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Analog Devices Inc./Maxim Integrated MAX1239KEEE+T
- Part No.:
- MAX1239KEEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1239KEEE+T.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,904
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Product details
Overview
The MAX1239KEEE+T from Maxim Integrated is a 12-bit, 12-channel, low-power analog-to-digital converter with integrated track/hold, 2.048V internal reference, I²C-compatible 2-wire serial interface, and operation from 2.7V to 3.6V supply. It delivers 94.4ksps throughput, ±1 LSB INL/DNL accuracy, and auto-shutdown current <1µA-enabling high-precision sensing in battery-powered medical instruments and portable test equipment.
For engineers reviewing the MAX1239KEEE+T datasheet, MAX1239KEEE+T pinout, MAX1239KEEE+T application, or MAX1239KEEE+T equivalent, this page provides verified electrical parameters, package mapping to 16-pin QSOP, confirmed I²C timing modes (Fast/High-Speed), channel-scan FIFO operation, and real-world design implications of its unipolar/bipolar software-configurable inputs and external reference support (1V to VDD).
Technical Context
The MAX1239KEEE+T implements successive-approximation architecture with fully differential track/hold circuitry and a switched-capacitor 12-bit DAC. Its analog input mux supports 12 single-ended or 6 fully differential channels, configurable via CS[3:0] bits in the setup register.
It operates in two clock modes: internal oscillator (2.8MHz) or external SCL-driven conversion, with aperture delay as low as 30ns in High-Speed I²C mode. The device uses AutoShutdown™ to reduce IDD to ≤0.5µA between conversions at low throughput rates.
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 multiplexing |
| Supply Voltage | 2.7V to 3.6V - compatible with Li-ion and 3.3V system rails, eliminating level-shifting needs |
| Internal Reference | 2.048V ±40mV - provides stable full-scale range; supports ratiometric measurements when paired with 2.048V sensor outputs |
| INL / DNL | ±1 LSB - ensures monotonicity and ≤0.024% full-scale linearity error across -40°C to +85°C |
| Throughput Rate | 94.4ksps (High-Speed I²C) - captures transients up to ~3MHz bandwidth using undersampling techniques |
| Supply Current | 670µA at 94.4ksps; 6µA at 1ksps - enables >1-year battery life in low-duty-cycle remote sensing nodes |
Pinout & Package
The MAX1239KEEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), optimized for space-constrained portable designs and compatible with standard surface-mount reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 14–16 | AIN0–AIN2, AIN8–AIN10 | Analog input terminals; support software-selectable unipolar/bipolar and single-ended/differential configurations |
| 4 | AIN3/REF | Configurable terminal: analog input #3 or reference voltage source/sink (when SEL[2:1]=11) |
| 13 | AIN11/REF | Configurable terminal: analog input #11 or reference voltage source/sink (when SEL[2:1]=11) |
| 5 | SCL | I²C clock input; supports Fast Mode (400kHz) and High-Speed Mode (1.7MHz) with programmable timing |
| 6 | SDA | I²C bidirectional data line; requires external pull-up; handles address, setup, and conversion result transfers |
| 7 | GND | Analog/digital ground reference; must be connected to low-impedance system ground plane |
| 8 | VDD | Positive supply input; bypass with 0.1µF ceramic capacitor placed adjacent to pin per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable unipolar/bipolar input | Enables seamless measurement of both positive-only (e.g., temperature sensors) and bipolar (e.g., bridge transducers) signals without hardware changes |
| Internal FIFO with channel-scan mode | Automatically sequences through all 12 channels and buffers results-reducing host CPU polling overhead and enabling deterministic sampling intervals |
| I²C High-Speed Mode (1.7MHz) | Reduces conversion readout time to <13µs per sample, critical for closed-loop control systems requiring sub-100µs latency |
| AutoShutdown™ between conversions | Eliminates need for external power-gating logic; cuts average current by >99% during idle periods in intermittent-sampling applications |
| External reference support (1V to VDD) | Permits use of precision external references (e.g., REF5025) to achieve <0.5ppm/°C drift or match sensor excitation voltage |
Applications
| Handheld Portable Applications | Medical Instruments |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter acquiring voltage, current, and resistance readings with auto-ranging. IC Role / Device Role / Timing Role: Primary ADC capturing 12-channel front-end sensor data with on-chip reference stability and I²C burst reads. Use Value: 2.048V reference aligns with common 2.5V or 3.3V microcontroller ADC references, simplifying calibration; 670µA active current extends AA-cell life beyond 6 months. |
Use Scenario: Portable ECG monitor measuring lead voltages across multiple electrodes with noise rejection. IC Role / Device Role / Timing Role: 6-channel differential ADC digitizing amplified biopotential signals with programmable gain and bipolar input range. Use Value: Fully differential input architecture rejects common-mode interference; ±1 LSB INL ensures accurate ST-segment analysis per AHA guidelines. |
| Battery-Powered Test Equipment | Solar-Powered Remote Systems |
|
Use Scenario: Field-deployable environmental logger recording temperature, humidity, and light intensity over weeks. IC Role / Device Role / Timing Role: Multi-channel sensor hub ADC with channel-scan FIFO and ultra-low shutdown current. Use Value: AutoShutdown™ reduces average current to <1µA between 10s-interval samples-enabling >5-year operation on a single CR2032 coin cell. |
Use Scenario: Off-grid solar charge controller monitoring panel voltage, battery SOC, and load current. IC Role / Device Role / Timing Role: Ratiometric ADC using external shunt and 2.048V reference to reject supply rail variation in 12V/24V systems. Use Value: PSRR of ±0.5 LSB/V ensures accurate current measurement despite solar panel voltage ripple; 12-channel capability consolidates three separate ADCs. |
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 I²C compatibility | Select when SPI infrastructure exists and >12 channels needed; avoid if I²C bus is constrained or reference integration is required |
| AD7938BRUZ | 12-bit, 8-channel, parallel interface, 2.7V–5.25V, 4.096V internal reference | Parallel interface increases PCB routing complexity; fixed 4.096V reference incompatible with 3.3V systems | Prefer for high-speed parallel-read systems where timing margin allows; not suitable for space-limited or I²C-based designs |
Compared with ADS7953IRHBT and AD7938BRUZ, the MAX1239KEEE+T uniquely combines I²C simplicity, integrated 2.048V reference, 12-channel flexibility, and sub-1µA shutdown-making it optimal for compact, battery-sensitive, and firmware-light embedded systems.
Availability
The MAX1239KEEE+T 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 MAX1239KEEE+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX1236–MAX1239 family was designed for ultra-low-power, multichannel data acquisition in portable and energy-harvesting systems-emphasizing integration (reference, T/H, clock), I²C efficiency, and extended temperature reliability.
FAQ
What is the maximum sampling rate supported by the MAX1239KEEE+T?
The MAX1239KEEE+T achieves a maximum throughput rate of 94.4ksps when operating in I²C High-Speed Mode (1.7MHz SCL). This requires the master to issue the HS-mode master code (0000 1XXX) first, followed by a repeated START and the device's slave address (0110101). In Fast Mode (400kHz), the maximum rate drops to 22.2ksps.
Does the MAX1239KEEE+T require an external reference voltage?
No, the MAX1239KEEE+T includes a factory-trimmed 2.048V internal reference with ±40mV initial accuracy and 25ppm/°C temperature coefficient. An external reference (1V to VDD) may be used instead by configuring the setup register-enabling improved stability or ratiometric matching with external sensors or DACs.
How many analog input channels does the MAX1239KEEE+T support, and how are they configured?
The MAX1239KEEE+T supports 12 analog input channels (AIN0–AIN11), configurable as either 12 single-ended inputs or 6 fully differential pairs. Configuration is controlled via the CS[3:0] bits in the setup byte and the SGL/DIF bit-allowing dynamic reconfiguration without hardware changes.
What package type is used for the MAX1239KEEE+T, and what are its key mechanical features?
The MAX1239KEEE+T uses a 16-pin QSOP package (5.3mm × 10.2mm body, 0.635mm lead pitch). It is RoHS-compliant (+ suffix), rated for -40°C to +85°C operation, and features gull-wing leads compatible with standard reflow soldering processes and automated optical inspection.
Can the MAX1239KEEE+T operate in bipolar input mode, and how is it enabled?
Yes, the MAX1239KEEE+T supports bipolar input mode-but only in differential configuration. It is enabled by setting the BIP/UNI bit in the setup byte (Table 1); this configures the differential input range to ±VREF/2 (±1.024V) with two's complement output coding. Single-ended operation is always unipolar (0V to VREF).
MAX1239KEEE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -
MAX1239KEEE+T FAQ
1.How can I place an order for MAX1239KEEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1239KEEE+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 MAX1239KEEE+T reliable?
The price and inventory of MAX1239KEEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1239KEEE+T is usually 5 days.
3.What payment methods are accepted for MAX1239KEEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1239KEEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1239KEEE+T?
MAX1239KEEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1239KEEE+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 MAX1239KEEE+T?
For technical support, including MAX1239KEEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1239KEEE+T requirements.
6.How does Aetrix verify that MAX1239KEEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1239KEEE+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 MAX1239KEEE+T meets industry standards.
7.What is the process for return or replacement of MAX1239KEEE+T?
All MAX1239KEEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1239KEEE+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 MAX1239KEEE+T part is unused and in its original packaging.
Return procedure for MAX1239KEEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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