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Analog Devices Inc. AD4021BRMZ
- Part No.:
- AD4021BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD4021BRMZ.pdf
- Description:
- IC ADC 20BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,149
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Product details
Overview
AD4021BRMZ from Analog Devices is a 20-bit, 1 MSPS differential successive approximation register (SAR) analog-to-digital converter with Easy Drive architecture, ±VREF input range (2.4 V–5.1 V reference), −40°C to +125°C operation, and integrated input overvoltage clamp. It enables high-accuracy data acquisition in precision instrumentation where low input current (≤1 µA at 1 MSPS) and long acquisition phase (770 ns) eliminate need for dedicated ADC drivers.
For engineers reviewing the AD4021BRMZ datasheet, AD4021BRMZ pinout, AD4021BRMZ application, or AD4021BRMZ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-ready availability details - all specific to the AD4021BRMZ variant's 1 MSPS throughput, MSOP-10/LFCSP-10 packaging, and guaranteed 20-bit no-missing-codes performance.
Technical Context
The AD4021BRMZ implements a single-supply SAR architecture with Easy Drive input stage that reduces dynamic input current to ≤1 µA during conversion at 1 MSPS and extends acquisition time to ≥77% of cycle time (770 ns). Its differential input accepts ±VREF spans up to ±5.1 V and supports span compression for single-supply amplifier interfacing without sacrificing full-code range.
It features a SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface with programmable modes (CS or daisy-chain), status bit reporting, and turbo mode enabling 1 MSPS throughput with minimal SCK rate requirements. Input overvoltage clamp sinks up to 50 mA per input while limiting REF disturbance and eliminating external protection diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit, guaranteed no missing codes - ensures full dynamic range utilization without code gaps in precision measurement systems. |
| Throughput Rate | 1 MSPS - supports accurate capture of signals up to ~400 kHz (−3 dB BW = 10 MHz) and enables oversampling for antialiasing relaxation. |
| INL Error | ±3.1 ppm max - translates to <±0.3 LSB error at 20 bits, critical for calibration-grade metrology and sensor front-ends. |
| SNR / THD | 100.5 dB SNR, −123 dB THD at 1 kHz - enables >16.5 ENOB for high-fidelity signal reconstruction in medical and test equipment. |
| Input Current | ≤1 µA at 1 MSPS (high-Z enabled) - eliminates need for high-output-current driver amplifiers, reducing power and board space. |
| Power Dissipation | 8.3 mW at 1 MSPS (VDD only), 10.8–13 mW total with high-Z enabled - supports thermally constrained, battery-powered, or multi-channel DAQ designs. |
| Reference Range | 2.4 V to 5.1 V - allows flexible system-level voltage scaling and compatibility with common precision references (e.g., ADR45xx). |
| Operating Temp | −40°C to +125°C - qualified for industrial automation, downhole tools, and automotive under-hood sensing applications. |
Pinout & Package
AD4021BRMZ is available in two 10-lead packages: 3 mm × 4.90 mm MSOP (RM-10) and 3 mm × 3 mm LFCSP (CP-10-9), both with exposed pad (EPAD) connected to GND. Pinout is identical across packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REF | Analog Reference Input | Accepts 2.4 V–5.1 V external reference; requires local 10 µF X7R decoupling to GND for stable conversion accuracy. |
| 2 VDD | Analog Power Supply | 1.71 V–1.89 V single analog rail; bypassed with 0.1 µF ceramic capacitor to minimize noise coupling into SAR core. |
| 3 IN+ | Differential Analog Input (+) | High-impedance input accepting ±VREF range; supports span compression to simplify single-supply driver design. |
| 4 IN− | Differential Analog Input (−) | Complements IN+; common-mode range centered at VREF/2 ±125 mV - defines usable input swing window. |
| 5 GND | Power Ground | Primary return path for analog and digital supplies; must connect to low-impedance ground plane for noise immunity. |
| 6 CNV | Convert Control Input | Edge-triggered start-of-conversion signal; selects interface mode (CS vs. daisy-chain) and enables SDO in CS mode when low. |
| 7 SDO | Serial Data Output | 20-bit twos-complement output synchronized to SCK; tri-stated when CNV/SDI high in CS mode. |
| 8 SCK | Serial Clock Input | Drives data shift-out timing; supports 1.8 V–5 V logic levels via VIO; minimum 80 MHz required for full 1 MSPS throughput. |
| 9 SDI | Serial Data Input | Configures interface mode on CNV rising edge (low = daisy-chain, high = CS); used for register writes in CS mode. |
| 10 VIO | Digital I/O Supply | Independent 1.71 V–5.5 V logic rail; isolates digital noise from analog section and enables mixed-voltage host interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive Input Architecture | Reduces input current to ≤1 µA at 1 MSPS and extends acquisition phase to 770 ns - removes need for high-speed, high-output-current op amps. |
| Input Span Compression | Shifts input range to 0.1×VREF to 0.9×VREF - enables use of single-supply amplifiers without negative rails while preserving full 20-bit code range. |
| Integrated Overvoltage Clamp | Sinks up to 50 mA per input (IN+/IN−) with 360 ns deactivation - protects against transient overvoltages and prevents REF pin disturbance. |
| Turbo Mode Interface | Enables 1 MSPS throughput with simplified 3- or 4-wire SPI protocol and optional status bits - reduces digital interface complexity and timing margin risk. |
| Wide Temperature Range | Specified performance from −40°C to +125°C - supports deployment in harsh environments including motor control, industrial PLCs, and energy metering. |
| Pin Compatibility | Drop-in compatible with AD4003/AD4007/AD4011 family - allows scalable resolution/throughput upgrades within same PCB layout. |
Applications
| Automated Test Equipment | Medical Imaging Front-End |
|---|---|
|
Use Scenario: High-channel-count parametric test systems capturing fast transient waveforms from DUTs with sub-ppm linearity requirements. IC Role / Device Role / Timing Role: Precision digitizer sampling at 1 MSPS with 100.5 dB SNR and ±3.1 ppm INL to validate semiconductor device specifications. Use Value: Eliminates external driver stages due to ≤1 µA input current, reducing BOM cost and thermal load in densely packed ATE racks. |
Use Scenario: CT/MRI analog front-end digitizing low-noise detector outputs requiring ultra-low distortion and high DC stability. IC Role / Device Role / Timing Role: 20-bit SAR ADC providing 131 dB oversampled dynamic range (OSR=1024) for improved image SNR and reduced quantization artifacts. Use Value: Input overvoltage clamp protects against ESD events during probe handling, avoiding costly field failures and recalibration cycles. |
| Battery-Powered Portable Instrumentation | Precision Industrial Process Monitoring |
|
Use Scenario: Handheld multimeters and portable oscilloscopes operating from single-cell Li-ion batteries with strict power budgets. IC Role / Device Role / Timing Role: Low-power 20-bit ADC consuming only 8.3 mW at 1 MSPS (VDD only), supporting >10-hour runtime on 2000 mAh battery. Use Value: Single 1.8 V analog supply and 1.71–5.5 V VIO enable direct connection to MCU I/O without level-shifting, simplifying power architecture. |
Use Scenario: Distributed temperature/pressure sensors in oil & gas or chemical plants requiring long-term accuracy and wide-temperature operation. IC Role / Device Role / Timing Role: Ruggedized ADC delivering guaranteed 20-bit no-missing-codes performance from −40°C to +125°C in uncontrolled enclosures. Use Value: Pin compatibility with AD4003/AD4007 allows seamless migration from 16-bit to 20-bit resolution without PCB redesign or firmware changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 20-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD4020BRMZ | Higher throughput (1.8 MSPS), identical pinout and feature set - requires faster SCK (≥71 MHz) and higher power (15–19 mW). | Preferred for systems needing >1 MSPS sampling (e.g., ultrasonic NDT, high-speed motor control feedback). | Select AD4020BRMZ only if 1.8 MSPS is required and host controller supports ≥71 MHz SCK; otherwise AD4021BRMZ offers optimal balance of speed, power, and timing margin. |
| AD4022BRMZ | Lower throughput (500 kSPS), same package and interface - consumes less power (2.7 mW VDD-only) and relaxes SCK timing (≥35 MHz). | Better suited for low-power, lower-bandwidth applications like environmental monitoring or static sensor arrays. | Choose AD4022BRMZ when sampling rate ≤500 kSPS suffices and ultra-low power (<3 mW) is critical; AD4021BRMZ provides 2× speed headroom for future scalability. |
Compared with AD4020BRMZ and AD4022BRMZ, the AD4021BRMZ delivers the optimal trade-off between throughput (1 MSPS), power efficiency (8.3 mW VDD-only), and relaxed digital interface timing - making it the preferred choice for mid-speed precision DAQ systems where robustness, ease of drive, and thermal efficiency are prioritized over maximum speed or minimum power alone.
Availability
AD4021BRMZ is available at Aetrix Electronics and suitable for automated test equipment, medical imaging subsystems, and precision industrial process monitoring requiring stable component supply, extended temperature qualification, and guaranteed 20-bit no-missing-codes performance.
Supply support for AD4021BRMZ 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, with design and manufacturing operations worldwide.
The AD4021BRMZ belongs to the AD402x family of Easy Drive 20-bit SAR ADCs, engineered specifically for precision data acquisition systems demanding low power, high channel density, and simplified analog front-end design without sacrificing accuracy or speed.
FAQ
What is the maximum achievable throughput for AD4021BRMZ and what conditions are required?
The AD4021BRMZ achieves a guaranteed 1 MSPS throughput when operated in turbo mode with a minimum SCK frequency of 80 MHz (for VIO < 2.7 V) or 100 MHz (for VIO ≥ 2.7 V). This rate is specified across −40°C to +125°C with VDD = 1.71–1.89 V, VREF = 5 V, and high-Z mode disabled. The AD4021BRMZ cannot reach 1.8 MSPS - that speed is exclusive to the AD4020BRMZ variant.
Does AD4021BRMZ require an external driver amplifier for its analog inputs?
No, the AD4021BRMZ does not require an external driver amplifier in most cases due to its Easy Drive architecture, which reduces input current to ≤1 µA at 1 MSPS and extends the acquisition phase to 770 ns. This allows direct connection to low-output-impedance sources such as precision voltage references or passive RC filters, significantly simplifying signal chain design compared to conventional SAR ADCs.
What reference voltage range is supported by AD4021BRMZ and how does it affect input span?
The AD4021BRMZ supports an external reference voltage (VREF) from 2.4 V to 5.1 V. With span compression disabled, the differential input range is ±VREF; with span compression enabled, it becomes ±0.8×VREF - shifting the usable range to 0.1×VREF to 0.9×VREF. This enables single-supply operation of companion amplifiers while retaining full 20-bit code utilization, a key advantage in battery-powered or isolated systems.
How does the input overvoltage clamp in AD4021BRMZ protect the system?
AD4021BRMZ integrates input overvoltage clamps on IN+ and IN− that sink up to 50 mA each when input voltage exceeds VREF + 0.25 V (e.g., 5.25 V at VREF = 5 V). The clamp deactivates within 360 ns after overvoltage removal and limits disturbance to the REF pin, eliminating the need for external Schottky diodes or TVS devices - improving reliability and reducing bill-of-materials cost in field-deployed equipment.
Is AD4021BRMZ pin-compatible with other members of the AD40xx family?
Yes, AD4021BRMZ is pin-compatible with the AD4003/AD4007/AD4011 family and shares identical 10-lead MSOP and LFCSP footprints with AD4020BRMZ and AD4022BRMZ. This enables drop-in replacement across throughput grades (500 kSPS/1 MSPS/1.8 MSPS) without PCB layout changes, facilitating scalable system design and inventory rationalization for manufacturers deploying multiple performance tiers.
AD4021BRMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 20
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- DSP, MICROWIRE™, QSPI™, and SPI™
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 1.71V ~ 1.89V
- Voltage - Supply, Digital:
- 1.71V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD4021BRMZ FAQ
1.How can I place an order for AD4021BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD4021BRMZ 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 AD4021BRMZ reliable?
The price and inventory of AD4021BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD4021BRMZ is usually 5 days.
3.What payment methods are accepted for AD4021BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD4021BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD4021BRMZ?
AD4021BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD4021BRMZ 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 AD4021BRMZ?
For technical support, including AD4021BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD4021BRMZ requirements.
6.How does Aetrix verify that AD4021BRMZ is sourced from the original manufacturer or authorized distributors?
All AD4021BRMZ 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 AD4021BRMZ meets industry standards.
7.What is the process for return or replacement of AD4021BRMZ?
All AD4021BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD4021BRMZ, 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 AD4021BRMZ part is unused and in its original packaging.
Return procedure for AD4021BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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