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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:2,847
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Product details
Overview
MAX1243BESA 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 - designed for space-constrained remote sensor nodes requiring precision digitization of 0V to VREF signals.
For engineers reviewing the MAX1243BESA datasheet, MAX1243BESA pinout, MAX1243BESA application, or MAX1243BESA equivalent, this page delivers verified technical context, real-world timing behavior, package-specific thermal and layout constraints, and validated alternative options for industrial data acquisition and portable measurement systems.
Technical Context
The MAX1243BESA implements a track/hold circuit with 1.5µs acquisition time and a 10-bit SAR core clocked by an internal oscillator; it requires no external clock for conversion completion but uses SCLK up to 2.1MHz for serial readout. Its REF pin accepts external references from 1.0V to VDD with ≤10Ω output impedance and ≥18kΩ DC input impedance.
Operation is controlled via CS (active-low chip select) and SHDN (three-level shutdown), enabling <2µA power-down current. The device outputs unipolar binary data MSB-first: one leading EOC bit, ten data bits, two sub-bits, and trailing zeros - compatible with standard microcontroller I/O without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR architecture delivering 1024 distinct digital codes over full-scale range |
| Throughput Rate | 73ksps maximum sampling rate at fSCLK = 2.1MHz, enabling real-time monitoring of fast transients |
| Conversion Time | 7.5µs fixed internal conversion duration, independent of external clock timing |
| Reference Input Range | 1.0V to VDD (up to +5.25V), supporting flexible system-level voltage scaling and ratiometric sensing |
| Supply Voltage | +2.7V to +5.25V single supply, eliminating need for dual-rail or charge-pump circuitry |
| Power Consumption | 3mW at 73ksps (VDD = 3V); drops to 2µA in shutdown mode for battery-powered duty cycling |
| INL (Integral Nonlinearity) | ±1 LSB max over –40°C to +85°C, ensuring monotonicity and calibration stability across industrial temperature range |
Pinout & Package
MAX1243BESA is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant, 1.27mm pitch, and thermal pad connected to GND - optimized for reflow soldering and PCB area efficiency in compact sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | Accepts +2.7V to +5.25V; powers internal logic, SAR, and track/hold - bypass required externally |
| AIN (Pin 2) | Analog input node | 0V to VREF sampling input; protected by internal clamping diodes to VDD/GND (±0.3V fault tolerance) |
| SHDN (Pin 3) | Three-level control input | Low = shutdown (<2µA); open = external reference enabled; high = reserved (not used for MAX1243) |
| REF (Pin 4) | Reference voltage terminal | External reference input (1.0V–VDD); requires ≥0.1µF ceramic bypass close to pin for noise immunity |
| GND (Pin 5) | Analog/digital common ground | Single-point return for analog signal path and digital interface - critical for PSR and INL performance |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; high state places DOUT in high-impedance mode to prevent bus contention |
| SCLK (Pin 8) | Serial clock input | Asynchronous read clock (≤2.1MHz); duty cycle unrestricted if each phase ≥200ns |
| DOUT (Pin 6) | Serial data output | MSB-first unipolar stream: EOC bit → 10 data bits → 2 sub-bits; transitions on SCLK falling edge |
Key Features
| Feature | Design Value |
|---|---|
| 3-wire serial interface | Fully compatible with SPI, QSPI, and MICROWIRE protocols using only CS, SCLK, and DOUT - no additional control lines needed |
| Internal track/hold | 1.5µs acquisition time enables accurate sampling of signals with source impedances ≤4kΩ without external buffering |
| Low-power shutdown | 2µA typical shutdown current allows >1000× reduction vs. active mode - essential for intermittent-sampling battery systems |
| Flexible reference support | Accepts external references from 1.0V to VDD with specified accuracy; supports ratiometric designs and precision voltage references |
| Industrial temperature range | Specified from –40°C to +85°C with ±1 LSB INL, enabling deployment in harsh environments without derating |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10–100Hz intervals. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from analog front-end sensors; operates in burst mode with SHDN-controlled sleep cycles. Use Value: 3mW active power and 2µA shutdown enable multi-year operation on coin-cell batteries while maintaining 10-bit resolution and ±1 LSB linearity. |
Use Scenario: DIN-rail mounted PLC analog input module acquiring 4–20mA loop signals from field transmitters. IC Role / Device Role / Timing Role: High-accuracy digitizer interfacing with precision op-amp current-to-voltage converters; synchronized via CS-triggered conversions. Use Value: 1.0V–5.25V reference flexibility allows direct use of loop-supply-derived references, eliminating dedicated reference ICs and reducing BOM count. |
| Test Equipment | Isolated Data Acquisition |
Use Scenario: Handheld multimeter with autoranging and true RMS calculation requiring stable, low-noise ADC performance. IC Role / Device Role / Timing Role: Core measurement ADC accepting variable full-scale inputs via programmable gain amplifier; referenced to precision 2.5V external reference. Use Value: 66dB SINAD and 70dB SFDR at 10kHz ensure accurate harmonic analysis and low-noise DC measurements under varying load conditions. |
Use Scenario: Medical patient monitor digitizing isolated biopotential signals (ECG, EEG) using transformer-coupled or capacitive isolation. IC Role / Device Role / Timing Role: Isolated-side ADC converting amplified analog signals; communicates across isolation barrier via optocoupler-driven serial interface. Use Value: SO-8 package and minimal external components simplify layout in isolated domains; 7.5µs conversion time supports real-time waveform capture at clinical sampling rates. |
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 |
|---|---|---|---|
| MAX1242BESA | Integrated 2.5V reference (±30ppm/°C drift); same SO-8 package, pinout, and timing; higher quiescent current (3.7mW @73ksps) | Eliminates external reference component but reduces reference flexibility and increases supply current | Select when system lacks stable external reference and board space is constrained |
| ADS7822U | TI 10-bit SAR ADC; 200ksps max; 2.7–5.25V supply; SPI-compatible; no internal T/H; requires external sample clock | Higher speed but lacks integrated track/hold - demands careful analog front-end design for transient fidelity | Select when throughput >73ksps is required and external T/H or faster settling can be accommodated |
Compared with MAX1242BESA, MAX1243BESA trades internal reference convenience for lower power and full reference voltage flexibility; compared with ADS7822U, it provides guaranteed 1.5µs acquisition and simplified timing at the cost of 127ksps headroom - making it optimal for precision, low-power, space-limited industrial sensing.
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 extended 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX1242/MAX1243 product line was engineered for ultra-low-power, high-accuracy data acquisition in size- and energy-constrained systems - emphasizing integration, ease of interface, and robustness across industrial temperature extremes.
FAQ
What is the reference voltage range supported by the MAX1243BESA?
The MAX1243BESA accepts external reference voltages from 1.0V to VDD (up to +5.25V) at its REF pin. For specified accuracy, the reference must have ≤10Ω output impedance and ≥18kΩ DC input impedance. A minimum 0.1µF ceramic capacitor is required directly at the REF pin to ensure stability during conversion.
How does the SHDN pin function on the MAX1243BESA?
On the MAX1243BESA, the SHDN pin operates as a three-level input: pulling it low enables shutdown mode (<2µA supply current); leaving it open enables external reference operation; pulling it high is not used and has no defined function per datasheet. Unlike the MAX1242, SHDN high does not activate an internal reference.
What is the maximum SCLK frequency supported by the MAX1243BESA?
The MAX1243BESA supports SCLK frequencies up to 2.1MHz for serial data readout. The clock duty cycle is unrestricted provided each high and low phase is ≥200ns. SCLK must remain low during conversion; clocking while conversion is active may corrupt the output data stream.
Does the MAX1243BESA include an internal track/hold circuit?
Yes, the MAX1243BESA integrates a track/hold circuit with a guaranteed 1.5µs acquisition time. This allows direct connection to moderate-impedance sources (≤4kΩ) without external buffering. For higher source impedances, a 0.01µF capacitor at AIN is recommended to maintain AC performance.
What package type and RoHS status does the MAX1243BESA use?
The MAX1243BESA is supplied in an 8-pin SO (Small Outline) package with gull-wing leads, 1.27mm pitch, and thermal pad connected to GND. The "+" suffix confirms it is lead(Pb)-free and RoHS-compliant per Maxim Integrated's packaging standards.
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:
- Obsolete
- 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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