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Analog Devices Inc./Maxim Integrated MAX1247AEEE+
- Part No.:
- MAX1247AEEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1247AEEE+.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,187
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Product details
Overview
MAX1247AEEE+ from Maxim Integrated is a 12-bit, 4-channel serial analog-to-digital converter (ADC) with integrated track/hold, software-configurable unipolar/bipolar and single-ended/differential inputs, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.7V to +5.25V supply, consumes 1.2mA at 133ksps, and supports external reference input - enabling precision data acquisition in battery-powered medical instruments and portable data loggers.
For engineers reviewing the MAX1247AEEE+ datasheet, MAX1247AEEE+ pinout, MAX1247AEEE+ application, or MAX1247AEEE+ equivalent, this page delivers verified electrical parameters, QSOP-16 package mapping, real-world use scenarios, and two confirmed alternative parts for design-in flexibility under industrial temperature requirements (–40°C to +85°C).
Technical Context
The MAX1247AEEE+ implements successive-approximation register (SAR) architecture with an internal track/hold circuit acquiring analog signals in ≤1.5µs. It supports both external clock mode (up to 2MHz SCLK, 6µs conversion time) and internal clock mode (7.5MHz typical), with configurable power-down states reducing current to 1µA.
Its analog front-end allows pseudo-differential sampling across CH0–CH3 with COM as common-mode reference, and features ±0.5LSB integral nonlinearity (INL), 73dB SINAD at 10kHz, and channel-to-channel crosstalk of –85dB - all validated over –40°C to +85°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for high-fidelity signal digitization in sensor and instrumentation systems. |
| Sampling Rate | 133ksps - enables real-time capture of fast transients in pen digitizers and process control loops. |
| INL | ±0.5 LSB (MAX1247A grade) - ensures monotonicity and <0.012% full-scale error after calibration, critical for closed-loop feedback accuracy. |
| Supply Range | +2.7V to +5.25V - supports direct interfacing with 3.3V and 5V microcontrollers without level-shifting. |
| Power Consumption | 1.2mA @ 133ksps / 1µA @ shutdown - extends battery life in portable medical devices beyond 100 hours per charge. |
| SINAD | 73dB @ 10kHz - provides >11.8 effective bits for clean spectral representation of physiological waveforms. |
| Interface | SPI/QSPI/MICROWIRE 4-wire - eliminates glue logic when connecting to TMS320 DSPs or ARM Cortex-M MCUs with standard serial peripheral controllers. |
Pinout & Package
MAX1247AEEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm), occupying the same PCB footprint as an 8-pin SO - enabling compact, space-constrained designs without layout redesign.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; requires local 0.1µF decoupling to AGND/DGND. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable single-ended or differential inputs; support up to ±VREF/2 bipolar range with COM reference. |
| COM (Pin 6) | Analog ground reference | Defines zero-code voltage in single-ended mode; must be stable to ±0.5LSB to avoid INL degradation. |
| SHDN (Pin 7) | Three-level shutdown control | Pull low for full power-down (1µA), float for external reference compensation, or pull high for internal compensation mode. |
| VREF (Pin 8) | Reference input/output | Accepts external 1.0V–(VDD+50mV) reference; buffer disabled by tying REFADJ to VDD. |
| AGND (Pin 10) | Analog ground | Must be separated from DGND and connected at single point near VDD decoupling capacitor to minimize noise coupling. |
| DGND (Pin 11) | Digital ground | Return path for digital I/O; isolation from AGND prevents digital switching noise from corrupting ADC conversions. |
| DOUT (Pin 12) | Serial data output | MSB-first, SCLK-falling-edge synchronized; high-impedance when CS = high - supports bus sharing. |
| CS (Pin 15) | Active-low chip select | Enables serial interface; falling edge initiates control byte latch; rising edge places DOUT/SSTRB in high-Z state. |
| SCLK (Pin 16) | Serial clock input | Drives data transfer and (in external clock mode) SAR conversion timing; 40–60% duty cycle required. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Unipolar/bipolar and single-ended/differential selection via 8-bit control byte - eliminates hardware jumpers and simplifies firmware-driven sensor reconfiguration. |
| Low-power shutdown states | 1µA full power-down and 54µA fast power-down - enables adaptive sampling in energy-harvesting IoT nodes with sub-10µW average power budgets. |
| Reference-buffer amplifier disable | Internal buffer disabled by pulling REFADJ to VDD - permits use of precision external references (e.g., REF5025) for <10ppm/°C system-level drift control. |
| Track/hold acquisition time | 1.5µs maximum - supports accurate sampling of 2.25MHz small-signal bandwidth inputs without external op-amp buffering. |
| TMS320-family serial strobe compatibility | SSTRB output pulses synchronously with conversion start/end - enables deterministic DMA-triggered data capture on TI C2000 and C6000 DSPs. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and CO₂ every 10 seconds using a low-quiescent LDO. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog outputs from multiple sensors; internal clock mode decouples conversion timing from host MCU scheduling. Use Value: 1µA shutdown current extends 2×AA battery life to >2 years; 4-channel mux reduces BOM count vs. discrete ADCs. | Use Scenario: ECG front-end acquiring lead-II differential signals at 1ksps with 50Hz notch filtering and baseline wander correction. IC Role / Device Role / Timing Role: Performs pseudo-differential sampling of CH0/CH1 pair; bipolar mode captures ±2.5V cardiac waveform with 12-bit resolution. Use Value: ±0.5LSB INL ensures diagnostic-grade amplitude fidelity; 73dB SINAD preserves ST-segment morphology for arrhythmia detection. |
| Pen Digitizers | Process Control |
Use Scenario: Active stylus interface in tablet detecting tip pressure and tilt angle via resistive mesh and auxiliary analog sensors. IC Role / Device Role / Timing Role: Simultaneously samples X/Y position voltages and pressure signal using CH0–CH2; unipolar mode maps 0–2.5V to 0–4095 codes. Use Value: 133ksps sampling supports >200Hz stylus reporting rate; 1.5µs acquisition time minimizes latency-induced jitter during rapid sketching. | Use Scenario: PLC analog input module monitoring 4–20mA current loops from flow, pressure, and temperature transmitters in factory automation. IC Role / Device Role / Timing Role: Digitizes isolated 4–20mA loop outputs conditioned to 0–5V range; external reference ensures traceable metrology-grade accuracy. Use Value: ±0.5LSB INL meets IEC 61000-4-30 Class A harmonic measurement tolerance; 16-pin QSOP fits dense I/O card 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 | 12-bit, 200ksps, SPI-only interface; requires external reference; no SHDN pin; 8-pin SOIC package. | Lacks three-level shutdown and COM reference pin - unsuitable for bipolar or low-power portable designs requiring flexible power management. | Select when board space is constrained and only unipolar single-ended inputs are needed; verify external reference stability meets ±0.05% requirement. |
| MAX11131AUT+T | 12-bit, 500ksps, internal reference (2.048V); SPI/QSPI compatible; 6-pin SOT23 package; –40°C to +125°C rating. | Higher speed but fixed internal reference and no differential input support - limits use in precision bipolar or externally referenced systems. | Choose for high-speed, space-limited industrial sensors where 2.048V reference suffices and differential mode is unnecessary. |
Compared with ADS7822U and MAX11131AUT+T, MAX1247AEEE+ uniquely combines external reference flexibility, true bipolar input capability, and multi-mode shutdown - making it optimal for portable, battery-sensitive, and metrology-critical applications demanding configurability and temperature robustness.
Availability
MAX1247AEEE+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and process control applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance (–40°C to +85°C).
Supply support for MAX1247AEEE+ 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 high-performance analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX1246/MAX1247 product line targets low-power, multi-channel data acquisition systems where precision, software configurability, and compact packaging are essential - especially in battery-operated and space-constrained instrumentation.
FAQ
What is the operating temperature range for MAX1247AEEE+?
The MAX1247AEEE+ is rated for –40°C to +85°C operation (industrial grade). This is confirmed by the "MAX1247_E_E" ordering suffix in the datasheet's Ordering Information table and validated across all DC and dynamic specifications in the Electrical Characteristics section. The device maintains ±0.5LSB INL and 73dB SINAD across this full range, making MAX1247AEEE+ suitable for deployment in outdoor environmental monitors and factory-floor PLC modules.
Does MAX1247AEEE+ include an internal voltage reference?
No, MAX1247AEEE+ does not include an internal voltage reference. Unlike the MAX1246 variant, the MAX1247 family requires an external reference applied to the VREF pin. The datasheet explicitly states "the MAX1247 operates from a single +2.7V to +5.25V supply" and "MAX1247-external reference, VREF = 2.5V applied to VREF pin". Internal reference functionality is exclusive to MAX1246; MAX1247AEEE+ relies on external precision references for optimal accuracy.
What package type is used for MAX1247AEEE+?
MAX1247AEEE+ uses a 16-pin QSOP (Quarter-Size Outline Package) measuring 5.3mm × 10.2mm. This is confirmed in the "Ordering Information" table listing "MAX1247AEEE+" with "16 QSOP" under PIN-PACKAGE, and further supported by the Pin Configuration diagram and mechanical drawings in the datasheet. The package is lead-free and RoHS-compliant, with gull-wing leads suitable for standard SMT reflow processes.
How does the SHDN pin function on MAX1247AEEE+?
The SHDN pin on MAX1247AEEE+ provides three distinct operating states: pulled low → full power-down (1µA supply current); left floating → external reference compensation mode (enabling external capacitor bypass at REFADJ); pulled high → internal reference compensation mode (not applicable to MAX1247AEEE+ since it lacks internal reference, but configures buffer biasing). This behavior is documented in the Pin Description table and Figure 4's functional block diagram, ensuring precise power-state control without additional logic.
Can MAX1247AEEE+ perform differential measurements?
Yes, MAX1247AEEE+ supports pseudo-differential measurements across two channel pairs: CH0/CH1 and CH2/CH3. When configured via the SGL/DIF bit (bit 2) and SEL[2:0] bits in the 8-bit control byte, it samples the voltage difference between selected inputs while maintaining COM as the stable return reference. This is validated in Tables 2 and 3 (Channel Selection) and the "Pseudo-Differential Input" section, enabling accurate ratiometric sensing in bridge-based transducer interfaces.
MAX1247AEEE+ 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:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 133k
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1247AEEE+ FAQ
1.How can I place an order for MAX1247AEEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1247AEEE+ 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 MAX1247AEEE+ reliable?
The price and inventory of MAX1247AEEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1247AEEE+ is usually 5 days.
3.What payment methods are accepted for MAX1247AEEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1247AEEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1247AEEE+?
MAX1247AEEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1247AEEE+ 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 MAX1247AEEE+?
For technical support, including MAX1247AEEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1247AEEE+ requirements.
6.How does Aetrix verify that MAX1247AEEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1247AEEE+ 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 MAX1247AEEE+ meets industry standards.
7.What is the process for return or replacement of MAX1247AEEE+?
All MAX1247AEEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1247AEEE+, 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 MAX1247AEEE+ part is unused and in its original packaging.
Return procedure for MAX1247AEEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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