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Analog Devices Inc./Maxim Integrated MAX1243BCSA+T
- Part No.:
- MAX1243BCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1243BCSA+T.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,045
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Product details
Overview
MAX1243BCSA+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 - designed for space-constrained remote sensor nodes requiring precision digitization of 0V to VREF signals.
For engineers reviewing the MAX1243BCSA+T datasheet, MAX1243BCSA+T pinout, MAX1243BCSA+T application, or MAX1243BCSA+T equivalent, this page delivers verified electrical parameters, SO-8 package mapping, functional pin roles, real-world use cases in isolated data acquisition and portable logging, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX1243BCSA+T implements a track/hold circuit with 1.5µs acquisition time and a 10-bit SAR core clocked internally; it requires no external clock for conversion completion but uses an external SCLK (up to 2.1MHz) for serial data readout. Its REF pin accepts external reference voltages from 1.0V to VDD, with specified accuracy maintained only when source impedance ≤10Ω and load current ≤250µA.
Operation is controlled via three digital signals: active-low CS initiates conversion on its falling edge, SCLK clocks out data on falling edges, and SHDN supports three-level shutdown (low = 2µA mode; high/open = operational). The device outputs unipolar binary data (MSB-first), including one leading EOC bit, ten data bits, and two sub-bits - totaling 13 serial bits per conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR architecture delivering 1024 discrete output codes over full-scale range |
| Throughput Rate | 73ksps maximum sampling speed - enables real-time monitoring of fast transients up to ~36kHz Nyquist bandwidth |
| Conversion Time | 7.5µs fixed internal conversion duration - defines minimum inter-conversion interval in continuous mode |
| Reference Input Range | 1.0V to VDD - allows flexible scaling from low-voltage sensors to rail-to-rail input systems |
| Supply Voltage | +2.7V to +5.25V single supply - compatible with Li-ion, 3.3V, and 5V logic domains without level-shifting |
| Power Consumption | 3mW at 73ksps (VDD = 3V); 66µW at 1ksps - supports battery operation for >1 year in intermittent-sampling applications |
| INL Error | ±1 LSB max over temperature - ensures monotonicity and <0.1% full-scale linearity error in closed-loop control |
Pinout & Package
MAX1243BCSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with gull-wing leads and standard JEDEC MS-012AC footprint (outline 21-0041). Thermal resistance θJA = 170°C/W; derating 5.88mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog core, digital interface, and internal bias networks |
| AIN (Pin 2) | Analog input node | Sampled signal input referenced to GND; supports 0V to VREF range with 16pF input capacitance |
| SHDN (Pin 3) | Three-state shutdown control | Pulling low enables 2µA power-down; high/open selects operational mode and disables internal reference |
| REF (Pin 4) | External reference voltage input | Accepts 1.0V–VDD reference; requires ≤10Ω source impedance and ≥0.1µF local bypass |
| GND (Pin 5) | Analog/digital common ground | Single ground plane required; separation from noisy digital returns prevents measurement noise coupling |
| 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; supports up to 2.1MHz with ≥200ns pulse width per phase |
| DOUT (Pin 6) | Serial data output | Outputs EOC + 10-bit result + 2 sub-bits on SCLK falling edges; high-Z when CS = high |
Key Features
| Feature | Design Value |
|---|---|
| 3-wire serial interface | Fully compatible with SPI, QSPI, and MICROWIRE protocols - eliminates need for parallel bus or dedicated ADC controller |
| 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 - reduces average system power by >99% during idle intervals in duty-cycled sensing |
| Flexible reference support | Accepts external references from 1.0V to VDD with ±30ppm/°C tempco - supports precision ratiometric or absolute measurements |
| Small SO-8 footprint | 5.0mm × 4.0mm body size - fits into compact PCB layouts for handheld instruments and IoT edge nodes |
Applications
| Portable Data Logging | Process Control Monitoring |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10s intervals over weeks. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs; 73ksps capability supports oversampling for noise reduction; 2µA shutdown extends battery life. Use Value: Enables >1-year field deployment on CR2032 coin cell due to ultra-low active and standby power. |
Use Scenario: Industrial PLC analog input module acquiring 4–20mA loop signals from flow meters and valve positioners. IC Role / Device Role / Timing Role: Digitizes isolated current-loop outputs after I/V conversion; 10-bit resolution meets 0.1% process accuracy requirements. Use Value: Delivers ±1 LSB INL and 66dB SINAD - sufficient for Class B industrial measurement standards (IEC 61000-4-30). |
| Temperature Measurement | Isolated Data Acquisition |
Use Scenario: Medical thermometer using thermistor or RTD with precision voltage divider and cold-junction compensation. IC Role / Device Role / Timing Role: Converts ratiometric bridge output referenced to stable external VREF; 1.0V–VDD reference range accommodates low-voltage thermistor biasing. Use Value: ±1 LSB INL and 70dB SFDR ensure <0.1°C resolution stability across -20°C to +85°C operating range. |
Use Scenario: High-voltage motor drive monitoring phase currents via isolated shunt amplifiers with galvanic separation. IC Role / Device Role / Timing Role: Digitizes amplified shunt voltage after isolation amplifier; SO-8 package simplifies creepage/clearance layout on isolated PCB sections. Use Value: 2.25MHz small-signal bandwidth supports accurate capture of PWM-edge transients in 20kHz switching inverters. |
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 |
|---|---|---|---|
| MAX1242BCSA+ | Integrated 2.5V reference (±30ppm/°C); no external REF required; higher quiescent current (3.7mW vs. 3mW at 73ksps) | Preferred where board space prohibits external reference design; unsuitable when reference voltage must scale with sensor excitation | Select MAX1242BCSA+ when eliminating external reference components outweighs minor power penalty |
| ADS7822U | TI 10-bit SAR ADC; 200ksps max; 2.7V–5.25V supply; SPI-only interface; no SHDN pin; 1.5µs acquisition time | Lacks hardware shutdown control; requires external reference; higher speed but larger 8-pin MSOP package (3.0×3.0mm vs. SO-8's 5.0×4.0mm) | Choose ADS7822U only if 200ksps throughput is mandatory and PCB layout permits MSOP footprint |
Compared with MAX1242BCSA+, MAX1243BCSA+ trades integrated reference for lower power and external reference flexibility; compared with ADS7822U, it offers hardware shutdown and SO-8 compatibility at the cost of 127ksps lower maximum throughput.
Availability
MAX1243BCSA+T is available at Aetrix Electronics and suitable for portable data logging, process control monitoring, and isolated data acquisition requiring stable component supply across extended production lifecycles.
Supply support for MAX1243BCSA+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, mixed-signal, and power-management ICs for industrial, medical, and communications systems.
The MAX1242/MAX1243 product line targets low-power, space-constrained data acquisition where 10-bit resolution, serial simplicity, and microamp shutdown current are critical - especially in battery-operated and isolated sensor interfaces.
FAQ
What is the reference voltage requirement for MAX1243BCSA+T?
The MAX1243BCSA+T requires an external reference voltage applied to the REF pin, ranging from 1.0V to VDD. For optimal accuracy, the reference source must have ≤10Ω output impedance and support up to 250µA DC load current during conversion. A minimum 0.1µF ceramic capacitor must be placed directly at the REF pin.
Does MAX1243BCSA+T support SPI protocol natively?
Yes, MAX1243BCSA+T supports SPI protocol natively with CPOL = 0 and CPHA = 0 configuration. It outputs 13 serial bits per conversion (1 EOC + 10 data + 2 sub-bits) on DOUT, synchronized to SCLK falling edges, and is compatible with standard microcontroller SPI master peripherals without additional glue logic.
What is the maximum sampling rate of MAX1243BCSA+T?
The MAX1243BCSA+T achieves a maximum sampling rate of 73ksps, limited by its fixed 7.5µs conversion time and minimum CS pulse width (240ns). At this rate, power consumption is 3mW with VDD = 3V. Lower throughput rates reduce average current - e.g., 66µW at 1ksps - via controlled shutdown cycling.
Can MAX1243BCSA+T operate from a 2.7V supply?
Yes, MAX1243BCSA+T is fully specified for operation from +2.7V to +5.25V. At 2.7V, it maintains 10-bit resolution, ±1 LSB INL, and 73ksps throughput. Supply current drops to ~1.0mA (2.7mW), and all timing parameters - including tACQ = 1.5µs and tCONV = 7.5µs - remain guaranteed across the full voltage range.
How does the SHDN pin function on MAX1243BCSA+T?
The SHDN pin on MAX1243BCSA+T provides three-level control: pulled low → 2µA shutdown mode; pulled high or left open → normal operation. Unlike the MAX1242, SHDN state has no effect on reference selection for MAX1243BCSA+T - the device always uses external reference regardless of SHDN voltage.
MAX1243BCSA+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:
- -
MAX1243BCSA+T FAQ
1.How can I place an order for MAX1243BCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1243BCSA+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 MAX1243BCSA+T reliable?
The price and inventory of MAX1243BCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1243BCSA+T is usually 5 days.
3.What payment methods are accepted for MAX1243BCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1243BCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1243BCSA+T?
MAX1243BCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1243BCSA+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 MAX1243BCSA+T?
For technical support, including MAX1243BCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1243BCSA+T requirements.
6.How does Aetrix verify that MAX1243BCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX1243BCSA+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 MAX1243BCSA+T meets industry standards.
7.What is the process for return or replacement of MAX1243BCSA+T?
All MAX1243BCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1243BCSA+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 MAX1243BCSA+T part is unused and in its original packaging.
Return procedure for MAX1243BCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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