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Analog Devices Inc. AD7984BRMZ-RL7
- Part No.:
- AD7984BRMZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7984BRMZ-RL7.pdf
- Description:
- IC ADC 18BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,334
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Product details
Overview
AD7984BRMZ-RL7 from Analog Devices is an 18-bit, 1.33 MSPS successive approximation register (SAR) ADC with true differential input, ±VREF range, zero-latency architecture, and 99.7 dB dynamic range at 5 V reference-designed for high-precision data acquisition in automated test equipment and medical instrumentation.
For engineers reviewing the AD7984BRMZ-RL7 datasheet, AD7984BRMZ-RL7 pinout, AD7984BRMZ-RL7 application, or AD7984BRMZ-RL7 equivalent, this page delivers verified specifications, validated pin functions, confirmed package mapping (10-lead MSOP), real-world use scenarios, and two rigorously cross-checked alternative parts for precision SAR ADC selection.
Technical Context
The AD7984BRMZ-RL7 implements a charge redistribution capacitive DAC with dual 18-bit binary-weighted capacitor arrays, enabling true differential sampling without pipeline delay. Its on-chip track-and-hold ensures zero latency and supports full 1.33 MSPS throughput with 250 ns acquisition time and 300–500 ns conversion time.
It features a SPI/QSPI/MICROWIRE-compatible serial interface with daisy-chain capability via SDI/SDO, busy indicator support, and independent VIO supply (1.71–5.5 V) for seamless interfacing with 1.8 V, 2.5 V, 3 V, or 5 V logic-while maintaining ±2.25 LSB INL and 98.5 dB SNR at 1 kHz with 5 V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes-guarantees monotonicity and full code coverage across full-scale range. |
| Throughput Rate | 1.33 MSPS at VIO > 2.3 V-enables real-time capture of fast transients in high-speed DAQ systems. |
| INL | ±2.25 LSB max-ensures accurate end-point linearity critical for calibration-sensitive applications like medical imaging. |
| Dynamic Range | 99.7 dB at VREF = 5 V-supports detection of low-amplitude signals buried in noise, e.g., sensor outputs in industrial monitoring. |
| Power Dissipation | 10.5 mW total at 1.33 MSPS-achieves high performance with ultra-low power, ideal for thermally constrained embedded systems. |
| Analog Input Range | True differential ±VREF (2.9–5.1 V)-allows direct connection to bipolar signal sources without external level-shifting circuitry. |
| Aperture Delay | 2 ns-minimizes sampling uncertainty for high-frequency signal fidelity up to 10 MHz input bandwidth. |
Pinout & Package
The AD7984BRMZ-RL7 is packaged in a 10-lead MSOP (RM-10) with exposed paddle, rated for −40°C to +85°C operation. Pin 1 is REF; pin 5 is GND; pin 6 is CNV (convert trigger); pins 7–9 are SDO/SCK/SDI for SPI-compatible serial interface; pin 10 is VIO for independent digital I/O supply.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | Analog reference input | Accepts 2.9–5.1 V external reference; requires local 10 µF decoupling to GND for stable full-scale accuracy. |
| VDD (Pin 2) | Analog power supply | 2.375–2.625 V single supply; powers internal SAR core and track-and-hold-no separate AVDD/DVDD required. |
| IN+ / IN− (Pins 3, 4) | Differential analog inputs | Accept true differential voltage swing up to ±VREF; common-mode range centered at VREF × 0.5 ± 2.5%. |
| GND (Pin 5) | Analog/digital ground | Single ground reference for all supplies and analog inputs-requires low-impedance PCB connection to minimize noise coupling. |
| CNV (Pin 6) | Convert trigger & mode select | Rising edge initiates conversion; logic state at CNV edge selects CS mode (SDI high) or chain mode (SDI low). |
| SDO (Pin 7) | Serial data output | 18-bit twos-complement result synchronized to SCK falling edge; tri-state when CNV or SDI is high in CS mode. |
| SCK (Pin 8) | Serial clock input | Accepts 10.5–22 ns period depending on VIO; controls data shift-out timing-no clock required for internal conversion. |
| SDI (Pin 9) | Serial data input / mode control | Determines interface mode on CNV rising edge; enables daisy-chain configuration by passing upstream data with 18-cycle delay. |
| VIO (Pin 10) | Digital I/O supply | 1.71–5.5 V independent supply-sets logic thresholds for all digital pins, enabling mixed-voltage system interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency architecture | Eliminates pipeline delay-conversion result available immediately after tCONV (≤500 ns), essential for closed-loop control timing. |
| Proprietary SPI-compatible interface | Supports 3-wire CS mode and 4-wire chain mode with busy indicator-reduces GPIO count and simplifies multi-ADC synchronization. |
| Independent VIO supply | Enables direct interfacing with 1.8 V FPGA I/O banks or 5 V microcontroller peripherals without level shifters or voltage translation. |
| Low power at high speed | 10.5 mW total at 1.33 MSPS (7.9 nJ/conversion)-delivers industry-leading energy efficiency for battery-powered or fanless DAQ systems. |
| Wide reference voltage range | 2.9–5.1 V external REF-permits optimization of dynamic range and SNR for specific sensor output ranges (e.g., ±10 V, ±5 V). |
Applications
| Automated Test Equipment | Data Acquisition Systems |
|---|---|
Use Scenario: High-speed parametric testing of semiconductor devices requiring sub-LSB linearity and repeatable DC accuracy across temperature. IC Role / Device Role / Timing Role: Primary digitizer capturing analog stimulus-response waveforms at 1.33 MSPS with zero latency to enable real-time pass/fail decisioning. Use Value: ±2.25 LSB INL and 99.7 dB dynamic range ensure measurement repeatability within 0.001% of full scale-critical for ATE yield analysis. | Use Scenario: Modular rack-mounted DAQ unit acquiring synchronized multi-channel sensor data (strain gauges, RTDs, accelerometers) in industrial environments. IC Role / Device Role / Timing Role: Precision front-end ADC with true differential inputs and robust EMI immunity, operating over −40°C to +85°C. Use Value: 10.5 mW power at full speed enables dense channel packing without thermal derating; daisy-chain interface reduces wiring complexity in multi-slot chassis. |
| Medical Instruments | Machine Automation |
Use Scenario: Portable ultrasound beamformer or patient monitor acquiring low-noise biopotential signals (ECG, EEG) with high resolution and low THD. IC Role / Device Role / Timing Role: High-SNR analog-to-digital converter driving digital signal processing pipelines where 98.5 dB SNR and −110.5 dB THD preserve diagnostic fidelity. Use Value: 98.5 dB SNR at 1 kHz and 97.5 dB SINAD enable detection of microvolt-level physiological signals amid system noise floor. | Use Scenario: Servo drive feedback loop capturing motor phase currents and position encoder signals in real time for field-oriented control. IC Role / Device Role / Timing Role: Low-latency current sensing ADC with fast acquisition (250 ns) and deterministic conversion timing for PWM-synchronized sampling. Use Value: 2 ns aperture delay and 290 ns transient response ensure accurate capture of fast current transients during switching events-preventing torque ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 18-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7982BRMZ | Pin-for-pin compatible; identical 18-bit/1.33 MSPS spec but lower dynamic range (98.5 dB vs. 99.7 dB) and higher INL (±2.5 LSB vs. ±2.25 LSB). | Acceptable where 1.2 dB SNR margin and 0.25 LSB linearity tolerance are acceptable-e.g., non-critical industrial logging. | Select AD7982BRMZ only if cost sensitivity outweighs need for highest linearity and dynamic range in metrology-grade systems. |
| AD4003BRMZ | 18-bit, 1 MSPS; lower power (7.5 mW), wider input range (±VREF up to ±5.5 V), but slower throughput and no daisy-chain capability. | Better suited for low-power, wide-input-range applications where 330 kSPS headroom is acceptable-e.g., portable multimeters. | Choose AD4003BRMZ when prioritizing ultra-low power and extended analog range over maximum speed and multi-ADC synchronization. |
Compared with AD7982BRMZ and AD4003BRMZ, the AD7984BRMZ-RL7 uniquely combines 1.33 MSPS throughput, 99.7 dB dynamic range, and daisy-chain support-making it optimal for high-channel-count, high-fidelity DAQ where timing determinism and signal integrity are non-negotiable.
Availability
AD7984BRMZ-RL7 is available at Aetrix Electronics and suitable for automated test equipment, medical instruments, and machine automation requiring stable component supply, long-term production continuity, and guaranteed traceable sourcing.
Supply support for AD7984BRMZ-RL7 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 AD7984BRMZ-RL7 belongs to Analog Devices' precision SAR ADC product line, engineered for applications demanding high resolution, low latency, and exceptional AC/DC accuracy-including test & measurement, medical imaging, and industrial process control.
FAQ
What is the maximum supported reference voltage for AD7984BRMZ-RL7?
The AD7984BRMZ-RL7 accepts an external reference voltage from 2.9 V to 5.1 V. Operation at 5.0 V yields optimal dynamic range (99.7 dB) and SNR (98.5 dB), while lower references reduce full-scale range proportionally. The REF pin must be decoupled with a 10 µF ceramic capacitor to GND per the datasheet layout guidelines.
Does AD7984BRMZ-RL7 require an external clock for conversion?
No, the AD7984BRMZ-RL7 contains an on-board conversion clock and does not require an external clock for the SAR process. The SCK signal is used solely for serial data readout and has no effect on conversion timing. Conversion is triggered by the CNV rising edge, and results are available within 300–500 ns regardless of SCK frequency.
Can AD7984BRMZ-RL7 interface directly with a 1.8 V FPGA I/O bank?
Yes, the AD7984BRMZ-RL7 supports direct interfacing with 1.8 V logic through its dedicated VIO pin (Pin 10). When VIO = 1.8 V, digital inputs (CNV, SDI, SCK) accept standard 1.8 V logic levels, and SDO outputs are compatible with 1.8 V receivers-eliminating need for external level shifters in mixed-voltage systems.
What is the significance of the "zero latency" architecture in AD7984BRMZ-RL7?
Zero latency means the AD7984BRMZ-RL7 produces a valid conversion result immediately after completion of the conversion cycle (≤500 ns), with no pipeline delay or buffering. This enables deterministic, cycle-accurate sampling-critical for real-time control loops, high-speed transient capture, and time-aligned multi-channel acquisition where delayed data would compromise system timing integrity.
How does the daisy-chain mode work on AD7984BRMZ-RL7?
In daisy-chain mode (enabled by pulling SDI low at CNV rising edge), multiple AD7984BRMZ-RL7 devices share one SDO line. Each device passes upstream conversion data with a fixed 18-cycle delay, allowing sequential readout of N devices using a single SCK and SDO connection. This reduces PCB routing complexity and GPIO usage in high-channel-density systems without sacrificing throughput.
AD7984BRMZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 1.33M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.375V ~ 2.625V
- Voltage - Supply, Digital:
- 2.375V ~ 2.625V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7984BRMZ-RL7 FAQ
1.How can I place an order for AD7984BRMZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7984BRMZ-RL7 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 AD7984BRMZ-RL7 reliable?
The price and inventory of AD7984BRMZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7984BRMZ-RL7 is usually 5 days.
3.What payment methods are accepted for AD7984BRMZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7984BRMZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7984BRMZ-RL7?
AD7984BRMZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7984BRMZ-RL7 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 AD7984BRMZ-RL7?
For technical support, including AD7984BRMZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7984BRMZ-RL7 requirements.
6.How does Aetrix verify that AD7984BRMZ-RL7 is sourced from the original manufacturer or authorized distributors?
All AD7984BRMZ-RL7 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 AD7984BRMZ-RL7 meets industry standards.
7.What is the process for return or replacement of AD7984BRMZ-RL7?
All AD7984BRMZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7984BRMZ-RL7, 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 AD7984BRMZ-RL7 part is unused and in its original packaging.
Return procedure for AD7984BRMZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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