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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:3,361
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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. It is used in portable data loggers and battery-powered medical instruments requiring low-power, high-accuracy signal digitization.
For engineers reviewing the MAX1247AEEE datasheet, MAX1247AEEE pinout, MAX1247AEEE application, or MAX1247AEEE equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated QSOP-16 pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to this temperature-grade variant.
Technical Context
The MAX1247AEEE implements successive-approximation register (SAR) architecture with an internal track/hold circuit that acquires input signals in ≤1.5µs and supports both internal clock (up to 0.225MHz) and external clock (up to 2.0MHz) conversion modes. Its analog front-end allows software-selectable input configurations: 4 single-ended or 2 pseudo-differential channels, with COM pin defining zero-code reference.
It features a reference-buffer amplifier with ±1.5% adjustment range via REFADJ, requires external VREF (1.0V to VDD+50mV), and provides SSTRB strobe output synchronized to conversion start/end. Digital interface complies with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols without level-shifting logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step, enabling sub-0.025% full-scale accuracy in precision sensor interfaces. |
| Sampling Rate | 133ksps (max) - supports real-time acquisition of audio-band and control-loop signals without undersampling artifacts. |
| INL | ±0.5 LSB (MAX1247A grade) - ensures monotonicity and <0.012% integral nonlinearity error across full temperature range (0°C to +70°C). |
| Supply Current | 1.2mA @ 133ksps / 3V - enables continuous operation in energy-constrained systems like handheld diagnostics with <3.6mW active power. |
| Power-Down Current | 1µA - reduces system standby consumption by >99.9% versus active mode, critical for multi-year battery life in remote sensors. |
| Input Voltage Range | 0V to VREF (unipolar) or ±VREF/2 (bipolar) - accommodates both ground-referenced and AC-coupled transducer outputs without external signal conditioning. |
| Reference Input | External only (1.0V to VDD+50mV) - decouples accuracy from internal drift, allowing use of ultra-stable external references (e.g., REF5025) for metrology-grade applications. |
Pinout & Package
MAX1247AEEE is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), occupying the same PCB footprint as an 8-pin SOIC - enabling compact, space-optimized layouts in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; bypassing with 0.1µF near pin is mandatory for noise immunity. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable as single-ended (vs. COM) or differential pairs (CH0/CH1, CH2/CH3); input capacitance 16pF limits source impedance to ≤1kΩ for full AC performance. |
| COM (Pin 6) | Common-mode reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5LSB; connects to AGND or mid-supply for bipolar operation. |
| SHDN (Pin 7) | Three-level shutdown control | Low = full power-down (1µA); float = external compensation mode for REFADJ; high = internal compensation - no external pull required. |
| AGND (Pin 10) | Analog ground return | Separate from DGND; must be star-connected to minimize digital noise coupling into sensitive analog sampling path. |
| DGND (Pin 11) | Digital ground return | Return for SCLK, DIN, DOUT, CS, SSTRB; routed separately from AGND and joined at single point near VDD decoupling. |
| VREF (Pin 8) | Reference input/output | External reference input (buffer disabled); accepts 1.0V–5.3V; input resistance 18–25kΩ; requires 0.047µF bypass at REFADJ for stability. |
| SCLK (Pin 16) | Serial clock input | Drives data I/O and (in external clock mode) SAR conversion; 40–60% duty cycle required; max 2MHz frequency. |
| CS (Pin 15) | Chip select (active-low) | Enables serial interface; DOUT goes high-Z when CS high; timing-critical setup/hold (240ns) must be met for reliable communication. |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; bit 7 (START) initiates configuration; PD1/PD0 bits define clock/power-down mode. |
| DOUT (Pin 12) | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge; high-Z when CS high; load capacitance limited to 50pF for timing compliance. |
| SSTRB (Pin 13) | Serial strobe output | In external clock mode: pulses high for one SCLK period before MSB decision; in internal mode: goes low at conversion start, high at completion. |
| REFADJ (Pin 9) | Reference buffer adjustment | Tie to VDD to disable internal buffer (required for MAX1247); when enabled (MAX1246 only), adjusts VREF ±1.5% via external resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| 4-wire SPI/QSPI/MICROWIRE interface | Eliminates need for glue logic or protocol translation ICs - directly connects to TMS320 DSPs and most microcontrollers with standard serial peripherals. |
| Software-configurable input modes | Single control byte selects unipolar/bipolar and single-ended/differential operation - enables dynamic reconfiguration in firmware without hardware changes. |
| Track/hold with 1.5µs acquisition time | Supports accurate sampling of fast transients up to 2.25MHz bandwidth - sufficient for anti-alias filtering of kHz-range sensor signals. |
| Three-level SHDN pin | Enables three distinct power states (full down, fast down, operational) using only one GPIO - simplifies power sequencing in battery management firmware. |
| QSOP-16 package footprint compatibility | Shares board area with 8-pin SOIC - allows migration from simpler ADCs or dual-device layouts without PCB redesign. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over weeks. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple analog sensor outputs with low quiescent current and flexible input scaling. Use Value: 1µA shutdown current extends CR2032 battery life beyond 2 years; 4-channel mux eliminates need for external analog switches. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with high common-mode rejection. IC Role / Device Role / Timing Role: Bipolar differential ADC capturing cardiac waveforms at 1ksps with <±0.5 LSB INL for diagnostic fidelity. Use Value: ±VREF/2 input range matches typical ECG amplifier output swing; COM pin referenced to mid-supply enables true differential measurement. |
| Pen Digitizers | Process Control Sensors |
|
Use Scenario: Active stylus interface in tablet PCs measuring tip position via analog voltage from resistive grid. IC Role / Device Role / Timing Role: High-speed 4-channel ADC scanning X/Y electrode voltages with minimal latency and crosstalk. Use Value: 65dB channel-to-channel crosstalk prevents ghosting between X/Y axes; 133ksps rate supports >100Hz stylus update rates. |
Use Scenario: Industrial PLC analog input module conditioning 4–20mA current loop signals from flow/pressure transmitters. IC Role / Device Role / Timing Role: Precision ADC with external reference accepting isolated 2.5V reference for galvanically separated signal chains. Use Value: External VREF input allows traceable calibration against metrology-grade references; ±0.5 LSB INL meets SIL-2 accuracy requirements. |
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, single-supply +2.7V to +5.5V, internal reference only, SPI-compatible, 8-pin SOIC package. | Lacks software-configurable bipolar mode and differential input pairs; no REFADJ or SSTRB; smaller package but no COM pin for flexible referencing. | Select when board space is constrained and unipolar-only operation suffices; avoid if bipolar signal capture or COM-based referencing is required. |
| MAX11100ETE+ | 12-bit, 1MSPS, +2.7V to +3.6V supply, internal reference, SPI/QSPI, 16-pin TQFN (3mm × 3mm), integrated PGA. | Higher speed and integrated programmable gain amplifier; narrower supply range; no external reference support; different pinout and thermal pad. | Choose for high-throughput sensor fusion where gain flexibility matters more than wide-voltage operation or external reference traceability. |
Compared with ADS7822U and MAX11100ETE+, the MAX1247AEEE uniquely combines external reference support, three-level shutdown, COM-referenced bipolar operation, and QSOP-16 footprint compatibility - making it optimal for portable, battery-sensitive, and metrology-aware designs requiring field-serviceable calibration.
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 assurance, and guaranteed temperature-grade compliance (0°C to +70°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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications systems.
The MAX1246/MAX1247 family was designed for low-power, high-accuracy data acquisition in space- and energy-constrained environments - emphasizing flexible input configuration, minimal external components, and robust serial interfacing for microcontroller-based systems.
FAQ
What is the operating temperature range for MAX1247AEEE?
The MAX1247AEEE is rated for 0°C to +70°C ambient operation, as indicated by the "A" suffix in the part number per Maxim's ordering convention. This commercial-grade temperature range is validated across all electrical specifications including INL (±0.5 LSB), supply current, and reference input performance - ensuring reliability in indoor portable equipment and non-extreme industrial settings.
Does MAX1247AEEE include an internal voltage reference?
No, the MAX1247AEEE requires an external reference voltage applied to the VREF pin. Unlike the MAX1246 variant, the MAX1247 does not integrate an internal 2.5V reference. The internal reference buffer must be disabled by tying REFADJ to VDD, and VREF must be supplied within 1.0V to VDD+50mV with 18–25kΩ input resistance.
How is the MAX1247AEEE powered down to achieve 1µA current draw?
The MAX1247AEEE enters 1µA full power-down mode when the SHDN pin is driven low. This state disables the reference buffer, track/hold, SAR core, and digital interface - verified across the full 0°C to +70°C range. No additional register writes or timing sequences are needed; the transition occurs within microseconds of SHDN assertion.
Can MAX1247AEEE perform differential measurements between arbitrary channels?
No - the MAX1247AEEE supports only two predefined pseudo-differential pairs: CH0–CH1 and CH2–CH3. It does not allow arbitrary channel combinations (e.g., CH0–CH2). In differential mode, the negative input (IN−) must remain stable to ±0.5LSB during conversion, requiring local decoupling (e.g., 0.1µF to AGND) on the selected IN− channel.
What serial interface protocols does MAX1247AEEE support natively?
The MAX1247AEEE natively supports SPI (with CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols using its 4-wire interface (SCLK, DIN, DOUT, CS). No external level shifters or protocol converters are required - it connects directly to compatible microcontrollers and DSPs such as TMS320Cxx families via the SSTRB strobe for precise timing alignment.
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:
- Obsolete
- 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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