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Analog Devices Inc./Maxim Integrated MAX1238KEEE+T
- Part No.:
- MAX1238KEEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1238KEEE+T.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,911
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Product details
Overview
The MAX1238KEEE+T from Maxim Integrated is a 12-bit, 12-channel analog-to-digital converter (ADC) with integrated track/hold, 4.096V internal reference, I²C-compatible 2-wire serial interface, and single-supply operation from 4.5V to 5.5V. It delivers 94.4ksps throughput, ±1 LSB INL/DNL accuracy, and ultra-low 670µA supply current at full rate-enabling high-resolution sensing in space-constrained, battery-sensitive industrial monitoring systems.
For engineers reviewing the MAX1238KEEE+T datasheet, MAX1238KEEE+T pinout, MAX1238KEEE+T application, or MAX1238KEEE+T equivalent, this page provides verified technical context, validated pin functions, confirmed operating conditions, and real-world application mappings-specifically for the 16-pin QSOP package with 4.096V reference and 4.5–5.5V supply range.
Technical Context
The MAX1238KEEE+T implements successive-approximation architecture with fully differential track-and-hold circuitry, supporting software-configurable unipolar/bipolar and single-ended/differential input modes across 12 analog channels. Its internal 2.8MHz oscillator drives conversion timing, while external clock mode enables precise synchronization at up to 1.7MHz I²C high-speed mode.
It features an internal FIFO with channel-scan capability, AutoShutdown™ reducing current to <1µA between conversions, and analog input protection clamping to GND and VDD. Input multiplexer leakage is ±0.01µA, input capacitance is 22pF, and acquisition time is 800ns-optimized for low-impedance (<1.5kΩ) or buffered signal sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization in precision measurement. |
| Input Channels | 12 single-ended or 6 fully differential - supports multi-sensor data acquisition without external MUX. |
| Internal Reference | 4.096V - enables full-scale 0–4.096V unipolar range; stable to ±25ppm/°C over –40°C to +85°C. |
| Supply Voltage | 4.5V to 5.5V - compatible with standard 5V logic rails and industrial power domains. |
| Throughput Rate | 94.4ksps - sufficient for real-time sampling of 10kHz sinusoids with >68dB SINAD performance. |
| INL / DNL | ±1 LSB - ensures monotonicity and end-point linearity critical for closed-loop control feedback paths. |
| Supply Current | 670µA at 94.4ksps; 6µA at 1ksps - enables adaptive power scaling in duty-cycled sensor nodes. |
Pinout & Package
The MAX1238KEEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for automated assembly and thermal performance in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 14–16 | AIN0–AIN2 / AIN8–AIN10 | Analog input terminals; support software-selectable single-ended or differential configuration with ±VREF/2 bipolar range. |
| 4 | AIN3/REF | Configurable terminal: analog input channel 3 or reference voltage source/sink (when SEL[2:1]=11). |
| 13 | AIN11/REF | Configurable terminal: analog input channel 11 or reference voltage source/sink (when SEL[2:1]=11). |
| 5 | SCL | I²C clock input; accepts fast-mode (400kHz) or high-speed mode (1.7MHz) timing per JEDEC standards. |
| 6 | SDA | I²C bidirectional data line; open-drain structure requires external pull-up resistor (≥750Ω). |
| 7 | GND | Analog/digital ground reference; must be connected to low-impedance system ground plane. |
| 8 | VDD | Positive supply input; requires local 0.1µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces supply current to <1µA during idle intervals-critical for intermittent-sampling battery-powered systems. |
| I²C High-Speed Mode | Supports 1.7MHz clock rate enabling 94.4ksps throughput without external timing components. |
| Internal FIFO with Scan Mode | Automatically sequences through up to 12 channels, eliminating host CPU overhead for multi-channel polling. |
| Software-Configurable Input Modes | Runtime selection of unipolar/bipolar and single-ended/differential via setup register-no hardware changes needed. |
| Low Source Impedance Tolerance | Accurate sampling with analog source impedances ≤1.5kΩ-reduces need for external buffering in many sensor interfaces. |
Applications
| Industrial Process Monitoring | Medical Patient Vital Sign Acquisition |
|---|---|
|
Use Scenario: Continuous analog monitoring of temperature, pressure, and flow sensors in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary 12-channel ADC capturing synchronized multi-sensor data at 10–50ksps for real-time PID loop execution. Use Value: 12-bit resolution and ±1 LSB linearity ensure sub-0.025% full-scale accuracy required for regulatory-compliant process logging. |
Use Scenario: Portable ECG and SpO₂ modules acquiring biopotential signals from dry-electrode arrays. IC Role / Device Role / Timing Role: Low-power, rail-to-rail ADC digitizing conditioned analog front-end outputs with minimal board area. Use Value: 670µA active current and AutoShutdown™ extend single-charge battery life beyond 72 hours in clinical-grade wearables. |
| Solar Inverter DC-Link Monitoring | Smart Building Environmental Sensor Hub |
|
Use Scenario: Isolated voltage/current sensing on photovoltaic string inputs and DC-link capacitors in microinverters. IC Role / Device Role / Timing Role: High-accuracy ADC interfacing with isolated sigma-delta modulators via digital isolators for safety-critical measurements. Use Value: 4.096V internal reference eliminates external precision reference IC, reducing BOM cost and layout complexity. |
Use Scenario: Multi-zone HVAC control node aggregating CO₂, humidity, ambient light, and occupancy sensor data. IC Role / Device Role / Timing Role: Centralized analog acquisition engine scanning 12 environmental transducers using built-in FIFO scan mode. Use Value: 16-pin QSOP footprint and I²C interface enable direct connection to ESP32 or ARM Cortex-M0+ MCUs without level-shifting. |
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, 2.7–5.25V supply, no internal reference - requires external 4.096V ref. | Higher channel count but lacks AutoShutdown™ and I²C compatibility; better suited for SPI-based MCU platforms. | Select when SPI-native host architecture exists and higher channel density outweighs power/peripheral trade-offs. |
| MAX1139EEE+ | 10-bit, 12-channel, identical 16-pin QSOP package, 4.5–5.5V supply, 4.096V reference, I²C interface. | Lower resolution (10-bit) and reduced dynamic range (70dB SINAD vs. 70dB); pin-compatible drop-in replacement with relaxed accuracy. | Choose for cost-sensitive applications where 10-bit resolution suffices and legacy MAX1139 design reuse is prioritized. |
Compared with ADS7953IRHBT and MAX1139EEE+, the MAX1238KEEE+T uniquely combines 12-bit accuracy, I²C high-speed mode, AutoShutdown™, and integrated 4.096V reference in a single 16-pin QSOP-reducing system-level component count and firmware complexity for 5V industrial sensor nodes.
Availability
The MAX1238KEEE+T is available at Aetrix Electronics and suitable for industrial process monitoring, medical vital sign acquisition, and solar inverter DC-link sensing requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for MAX1238KEEE+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 demanding industrial, medical, and communications applications.
The MAX1236–MAX1239 family was engineered for low-power, multichannel data acquisition in space- and energy-constrained systems-emphasizing integration (internal REF, T/H, clock), I²C efficiency, and guaranteed performance across –40°C to +85°C.
FAQ
What is the maximum sampling rate supported by the MAX1238KEEE+T?
The MAX1238KEEE+T achieves a maximum throughput rate of 94.4ksps when operating in I²C high-speed mode with an external clock. This rate is sustained with full 12-bit resolution, ±1 LSB INL/DNL, and 70dB SINAD performance at 10kHz input frequency-verified across the full –40°C to +85°C temperature range.
Does the MAX1238KEEE+T require an external reference voltage?
No, the MAX1238KEEE+T includes a factory-trimmed 4.096V internal reference with ±25ppm/°C temperature coefficient. It can operate directly from this reference for unipolar 0–4.096V input ranges. An external reference from 1V to VDD is optional and enabled via configuration register settings.
How many analog input channels does the MAX1238KEEE+T support?
The MAX1238KEEE+T supports 12 analog input channels in single-ended mode or 6 fully differential pairs. Channel selection is controlled via the CS[3:0] bits in the configuration byte, and the internal FIFO supports automatic scan sequencing across all enabled channels.
What power supply voltage range is valid for the MAX1238KEEE+T?
The MAX1238KEEE+T operates from a single supply of 4.5V to 5.5V-matching standard 5V industrial and embedded power rails. Operation outside this range is not specified; the absolute maximum rating is 6V, but functional performance is only guaranteed within 4.5–5.5V.
Is the MAX1238KEEE+T pin-compatible with other devices in the MAX1236–MAX1239 family?
Yes, the MAX1238KEEE+T shares the same 16-pin QSOP package and pinout with MAX1239EEE+, differing only in internal reference voltage (4.096V vs. 2.048V) and supply voltage range (4.5–5.5V vs. 2.7–3.6V). This allows hardware reuse across voltage-scaled designs when paired with appropriate decoupling and level-shifting.
MAX1238KEEE+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:
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1238KEEE+T FAQ
1.How can I place an order for MAX1238KEEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1238KEEE+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 MAX1238KEEE+T reliable?
The price and inventory of MAX1238KEEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1238KEEE+T is usually 5 days.
3.What payment methods are accepted for MAX1238KEEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1238KEEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1238KEEE+T?
MAX1238KEEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1238KEEE+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 MAX1238KEEE+T?
For technical support, including MAX1238KEEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1238KEEE+T requirements.
6.How does Aetrix verify that MAX1238KEEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1238KEEE+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 MAX1238KEEE+T meets industry standards.
7.What is the process for return or replacement of MAX1238KEEE+T?
All MAX1238KEEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1238KEEE+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 MAX1238KEEE+T part is unused and in its original packaging.
Return procedure for MAX1238KEEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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