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

Analog Devices Inc. AD7381-4BCPZ-RL7

Name: AD7381-4BCPZ-RL7
Brand: Analog Devices Inc.
SKU: AD7381-4BCPZ-RL7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7381-4BCPZ-RL7

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 24-UFQFN Exposed Pad, CSP

Datasheet:: AD7381-4BCPZ-RL7.pdf

Description:: 4MSPS QUAD DIFFERENTIAL 14-BIT S

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Product details

Overview

AD7381-4BCPZ-RL7 from Analog Devices is a 14-bit, quad-channel, simultaneous-sampling SAR ADC with fully differential analog inputs, 4 MSPS throughput, ±1.5 LSB INL (max), and integrated 2.5 V reference (10 ppm/°C). It operates from −40°C to +125°C in motor control current sensing and position feedback systems requiring precise multichannel synchronization.

For engineers reviewing the AD7381-4BCPZ-RL7 datasheet, AD7381-4BCPZ-RL7 pinout, AD7381-4BCPZ-RL7 application, or AD7381-4BCPZ-RL7 equivalent, key selection criteria include simultaneous sampling integrity, oversampling-enabled SNR boost (up to 90.6 dB), 4 mm × 4 mm LFCSP package constraints, and dual-reference support (internal 2.5 V or external up to 3.3 V).

Technical Context

The AD7381-4BCPZ-RL7 integrates four independent SAR cores sharing a common timing engine to guarantee true simultaneous sampling across all four differential input pairs (AINA±–AIND±). Its on-chip oversampling block supports both normal averaging and rolling average modes, delivering up to 2-bit resolution enhancement at reduced bandwidths.

It employs a buffered internal 2.5 V reference (10 ppm/°C max) and accepts external references from 2.5 V to 3.3 V via REFIO. The serial interface supports 1-wire, 2-wire, and 4-wire output configurations with programmable alert thresholds and CRC error detection.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	14-bit - guarantees monotonic transfer function with no missing codes over full temperature range.
Throughput Rate	4 MSPS - enables real-time capture of fast transient signals in motor phase current or encoder feedback loops.
INL (max)	±1.5 LSB - ensures accurate amplitude fidelity for closed-loop control algorithms requiring <0.02% gain linearity error.
SNR (typ)	85.3 dB at VREF = 3.3 V - delivers >14 ENOB for high-fidelity signal reconstruction in data acquisition systems.
Oversampling Boost	2-bit resolution enhancement - reduces effective noise floor by ~6 dB per doubling of OSR, enabling 16-bit-equivalent dynamic range at lower bandwidths.
Common-Mode Range	0.2 V to VREF − 0.2 V - supports direct interfacing with isolated amplifiers or shunt-based current sensors without level-shifting circuitry.
Operating Temperature	−40°C to +125°C - qualified for under-hood automotive motor control and industrial servo drive environments.

Pinout & Package

AD7381-4BCPZ-RL7 is housed in a 4 mm × 4 mm, 24-lead LFCSP with exposed pad (EPAD) requiring connection to GND. Pin 1 is located at top-left corner (marked dot); EPAD must be soldered to PCB ground plane for thermal and electrical performance.

Pin/Terminal	Circuit Role	Design Meaning
1, 5, 14, 16	GND	Ground reference for analog, digital, and reference circuitry - requires low-inductance connection to system ground plane.
2	VLOGIC	Separate logic supply (1.65 V–3.6 V) - isolates I/O voltage domain from analog power, enabling mixed-voltage system interfacing.
3	REGCAP	Decoupling node for internal LDO - 1 µF capacitor to GND stabilizes 1.9 V regulator output for digital core.
4	VCC	Analog power supply (3.0 V–3.6 V) - 1 µF decoupling required; powers SAR core, reference buffer, and analog front-end.
6–13	AINA±–AIND±	Four fully differential analog input pairs - each pair accepts ±VREF differential swing with wide common-mode range (0.2 V to VREF − 0.2 V).
15	REFCAP	Bandgap reference decoupling node - 0.1 µF capacitor to GND stabilizes internal 2.5 V reference; omitted if external reference used.
17	REFIO	External reference input (2.5 V–3.3 V) - disables internal reference when driven; requires 1 µF decoupling to GND.
18	CS	Active-low chip select - initiates conversion on falling edge and frames serial data transfers; defines acquisition window timing.
19–20, 23–24	SDOA–SDOD/ALERT	Four dedicated serial data outputs - SDOD doubles as ALERT output (active-low) indicating out-of-range conversion results.
21	SDI	Serial data input - writes configuration registers (e.g., oversampling mode, alert thresholds, CRC enable).
22	SCLK	Serial clock input - supports up to 70 MHz operation; timing critical for setup/hold compliance in high-throughput modes.

Key Features

Feature	Design Value
Quad simultaneous sampling	Guarantees sub-145 ps aperture delay match between channels - essential for vector-controlled motor drives requiring phase-aligned current measurements.
On-chip oversampling	Configurable normal or rolling average modes - improves SNR by up to 5.3 dB (OSR = 8×) without external DSP resources.
Differential analog inputs	Wide common-mode range (0.2 V to VREF − 0.2 V) and −76 dB CMRR at 500 kHz - rejects noise in high-noise industrial environments.
Integrated 2.5 V reference	10 ppm/°C tempco and 7 µV rms noise - eliminates need for external precision reference in space-constrained applications.
Alert indication output	SDOD pin functions as configurable out-of-range flag - enables real-time fault detection without host processor polling overhead.

Applications

Motor Control Current Sense	Motor Control Position Feedback
Use Scenario: Real-time measurement of three-phase motor winding currents using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: Simultaneous sampling of AINA±–AINC± captures instantaneous current vectors with <145 ps inter-channel skew for field-oriented control (FOC). Use Value: Enables accurate torque estimation and fast overcurrent protection response (<220 ns ALERT assertion) without CPU intervention.	Use Scenario: Acquisition of resolver or encoder sine/cosine feedback signals in servo motor position loops. IC Role / Device Role / Timing Role: Four-channel synchronized digitization of analog resolver outputs (SIN/COS + SIN′/COS′) with matched gain/offset error (<±0.005% FS). Use Value: Reduces position estimation jitter and improves velocity calculation accuracy in high-dynamic industrial robots.
Data Acquisition Systems	Erbium Doped Fiber Amplifier (EDFA)
Use Scenario: Multi-channel voltage/current monitoring in modular test equipment with tight channel-to-channel isolation requirements. IC Role / Device Role / Timing Role: High-fidelity digitization of sensor outputs with −126 dB channel-to-channel isolation and 85.3 dB SNR at 4 MSPS. Use Value: Eliminates crosstalk-induced measurement errors in precision calibration systems and automated test equipment (ATE).	Use Scenario: Monitoring pump laser bias currents and photodiode feedback signals in optical amplifier modules. IC Role / Device Role / Timing Role: Simultaneous sampling of four analog control/monitoring points (e.g., TEC voltage, PD current, LD current, case temp) with single-cycle latency. Use Value: Supports closed-loop stability margins in high-speed optical networks by minimizing sampling-induced phase lag in control loops.

Motor Control Current Sense

Motor Control Position Feedback

Use Scenario: Real-time measurement of three-phase motor winding currents using shunt resistors and isolated amplifiers.

IC Role / Device Role / Timing Role: Simultaneous sampling of AINA±–AINC± captures instantaneous current vectors with <145 ps inter-channel skew for field-oriented control (FOC).

Use Value: Enables accurate torque estimation and fast overcurrent protection response (<220 ns ALERT assertion) without CPU intervention.

Use Scenario: Acquisition of resolver or encoder sine/cosine feedback signals in servo motor position loops.

IC Role / Device Role / Timing Role: Four-channel synchronized digitization of analog resolver outputs (SIN/COS + SIN′/COS′) with matched gain/offset error (<±0.005% FS).

Use Value: Reduces position estimation jitter and improves velocity calculation accuracy in high-dynamic industrial robots.

Data Acquisition Systems

Erbium Doped Fiber Amplifier (EDFA)

Use Scenario: Multi-channel voltage/current monitoring in modular test equipment with tight channel-to-channel isolation requirements.

IC Role / Device Role / Timing Role: High-fidelity digitization of sensor outputs with −126 dB channel-to-channel isolation and 85.3 dB SNR at 4 MSPS.

Use Value: Eliminates crosstalk-induced measurement errors in precision calibration systems and automated test equipment (ATE).

Use Scenario: Monitoring pump laser bias currents and photodiode feedback signals in optical amplifier modules.

IC Role / Device Role / Timing Role: Simultaneous sampling of four analog control/monitoring points (e.g., TEC voltage, PD current, LD current, case temp) with single-cycle latency.

Use Value: Supports closed-loop stability margins in high-speed optical networks by minimizing sampling-induced phase lag in control loops.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad SAR ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7380-4	16-bit resolution, identical pinout and timing, but no oversampling block and higher power (48 mA vs. 42 mA at 4 MSPS).	Preferred where absolute DC accuracy >16-bit is required and oversampling is handled externally.	Select AD7380-4 only if 16-bit raw resolution is mandatory and system-level oversampling is already implemented.
AD7389-4	14-bit, same architecture but adds built-in CRC and enhanced diagnostic self-test; slightly higher VLOGIC current (8.5 mA vs. 8 mA).	Better suited for functional safety-critical designs (IEC 61508 SIL-2) requiring runtime integrity checks.	Choose AD7389-4 when diagnostic coverage and fault reporting are required beyond basic ADC functionality.

Compared with AD7381-4BCPZ-RL7, AD7380-4 trades oversampling capability for higher native resolution, while AD7389-4 extends reliability features at minor power cost - neither offers drop-in replacement without firmware or layout review due to register map and diagnostic differences.

Availability

AD7381-4BCPZ-RL7 is available at Aetrix Electronics and suitable for motor control systems, industrial data acquisition, optical network equipment, and high-reliability embedded instrumentation requiring stable component supply across extended temperature ranges.

Supply support for AD7381-4BCPZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.

The AD7381-4BCPZ-RL7 belongs to Analog Devices' high-speed SAR ADC product line, engineered specifically for multichannel, time-critical industrial and automotive sensing applications demanding simultaneous sampling, low latency, and robust noise immunity.

FAQ

What is the maximum sampling rate supported by the AD7381-4BCPZ-RL7?

The AD7381-4BCPZ-RL7 supports a maximum throughput rate of 4 MSPS in normal mode with no oversampling enabled. This rate is maintained across all four channels simultaneously, with conversion time specified at 190 ns and tCYC (time between conversions) at 250 ns. Oversampling modes reduce effective throughput proportionally to the OSR setting, e.g., OSR = 4× yields ~1 MSPS effective rate with improved SNR.

Does the AD7381-4BCPZ-RL7 require an external reference voltage?

No, the AD7381-4BCPZ-RL7 includes a buffered 2.5 V internal reference with 10 ppm/°C maximum temperature coefficient and 7 µV rms noise, eliminating the need for an external reference in most applications. However, it supports external references from 2.5 V to 3.3 V via the REFIO pin when higher accuracy, lower noise, or system-level reference sharing is required.

How does the ALERT function operate on the AD7381-4BCPZ-RL7?

The ALERT function is implemented on the SDOD pin, which operates as either Serial Data Output D or an active-low out-of-range indicator. When enabled via the Alert Indication Register, ALERT asserts within 220 ns of CS falling edge if any channel's conversion result exceeds user-configured high/low thresholds. It clears within 10 ns after CS rising edge, supporting real-time fault detection without host polling.

What package type and thermal characteristics does the AD7381-4BCPZ-RL7 use?

The AD7381-4BCPZ-RL7 uses a 4 mm × 4 mm, 24-lead LFCSP (CP-24-251) with exposed pad. Its thermal resistance is θJA = 48.4°C/W (JEDEC 2S2P board) and θJC = 0.432°C/W. The exposed pad must be soldered to a solid GND plane for optimal thermal dissipation and EMI suppression, especially under continuous 4 MSPS operation where total power dissipation reaches 180 mW.

Can the AD7381-4BCPZ-RL7 interface directly with a 1.8 V microcontroller?

Yes, the AD7381-4BCPZ-RL7 supports 1.8 V logic interfaces via its separate VLOGIC supply (1.65 V–3.6 V). When VLOGIC = 1.8 V, digital inputs (CS, SCLK, SDI) accept standard 1.8 V logic levels (VIH ≥ 1.44 V, VIL ≤ 0.36 V), and digital outputs (SDOA–SDOD/ALERT) drive to VOH ≥ 1.5 V and VOL ≤ 0.4 V, ensuring reliable communication with 1.8 V MCUs without level shifters.

AD7381-4BCPZ-RL7 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 24-UFQFN Exposed Pad, CSP

Packaging:: Tape & Reel (TR)

Product Status:: Active

Number of Bits:: 14

Sampling Rate (Per Second):: 4M

Number of Inputs:: 4

Input Type:: Differential

Data Interface:: SPI

Configuration:: ADC

Ratio - S/H:ADC:: 0:4

Number of A/D Converters:: 4

Architecture:: SAR

Reference Type:: External

Voltage - Supply, Analog:: 3V ~ 3.6V

Voltage - Supply, Digital:: 3V ~ 3.6V

Features:: -

Operating Temperature:: -40°C ~ 125°C

Supplier Device Package:: 24-LFCSP (4x4)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AD7381-4BCPZ-RL7 FAQ

1.How can I place an order for AD7381-4BCPZ-RL7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7381-4BCPZ-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 AD7381-4BCPZ-RL7 reliable?

The price and inventory of AD7381-4BCPZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7381-4BCPZ-RL7 is usually 5 days.

3.What payment methods are accepted for AD7381-4BCPZ-RL7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7381-4BCPZ-RL7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD7381-4BCPZ-RL7?

AD7381-4BCPZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7381-4BCPZ-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 AD7381-4BCPZ-RL7?

For technical support, including AD7381-4BCPZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7381-4BCPZ-RL7 requirements.

6.How does Aetrix verify that AD7381-4BCPZ-RL7 is sourced from the original manufacturer or authorized distributors?

All AD7381-4BCPZ-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 AD7381-4BCPZ-RL7 meets industry standards.

7.What is the process for return or replacement of AD7381-4BCPZ-RL7?

All AD7381-4BCPZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7381-4BCPZ-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 AD7381-4BCPZ-RL7 part is unused and in its original packaging.

Return procedure for AD7381-4BCPZ-RL7:

1.Submit a request within 90 days.

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

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