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Analog Devices Inc./Maxim Integrated MAX1239LEEE+
- Part No.:
- MAX1239LEEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1239LEEE+.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,954
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Product details
Overview
The MAX1239LEEE+ from Maxim Integrated is a 12-bit, 12-channel, low-power analog-to-digital converter (ADC) with integrated track/hold, 2.048V internal reference, I²C-compatible 2-wire serial interface, and operation from a single 2.7V–3.6V supply. It delivers 94.4ksps throughput, ±1 LSB INL, and consumes only 670µA at max rate-enabling high-precision sensing in battery-powered medical instruments and portable test equipment.
For engineers reviewing the MAX1239LEEE+ datasheet, MAX1239LEEE+ pinout, MAX1239LEEE+ application, or MAX1239LEEE+ equivalent, key selection considerations include its 12-channel single-ended / 6-channel differential input flexibility, software-configurable unipolar/bipolar mode, AutoShutdown™ sub-1µA power-down current, and QSOP-16 package compatibility with space-constrained embedded systems.
Technical Context
The MAX1239LEEE+ employs successive-approximation architecture with fully differential track/hold circuitry and an internal 2.8MHz oscillator. Its analog front-end supports configurable single-ended or differential acquisition across 12 inputs, with input range determined by either the 2.048V internal reference or an external 1V–VDD source.
It implements a high-speed 2-wire interface compliant with I²C Fast Mode (400kHz) and High-Speed Mode (1.7MHz), requiring explicit HS-mode entry via master code. Conversion timing is synchronized to SCL in external clock mode (10.6µs conversion time) or internally gated (7.5µs), with aperture delay as low as 30ns in HS-mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization |
| Input Channels | 12 single-ended or 6 fully differential - enables multi-sensor monitoring without external mux |
| Internal Reference | 2.048V ±40mV - provides stable scaling for unipolar 0–2.048V or bipolar ±1.024V full-scale ranges |
| Supply Voltage | 2.7V to 3.6V - compatible with Li-ion and 3.3V system rails, eliminating level-shifting needs |
| Throughput Rate | 94.4ksps - supports real-time capture of audio-band and control-loop signals |
| INL / DNL | ±1 LSB / ±1 LSB - ensures monotonicity and <0.025% full-scale linearity error over temperature |
| Power Consumption | 670µA at 94.4ksps; 0.5µA in AutoShutdown™ - extends battery life in intermittent-sampling applications |
Pinout & Package
The MAX1239LEEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), optimized for automated assembly and thermal performance in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 4–8, 14–16 | AIN0–AIN10 | Analog input channels - support software-selectable single-ended or differential pairing |
| 13 | AIN11/REF | Configurable analog input or reference I/O - enables external reference injection or internal ref output |
| 5 | SCL | Serial clock input - controls data transfer timing and determines conversion clock in external mode |
| 6 | SDA | Serial data I/O - bidirectional line for setup register writes and 12-bit conversion result reads |
| 7 | GND | Analog/digital ground reference - requires low-impedance connection to minimize noise coupling |
| 12 | VDD | Positive supply - must be bypassed with 0.1µF ceramic capacitor near the pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces supply current to <1µA between conversions - eliminates need for external power gating logic |
| I²C High-Speed Mode | 1.7MHz bus rate - cuts conversion readout time by >4× vs. standard 100kHz I²C, improving system responsiveness |
| Internal FIFO + Channel-Scan | Automates sequential sampling across up to 12 channels - reduces host CPU overhead and firmware complexity |
| Software-Configurable Input Modes | Runtime selection of unipolar/bipolar, single-ended/differential via setup register - enables one hardware design to serve multiple sensor types |
| Low Source-Impedance Tolerance | Accurate sampling with ≤1.5kΩ source impedance - avoids mandatory op-amp buffering in many industrial sensor interfaces |
Applications
| Handheld Portable Applications | Medical Instruments |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter acquiring voltage, current, and temperature readings. IC Role / Device Role / Timing Role: Primary ADC capturing 12-channel sensor data with on-demand high-speed bursts and deep sleep between measurements. Use Value: 670µA active current and 0.5µA shutdown enable >1-year battery life; 2.048V reference ensures consistent 0.5mV LSB resolution across operating voltage range. |
Use Scenario: Portable ECG monitor digitizing lead voltages and auxiliary biopotential signals. IC Role / Device Role / Timing Role: Multi-channel analog front-end ADC providing simultaneous sampling of differential electrode pairs with programmable gain and offset cancellation. Use Value: Fully differential input architecture and ±1 LSB INL preserve signal integrity; 5MHz analog bandwidth supports accurate R-wave detection and ST-segment analysis. |
| Battery-Powered Test Equipment | Solar-Powered Remote Systems |
|
Use Scenario: Field-deployable environmental logger measuring temperature, humidity, and light intensity over extended periods. IC Role / Device Role / Timing Role: Low-power sensor hub ADC performing scheduled channel scans and storing results in host microcontroller memory. Use Value: Internal FIFO and channel-scan mode reduce host wake-ups; AutoShutdown™ ensures <1µA quiescent draw during 10-minute sampling intervals. |
Use Scenario: Off-grid solar charge controller monitoring panel voltage, battery state, and load current using photovoltaic and shunt-based sensors. IC Role / Device Role / Timing Role: Precision measurement ADC interfacing with isolated amplifiers and voltage dividers in harsh, variable-temperature environments. Use Value: ±0.3ppm/°C gain tempco and 25ppm/°C reference stability maintain accuracy across -40°C to +85°C; 2.7V–3.6V operation matches buck-boost regulator output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | 12-bit, 16-channel, SPI interface, 2.7V–5.25V supply, no internal reference | Requires external reference and SPI host; higher channel count but lacks AutoShutdown™ | Choose when SPI is preferred and external reference is already available in system |
| AD7923BRUZ | 12-bit, 4-channel, SPI interface, 2.7V–5.25V supply, no internal reference, 1MSPS max rate | Higher speed but fewer channels; no integrated T/H or reference; requires external driver for high-Z sources | Choose for higher throughput in 4-channel systems where layout space allows external components |
Compared with ADS7953IRHBT and AD7923BRUZ, the MAX1239LEEE+ uniquely integrates I²C interface, 2.048V reference, AutoShutdown™, and 12-channel flexibility in a single QSOP-16 package-reducing BOM count and PCB area while simplifying firmware for low-power embedded designs.
Availability
The MAX1239LEEE+ is available at Aetrix Electronics and suitable for handheld portable applications, medical instruments, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1239LEEE+ 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 demanding industrial, medical, and communications applications.
The MAX1236–MAX1239 family was designed for ultra-low-power, multichannel data acquisition in space- and energy-constrained systems-emphasizing integration of reference, clock, T/H, and I²C interface to minimize external components.
FAQ
What is the maximum sampling rate supported by the MAX1239LEEE+?
The MAX1239LEEE+ achieves a maximum throughput rate of 94.4ksps when operating in I²C High-Speed Mode (1.7MHz SCL) with external clocking. This rate is sustained across all 12 input channels in channel-scan mode and is validated over the full -40°C to +85°C temperature range. Internal clock mode supports up to 51ksps.
Does the MAX1239LEEE+ require an external reference voltage?
No, the MAX1239LEEE+ includes a factory-trimmed 2.048V internal reference with ±40mV initial accuracy and 25ppm/°C temperature coefficient. It can operate directly from this reference or accept an external 1V–VDD reference applied to the AIN11/REF pin-providing design flexibility without mandatory external components.
How does the AutoShutdown™ feature function in the MAX1239LEEE+?
AutoShutdown™ automatically powers down the MAX1239LEEE+ between conversions when no new command is received, reducing supply current to less than 1µA. This occurs without host intervention and resumes instantly upon next I²C address match, making it ideal for duty-cycled sensor monitoring in battery-powered systems.
What package type is used for the MAX1239LEEE+?
The MAX1239LEEE+ uses a 16-pin QSOP (Quarter-Size Outline Package) with 0.635mm lead pitch and 5.3mm × 10.2mm body dimensions. This RoHS-compliant, lead-free package supports fine-pitch automated assembly and provides adequate thermal dissipation for continuous 670µA operation.
Can the MAX1239LEEE+ perform differential measurements?
Yes, the MAX1239LEEE+ supports fully differential measurements across six independent channel pairs (e.g., AIN0–AIN1, AIN2–AIN3, etc.) using its software-configurable analog input multiplexer. In differential mode, it accepts bipolar inputs up to ±1.024V (with internal 2.048V reference) and outputs results in two's complement format.
MAX1239LEEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 94.4k
- Number of Inputs:
- 6, 12
- Input Type:
- Differential, Single Ended
- Data Interface:
- I2C
- 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:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1239LEEE+ FAQ
1.How can I place an order for MAX1239LEEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1239LEEE+ 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 MAX1239LEEE+ reliable?
The price and inventory of MAX1239LEEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1239LEEE+ is usually 5 days.
3.What payment methods are accepted for MAX1239LEEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1239LEEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1239LEEE+?
MAX1239LEEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1239LEEE+ 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 MAX1239LEEE+?
For technical support, including MAX1239LEEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1239LEEE+ requirements.
6.How does Aetrix verify that MAX1239LEEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1239LEEE+ 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 MAX1239LEEE+ meets industry standards.
7.What is the process for return or replacement of MAX1239LEEE+?
All MAX1239LEEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1239LEEE+, 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 MAX1239LEEE+ part is unused and in its original packaging.
Return procedure for MAX1239LEEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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