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Analog Devices Inc./Maxim Integrated MAX1243BMJA
- Part No.:
- MAX1243BMJA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX1243BMJA.pdf
- Description:
- LOW-POWER, 10-BIT SERIAL ADC
- Quantity:
- Payment:
- Shipping:
Inventory:507
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Product details
Overview
MAX1243BMJA from Maxim Integrated is a low-power, 10-bit successive-approximation analog-to-digital converter (SAR ADC) with external reference input, 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 and targets space-constrained, battery-powered data acquisition in harsh environments.
For engineers reviewing the MAX1243BMJA datasheet, MAX1243BMJA pinout, MAX1243BMJA application, or MAX1243BMJA equivalent, this page delivers verified electrical specs, military-grade package details (-55°C to +125°C), real-world timing behavior, and validated alternative options for remote sensing and isolated measurement systems.
Technical Context
The MAX1243BMJA implements a track-and-hold circuit with 1.5µs acquisition time and a 10-bit SAR core clocked internally-no external clock required for conversion. Its 3-wire serial interface uses unipolar MSB-first output with EOC signaling via DOUT high transition, compatible with standard microcontroller I/O without protocol translation.
It requires an external reference voltage (1.0V to VDD) applied at the REF pin, supports shutdown current as low as 2µA, and features internal protection diodes allowing AIN to swing from GND−0.3V to VDD+0.3V-enabling robust interfacing with industrial transducers and isolated front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR architecture delivering 1024 discrete output codes over full-scale range. |
| Sampling Rate | 73ksps maximum throughput-supports real-time monitoring of fast-changing sensor signals. |
| Conversion Time | 7.5µs fixed duration-enables deterministic timing control in closed-loop systems. |
| Supply Voltage | +2.7V to +5.25V single supply-simplifies power design in mixed-voltage embedded systems. |
| Power Consumption | 3mW at 73ksps (VDD = 3V); 5µW in shutdown-extends battery life in portable instrumentation. |
| Reference Input | External 1.0V–VDD reference at REF pin-allows precision scaling and ratiometric measurements. |
| Operating Temperature | -55°C to +125°C-qualified for aerospace, defense, and downhole industrial applications. |
Pinout & Package
MAX1243BMJA is housed in an 8-pin CERDIP (ceramic dual in-line package) with hermetic sealing and lead finish suitable for high-reliability, extended-temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections-requires local decoupling. |
| AIN (Pin 2) | Analog input | 0V to VREF sampling node; protected to GND−0.3V / VDD+0.3V-tolerates transient overvoltage. |
| SHDN (Pin 3) | Three-level shutdown control | Pull low for <10µA shutdown; float or high for active mode-enables flexible power sequencing. |
| REF (Pin 4) | External reference input | 1.0V–VDD reference source; bypass with ≥0.1µF capacitor-critical for DC accuracy stability. |
| GND (Pin 5) | Analog/digital common ground | Single ground plane connection point-must be star-connected to minimize noise coupling. |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion and enables DOUT-synchronizes serial readout with µP timing. |
| SCLK (Pin 8) | Serial clock input | Drives data shift-out up to 2.1MHz; duty cycle unrestricted if ≥200ns per phase-flexible µP interface. |
| DOUT (Pin 6) | Serial data output | High-impedance when CS high; outputs EOC flag then 10-bit code MSB-first-no external pull-up needed. |
Key Features
| Feature | Design Value |
|---|---|
| 3-wire serial interface | Fully compatible with SPI™, QSPI™, and Microwire™ protocols-eliminates need for level-shifting or glue logic. |
| Track-and-hold acquisition | 1.5µs acquisition time with internal 16pF hold capacitor-reduces external anti-alias filter complexity. |
| Low-power shutdown mode | 2µA typical shutdown current-enables microamp-level system sleep states in battery-operated loggers. |
| Military temperature grade | -55°C to +125°C operating range in hermetic CERDIP-meets MIL-STD-883 screening requirements. |
| Input protection diodes | Clamps AIN to GND−0.3V / VDD+0.3V-prevents latch-up during ESD or field-induced transients. |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes logging temperature, pressure, and humidity over weeks. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs with minimal power overhead and precise timing control. Use Value: 3mW active power and 2µA shutdown enable multi-year operation on coin-cell batteries without compromising sampling fidelity. |
Use Scenario: Distributed PLC I/O modules measuring 4–20mA loop signals in chemical plant control cabinets. IC Role / Device Role / Timing Role: Isolated analog front-end ADC interfacing with optocoupled or transformer-coupled signal paths. Use Value: REF pin accepts ratiometric references tied to loop supply, enabling drift-free measurement across wide temperature ranges. |
| Test Equipment | Isolated Data Acquisition |
Use Scenario: Handheld multimeters and portable oscilloscope probes requiring high linearity and fast settling. IC Role / Device Role / Timing Role: High-fidelity digitizer capturing transient waveforms with 66dB SINAD and 70dB SFDR performance. Use Value: 7.5µs conversion time and 1.5µs acquisition support >100kSPS effective sampling in burst-mode instruments. |
Use Scenario: Medical patient monitors acquiring biopotential signals across reinforced isolation barriers. IC Role / Device Role / Timing Role: Secondary-side ADC receiving analog signals via capacitive or magnetic isolators. Use Value: Single-supply +2.7V–+5.25V operation and rail-to-rail reference flexibility simplify isolated power domain design. |
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 core ADC, SO-8 package, 0°C to +70°C commercial temp range | Lacks hermetic sealing and extended temperature capability-suitable for lab equipment or consumer-grade loggers | Select when cost, board space, and reflow compatibility outweigh military-grade reliability needs. |
| ADS7822U | TI 10-bit SAR ADC, 200ksps, 2.7V–5.25V, SPI-compatible, but no SHDN pin or integrated T/H | Requires external track/hold and higher drive strength for REF-increases BOM count and layout complexity | Choose only if higher speed justifies added external components and validation effort. |
Compared with MAX1243ACSA, the MAX1243BMJA provides guaranteed operation from -55°C to +125°C in a hermetic CERDIP package, while ADS7822U trades integrated T/H and shutdown control for raw speed-making MAX1243BMJA optimal for ruggedized, low-maintenance deployments where long-term stability matters more than peak throughput.
Availability
MAX1243BMJA is available at Aetrix Electronics and suitable for portable data logging, process control monitoring, and isolated data acquisition requiring stable component supply across extended temperature extremes and long product lifecycles.
Supply support for MAX1243BMJA 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, automotive, and communications applications.
The MAX1242/MAX1243 product line delivers low-power, serial-interface ADCs optimized for space-constrained, battery-operated, and high-reliability measurement systems-emphasizing ease of integration, minimal external components, and robust operation across extreme temperatures.
FAQ
What is the operating temperature range of the MAX1243BMJA?
The MAX1243BMJA is rated for continuous operation from -55°C to +125°C. This military-grade temperature specification is achieved through its hermetic 8-pin CERDIP package and internal design validation per MIL-STD-883 requirements-making it suitable for aerospace, defense, and downhole industrial applications where ambient conditions exceed commercial-grade limits.
Does the MAX1243BMJA include an internal voltage reference?
No, the MAX1243BMJA does not include an internal voltage reference. It is the external-reference variant of the MAX1242/MAX1243 family and requires a precision reference voltage (1.0V to VDD) applied at the REF pin. This design allows ratiometric measurements and eliminates reference drift dependencies inherent in on-chip references-critical for high-accuracy sensor interfaces.
How does the MAX1243BMJA handle analog input overvoltage conditions?
The MAX1243BMJA integrates internal protection diodes that clamp the AIN pin to GND−0.3V and VDD+0.3V, preventing damage from moderate transients. However, for accurate conversions near full scale, the input must remain within GND−50mV to VDD+50mV. Exceeding those bounds requires limiting input current to ≤2mA using series resistance-ensuring safe operation without sacrificing measurement integrity.
What is the minimum acquisition time required before initiating a conversion on the MAX1243BMJA?
The MAX1243BMJA specifies a maximum acquisition time (tACQ) of 1.5µs under typical conditions (RS < 4kΩ). This value represents both the longest time needed to acquire the signal and the shortest interval that must elapse after CS falling edge before conversion begins. For higher source impedances, tACQ increases per tACQ = 7(RS + RIN) × 16pF-requiring careful front-end buffering or additional settling time.
Can the MAX1243BMJA interface directly with a standard SPI microcontroller without level-shifting?
Yes, the MAX1243BMJA interfaces directly with standard 3.3V or 5V SPI microcontrollers. Its digital inputs (CS, SCLK, SHDN) accept VIH ≥ 2.0V (VDD ≤ 3.6V) or VIH ≥ VDD − 0.4V (VDD > 3.6V), and its DOUT output swings rail-to-rail-fully compliant with SPI CPOL = 0, CPHA = 0 timing. No level-shifting or external pull-ups are required for reliable communication at up to 2.1MHz.
MAX1243BMJA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 73k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- 3-Wire Serial, Microwire, QSPI, SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- 8-CERDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1243BMJA FAQ
1.How can I place an order for MAX1243BMJA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1243BMJA 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 MAX1243BMJA reliable?
The price and inventory of MAX1243BMJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1243BMJA is usually 5 days.
3.What payment methods are accepted for MAX1243BMJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1243BMJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1243BMJA?
MAX1243BMJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1243BMJA 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 MAX1243BMJA?
For technical support, including MAX1243BMJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1243BMJA requirements.
6.How does Aetrix verify that MAX1243BMJA is sourced from the original manufacturer or authorized distributors?
All MAX1243BMJA 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 MAX1243BMJA meets industry standards.
7.What is the process for return or replacement of MAX1243BMJA?
All MAX1243BMJA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1243BMJA, 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 MAX1243BMJA part is unused and in its original packaging.
Return procedure for MAX1243BMJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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