My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1240CESA
- Part No.:
- MAX1240CESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1240CESA.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,430
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1240CESA from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (ADC) with internal 2.5V reference, 73ksps throughput, 7.5µs conversion time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for precision data acquisition in space-constrained, battery-powered sensor systems.
For engineers reviewing the MAX1240CESA datasheet, MAX1240CESA pinout, MAX1240CESA application, or MAX1240CESA equivalent, this page delivers verified electrical specs, package mapping to 8-pin SO, functional pin roles, real-world use cases in isolated sensing and portable instrumentation, and two validated alternative ADCs with documented differences in reference architecture and supply range.
Technical Context
The MAX1240CESA integrates an on-chip track/hold with 1.5µs acquisition time and a 12-bit SAR core clocked by an internal oscillator. It operates from a single +2.7V to +3.6V supply and uses its internal 2.5V reference (±30ppm/°C tempco, ±0.5 LSB INL) without external components beyond a 4.7µF REF bypass capacitor.
Its 3-wire serial interface supports unipolar MSB-first output with end-of-conversion (EOC) signaling via DOUT high transition, compatible with standard microcontroller I/O ports at up to 2.1MHz SCLK. Shutdown mode reduces supply current to ≤2µA while preserving state for fast wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale input range |
| Throughput Rate | 73ksps - supports real-time sampling of signals up to ~36.5kHz Nyquist bandwidth |
| Internal Reference | 2.500V ±20mV (TYP), ±30ppm/°C - eliminates need for external reference IC in most portable designs |
| Power Consumption | 3.7mW at 73ksps (VDD = 3V) - enables >100-hour operation on coin-cell batteries in low-duty-cycle logging |
| INL / DNL | ±0.5 LSB / ±1 LSB - ensures monotonicity and <0.012% full-scale linearity error for precision measurement |
| Aperture Jitter | <50ps - preserves SNR >70dB (10kHz input) despite low power and small package |
| Supply Range | +2.7V to +3.6V - compatible with Li-ion, Li-Po, and 3.3V regulated rails without level-shifting |
Pinout & Package
MAX1240CESA is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and lead-free (+ suffix), rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog and digital sections; requires 0.1µF + 4.7µF bypassing at pin |
| AIN (Pin 2) | Analog input | Single-ended input referenced to GND; accepts 0V to VREF (2.5V); 16pF input capacitance |
| SHDN (Pin 3) | Three-level shutdown control | Pulled high → enables internal reference; open → disables internal ref for external use; pulled low → 2µA shutdown mode |
| REF (Pin 4) | Reference voltage node | Outputs 2.5V (MAX1240 only); must be bypassed with 4.7µF capacitor for stable accuracy and fast wake-up |
| GND (Pin 5) | Analog/digital ground | Single-point star ground connection required; separates analog and digital return paths to minimize noise coupling |
| SCLK (Pin 6) | Serial clock input | Accepts external clock up to 2.1MHz; duty cycle unrestricted if ≥200ns per phase; clocks data out on falling edge |
| CS (Pin 7) | Active-low chip select | Falling edge initiates conversion; holds DOUT in high-impedance when high; minimum pulse width 240ns |
| DOUT (Pin 8) | Serial data output | Unipolar MSB-first format; EOC signaled by rising edge; transitions on SCLK falling edge; 3-state when CS high |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 2.7V–3.6V operation | Eliminates dual-rail design complexity and reduces BOM count in portable instrumentation |
| Integrated 2.5V reference with ±0.5 LSB INL | Enables calibrated 12-bit performance without external reference IC or trimming circuitry |
| 1.5µs track/hold acquisition time | Supports accurate sampling of signals from sources with ≤1kΩ impedance without external op-amp buffering |
| 3-wire SPI/QSPI/MICROWIRE interface | Direct connection to standard MCU GPIOs - no protocol translator or additional logic required |
| 2µA shutdown current | Extends battery life in intermittent-sampling applications such as environmental sensor nodes |
Applications
| Battery-Powered Data Loggers | Isolated Industrial Sensors |
|---|---|
Use Scenario: Continuous temperature/humidity monitoring in remote field deployments using AA/AAA batteries or energy harvesting. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; provides EOC framing for deterministic µC wake-up and low-power sleep scheduling. Use Value: 3.7mW active power and 2µA shutdown enable multi-year operation; internal reference removes calibration drift dependency on external components. |
Use Scenario: Signal conditioning in DIN-rail-mounted transmitters with galvanic isolation between field-side analog inputs and controller-side digital bus. IC Role / Device Role / Timing Role: Isolated-side ADC capturing sensor data before transmission across optocoupler or digital isolator; synchronized via isolated SCLK/CS lines. Use Value: Small 8-pin SO footprint minimizes isolated PCB area; 73ksps rate supports oversampling for noise reduction in noisy factory environments. |
| Portable Medical Instrumentation | Process Control Loop Monitoring |
Use Scenario: Handheld blood glucose meters or ECG front-ends requiring clinical-grade accuracy and compact form factor. IC Role / Device Role / Timing Role: High-fidelity analog signal digitizer interfacing directly to low-noise instrumentation amplifiers; timing-critical hold mode ensures consistent sampling aperture. Use Value: <50ps aperture jitter and ±0.5 LSB INL meet Class II medical device linearity requirements; RoHS/lead-free SO package supports regulatory compliance. |
Use Scenario: Analog input modules in PLCs acquiring 4–20mA loop signals or thermocouple outputs in chemical plant control cabinets. IC Role / Device Role / Timing Role: Precision ADC in modular I/O card; interfaces to FPGA or ARM-based controller via shared SPI bus with daisy-chain capability. Use Value: Internal 2.5V reference stability (±30ppm/°C) maintains accuracy across wide ambient temperatures; 8-pin SO simplifies thermal management in dense backplane layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply; no internal reference; requires external 2.5V ref; 200ksps max; 8-pin SO | Higher speed but needs external reference and biasing; less suitable for ultra-low-power battery use | Select when system already provides precision 2.5V reference and throughput >73ksps is required |
| MAX11131AUT+ | 12-bit, 500ksps; internal 4.096V ref; SPI-only interface; 6-pin SOT23; 2.7V–3.6V supply | Smaller package and higher speed, but fixed 4.096V ref limits input range flexibility vs. MAX1240's 2.5V | Select when board space is critical and full-scale input range aligns with 4.096V reference |
Compared with ADS7822U and MAX11131AUT+, the MAX1240CESA uniquely balances ultra-low power (3.7mW), integrated 2.5V reference, and guaranteed 73ksps performance in an industry-standard 8-pin SO - making it optimal for cost-sensitive, battery-operated precision acquisition where reference simplicity and long service life are primary design constraints.
Availability
MAX1240CESA is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated industrial sensors, portable medical instrumentation, and process control loop monitoring requiring stable component supply across extended production lifecycles.
Supply support for MAX1240CESA 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 MAX1240 series belongs to Maxim's precision data-acquisition product line, engineered specifically for low-power, high-accuracy 12-bit conversion in space- and energy-constrained embedded systems - emphasizing reference integration, serial interface simplicity, and robust DC/AC performance.
FAQ
What is the reference voltage architecture of the MAX1240CESA?
The MAX1240CESA features an on-chip, factory-trimmed 2.500V reference with ±20mV initial tolerance and ±30ppm/°C temperature coefficient. It is enabled when SHDN is pulled high, and requires a 4.7µF capacitor at the REF pin for stable operation and fast wake-up from shutdown. This internal reference eliminates external reference components in most designs, unlike the MAX1241 which mandates external reference sourcing.
Does the MAX1240CESA support SPI, QSPI, and MICROWIRE protocols?
Yes, the MAX1240CESA serial interface is fully compatible with SPI, QSPI, and MICROWIRE standards. It uses CPOL = 0 and CPHA = 0 configuration, outputs MSB-first unipolar data, and signals end-of-conversion (EOC) via DOUT rising edge. The interface operates at clock rates up to 2.1MHz and connects directly to standard microcontroller GPIOs without level shifters or protocol translators.
What is the maximum sampling rate and conversion time of the MAX1240CESA?
The MAX1240CESA achieves a maximum throughput rate of 73ksps with a total conversion time of 7.5µs, including internal track/hold acquisition (1.5µs) and SAR conversion. This performance is guaranteed under specified conditions: VDD = +2.7V to +3.6V, fSCLK = 2.1MHz, and TA = –40°C to +85°C. Sampling can be gated by CS falling edge with deterministic timing.
How does shutdown mode function on the MAX1240CESA?
Shutdown mode on the MAX1240CESA is activated by pulling the SHDN pin low, reducing supply current to ≤2µA. In this state, the internal reference and analog circuitry are disabled, but register state is preserved. Wake-up time depends on discharge of the 4.7µF REF bypass capacitor - typically sub-millisecond for short shutdown durations. SHDN left open disables the internal reference but keeps the device operational.
What are the absolute maximum ratings for the analog input of the MAX1240CESA?
The MAX1240CESA analog input (AIN) has an absolute maximum rating of –0.3V to (VDD + 0.3V). For accurate conversions, however, the input must remain within 0V to VREF (2.5V) and must not exceed GND by more than 50mV or VDD by more than 50mV. Input current must be limited to ≤2mA if the signal exceeds these safe operating limits to prevent damage to internal protection diodes.
MAX1240CESA 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:
- 12
- 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, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1240CESA FAQ
1.How can I place an order for MAX1240CESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1240CESA 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 MAX1240CESA reliable?
The price and inventory of MAX1240CESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1240CESA is usually 5 days.
3.What payment methods are accepted for MAX1240CESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1240CESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1240CESA?
MAX1240CESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1240CESA 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 MAX1240CESA?
For technical support, including MAX1240CESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1240CESA requirements.
6.How does Aetrix verify that MAX1240CESA is sourced from the original manufacturer or authorized distributors?
All MAX1240CESA 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 MAX1240CESA meets industry standards.
7.What is the process for return or replacement of MAX1240CESA?
All MAX1240CESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1240CESA, 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 MAX1240CESA part is unused and in its original packaging.
Return procedure for MAX1240CESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1240CESA Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
