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Analog Devices Inc./Maxim Integrated MAX1243ACSA+T
- Part No.:
- MAX1243ACSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1243ACSA+T.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,451
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Product details
Overview
MAX1243ACSA+T from Maxim Integrated is a low-power, 10-bit successive-approximation analog-to-digital converter (ADC) with external reference input, 73ksps throughput, 7.5µs conversion time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - used in portable data loggers for precision sensor digitization under battery-constrained conditions.
For engineers reviewing the MAX1243ACSA+T datasheet, MAX1243ACSA+T pinout, MAX1243ACSA+T application, or MAX1243ACSA+T equivalent, this page delivers verified electrical specs, SO-8 package mapping, real-world use-value per application, and two validated alternative parts with documented functional and layout implications.
Technical Context
The MAX1243ACSA+T implements a track/hold circuit with 1.5µs acquisition time and a 10-bit SAR ADC core, operating from a single +2.7V to +5.25V supply. It requires an external reference voltage (1.0V to VDD), accepts analog inputs from 0V to VREF, and features internal clock generation independent of SCLK for conversion timing.
Its 3-wire serial interface uses unipolar MSB-first output format with EOC signaling via DOUT high transition, supports up to 2.1MHz SCLK, and maintains compatibility with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes over full-scale input range |
| Max Sampling Rate | 73ksps - enables real-time capture of signals up to ~36.5kHz Nyquist bandwidth |
| Conversion Time | 7.5µs - fixed internal timing; allows deterministic system-level scheduling |
| Power Consumption | 3mW at 73ksps (VDD = 3V) - supports multi-day operation in coin-cell-powered sensors |
| INL Error | ±0.5 LSB (max) - ensures monotonicity and <0.05% full-scale linearity error across temperature |
| Analog Input Range | 0V to VREF - requires external reference; supports flexible scaling from 1.0V to VDD |
| Reference Input Range | 1.0V to VDD - permits rail-to-rail reference selection for optimized dynamic range |
Pinout & Package
MAX1243ACSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with standard JEDEC SO-8 footprint (package code S8+5, outline 21-0041). Pin 1 is VDD; pin 5 is GND; pin 8 is SCLK - all pins are surface-mount compatible with 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; bypass required |
| AIN (Pin 2) | Analog input | 0V to VREF sampling node; protected to ±0.3V beyond supplies; 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 (unlike MAX1242) |
| REF (Pin 4) | External reference input | 1.0V to VDD range; must source ≤10Ω impedance and ≥250µA DC load 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 timing; max 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 design complexity in portable systems |
| Low-power shutdown | 2µA typical - reduces average current in intermittent-sampling applications (e.g., hourly temperature reads) |
| On-chip track/hold | 1.5µs acquisition time - enables accurate sampling of signals with source impedances ≤4kΩ without external buffering |
| 3-wire serial interface | SPI/QSPI/MICROWIRE compatible - interfaces directly to microcontroller GPIO without level shifters or protocol translation |
| Small SO-8 package | 4.9mm × 3.9mm footprint - saves PCB area in space-constrained modules like wearable sensors |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure every 10 seconds. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from analog front-end op-amps before MCU storage/transmission. Use Value: 3mW active power and 2µA shutdown enable >1-year operation on CR2032; SO-8 size fits compact enclosure. |
Use Scenario: Industrial PLC analog input module measuring 4–20mA loop signals via precision shunt resistor. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC converting shunt voltage to digital value for PID controller feedback. Use Value: ±0.5 LSB INL ensures <0.05% measurement error across 0°C to +70°C industrial ambient range. |
| Test Equipment | Isolated Data Acquisition |
Use Scenario: Handheld multimeter with autoranging and true RMS calculation requiring fast, repeatable ADC sampling. IC Role / Device Role / Timing Role: Core digitizer for AC/DC voltage and current measurements; synchronized to internal timing engine. Use Value: 73ksps throughput supports 10ksps effective sampling for oversampled RMS computation; 2.25MHz small-signal BW captures transients. |
Use Scenario: Medical patient monitor acquiring biopotential signals (ECG, EEG) across reinforced isolation barrier. IC Role / Device Role / Timing Role: Isolated-side ADC converting amplified analog bio-signals before digital isolation transmission. Use Value: External reference support allows precise matching to isolated reference source; 1.5µs tACQ minimizes inter-channel skew in multi-channel designs. |
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 |
|---|---|---|---|
| MAX1242ACSA+ | Integrated 2.5V reference; no external REF required; same SO-8 pinout and timing | Eliminates external reference component but fixes full-scale to 2.5V; less flexible scaling | Select when reference stability and BOM simplification outweigh need for adjustable input range |
| ADS7822U | 12-bit resolution; 200ksps; SPI-only interface; 2.7V–5.5V supply; different pinout (SO-8, but CS/SCLK/DOUT assigned differently) | Higher resolution and speed, but requires PCB redesign due to non-pin-compatible layout and distinct timing requirements | Select when 12-bit accuracy and faster sampling justify layout revision and firmware adaptation |
Compared with MAX1242ACSA+, MAX1243ACSA+T offers external reference flexibility at the cost of one additional passive component; compared with ADS7822U, it trades resolution and speed for pin compatibility, lower power at 73ksps, and guaranteed SPI/QSPI/MICROWIRE interoperability without timing revalidation.
Availability
MAX1243ACSA+T is available at Aetrix Electronics and suitable for portable data logging, process control monitoring, and test equipment requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.
Supply support for MAX1243ACSA+T 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 and mixed-signal ICs for demanding industrial, medical, and portable applications.
The MAX1242/MAX1243 product line targets low-power, space-constrained data acquisition systems requiring high accuracy, simple digital interfacing, and robust operation across commercial temperature ranges.
FAQ
What is the reference voltage requirement for MAX1243ACSA+T?
The MAX1243ACSA+T requires an external reference voltage applied to the REF pin, ranging from 1.0V to VDD. It must deliver ≥250µA DC load current during conversion and maintain ≤10Ω output impedance. A minimum 0.1µF bypass capacitor is required; 4.7µF is recommended for noisy references. The MAX1243ACSA+T does not include an internal reference.
Does MAX1243ACSA+T support SPI communication?
Yes, MAX1243ACSA+T supports SPI communication with CPOL = 0 and CPHA = 0 configuration. It uses CS as chip select, SCLK for serial clocking, and DOUT for data output. The interface is fully compatible with standard SPI peripherals and requires no additional level-shifting or protocol translation circuitry.
What is the maximum sampling rate of MAX1243ACSA+T?
The MAX1243ACSA+T achieves a maximum sampling rate of 73ksps at VDD = 3V and fSCLK = 2.1MHz. This corresponds to a fixed 7.5µs conversion time, independent of SCLK frequency. Throughput is limited by the internal SAR architecture, not the serial interface speed.
How does shutdown mode work on MAX1243ACSA+T?
Shutdown mode on MAX1243ACSA+T 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. SHDN high or open places the device in normal operation; unlike MAX1242, SHDN has no effect on reference selection in MAX1243ACSA+T.
What package type is used for MAX1243ACSA+T?
MAX1243ACSA+T uses an 8-pin SO (Small Outline) package, RoHS-compliant, with JEDEC-standard dimensions (4.9mm × 3.9mm body, 1.27mm lead pitch). Its package code is S8+5 (outline 21-0041), and it shares pinout compatibility with other MAX124x variants in SO-8 format.
MAX1243ACSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1243ACSA+T FAQ
1.How can I place an order for MAX1243ACSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1243ACSA+T 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 MAX1243ACSA+T reliable?
The price and inventory of MAX1243ACSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1243ACSA+T is usually 5 days.
3.What payment methods are accepted for MAX1243ACSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1243ACSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1243ACSA+T?
MAX1243ACSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1243ACSA+T 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 MAX1243ACSA+T?
For technical support, including MAX1243ACSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1243ACSA+T requirements.
6.How does Aetrix verify that MAX1243ACSA+T is sourced from the original manufacturer or authorized distributors?
All MAX1243ACSA+T 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 MAX1243ACSA+T meets industry standards.
7.What is the process for return or replacement of MAX1243ACSA+T?
All MAX1243ACSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1243ACSA+T, 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 MAX1243ACSA+T part is unused and in its original packaging.
Return procedure for MAX1243ACSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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