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Analog Devices Inc. AD7903BRQZ
- Part No.:
- AD7903BRQZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
AD7903BRQZ.pdf
- Description:
- IC ADC 16BIT SAR 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:643
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Product details
Overview
AD7903BRQZ from Analog Devices is a dual 16-bit successive approximation register (SAR) analog-to-digital converter with true differential inputs, 1 MSPS throughput, ±0.5 LSB typical INL, 93.5 dB SINAD at 1 kHz, and 12.0 mW total power dissipation at full speed. It operates from a single 2.5 V supply per ADC channel with independent 1.8 V to 5 V logic interface voltage (VIO), enabling integration into battery-powered data acquisition and simultaneous-sampling instrumentation systems.
For engineers reviewing the AD7903BRQZ datasheet, AD7903BRQZ pinout, AD7903BRQZ application, or AD7903BRQZ equivalent, key selection criteria include simultaneous dual-channel sampling capability, no pipeline delay, ±VREF differential input range (2.4 V to 5.1 V reference), and QSOP-20 package compatibility with high-density PCB layouts requiring thermal stability from −40°C to +125°C.
Technical Context
The AD7903BRQZ implements two independent SAR ADC cores sharing a common serial interface architecture, each with on-chip track-and-hold and charge redistribution DAC. Conversion is initiated by CNVx rising edge, with no latency between sample capture and result availability - critical for real-time control loops.
Its SPI/QSPI/MICROWIRE/DSP-compatible serial port supports both CS mode and daisy-chain (chain) mode, using SDIx pins to configure interface behavior at conversion start. Independent VIOx supplies allow seamless interfacing with mixed-voltage host processors while maintaining full 16-bit accuracy across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full-scale code coverage for precision measurement. |
| Throughput | 1 MSPS per channel - enables real-time capture of fast transients in ATE and medical waveform analysis. |
| INL | ±2.0 LSB maximum - ensures end-point linearity within ±0.03% of full scale for calibrated sensor interfaces. |
| SINAD | 93.5 dB at 1 kHz - delivers >15.5 ENOB for high-fidelity signal reconstruction in communications receivers. |
| Power Dissipation | 12.0 mW at 1 MSPS (total) - balances speed and efficiency for thermally constrained embedded systems. |
| Reference Range | 2.4 V to 5.1 V - supports flexible scaling from ±2.4 V to ±5.1 V differential input without external gain stages. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive sensors and industrial motor control feedback paths. |
Pinout & Package
The AD7903BRQZ is housed in a 20-lead QSOP package (3.9 mm × 8.7 mm, 0.65 mm pitch), optimized for thermal performance and board-level reliability in high-temperature environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1+, IN2+ | Differential positive analog input | Accepts true differential signals up to ±VREF; requires matched layout to preserve CMRR >67 dB at 450 kHz. |
| IN1−, IN2− | Differential negative analog input | Completes differential pair; common-mode voltage must stay within VREF×0.475 to VREF×0.525 for optimal linearity. |
| REF1, REF2 | External reference voltage input | Accepts 2.4 V–5.1 V reference; decoupling with 10 µF capacitor per pin is mandatory for <1 LSB noise floor. |
| VDD1, VDD2 | Analog power supply | 2.375 V–2.625 V per ADC; powers core SAR and track-and-hold; low-noise regulation required. |
| VIO1, VIO2 | Digital I/O supply | 1.8 V–5.5 V logic interface supply; enables direct connection to FPGA/ASIC I/O banks without level shifters. |
| CNV1, CNV2 | Conversion trigger input | Rising edge initiates sampling; also selects interface mode (CS vs. chain) based on SDIx state at edge. |
| SDO1, SDO2 | Serial data output | Two's complement output synchronized to SCKx; high-impedance when CNVx is high in CS mode. |
| SCK1, SCK2 | Serial clock input | Drives data readout; minimum period 10.5 ns (VIO > 4.5 V); timing-critical for jitter-sensitive applications. |
| SDI1, SDI2 | Serial data input | Configures interface mode at CNVx rising edge; enables busy indicator when low during conversion completion. |
| GND (Pins 5, 10) | Analog/digital ground | Common return for all supplies; split-plane layout recommended to isolate analog and digital return currents. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Independent CNV1/CNV2 triggers enable true time-aligned acquisition across both channels - essential for phase-sensitive measurements like motor current/voltage vector analysis. |
| No pipeline delay | Conversion results available immediately after completion (0-sample pipeline delay) - eliminates timing uncertainty in closed-loop control systems. |
| Channel-to-channel isolation | −120 dB at 10 kHz - prevents crosstalk-induced errors in dual-sensor monitoring (e.g., redundant pressure/temperature sensing). |
| Low power scalability | 140 µW at 10 kSPS - reduces thermal load and extends battery life in portable diagnostic equipment without sacrificing resolution. |
| Flexible reference interface | VREF independent of VDD and VIO - allows use of precision external references (e.g., ADR4550) without supply coupling artifacts. |
Applications
| Battery-Powered Data Loggers | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous 16-bit recording of sensor outputs (e.g., strain gauges, thermocouples) in handheld field instruments with 10-year battery life. IC Role / Device Role / Timing Role: Dual-channel simultaneous sampling ADC capturing correlated analog signals with zero inter-channel skew and no latency. Use Value: 140 µW power at 10 kSPS enables multi-year operation on coin-cell batteries while preserving full 16-bit resolution and ±2.0 LSB INL accuracy. | Use Scenario: High-speed stimulus-response testing of RF front-end modules requiring synchronized voltage/current sampling at 1 MSPS. IC Role / Device Role / Timing Role: Precision dual ADC providing time-aligned digitization of DUT output and feedback path for real-time error correction. Use Value: −120 dB channel isolation and 93.5 dB SINAD ensure measurement fidelity down to −112 dB THD, meeting Class A ATE spectral purity requirements. |
| Medical Patient Monitoring | Industrial Motor Control Feedback |
Use Scenario: Simultaneous acquisition of ECG and respiration waveforms in portable patient monitors with strict EMI immunity and low-power operation. IC Role / Device Role / Timing Role: Dual SAR ADC delivering artifact-free, time-coherent digitization of biopotential signals referenced to ±2.5 V internal reference. Use Value: True differential inputs reject common-mode interference; 67 dB analog input CMRR at 450 kHz suppresses 50/60 Hz mains coupling in unshielded clinical environments. | Use Scenario: Real-time current and bus voltage sensing in servo drives where phase alignment between current and voltage samples determines torque accuracy. IC Role / Device Role / Timing Role: Simultaneously sampled dual ADC feeding FOC algorithm with sub-ns aperture delay match (2.0 ns) for precise vector calculation. Use Value: Aperture delay match ≤2.0 ns ensures <0.1° phase error at 20 kHz PWM frequency - critical for high-efficiency motor commutation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7902BRQZ | Pseudo-differential input (single-ended IN+ with IN− tied to reference), same 16-bit/1 MSPS specs and QSOP-20 footprint. | Limited to single-ended sensor interfaces; lacks true differential rejection needed for noisy industrial environments. | Select AD7902BRQZ only when cost-sensitive designs use grounded-sense or ratiometric sensors with minimal common-mode noise. |
| ADS8860IDRCT | Single-channel, 16-bit, 1 MSPS SAR ADC in 3mm × 3mm WSON-10; no simultaneous sampling or dual-channel support. | Requires two devices and external synchronization for dual-channel use - increases BOM count and layout complexity. | Choose ADS8860IDRCT when space-constrained PCBs prioritize footprint size over channel synchronization and integrated dual functionality. |
Compared with AD7903BRQZ, AD7902BRQZ offers identical speed and resolution but sacrifices true differential input capability, while ADS8860IDRCT provides smaller packaging at the cost of losing native dual-channel simultaneity and increasing system-level design effort.
Availability
AD7903BRQZ is available at Aetrix Electronics and suitable for battery-powered equipment, automated test equipment (ATE), and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7903BRQZ 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 AD7903 belongs to the PulSAR® family of precision SAR ADCs designed specifically for high-speed, low-power, simultaneous-sampling applications in industrial, medical, and test equipment where accuracy, timing integrity, and thermal robustness are critical.
FAQ
What is the maximum allowable reference voltage for the AD7903BRQZ?
The AD7903BRQZ supports an external reference voltage range of 2.4 V to 5.1 V on REF1 and REF2 pins. Exceeding 5.1 V violates absolute maximum ratings and may cause permanent damage. At 5.0 V reference, the device achieves 93.5 dB SINAD and ±0.5 LSB typical INL - values confirmed in the Rev. B datasheet under standard test conditions.
Does the AD7903BRQZ support true simultaneous sampling across both channels?
Yes, the AD7903BRQZ supports true simultaneous sampling via independent CNV1 and CNV2 inputs. Each rising edge triggers acquisition on its respective channel with aperture delay match ≤2.0 ns, ensuring time-aligned conversion starts. This capability is explicitly documented in the Functional Block Diagram and Timing Specifications tables of the AD7903BRQZ datasheet.
What digital interface protocols is the AD7903BRQZ compatible with?
The AD7903BRQZ serial port is compatible with SPI, QSPI, MICROWIRE, and DSP interface standards. It supports both active-low chip select (CS) mode and daisy-chain (chain) mode, selectable via SDI1/SDI2 state at CNVx rising edge. Logic levels accommodate 1.8 V, 2.5 V, 3 V, or 5 V host systems using separate VIO1/VIO2 supplies.
Can the AD7903BRQZ operate from a single 2.5 V supply for both analog and digital sections?
No - the AD7903BRQZ requires separate analog (VDD1/VDD2) and digital I/O (VIO1/VIO2) supplies. VDDx must be 2.375 V–2.625 V (nominal 2.5 V), while VIOx supports 1.8 V–5.5 V. This separation enables noise isolation and mixed-voltage system interfacing, as specified in Table 3 and the Power Supply section of the AD7903BRQZ datasheet.
Is the AD7903BRQZ pin-compatible with any other Analog Devices ADCs?
Yes, the AD7903BRQZ is pin-for-pin compatible with the AD7902BRQZ, a pseudo-differential dual 16-bit SAR ADC in the same QSOP-20 package. This compatibility allows drop-in replacement in existing layouts when upgrading from single-ended to true differential input requirements, as stated in the Theory of Operation section of the AD7903BRQZ datasheet.
AD7903BRQZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.375V ~ 2.625V
- Voltage - Supply, Digital:
- 2.375V ~ 2.625V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 20-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7903BRQZ FAQ
1.How can I place an order for AD7903BRQZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7903BRQZ 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 AD7903BRQZ reliable?
The price and inventory of AD7903BRQZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7903BRQZ is usually 5 days.
3.What payment methods are accepted for AD7903BRQZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7903BRQZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7903BRQZ?
AD7903BRQZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7903BRQZ 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 AD7903BRQZ?
For technical support, including AD7903BRQZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7903BRQZ requirements.
6.How does Aetrix verify that AD7903BRQZ is sourced from the original manufacturer or authorized distributors?
All AD7903BRQZ 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 AD7903BRQZ meets industry standards.
7.What is the process for return or replacement of AD7903BRQZ?
All AD7903BRQZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7903BRQZ, 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 AD7903BRQZ part is unused and in its original packaging.
Return procedure for AD7903BRQZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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