentation | Chemical Process Monitoring |
Use Scenario: Handheld multimeters, pH meters, and dissolved oxygen analyzers requiring compact size, low power, and stable DC accuracy. IC Role / Device Role / Timing Role: Core ADC with on-chip VREF support and unipolar/bipolar mode switching-enables single hardware platform to serve multiple measurement ranges. Use Value: Reduces bill-of-materials by integrating reference, filtering, and calibration-allowing Class I handheld instruments to meet IEC 61000-4-3 immunity without added shielding or filtering components. |
Use Scenario: Continuous monitoring of reactor temperature, flow rate, and gas concentration in pharmaceutical or fine chemical synthesis. IC Role / Device Role / Timing Role: Precision front-end digitizer interfacing with RTDs, thermocouples, and electrochemical sensors-leveraging system calibration to compensate for lead-wire resistance and amplifier drift. Use Value: Ensures regulatory compliance (e.g., FDA 21 CFR Part 11) by guaranteeing traceable, repeatable measurements with no missing codes and documented calibration validity over full operating temperature range. |
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 |
|---|---|---|---|
| AD7703BNZ | Pin-compatible 16-bit sigma-delta ADC with identical N-20 package, same 0.0015% linearity, but adds differential input capability and improved PSRR (85 dB vs. 70/75 dB). | Preferred for differential sensor interfaces (e.g., load cells with ratiometric excitation) and higher EMI immunity requirements. | Select AD7703BNZ when differential inputs or enhanced power supply rejection are required; otherwise AD7701ANZ remains optimal for single-ended, cost-sensitive designs. |
| ADS1251U | 16-bit delta-sigma ADC in SO-8 package; 0.0005% linearity, 20 kSPS max, but requires external reference and lacks on-chip calibration memory or system calibration pins. | Suited for space-constrained PCBs and higher-speed sampling, but demands external calibration infrastructure and layout-sensitive reference routing. | Choose ADS1251U only when board area is critical and external calibration resources exist; AD7701ANZ provides superior out-of-box accuracy and reduced system integration effort. |
Compared with AD7703BNZ, AD7701ANZ offers identical accuracy and package but omits differential inputs-making it simpler and lower-cost for single-ended applications. Against ADS1251U, AD7701ANZ trades speed and footprint for integrated calibration, filtering, and supply flexibility-delivering faster time-to-prototype in industrial sensor systems.
Availability
AD7701ANZ is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and remote data acquisition requiring stable component supply, long-lifecycle support, and traceable sourcing for safety-critical deployments.
Supply support for AD7701ANZ 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, headquartered in Norwood, MA, with decades of expertise in precision data conversion and sensor signal conditioning.
The AD7701ANZ belongs to Analog Devices' LC2MOS precision sigma-delta ADC product line, engineered specifically for high-accuracy, low-power, low-frequency measurement in harsh industrial and portable environments-prioritizing stability, self-calibration, and system-level integration.
FAQ
What is the maximum master clock frequency supported by the AD7701ANZ?
The AD7701ANZ supports a maximum master clock frequency (CLKIN) of 5 MHz, with typical operation at 4.096 MHz. At this frequency, the device achieves a 10 Hz filter corner and 4 kSPS output data rate. Operation down to 200 kHz is guaranteed, enabling ultra-low-power configurations where clock frequency is reduced to lower power consumption and filter bandwidth.
Does the AD7701ANZ require an external voltage reference?
No-the AD7701ANZ does not require an external voltage reference. It accepts a 2.5 V nominal reference voltage at the VREF pin, which may be supplied by an external precision source or derived from an onboard regulator. The device uses this reference to define its unipolar (0 V to VREF) or bipolar (±VREF) input range and does not include an internal reference generator.
How does the AD7701ANZ handle system-level calibration of sensor front-end errors?
The AD7701ANZ supports system-level calibration via SC1 and SC2 pins, allowing the entire analog signal chain-including sensor, excitation circuitry, and conditioning amplifiers-to be included in the calibration loop. When CAL is asserted with specific SC1/SC2 states, the device performs offset and full-scale calibration using actual system inputs, thereby removing gain and offset errors introduced upstream of the AIN pin.
What are the power supply requirements for the AD7701ANZ?
The AD7701ANZ requires dual ±5 V analog supplies (AVDD = +5 V, AVSS = –5 V) and separate digital supplies (DVDD = +5 V, DVSS = –5 V), with absolute maximum ratings of ±5.5 V. Supply voltages must remain within ±10% tolerance during operation. The device draws up to 2.7 mA from each analog supply and 2 mA from DVDD under normal operation, dropping to 10 µW in SLEEP mode.
Can the AD7701ANZ interface directly with a microcontroller's SPI port?
Yes-the AD7701ANZ supports Synchronous External Clocking (SEC) mode, where the MODE pin is grounded and SCLK is configured as an input. In this mode, SDATA outputs raw 16-bit MSB-first data synchronized to SCLK falling edges, matching standard SPI timing without start/stop bits-enabling direct connection to most microcontroller SPI peripherals with minimal firmware overhead.
AD7701ANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7701ANZ FAQ
1.How can I place an order for AD7701ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7701ANZ 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 AD7701ANZ reliable?
The price and inventory of AD7701ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7701ANZ is usually 5 days.
3.What payment methods are accepted for AD7701ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7701ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7701ANZ?
AD7701ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7701ANZ 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 AD7701ANZ?
For technical support, including AD7701ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7701ANZ requirements.
6.How does Aetrix verify that AD7701ANZ is sourced from the original manufacturer or authorized distributors?
All AD7701ANZ 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 AD7701ANZ meets industry standards.
7.What is the process for return or replacement of AD7701ANZ?
All AD7701ANZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7701ANZ, 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 AD7701ANZ part is unused and in its original packaging.
Return procedure for AD7701ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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