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Analog Devices Inc./Maxim Integrated MAX1243BESA+
- Part No.:
- MAX1243BESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1243BESA+.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:890
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Product details
Overview
MAX1243BESA+ from Maxim Integrated is a low-power, 10-bit successive-approximation analog-to-digital converter (ADC) with 73ksps throughput, 7.5µs conversion time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It operates from a single +2.7V to +5.25V supply, requires an external reference (0V to VREF input range), and is housed in an 8-pin SO package - ideal for space-constrained remote sensor nodes and portable data loggers.
For engineers reviewing the MAX1243BESA+ datasheet, MAX1243BESA+ pinout, MAX1243BESA+ application, or MAX1243BESA+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support details specific to the -40°C to +85°C industrial-grade SO-8 variant.
Technical Context
The MAX1243BESA+ implements a track/hold circuit with 1.5µs acquisition time and a 10-bit SAR core clocked internally, eliminating need for external conversion timing control. Its 3-wire serial interface uses unipolar MSB-first output format with EOC signaling via DOUT high transition, supporting up to 2.1MHz SCLK and compatible with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols.
It accepts external reference voltages from 1.0V to VDD, with REF input impedance ≥18kΩ and ≤10Ω output impedance requirement during conversion. Shutdown mode reduces supply current to ≤2µA (VDD ≤3.6V), and wake-up time is ~4µs when external reference remains active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes over full-scale input range |
| Sampling Rate | 73ksps - supports real-time monitoring of signals up to ~36.5kHz Nyquist bandwidth |
| Conversion Time | 7.5µs - fixed internal timing enables deterministic latency for closed-loop control |
| Power Consumption | 3mW at 73ksps (VDD = 3V) - enables battery operation in portable instrumentation |
| Reference Input | External only (0V to VREF), VREF = 1.0V to VDD - allows flexible scaling and precision system-level referencing |
| INL Error | ±1 LSB (max) - ensures monotonicity and <0.1% full-scale linearity error across -40°C to +85°C |
| Supply Range | +2.7V to +5.25V - interoperable with 3.3V and 5V logic domains without level-shifting |
Pinout & Package
MAX1243BESA+ is packaged in an 8-pin SO (Small Outline) surface-mount package, RoHS-compliant, with gull-wing leads and standard JEDEC MO-153 footprint (outline 21-0041). Thermal performance supports 471mW continuous dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | Accepts +2.7V to +5.25V; powers analog and digital sections; bypass required near pin |
| AIN (Pin 2) | Analog input | Unipolar 0V to VREF sampling node; protected to GND −0.3V / VDD +0.3V; 16pF input capacitance |
| SHDN (Pin 3) | Three-level shutdown control | Pull low for ≤2µA shutdown; high or open for active mode; no internal reference enable (MAX1242-only function) |
| REF (Pin 4) | External reference input | Accepts 1.0V–VDD reference; requires ≥0.1µF ceramic bypass; supports ≤10Ω source impedance during conversion |
| GND (Pin 5) | Analog/digital common ground | Single ground plane required; separates analog and digital return paths internally |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance tri-state |
| SCLK (Pin 8) | Serial clock input | Drives data shift-out; supports up to 2.1MHz; duty cycle unrestricted if ≥200ns per phase |
| DOUT (Pin 6) | Serial data output | MSB-first unipolar format; EOC signaled by rising edge; transitions on SCLK falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates dual-rail supplies and simplifies power architecture in embedded systems |
| Low-power shutdown | ≤2µA (VDD ≤3.6V) - extends battery life in intermittent-sampling applications like environmental sensors |
| On-chip track/hold | 1.5µs acquisition time - removes need for external sample-and-hold circuitry and reduces BOM count |
| 3-wire serial interface | SPI/QSPI/MICROWIRE-compatible - directly connects to standard MCU I/O ports without protocol translation |
| Industrial temperature range | -40°C to +85°C - qualified for deployment in process control, factory automation, and outdoor telemetry |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
Use Scenario: Battery-powered field sensor node recording temperature, pressure, and humidity at 10–100Hz intervals. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs; provides precise 10-bit resolution with minimal power overhead between samples. Use Value: 3mW active power and 2µA shutdown enable multi-year battery life; SO-8 footprint saves PCB area in compact enclosures. |
Use Scenario: PLC analog input module acquiring 4–20mA loop signals from flow meters and transmitters in chemical plants. IC Role / Device Role / Timing Role: Front-end ADC converts isolated analog inputs to digital; external reference ensures traceability to system-level calibration standards. Use Value: ±1 LSB INL and -40°C to +85°C rating guarantee accuracy across harsh industrial environments without recalibration. |
| Test Equipment | Isolated Data Acquisition |
Use Scenario: Handheld multimeter or portable oscilloscope capturing transient waveforms up to 36kHz. IC Role / Device Role / Timing Role: High-speed 73ksps sampling ADC with deterministic 7.5µs conversion latency for time-domain analysis. Use Value: 2.25MHz small-signal bandwidth supports undersampling of higher-frequency events; SPI interface enables fast MCU readout. |
Use Scenario: Medical patient monitor isolating biopotential signals (ECG, EEG) using optocouplers or digital isolators before digitization. IC Role / Device Role / Timing Role: Isolated-side ADC converting low-noise analog front-end outputs; referenced to isolated local supply and ground. Use Value: External reference flexibility allows use of ultra-low-noise isolated references; 16pF input capacitance minimizes loading on high-Z isolation stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1243ACSA+ | Same architecture and pinout; rated for 0°C to +70°C commercial temperature range | Lower cost for non-industrial environments (e.g., lab equipment, consumer test gear) | Select when operating ambient stays within 0°C–70°C and industrial qualification is unnecessary |
| ADS7822U | 12-bit resolution, 200ksps, 2.7V–5.5V supply, SPI-compatible, but requires external reference and has different pinout | Higher resolution and speed for precision measurement; not pin-compatible | Choose when 12-bit accuracy and faster sampling outweigh PCB redesign effort |
Compared with MAX1243ACSA+, the MAX1243BESA+ offers extended temperature reliability at identical performance; compared with ADS7822U, it trades resolution and speed for drop-in compatibility and lower system-level complexity in existing SO-8 layouts.
Availability
MAX1243BESA+ is available at Aetrix Electronics and suitable for portable data logging, process control monitoring, and isolated data acquisition requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX1243BESA+ 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 demanding industrial, medical, and communications applications.
The MAX1242/MAX1243 product line delivers low-power, serial-interface ADCs optimized for space- and energy-constrained remote sensing and data-acquisition systems requiring guaranteed performance from -40°C to +85°C.
FAQ
What is the reference voltage configuration for MAX1243BESA+?
The MAX1243BESA+ requires an external reference voltage applied to the REF pin, supporting 1.0V to VDD. Unlike the MAX1242, it has no internal reference. The external reference must provide ≤10Ω output impedance and sustain up to 250µA load during conversion; a minimum 0.1µF ceramic capacitor is required at REF for stability. This configuration ensures system-level accuracy traceability and flexibility in multi-channel or ratiometric designs.
Does MAX1243BESA+ support SPI communication?
Yes, MAX1243BESA+ supports SPI communication with CPOL = 0 and CPHA = 0. Its 3-wire interface (CS, SCLK, DOUT) is fully compatible with standard SPI controllers: CS falling edge initiates conversion, DOUT rising edge signals end-of-conversion (EOC), and data shifts out MSB-first on SCLK falling edges. No additional logic or level-shifting is needed to interface with common microcontrollers including ARM Cortex-M and PIC families.
What is the maximum sampling rate of MAX1243BESA+?
The MAX1243BESA+ achieves a maximum sampling rate of 73ksps, corresponding to a fixed 7.5µs conversion time. This rate is achievable at fSCLK = 2.1MHz with proper timing margins. At lower throughput (e.g., 1ksps), average supply current drops to 66µW, making it suitable for duty-cycled sensor applications. The device does not require continuous clocking - data can be read asynchronously after EOC assertion.
How does shutdown mode operate on MAX1243BESA+?
Shutdown mode on MAX1243BESA+ is activated by pulling the SHDN pin low, reducing supply current to ≤2µA (VDD ≤3.6V). The device wakes up in ~4µs if the external reference remains powered; no reinitialization is required. During shutdown, DOUT enters high-impedance state and conversion is halted. This feature enables aggressive power gating in battery-operated systems without sacrificing startup latency or signal integrity.
What package type and RoHS status does MAX1243BESA+ have?
MAX1243BESA+ uses an 8-pin SO (Small Outline) package (JEDEC MO-153, outline 21-0041) with gull-wing leads and RoHS-compliant lead-free finish ("+" suffix). It features a thermal pad connected to GND and supports reflow soldering per J-STD-020. The package is pin-compatible with other MAX1242/MAX1243 variants in SO-8, enabling direct substitution in existing industrial PCB layouts.
MAX1243BESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 73k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1243BESA+ FAQ
1.How can I place an order for MAX1243BESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1243BESA+ 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 MAX1243BESA+ reliable?
The price and inventory of MAX1243BESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1243BESA+ is usually 5 days.
3.What payment methods are accepted for MAX1243BESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1243BESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1243BESA+?
MAX1243BESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1243BESA+ 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 MAX1243BESA+?
For technical support, including MAX1243BESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1243BESA+ requirements.
6.How does Aetrix verify that MAX1243BESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1243BESA+ 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 MAX1243BESA+ meets industry standards.
7.What is the process for return or replacement of MAX1243BESA+?
All MAX1243BESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1243BESA+, 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 MAX1243BESA+ part is unused and in its original packaging.
Return procedure for MAX1243BESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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