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Analog Devices Inc. AD7703BRZ-REEL
- Part No.:
- AD7703BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7703BRZ-REEL.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,410
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Product details
Overview
AD7703BRZ-REEL from Analog Devices is a monolithic 20-bit sigma-delta analog-to-digital converter with on-chip 6-pole Gaussian digital filter, self-calibration microcontroller, and flexible serial interface. It delivers ±0.0003% typical integral nonlinearity (INL), 4 kSPS output data rate, and 0.1 Hz to 10 Hz programmable low-pass filter corner frequency. It is designed for high-accuracy DC/low-frequency measurement in industrial process control systems.
For engineers reviewing the AD7703BRZ-REEL datasheet, AD7703BRZ-REEL pinout, AD7703BRZ-REEL application, or AD7703BRZ-REEL equivalent, key selection criteria include guaranteed no missing codes, ultralow 10 µW standby power, bipolar/unipolar input range configuration, system calibration capability for external gain/offset errors, and compatibility with industry-standard microcontroller serial ports via SSC or SEC modes.
Technical Context
The AD7703BRZ-REEL employs a second-order sigma-delta modulator with charge-balancing architecture and oversampling at 16 kHz, followed by a deterministic six-pole Gaussian digital filter that updates the 20-bit output register at up to 4 kHz. Its internal calibration logic supports zero/full-scale self-calibration and extends to system-level offset/gain correction when external components are included in the calibration loop.
It operates in two serial interface modes: Synchronous Self-Clocking (SSC) with SCLK output at fCLKIN/4 and 25% duty cycle, or Synchronous External Clocking (SEC) with SCLK as input and unformatted MSB-first output. Power management includes a dedicated SLEEP pin enabling 10 µW typical standby consumption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit binary output with guaranteed no missing codes - ensures full dynamic range usability without gain staging. |
| Integral Nonlinearity | ±0.0003% FSR max (C version) - enables sub-1 ppm linearity-critical applications like precision weigh scales. |
| Output Data Rate | 4 kSPS maximum - supports real-time monitoring of slow-varying physical/chemical signals. |
| Filter Corner Frequency | 0.1 Hz to 10 Hz (set by fCLKIN/409,600) - provides >55 dB 60 Hz rejection at 10 Hz cutoff for AC mains noise suppression. |
| Input Ranges | Unipolar: 0 V to +2.5 V; Bipolar: ±2.5 V - selectable via BP/UP pin, simplifying sensor interface design. |
| Power Consumption | 25 mW typical active; 10 µW typical standby - suitable for loop-powered remote sensors and battery-operated instrumentation. |
| Analog Supplies | AVDD/AVSS = ±5 V; Digital supplies DVDD/DVSS = ±5 V - dual-supply operation supports true bipolar signal acquisition. |
Pinout & Package
AD7703BRZ-REEL is packaged in a 20-lead SOIC (Small Outline Integrated Circuit) with standard 0.3-inch body width and gull-wing leads. Pin numbering follows JEDEC MS-013, with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE | Serial interface mode select | Ground = SEC mode (SCLK input); +5 V = SSC mode (SCLK output at fCLKIN/4). |
| AIN | Analog input | High-impedance input (1 nA bias) requiring ≤750 Ω source resistance and 1 nF capacitor to AGND. |
| VREF | Reference voltage input | 2.5 V nominal reference defining full-scale range; supports ±0.1 V overrange for system calibration headroom. |
| BP/UP | Bipolar/unipolar configuration | Low = unipolar (0 V to VREF); High = bipolar (±VREF) - sets transfer function polarity and span. |
| CAL | Calibration trigger | Pulse high ≥4 CLKIN cycles initiates self-calibration or synchronizes multiple AD7703 devices. |
| SLEEP | Standby control | Logic low reduces power to 10 µW; requires CLKIN stop for full standby current specification. |
| DRDY | Data ready flag | Active-low open-drain output indicating valid data in output register; pulses high during register update. |
| SDATA | Serial data output | 20-bit MSB-first serial word; high-impedance when CS is high or after transmission completes. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes | Guaranteed 20-bit monotonicity eliminates need for post-conversion gain adjustment or dithering. |
| On-chip self-calibration | Zero and full-scale calibration removes temperature drift effects; supports system-level calibration including external front-end errors. |
| Programmable digital filter | 6-pole Gaussian response with configurable corner frequency (0.1–10 Hz) enables precise noise rejection without external analog filters. |
| Flexible serial interface | SSC and SEC modes allow direct connection to UARTs, shift registers, or microcontroller SPI peripherals without protocol translation. |
| Ultralow standby power | 10 µW typical consumption in SLEEP mode enables multi-year battery life in portable instrumentation. |
Applications
| Industrial Process Control | Weigh Scales |
|---|---|
Use Scenario: Monitoring pressure, temperature, and flow transducers in chemical plant PLC I/O modules. IC Role / Device Role / Timing Role: Primary 20-bit ADC digitizing 4–20 mA loop signals conditioned by precision op-amps and reference buffers. Use Value: ±0.0003% INL and on-chip calibration ensure long-term accuracy without field recalibration, reducing maintenance downtime. | Use Scenario: High-resolution load cell readout in platform scales and hopper weighing systems. IC Role / Device Role / Timing Role: Charge-balancing ADC capturing millivolt-level bridge outputs with 0.1 µV/LSB resolution (2.5 V ref). Use Value: Guaranteed no missing codes and 20-bit dynamic range eliminate software averaging or gain switching, improving throughput and repeatability. |
| Portable Instrumentation | Remote Data Acquisition |
Use Scenario: Battery-powered handheld multimeters and environmental sensors measuring pH, dissolved oxygen, or gas concentration. IC Role / Device Role / Timing Role: Low-power ADC acquiring DC-stable sensor outputs while minimizing quiescent current draw. Use Value: 10 µW standby power and 25 mW active dissipation extend AA/AAA battery life to >2 years in intermittent-read applications. | Use Scenario: Wireless sensor nodes deployed in oilfield telemetry or water quality monitoring networks. IC Role / Device Role / Timing Role: Precision ADC interfacing with isolated analog front-ends and RF transceivers in loop-powered 4–20 mA or HART-compatible designs. Use Value: Bipolar/unipolar mode flexibility and system calibration support enable single hardware design for multiple sensor types (e.g., thermocouples vs. RTDs). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 20-bit sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7714BRUZ | 5-channel 24-bit sigma-delta ADC with PGA, higher resolution but no SLEEP pin; 3.3 V/5 V dual supply. | Multi-sensor systems requiring channel multiplexing and programmable gain; less suitable for ultra-low-power standalone sensing. | Select AD7714BRUZ when multi-channel acquisition and on-chip PGA are required; AD7703BRZ-REEL remains optimal for single-channel, lowest-power, cost-sensitive designs. |
| LTC2440CGN#PBF | 24-bit delta-sigma ADC with internal oscillator, 1.2 V to 5.5 V supply, no bipolar mode; 0.0001% INL typ. | Single-ended, wide-supply-range applications where bipolar input and external clock control are unnecessary. | Choose LTC2440CGN#PBF for wider supply flexibility and slightly better linearity; retain AD7703BRZ-REEL for bipolar operation, system calibration integration, and legacy 5 V/±5 V system compatibility. |
Compared with AD7714BRUZ and LTC2440CGN#PBF, the AD7703BRZ-REEL uniquely combines bipolar/unipolar configurability, dedicated SLEEP control for sub-10 µW standby, and explicit system calibration support for external front-end error removal-making it the preferred choice for calibrated, low-power, single-channel industrial sensing.
Availability
AD7703BRZ-REEL is available at Aetrix Electronics and suitable for industrial process control, weigh scale manufacturing, portable instrumentation, and remote data acquisition requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for AD7703BRZ-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 Wilmington, MA.
The AD7703BRZ-REEL belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for high-accuracy, low-frequency measurement of physical, chemical, and biological signals in harsh industrial environments.
FAQ
What is the maximum master clock frequency supported by the AD7703BRZ-REEL?
The AD7703BRZ-REEL supports a maximum master clock frequency of 5 MHz, whether supplied externally to CLKIN or generated internally using a crystal between CLKIN and CLKOUT. At 4.096 MHz, it achieves its specified 10 Hz filter corner frequency and 4 kSPS output data rate. Operation down to 200 kHz is guaranteed, enabling ultra-low-power configurations with reduced sampling rates.
Does the AD7703BRZ-REEL require external analog anti-aliasing filtering?
No, the AD7703BRZ-REEL does not require external analog anti-aliasing filters due to its inherent oversampling and on-chip 6-pole Gaussian digital filter, which provides >55 dB rejection at 60 Hz when configured for 10 Hz corner frequency. However, analog input filtering is recommended for noise spikes exceeding ±100 mV overrange to prevent modulator saturation.
How does the system calibration feature of the AD7703BRZ-REEL handle external front-end errors?
The AD7703BRZ-REEL's system calibration mode (SC2 low) allows external circuitry-including sensor excitation, signal conditioning amplifiers, and reference buffers-to be included in the calibration loop. This enables simultaneous nulling of both AD7703BRZ-REEL internal errors and external gain/offset drift, achieving end-to-end accuracy without manual trimming.
What are the power supply requirements for proper operation of the AD7703BRZ-REEL?
The AD7703BRZ-REEL requires dual ±5 V analog supplies (AVDD = +5 V, AVSS = –5 V) and dual ±5 V digital supplies (DVDD = +5 V, DVSS = –5 V), all within ±10% tolerance. Supply voltages below 4.5 V or above 5.5 V (or –4.5 V/–5.5 V) may cause specification degradation or functional failure. A minimum 2.0 V supply is required to retain calibration memory during brownout.
Can the AD7703BRZ-REEL interface directly with a microcontroller's SPI port?
Yes, the AD7703BRZ-REEL supports direct SPI-compatible interfacing in Synchronous External Clocking (SEC) mode: when MODE is tied to DGND, SCLK becomes an input and SDATA outputs unformatted 20-bit MSB-first data synchronized to SCLK edges. DRDY serves as a ready signal, eliminating polling overhead in microcontroller firmware.
AD7703BRZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 20
- 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:
- -
AD7703BRZ-REEL FAQ
1.How can I place an order for AD7703BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7703BRZ-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 AD7703BRZ-REEL reliable?
The price and inventory of AD7703BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7703BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7703BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7703BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7703BRZ-REEL?
AD7703BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7703BRZ-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 AD7703BRZ-REEL?
For technical support, including AD7703BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7703BRZ-REEL requirements.
6.How does Aetrix verify that AD7703BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7703BRZ-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 AD7703BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7703BRZ-REEL?
All AD7703BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7703BRZ-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 AD7703BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7703BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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