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Analog Devices Inc./Maxim Integrated MAX1231EVC16
- Part No.:
- MAX1231EVC16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- Datasheet:
-
MAX1231EVC16.pdf
- Description:
- EVAL KIT FOR MAX1231
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Product details
Overview
MAX1231EVC16 from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor, internal 2.5V reference, and 16-entry FIFO. It supports 16 single-ended or 8 true differential input channels in unipolar/bipolar modes, operates from a +3V supply, and interfaces via 10MHz SPI/QSPI/MICROWIRE. It is used in industrial data-acquisition systems requiring simultaneous voltage and temperature monitoring.
For engineers reviewing the MAX1231EVC16 datasheet, MAX1231EVC16 pinout, MAX1231EVC16 application, or MAX1231EVC16 equivalent, key selection considerations include its 16-channel count, ±1 LSB INL/DNL accuracy, internal temperature sensing (±0.7°C at +25°C), FIFO buffering for burst acquisition, and compatibility with low-power embedded control architectures.
Technical Context
The MAX1231EVC16 employs a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold, enabling both single-ended and true differential conversions. Its internal oscillator supports clock modes 00/01/10 (4.4MHz ±10%), while external SCLK up to 10MHz enables 300ksps sampling in mode 11.
It integrates a dedicated temperature-sensing path using the same internal reference and SAR core, delivering results in two's complement format at 1/8°C resolution. The 16-deep FIFO buffers conversion results-including temperature-allowing autonomous multi-channel acquisition without serial bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise analog measurement |
| Sampling Rate | 300ksps maximum - supports high-speed transient capture in industrial monitoring |
| INL / DNL | ±1 LSB - ensures monotonicity and no missing codes across -40°C to +85°C |
| Temperature Accuracy | ±0.7°C at +25°C - enables reliable thermal feedback without external calibration |
| Reference | Internal 2.5V ±0.8% - eliminates need for external reference component and associated layout area |
| Interface | 10MHz 3-wire SPI/QSPI/MICROWIRE - compatible with standard microcontroller peripherals without protocol translation |
| Supply Current | 1.75mA at 300ksps - enables battery-operated or energy-constrained system designs |
Pinout & Package
The MAX1231EVC16 is packaged in a 28-pin 5mm × 5mm TQFN with exposed pad (EP), requiring connection of EP to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN15 | Analog Input Channels | 16 configurable inputs supporting single-ended or true differential pairs (e.g., AIN0/AIN1); AIN12–AIN15 available only on MAX1231 |
| REF+/REF- | Reference Inputs | REF+ accepts 1.0V to VDD+50mV; REF- serves as negative reference or alternate analog input (AIN14/AIN10/AIN6) |
| CNVST/AIN15 | Conversion Start / Analog Input | Active-low hardware trigger for conversion; multiplexed with AIN15 - only one function enabled per configuration |
| SCLK, DIN, DOUT, CS | Serial Interface Signals | Standard 3-wire SPI-compatible interface; DOUT active on SCLK falling edge; CS enables tri-state output |
| EOC | End-of-Conversion Flag | Active-low open-drain signal indicating result validity; behavior varies by clock mode (e.g., pulses per conversion in mode 01) |
| VDD, GND, EP | Power & Ground | +2.7V to +3.6V operation; EP must be soldered to GND plane for thermal dissipation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Temperature Sensor | ±0.7°C accuracy at +25°C with 1/8°C digital resolution - enables dual-function (voltage + temp) sensing without external IC |
| 16-Entry FIFO Buffer | Stores up to 16 ADC results plus one temperature reading - decouples acquisition from host read timing, reducing firmware overhead |
| Configurable Input Architecture | Supports 16 SE or 8 true differential channels with programmable unipolar/bipolar range - adapts to diverse sensor signal types (4–20mA, thermocouple, RTD conditioning) |
| AutoShutdown™ Mode | Reduces supply current to ≤5µA during idle - extends battery life in portable data loggers and remote sensors |
| Internal 2.5V Reference | ±30ppm/°C drift and 200µVRMS noise - provides stable scaling without external reference IC or trimming components |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of pressure, flow, and temperature signals from multiple field transmitters in PLC-based control cabinets. IC Role / Device Role / Timing Role: Central ADC managing 16 sensor inputs with synchronized sampling and on-chip temperature compensation. Use Value: Eliminates external multiplexer and reference, reducing BOM count and PCB area while maintaining ±1 LSB linearity over extended temperature range. |
Use Scenario: Multi-parameter bedside monitor acquiring ECG leads, respiration impedance, and skin temperature simultaneously. IC Role / Device Role / Timing Role: High-accuracy, low-noise ADC with integrated temp sensor for patient thermal baseline tracking alongside biopotential signals. Use Value: Single-chip solution meets IEC 60601-1 leakage current limits and provides calibrated temperature data without additional sensor calibration effort. |
| Data Logging in Harsh Environments | Automated Test Equipment (ATE) Front-End |
Use Scenario: Ruggedized environmental logger deployed in outdoor substations measuring voltage, current, and ambient temperature over -40°C to +85°C. IC Role / Device Role / Timing Role: Low-power ADC with AutoShutdown and internal reference ensuring stable operation during intermittent wake-up cycles. Use Value: 1.75mA active current and <5µA shutdown current enable multi-year battery life; internal FIFO prevents data loss during MCU sleep states. |
Use Scenario: Modular ATE slot card digitizing DC bias voltages and sensor feedback from DUTs under test. IC Role / Device Role / Timing Role: Precision ADC providing traceable 12-bit measurements with scan-mode sequencing and internal averaging for noise reduction. Use Value: Internal averaging (up to 64 samples) and ±1 LSB DNL enable repeatable sub-LSB repeatability without external DSP resources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 12-bit, 1MSPS, 16-channel, SPI interface; no integrated temp sensor; requires external reference | Better speed but lacks on-chip temperature sensing and internal reference | Select when higher throughput is critical and external reference/layout area is acceptable |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, parallel/SPI; no FIFO; no temp sensor; 2.7–5.25V supply | Higher speed and wider supply range, but no FIFO buffering or thermal monitoring capability | Choose for legacy parallel-interface systems or where FIFO autonomy is not required |
Compared with ADS7953IRHBT and AD7490BRUZ, the MAX1231EVC16 uniquely combines 16-channel count, integrated temperature sensing, internal reference, and FIFO in a single +3V device - simplifying design for space-constrained, thermally aware data-acquisition nodes where 300ksps is sufficient.
Availability
MAX1231EVC16 is available at Aetrix Electronics and suitable for industrial process monitoring, medical vital sign acquisition, environmental data logging, and automated test equipment requiring stable component supply across extended temperature ranges.
Supply support for MAX1231EVC16 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX1231EVC16 belongs to Maxim's precision data-acquisition ADC family, designed specifically for embedded systems needing integrated signal conditioning, multichannel scanning, and thermal awareness without external support components.
FAQ
What is the maximum sampling rate of the MAX1231EVC16, and under what conditions is it achieved?
The MAX1231EVC16 achieves a maximum sampling rate of 300ksps when operating in externally clocked mode (CKSEL = 11) with SCLK up to 10MHz and CS held high between 8-clock cycles. This rate assumes unipolar single-ended conversions with no internal averaging or temperature measurement enabled. Internal clock modes limit throughput to ~220ksps due to oscillator tolerance and acquisition timing constraints. The MAX1231EVC16 maintains full 12-bit accuracy at this rate with SINAD ≥71dB.
Does the MAX1231EVC16 require an external reference, or can it operate with its internal reference?
The MAX1231EVC16 can operate with either its internal 2.5V reference (2.48V to 2.52V, ±30ppm/°C TC) or an external differential reference applied to REF+ and REF-. Internal reference mode eliminates external component count and layout complexity, while external reference mode allows user-defined full-scale range and improved long-term stability. Temperature measurements always use the internal reference, regardless of voltage conversion configuration. The MAX1231EVC16 automatically selects reference source based on REFSEL bits in the setup register.
How many analog input channels does the MAX1231EVC16 support, and how are they configured?
The MAX1231EVC16 supports 16 single-ended analog inputs (AIN0–AIN15) or 8 true differential pairs (e.g., AIN0/AIN1, AIN2/AIN3, up to AIN14/AIN15). Configuration is performed via the setup and conversion registers: DIFFSEL bits select differential mode per pair, while CHSEL and SCAN bits define channel sequence and scan depth. AIN12–AIN15 are exclusive to the MAX1231 series and unavailable on MAX1227/MAX1229. The MAX1231EVC16's pinout maps all 16 channels to dedicated pins in the 28-pin TQFN package.
What is the function and accuracy of the internal temperature sensor in the MAX1231EVC16?
The MAX1231EVC16 integrates a factory-calibrated temperature sensor with ±0.7°C accuracy at +25°C and ±1.2°C over the full –40°C to +85°C operating range. It outputs results in two's complement format at 1/8°C resolution (e.g., 0x0100 = +32°C). The sensor shares the ADC core and internal reference, requiring no external components. Measurement time is 55µs, and readings are stored in the FIFO alongside voltage conversions. This enables simultaneous thermal monitoring and analog input acquisition within a single IC - a capability not present in most competing 12-bit ADCs.
Can the MAX1231EVC16 operate from a 3.3V supply, and what is its typical supply current?
Yes, the MAX1231EVC16 operates from a +2.7V to +3.6V supply, making 3.3V fully compliant. At VDD = 3.3V, fSAMPLE = 300ksps, and using the internal reference, typical supply current is 1.75mA. In AutoShutdown™ mode, current drops to ≤5µA. Supply current scales with sampling rate (e.g., 1.05mA at 0ksps with internal reference enabled) and is independent of digital interface activity. The MAX1231EVC16's low-power design supports battery-powered instrumentation and energy-efficient industrial nodes.
MAX1231EVC16 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of A/D Converters:
- 1
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 300k
- Data Interface:
- Serial
- Input Range:
- ±VREF/2
- Power (Typ) @ Conditions:
- 1.86mW @ 300kSPS
- Utilized IC / Part:
- MAX1231
- Contents:
- Board(s)
MAX1231EVC16 FAQ
1.How can I place an order for MAX1231EVC16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1231EVC16 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 MAX1231EVC16 reliable?
The price and inventory of MAX1231EVC16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1231EVC16 is usually 5 days.
3.What payment methods are accepted for MAX1231EVC16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1231EVC16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1231EVC16?
MAX1231EVC16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1231EVC16 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 MAX1231EVC16?
For technical support, including MAX1231EVC16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1231EVC16 requirements.
6.How does Aetrix verify that MAX1231EVC16 is sourced from the original manufacturer or authorized distributors?
All MAX1231EVC16 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 MAX1231EVC16 meets industry standards.
7.What is the process for return or replacement of MAX1231EVC16?
All MAX1231EVC16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1231EVC16, 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 MAX1231EVC16 part is unused and in its original packaging.
Return procedure for MAX1231EVC16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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