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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. AD7984BCPZ-RL7

Name: AD7984BCPZ-RL7
Brand: Analog Devices Inc.
SKU: AD7984BCPZ-RL7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7984BCPZ-RL7

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 10-VFDFN Exposed Pad, CSP

Datasheet:: AD7984BCPZ-RL7.pdf

Description:: IC ADC 18BIT SAR 10LFCSP

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Product details

Overview

AD7984BCPZ-RL7 from Analog Devices is an 18-bit, 1.33 MSPS successive approximation register (SAR) analog-to-digital converter with true differential input, ±V_REF range, zero-latency architecture, and SPI/QSPI/MICROWIRE-compatible serial interface. It operates from a single 2.5 V supply with separate 1.8 V–5 V I/O voltage (V_IO) and supports external reference voltages from 2.9 V to 5.1 V. It delivers 99.7 dB dynamic range and −110.5 dB THD at 1 kHz for high-fidelity data acquisition in precision instrumentation.

For engineers reviewing the AD7984BCPZ-RL7 datasheet, AD7984BCPZ-RL7 pinout, AD7984BCPZ-RL7 application, or AD7984BCPZ-RL7 equivalent, key selection criteria include guaranteed no missing codes, INL ≤ ±2.25 LSB, 10.5 mW total power at full throughput, 10-lead LFCSP package with exposed paddle, and daisy-chain capability for multi-channel systems without FPGA resource overhead.

Technical Context

The AD7984BCPZ-RL7 implements a charge redistribution SAR architecture with on-chip track-and-hold, eliminating pipeline delay and enabling deterministic timing for real-time control loops. Its conversion is initiated by the rising edge of CNV, and the result is available within 500 ns-no internal clock dependency on SCK.

It supports two interface modes: CS mode (using SDI or CNV as chip select) and chain mode (SDI low at CNV edge), both with optional busy indicator. The dual-supply design isolates analog core (V_DD) from digital I/O (V_IO), allowing interoperability with 1.8 V microcontrollers while maintaining 18-bit integrity.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	18-bit with no missing codes-ensures monotonicity and unambiguous code mapping across full scale.
Throughput Rate	1.33 MSPS at V_IO > 2.3 V-supports real-time sampling of signals up to ~600 kHz Nyquist bandwidth.
INL	±2.25 LSB max-limits absolute measurement error to ±0.0085% of full scale with 5 V reference.
Dynamic Range	99.7 dB at V_REF = 5 V-enables detection of signals 10× smaller than noise floor in medical ECG front-ends.
Total Power	10.5 mW at 1.33 MSPS-achieves 7.9 nJ/conversion efficiency for battery-sensitive portable DAQ.
Analog Input Range	True differential ±V_REF, with common-mode centered at V_REF/2-rejects even-order harmonics and enables direct connection to ADA4941 differential drivers.
Reference Voltage	2.9 V to 5.1 V externally supplied-decouples accuracy from supply rail, supporting ratiometric or precision fixed-reference topologies.

Pinout & Package

AD7984BCPZ-RL7 is housed in a 10-lead, 3 mm × 3 mm LFCSP package (CP-10-9) with exposed thermal paddle. Pin 1 is REF; pin 5 is GND; pin 6 is CNV; pin 10 is V_IO. The exposed paddle must be connected to GND for optimal thermal performance (θ_JA = 48.7°C/W) and EMI suppression.

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 stability and noise rejection.
V_DD (Pin 2)	Analog core supply	2.375–2.625 V only; powers SAR array and comparator-must be filtered independently from digital rails.
IN+ / IN− (Pins 3, 4)	Differential analog inputs	Accept true differential signal swing of ±V_REF; common-mode range is V_REF × 0.475 to V_REF × 0.525-optimized for driven sources like ADA4941.
GND (Pin 5)	Analog ground reference	Single-point return for REF, IN+, IN−, and V_DD; must be isolated from digital ground except at system star point.
CNV (Pin 6)	Convert trigger & mode select	Rising edge initiates sampling; logic level at CNV edge selects CS vs. chain interface mode-no external clock required for conversion.
SDO (Pin 7)	Serial data output	18-bit twos-complement output synchronized to SCK falling edge; tri-state when CNV/SDI high in CS mode.
SCK (Pin 8)	Serial clock input	Accepts 1.8–5 V logic; minimum period 10.5 ns (V_IO > 4.5 V)-controls data readout timing but not conversion timing.
SDI (Pin 9)	Serial data input / mode control	Configures interface mode (CS/chain) on CNV edge; in chain mode, passes upstream ADC data with 18-cycle delay.
V_IO (Pin 10)	Digital I/O supply	1.71–5.5 V-sets logic thresholds for all digital pins; enables direct interfacing with mixed-voltage host processors.

Key Features

Feature	Design Value
Zero-latency architecture	Conversion result available immediately after CNV rising edge-eliminates pipeline delay for closed-loop feedback timing predictability.
Daisy-chain capability	Supports cascading ≥2 AD7984BCPZ-RL7 units on single 3-wire bus-reduces GPIO count and PCB routing complexity in multi-channel systems.
Separate V_IO supply	Enables 1.8 V MCU interfacing while maintaining 2.5 V analog core-preserves SNR and avoids level-shifter components.
Wide reference voltage range	2.9 V–5.1 V external REF-allows optimization of dynamic range vs. power trade-off (e.g., 2.9 V REF reduces power by ~25% vs. 5 V).
Low acquisition time	250 ns acquisition window-minimizes driver amplifier settling burden and supports high-Z sensor interfaces with minimal external buffering.

Applications

High-Speed Data Acquisition	Medical Diagnostic Equipment
Use Scenario: Simultaneous sampling of multiple sensor channels (e.g., strain gauges, accelerometers) in automated test equipment requiring sub-µs inter-channel skew. IC Role / Device Role / Timing Role: Primary SAR ADC capturing synchronized 18-bit samples at 1.33 MSPS with zero latency-enables real-time FFT analysis and pass/fail decisioning within one sample period. Use Value: Eliminates need for external FIFO or oversampling DSP-reduces BOM cost and firmware latency in production line testers.	Use Scenario: High-resolution waveform capture in portable ultrasound or EEG systems where power budget is constrained and signal fidelity is critical. IC Role / Device Role / Timing Role: Front-end digitizer for conditioned analog signals from transducer preamps-operates at 10.5 mW total power with 99.7 dB dynamic range. Use Value: Enables 16+ effective bits of resolution at clinical-grade SNR without active cooling or complex power sequencing.
Industrial Machine Monitoring	Precision Test & Measurement
Use Scenario: Vibration analysis of rotating machinery using piezoelectric sensors with wide dynamic range requirements (e.g., detecting bearing faults amid high-amplitude background noise). IC Role / Device Role / Timing Role: Differential input ADC rejecting common-mode noise from motor drives; accepts ±5 V inputs via external reference scaling. Use Value: Delivers −110.5 dB THD at 1 kHz-resolves harmonic sidebands below −100 dBc essential for predictive maintenance algorithms.	Use Scenario: Calibration-grade digitization in benchtop multimeters or source-measure units requiring traceable linearity and low gain drift. IC Role / Device Role / Timing Role: Metrology ADC with ±2.25 LSB INL and 0.6 ppm/°C gain drift-used with ovenized references and guarded PCB layouts. Use Value: Supports 6½-digit measurement accuracy without post-calibration software correction-reduces factory calibration time.

High-Speed Data Acquisition

Medical Diagnostic Equipment

Use Scenario: Simultaneous sampling of multiple sensor channels (e.g., strain gauges, accelerometers) in automated test equipment requiring sub-µs inter-channel skew.

IC Role / Device Role / Timing Role: Primary SAR ADC capturing synchronized 18-bit samples at 1.33 MSPS with zero latency-enables real-time FFT analysis and pass/fail decisioning within one sample period.

Use Value: Eliminates need for external FIFO or oversampling DSP-reduces BOM cost and firmware latency in production line testers.

Use Scenario: High-resolution waveform capture in portable ultrasound or EEG systems where power budget is constrained and signal fidelity is critical.

IC Role / Device Role / Timing Role: Front-end digitizer for conditioned analog signals from transducer preamps-operates at 10.5 mW total power with 99.7 dB dynamic range.

Use Value: Enables 16+ effective bits of resolution at clinical-grade SNR without active cooling or complex power sequencing.

Industrial Machine Monitoring

Precision Test & Measurement

Use Scenario: Vibration analysis of rotating machinery using piezoelectric sensors with wide dynamic range requirements (e.g., detecting bearing faults amid high-amplitude background noise).

IC Role / Device Role / Timing Role: Differential input ADC rejecting common-mode noise from motor drives; accepts ±5 V inputs via external reference scaling.

Use Value: Delivers −110.5 dB THD at 1 kHz-resolves harmonic sidebands below −100 dBc essential for predictive maintenance algorithms.

Use Scenario: Calibration-grade digitization in benchtop multimeters or source-measure units requiring traceable linearity and low gain drift.

IC Role / Device Role / Timing Role: Metrology ADC with ±2.25 LSB INL and 0.6 ppm/°C gain drift-used with ovenized references and guarded PCB layouts.

Use Value: Supports 6½-digit measurement accuracy without post-calibration software correction-reduces factory calibration time.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed precision SAR ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7982BCPZ-RL7	Pin-for-pin compatible; identical 18-bit/1.33 MSPS spec but lower dynamic range (98.5 dB) and higher THD (−105 dB).	Lower-cost alternative where 1.2 dB SNR margin is acceptable-common in industrial DAQ where ultimate medical-grade fidelity is unnecessary.	Select AD7982BCPZ-RL7 if BOM cost is prioritized over 99.7 dB dynamic range and THD < −110 dB is not required.
AD4003BRMZ	18-bit, 1 MSPS; lower power (7.5 mW), wider input range (±V_REF or 0–V_REF), but no daisy-chain support and slower throughput.	Better suited for low-power, single-channel portable instruments-lacks multi-ADC synchronization features of AD7984BCPZ-RL7.	Choose AD4003BRMZ when energy per conversion is critical and interface simplicity outweighs multi-device chaining.

Compared with AD7984BCPZ-RL7, AD7982BCPZ-RL7 offers identical footprint and timing but trades 1.2 dB dynamic range for lower cost, while AD4003BRMZ sacrifices throughput and daisy-chain capability to achieve 29% lower power-making each suitable for distinct segments of precision DAQ design.

Availability

AD7984BCPZ-RL7 is available at Aetrix Electronics and suitable for high-speed data acquisition systems, medical diagnostic equipment, industrial machine monitoring, and precision test & measurement instruments requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD7984BCPZ-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 Wilmington, MA.

The AD7984BCPZ-RL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered for applications demanding high resolution, fast throughput, and low power in space-constrained industrial and medical systems.

FAQ

What is the maximum recommended reference voltage for AD7984BCPZ-RL7?

The AD7984BCPZ-RL7 supports an external reference voltage from 2.9 V to 5.1 V. The maximum rated value is 5.1 V per Absolute Maximum Ratings (Table 6); operation above 5.1 V risks permanent damage. At 5.0 V, it achieves 99.7 dB dynamic range and 98.5 dB SNR-optimal for full-scale precision applications.

Does AD7984BCPZ-RL7 require an external clock for conversion?

No, AD7984BCPZ-RL7 does not require an external clock for conversion. It uses an on-chip conversion clock triggered by the CNV rising edge. The SCK signal is used only for serial data readout-not for sampling or conversion timing-enabling deterministic latency and simplifying system clock tree design.

Can AD7984BCPZ-RL7 interface directly with a 1.8 V microcontroller?

Yes, AD7984BCPZ-RL7 can interface directly with a 1.8 V microcontroller. Its V_IO pin accepts 1.71 V to 5.5 V, and digital input thresholds scale accordingly (e.g., VIH = 0.9 × V_IO). With V_IO = 1.8 V, logic high is recognized at ≥1.62 V-fully compatible with standard 1.8 V CMOS outputs without level shifters.

What is the thermal resistance (θ_JA) of the AD7984BCPZ-RL7 LFCSP package?

The AD7984BCPZ-RL7 in its 10-lead LFCSP (CP-10-9) package has a junction-to-ambient thermal resistance (θ_JA) of 48.7°C/W under JEDEC 2S2P board conditions. This value assumes proper PCB layout with the exposed paddle soldered to a thermal pad connected to internal ground planes-critical for maintaining T_J ≤ 125°C at full 10.5 mW dissipation.

Is AD7984BCPZ-RL7 pin-compatible with any other Analog Devices ADCs?

Yes, AD7984BCPZ-RL7 is pin-for-pin compatible with the AD7982BCPZ-RL7, sharing identical 10-lead MSOP and LFCSP footprints, pin functions, and interface protocol. This allows drop-in replacement where the AD7982's slightly lower dynamic range (98.5 dB) and higher THD (−105 dB) are acceptable-facilitating design reuse and second-source qualification.

AD7984BCPZ-RL7 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: PulSAR®

Package/Case:: 10-VFDFN Exposed Pad, CSP

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-LFCSP-WD (3x3)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AD7984BCPZ-RL7 FAQ

1.How can I place an order for AD7984BCPZ-RL7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7984BCPZ-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 AD7984BCPZ-RL7 reliable?

The price and inventory of AD7984BCPZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7984BCPZ-RL7 is usually 5 days.

3.What payment methods are accepted for AD7984BCPZ-RL7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7984BCPZ-RL7 transactions.

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4.How is shipping managed for AD7984BCPZ-RL7?

AD7984BCPZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7984BCPZ-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 AD7984BCPZ-RL7?

For technical support, including AD7984BCPZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7984BCPZ-RL7 requirements.

6.How does Aetrix verify that AD7984BCPZ-RL7 is sourced from the original manufacturer or authorized distributors?

All AD7984BCPZ-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 AD7984BCPZ-RL7 meets industry standards.

7.What is the process for return or replacement of AD7984BCPZ-RL7?

All AD7984BCPZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7984BCPZ-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 AD7984BCPZ-RL7 part is unused and in its original packaging.

Return procedure for AD7984BCPZ-RL7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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