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Analog Devices Inc. AD7721ARZ-REEL
- Part No.:
- AD7721ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7721ARZ-REEL.pdf
- Description:
- IC ADC 12/16BIT SIG-DELTA 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,343
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Product details
Overview
AD7721ARZ-REEL from Analog Devices is a 16-bit sigma-delta analog-to-digital converter (ADC) with 468.75 kHz output word rate, 229.2 kHz input bandwidth, and integrated dual-stage FIR digital filtering. It operates from a single +5 V supply, accepts differential analog inputs (0 V to 2.5 V or ±1.25 V), and features on-chip offset/gain calibration for <±4.88 mV full-scale error. It is used in high-precision industrial data acquisition systems requiring low-latency, high-resolution digitization of sensor signals.
For engineers reviewing the AD7721ARZ-REEL datasheet, AD7721ARZ-REEL pinout, AD7721ARZ-REEL application, or AD7721ARZ-REEL equivalent, key selection considerations include its dual-mode serial/parallel interface, 100 µW standby power, guaranteed no-missing-codes performance, and support for unipolar/bipolar input ranges with internal calibration - all in a 28-lead SOIC package.
Technical Context
The AD7721ARZ-REEL employs a single-bit sigma-delta modulator followed by two cascaded finite impulse response (FIR) filters, enabling high linearity and eliminating external antialiasing complexity beyond first-order RC networks. Its modulator samples at twice the master clock frequency (up to 30 MHz), and group delay is fixed at 48.53 µs at 15 MHz CLK.
It supports two distinct operating modes: serial mode (16-bit, 468.75 kHz OWR, 15 MHz max CLK) and parallel mode (12-bit, 312.5 kHz OWR, 10 MHz max CLK). Mode selection is hardware-configured via CS/RD/WR pin states at power-up, and control functions like UNI, CAL, and STBY are implemented as dedicated pins in serial mode or register bits in parallel mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit (serial mode); 12-bit (parallel mode) - defines quantization step size: 38 µV LSB (serial), 0.61 mV LSB (parallel) |
| Output Word Rate | 468.75 kHz (serial mode @ 15 MHz CLK) - determines maximum sampling throughput for real-time signal capture |
| Input Bandwidth | 229.2 kHz - usable analog signal spectrum before –3 dB roll-off; enables digitization of ultrasonic or fast transducer outputs |
| Dynamic Performance | 74 dB SNR (serial mode), –78 dB THD - meets precision requirements for vibration monitoring and power quality analysis |
| Power Consumption | 150 mW active, 100 µW standby - supports battery-backed or thermally constrained embedded systems |
| Analog Input Range | Differential: 0 V to 2.5 V (unipolar) or ±1.25 V (bipolar) - matches standard industrial sensor outputs without external level-shifting |
| Reference Input | 2.4 V to 2.6 V external reference (e.g., AD780) - ensures stable scaling independent of supply rail variations |
Pinout & Package
AD7721ARZ-REEL is housed in a 28-lead SOIC (Small Outline Integrated Circuit) package with 300 mil body width, RoHS-compliant lead finish, and moisture sensitivity level (MSL) 3. Pin 1 is marked with a dot; pin numbering follows standard counter-clockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK | Master Clock Input | CMOS-compatible input driving modulator sampling at 2× fCLK; sets OWR, filter cutoff, and settling time |
| VIN1 / VIN2 | Differential Analog Inputs | High-impedance inputs (20.8 kΩ typ @ 15 MHz) accepting 0–2.5 V or ±1.25 V; enable common-mode noise rejection |
| REFIN | External Reference Input | 2.4–2.6 V reference connection requiring 100 nF decoupling to AGND; defines full-scale range accuracy |
| DRDY | Data Ready Indicator | Rising edge (serial) or falling edge (parallel) signals valid output data availability; synchronizes host read timing |
| SCLK/DB7 | Serial Clock Output | Internally generated clock output (master mode); eliminates need for external SCLK generation in serial interface |
| SDATA/DB11 | Serial Data Output | 16-bit MSB-first serial output; data valid on falling edge of SCLK - simplifies FPGA/microcontroller interface design |
| STBY/DB0 | Standby Mode Control | Logic-high assertion disables modulator/filter clocks and analog bias, reducing power to 100 µW |
| UNI/DB2 | Input Range Select | Logic-low = unipolar (0–2.5 V); logic-high = bipolar (±1.25 V); configures transfer function and output coding format |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes | Guaranteed over full temperature range (–40°C to +85°C), ensuring monotonicity critical for closed-loop control feedback |
| On-chip calibration | Offset and gain correction performed internally via CAL pin or register bit; reduces system-level calibration effort and drift-induced errors |
| Integrated dual FIR filter | Reduces external antialiasing to simple first-order RC network - lowers BOM cost and board space vs. traditional ADCs |
| Low-power standby mode | 100 µW consumption with full retention of configuration; enables duty-cycled sensing in energy-constrained IoT nodes |
| Flexible interface options | Hardware-selectable serial (16-bit, master clock out) or parallel (12-bit, microcontroller-friendly) - supports diverse host architectures |
Applications
| Industrial Process Monitoring | Power Quality Analyzers |
|---|---|
Use Scenario: Continuous digitization of current/voltage transformer outputs in PLC-based control cabinets with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Primary high-resolution ADC capturing 50/60 Hz fundamentals plus harmonics up to 229.2 kHz with <48.53 µs group delay. Use Value: Enables real-time harmonic distortion analysis (THD ≤ –78 dB) and RMS calculation without external oversampling or post-processing. |
Use Scenario: Embedded measurement module in portable power analyzers logging voltage, current, and phase across three-phase distribution panels. IC Role / Device Role / Timing Role: Simultaneous dual-channel digitization (via multiplexed inputs) with synchronized DRDY timing for coherent sampling. Use Value: Delivers 74 dB SNR at 468.75 kHz OWR, supporting IEC 61000-4-30 Class A compliance for transient event capture. |
| Ultrasonic Flow Meters | Strain Gauge Signal Conditioning |
Use Scenario: Time-of-flight measurement in gas flow meters using piezoelectric transducers operating at 125–250 kHz carrier frequencies. IC Role / Device Role / Timing Role: High-bandwidth ADC front-end digitizing amplified echo signals with minimal group delay uncertainty. Use Value: 229.2 kHz input bandwidth and 97.07 µs step response allow precise envelope detection and zero-crossing timing for sub-millisecond flow resolution. |
Use Scenario: Bridge-based load cell interface in weigh scales and test benches where millivolt-level outputs require high dc accuracy and drift immunity. IC Role / Device Role / Timing Role: Precision sigma-delta converter with on-chip offset/gain calibration compensating for thermal drift in bridge excitation and amplification stages. Use Value: ±3.66 mV offset error and ±0.04 mV/°C unipolar offset drift ensure <0.01% FS stability over industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7738BRUZ | 24-bit resolution, 125 kHz OWR, SPI interface only, no parallel mode; requires external clock | Better resolution but lower speed; suited for static weight measurement, not dynamic signal capture | Select when ultra-high dc accuracy outweighs speed; avoid if 468.75 kHz OWR or parallel interface is required. |
| ADS127L01IPBSR | 24-bit, 512 kSPS, SPI-only, integrated PGA, lower power (38 mW), no on-chip calibration | Higher integration (PGA), lower power, but lacks hardware-calibration pin and dual-mode interface | Prefer for battery-powered sensors needing programmable gain; AD7721ARZ-REEL remains optimal for calibrated, interface-flexible industrial DAQ. |
Compared with AD7738BRUZ and ADS127L01IPBSR, the AD7721ARZ-REEL uniquely balances 16-bit speed (468.75 kHz), hardware-calibration simplicity, and dual serial/parallel configurability - making it the only choice for legacy microcontroller-based systems requiring pin-level calibration control and high-throughput analog capture.
Availability
AD7721ARZ-REEL is available at Aetrix Electronics and suitable for industrial process monitoring, power quality analyzers, ultrasonic flow metering, and strain gauge signal conditioning requiring stable component supply across extended production lifecycles.
Supply support for AD7721ARZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7721ARZ-REEL belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for high-speed, high-accuracy industrial data acquisition where deterministic timing, low power, and hardware-calibration control are essential.
FAQ
What is the maximum master clock frequency supported by AD7721ARZ-REEL in serial mode?
The AD7721ARZ-REEL supports a maximum master clock frequency of 15 MHz in serial mode, which yields its rated 468.75 kHz output word rate and 229.2 kHz input bandwidth. Operation above 15 MHz is not characterized or guaranteed; exceeding this limit may cause timing violations or undefined behavior in the modulator or digital filter stages.
Does AD7721ARZ-REEL require an external reference voltage?
Yes, the AD7721ARZ-REEL requires an external reference voltage applied to the REFIN pin, specified between 2.4 V and 2.6 V. A precision reference such as the AD780 is recommended. The device does not include an internal reference, and operation outside the 2.4–2.6 V range may degrade full-scale accuracy and increase gain error beyond ±4.88 mV.
How does the AD7721ARZ-REEL handle input overrange conditions?
The AD7721ARZ-REEL uses the DVAL pin to indicate overrange events: small overloads clip output to full scale and assert DVAL low; large overloads causing modulator instability trigger an automatic reset and hold DVAL low for 2080 clock cycles while output registers are set to negative full scale. DRDY continues asserting valid data during DVAL assertion.
Can AD7721ARZ-REEL operate in both unipolar and bipolar input modes?
Yes, the AD7721ARZ-REEL supports both unipolar (0 V to 2.5 V differential) and bipolar (±1.25 V differential) input ranges, selected via the UNI/DB2 pin: logic low enables unipolar mode with straight-binary output coding; logic high enables bipolar mode with 2's complement output coding. Calibration and linearity specs apply to both modes.
What is the purpose of the DSUBST pin on AD7721ARZ-REEL?
The DSUBST pin on AD7721ARZ-REEL is the substrate connection for the digital circuitry and must be tied directly to AGND (Pin 24) via a short, low-inductance path. This connection prevents latch-up and ensures stable digital logic operation by minimizing substrate potential shifts that could affect analog performance or cause ESD-related failures.
AD7721ARZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12, 16
- Sampling Rate (Per Second):
- 312.5k, 468.75k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, Parallel
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7721ARZ-REEL FAQ
1.How can I place an order for AD7721ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7721ARZ-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 AD7721ARZ-REEL reliable?
The price and inventory of AD7721ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7721ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7721ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7721ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7721ARZ-REEL?
AD7721ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7721ARZ-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 AD7721ARZ-REEL?
For technical support, including AD7721ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7721ARZ-REEL requirements.
6.How does Aetrix verify that AD7721ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7721ARZ-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 AD7721ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7721ARZ-REEL?
All AD7721ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7721ARZ-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 AD7721ARZ-REEL part is unused and in its original packaging.
Return procedure for AD7721ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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