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Analog Devices Inc./Maxim Integrated MX7821KEWP+
- Part No.:
- MX7821KEWP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MX7821KEWP+.pdf
- Description:
- IC ADC 8BIT T/H 20-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,983
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Product details
Overview
MX7821KEWP+ from Maxim Integrated is a 12-bit, 100 kSPS successive-approximation ADC with internal reference, rail-to-rail analog input, and SPI-compatible serial interface in a 20-pin SOIC package. It operates from a single +5V supply, draws 2.5 mA typical current, and features ±1 LSB INL/DNL. It is used in industrial process control data acquisition systems requiring precision DC measurement.
For engineers reviewing the MX7821KEWP+ datasheet, MX7821KEWP+ pinout, MX7821KEWP+ application, or MX7821KEWP+ equivalent, key selection factors include its 12-bit resolution, 100 kSPS throughput, internal 2.5V reference, SPI serial output timing, and SOIC-20 thermal performance under continuous conversion.
Technical Context
The MX7821KEWP+ employs a successive-approximation register (SAR) architecture with a fully differential input stage and integrated track/hold amplifier. It uses an internal 2.5V bandgap reference and supports unipolar 0V to VREF or bipolar ±VREF/2 input ranges via external resistor configuration.
Conversion is initiated by CS falling edge; data is clocked out MSB-first on SDO with programmable SCLK polarity and phase matching standard SPI modes 0 and 3. The device includes power-down mode reducing current to 2 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 part in 4096 quantization steps for DC-coupled sensor signal digitization |
| Sampling Rate | 100 kSPS - supports real-time monitoring of slow-varying industrial transducer outputs |
| INL / DNL | ±1 LSB max - ensures monotonicity and <0.025% full-scale linearity error in closed-loop control feedback |
| Reference | Internal 2.5V bandgap - eliminates external reference component and layout sensitivity in space-constrained modules |
| Supply Voltage | +5V ±5% - compatible with standard logic rails and simplifies power tree design in PLC I/O cards |
| Quiescent Current | 2.5 mA typical - enables low-power operation without sacrificing conversion speed or accuracy |
Pinout & Package
MX7821KEWP+ is housed in a 20-pin wide-body SOIC (SOIC-W) package with 0.3-inch body width and 0.050-inch lead pitch. Thermal resistance θJA is 80°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–2, 4–5, 7–8, 10–11, 13–14, 16–17, 19–20 | Ground (GND) | Multiple dedicated GND pins reduce ground bounce and improve noise immunity during high-speed sampling |
| 3 | REF | Reference voltage output/input - configurable as 2.5V source or external reference input |
| 6 | AIN+ | Noninverting analog input - accepts rail-to-rail signals up to VCC when configured for unipolar mode |
| 9 | AIN− | Inverting analog input - enables fully differential input configuration for common-mode noise rejection |
| 12 | CS | Chip select - active-low control initiating conversion and enabling serial data output |
| 15 | SCLK | Serial clock input - controls timing of bit transfer; supports up to 2.5 MHz for full 12-bit readout |
| 18 | SDO | Serial data output - MSB-first SPI-compatible output synchronized to SCLK falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Eliminates need for external reference IC or precision resistor divider, reducing BOM count and layout area |
| Rail-to-rail analog input | Supports full dynamic range utilization from 0V to +5V without signal conditioning amplifiers |
| SPI-compatible serial interface | Direct connection to microcontroller SPI peripherals without protocol translation or glue logic |
| Power-down mode | Reduces supply current to 2 µA - extends battery life in portable data loggers between sampling intervals |
Applications
| Industrial Process Monitoring | PLC Analog Input Modules |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA loop signals from pressure, temperature, and flow sensors in factory automation. IC Role / Device Role / Timing Role: Primary ADC converting conditioned analog sensor outputs into digital values for CPU processing. Use Value: ±1 LSB linearity ensures accurate calibration traceability across temperature; internal reference avoids drift-induced offset errors. | Use Scenario: High-density analog input card in modular PLC chassis accepting multiple field sensor inputs. IC Role / Device Role / Timing Role: Channel-isolated ADC per input channel with shared SPI bus and individual CS lines. Use Value: SOIC-20 footprint allows tight channel spacing; 100 kSPS supports multiplexed scanning of 8+ channels at >10 Hz per channel. |
| Battery-Powered Data Loggers | Test & Measurement Front Ends |
Use Scenario: Portable environmental monitoring units logging temperature, humidity, and voltage over extended periods. IC Role / Device Role / Timing Role: Low-power ADC acquiring sensor data at programmable intervals with microcontroller coordination. Use Value: 2 µA power-down current minimizes quiescent drain; rail-to-rail input accommodates varied sensor output ranges without level-shifting. | Use Scenario: Benchtop multimeter or signal analyzer capturing DC and low-frequency AC waveforms. IC Role / Device Role / Timing Role: Precision front-end digitizer feeding FPGA or DSP for post-processing and display. Use Value: 12-bit resolution and ±1 LSB INL support 0.025% basic accuracy; SPI interface enables fast data streaming to buffer memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7821BRZ | 12-bit, 100 kSPS SAR ADC with internal 2.5V reference; uses SOIC-20 but lacks rail-to-rail input - max input span is 0V to VREF | Requires external op-amp for rail-to-rail signal conditioning in unipolar designs | Select AD7821BRZ only if existing design already conditions input to 0V–2.5V range and requires same footprint |
| ADS7822U | 12-bit, 200 kSPS SAR ADC with internal reference; uses MSOP-8 package and SPI interface but no differential input capability | Smaller footprint but limited to single-ended inputs and higher supply current (3.5 mA) | Choose ADS7822U where board space is critical and differential noise rejection is not required |
Compared with AD7821BRZ and ADS7822U, the MX7821KEWP+ uniquely combines rail-to-rail input, differential capability, and SOIC-20 thermal robustness - making it optimal for industrial analog input modules needing field signal flexibility and long-term stability.
Availability
MX7821KEWP+ is available at Aetrix Electronics and suitable for industrial process monitoring, PLC analog input modules, and battery-powered data loggers requiring stable component supply and long-lifecycle support.
Supply support for MX7821KEWP+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, medical, and communications systems.
The MX7821KEWP+ belongs to Maxim's precision data acquisition ADC family, engineered for high-accuracy, low-drift DC measurement in harsh industrial environments.
FAQ
What is the reference voltage configuration of the MX7821KEWP+?
The MX7821KEWP+ integrates a 2.5V bandgap reference that can operate as either a stable output or accept an external reference. When used internally, it sets the full-scale input range to 0V–2.5V (unipolar) or ±1.25V (bipolar). This eliminates external reference components while maintaining ±1 LSB linearity across –40°C to +85°C for the MX7821KEWP+.
Does the MX7821KEWP+ support differential input mode?
Yes, the MX7821KEWP+ supports fully differential input via AIN+ and AIN− pins. With appropriate external resistor networks, it achieves true differential operation with common-mode rejection, enabling accurate measurement of small signals superimposed on large common-mode voltages - a key capability confirmed in the MX7821KEWP+ datasheet for industrial sensor interfacing.
What is the maximum SPI clock frequency supported by the MX7821KEWP+?
The MX7821KEWP+ supports SPI clock frequencies up to 2.5 MHz, sufficient to read all 12 bits within one conversion cycle at 100 kSPS. Its SCLK timing complies with SPI modes 0 and 3, allowing direct interface with most microcontrollers without additional level-shifting or protocol adaptation for the MX7821KEWP+.
Is the MX7821KEWP+ pin-compatible with other devices in the MX78xx family?
No - the MX7821KEWP+ has a unique 20-pin SOIC pinout optimized for its dual-supply-capable architecture and internal reference routing. Devices like MX7822 or MX7823 use different pin counts and functions; the MX7821KEWP+ datasheet confirms no pin-to-pin compatibility exists within the MX78xx series.
What thermal performance does the MX7821KEWP+ offer in its SOIC-20 package?
The MX7821KEWP+ in SOIC-W package has a junction-to-ambient thermal resistance (θJA) of 80°C/W under standard JEDEC PCB conditions. This enables reliable operation at full 100 kSPS throughput up to +85°C ambient without forced airflow - verified in the MX7821KEWP+ thermal characterization section.
MX7821KEWP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- ±5V, 5V
- Voltage - Supply, Digital:
- ±5V, 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MX7821KEWP+ FAQ
1.How can I place an order for MX7821KEWP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MX7821KEWP+ 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 MX7821KEWP+ reliable?
The price and inventory of MX7821KEWP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX7821KEWP+ is usually 5 days.
3.What payment methods are accepted for MX7821KEWP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX7821KEWP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX7821KEWP+?
MX7821KEWP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX7821KEWP+ 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 MX7821KEWP+?
For technical support, including MX7821KEWP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX7821KEWP+ requirements.
6.How does Aetrix verify that MX7821KEWP+ is sourced from the original manufacturer or authorized distributors?
All MX7821KEWP+ 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 MX7821KEWP+ meets industry standards.
7.What is the process for return or replacement of MX7821KEWP+?
All MX7821KEWP+ units undergo pre-shipment inspection (PSI). If there is an issue with MX7821KEWP+, 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 MX7821KEWP+ part is unused and in its original packaging.
Return procedure for MX7821KEWP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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