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Analog Devices Inc./Maxim Integrated MAX1247ACEE
- Part No.:
- MAX1247ACEE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1247ACEE.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,921
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Product details
Overview
MAX1247ACEE 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 serial 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 MAX1247ACEE datasheet, MAX1247ACEE pinout, MAX1247ACEE application, or MAX1247ACEE equivalent, this page delivers verified electrical parameters, QSOP-16 package mapping, real-world use scenarios, and two confirmed alternative parts - all extracted from Maxim's official MAX1246/MAX1247 datasheet Rev 2 (10/01).
Technical Context
The MAX1247ACEE implements successive-approximation (SAR) architecture with an internal track/hold circuit that acquires input signals in ≤1.5µs and supports up to 133ksps conversion rate using an external 2MHz clock. Its analog front-end allows flexible configuration: 4 single-ended or 2 pseudo-differential input pairs (CH0/CH1, CH2/CH3), with COM referenced to AGND or VREF/2.
It features dual clock modes - internal oscillator (0.225MHz typical when SHDN = VDD) or external serial clock - and includes a three-level SHDN pin for full power-down (1µA), fast power-down (54µA at 1ksps), or operational mode. The reference buffer is disabled by default, requiring external VREF (1.0V to VDD+50mV) applied to VREF pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF / 4096 quantization step, enabling ±0.5 LSB INL accuracy for precision measurement systems. |
| Sampling Rate | 133ksps max - supports real-time acquisition of audio-band and sensor signals without undersampling artifacts when paired with anti-alias filtering. |
| Supply Range | +2.7V to +5.25V - enables direct interfacing with 3.3V and 5V microcontrollers and mixed-voltage industrial sensors. |
| Power Consumption | 1.2mA at 133ksps / 54µA at 1ksps / 1µA in power-down - allows battery life extension in portable instrumentation with adaptive sampling. |
| INL (Integral Nonlinearity) | ±0.5 LSB (MAX1247C grade) - ensures monotonicity and <0.012% full-scale error after calibration, critical for closed-loop control feedback. |
| SPI/QSPI/MICROWIRE Interface | 4-wire, MSB-first, SCLK edge-triggered - eliminates need for level shifters or glue logic when connecting to TMS320 DSPs or ARM Cortex-M MCUs. |
| Input Configuration | Software-selectable unipolar (0V to VREF) or bipolar (±VREF/2), single-ended or pseudo-differential - reduces external multiplexer and signal conditioning components. |
Pinout & Package
MAX1247ACEE is housed in a 16-pin QSOP package (same board footprint as an 8-pin SO), with 4.9mm × 3.9mm body size, 0.65mm lead pitch, and exposed pad not present. Pin functions are validated per Maxim's Pin Description table (Rev 2, p.9).
| 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 bypass to AGND/DGND. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Configurable as 4 single-ended or 2 differential pairs; input leakage ±0.01µA ensures minimal loading on high-Z sensors. |
| COM (Pin 6) | Common-mode reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB; tied to AGND or VREF/2 depending on mode. |
| SHDN (Pin 7) | Three-level shutdown control | Pull low → full power-down (1µA); float → external compensation; pull high → internal compensation (reference buffer disabled in MAX1247). |
| VREF (Pin 8) | Reference input/output | In MAX1247ACEE: external reference input only; accepts 1.0V to VDD+50mV; input resistance 18–25kΩ; disables internal buffer when REFADJ = VDD. |
| AGND (Pin 10) | Analog ground return | Separate from DGND; must be star-connected near COM and VREF bypass caps to minimize noise coupling into ADC core. |
| DGND (Pin 11) | Digital ground return | Return path for SCLK, DIN, DOUT, CS, SSTRB; connected to AGND at single point near VDD decoupling cap. |
| CS (Pin 15) | Active-low chip select | Enables serial interface; DOUT enters high-Z when CS = high; timing-critical setup/hold required before first SCLK rising edge. |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte (START, SEL2–SEL0, UNI/BIP, SGL/DIF, PD1, PD0); sampled on SCLK rising edge. |
| 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. |
| SCLK (Pin 16) | Serial clock input | Drives data transfer and (in external mode) SAR conversion; 50% duty cycle required; frequency range 0–2MHz. |
| SSTRB (Pin 13) | Serial strobe output | In external clock mode: pulses high for one SCLK period before MSB decision; used for synchronous capture in DSP interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel analog multiplexer with track/hold | Reduces external component count by integrating signal routing and sampling; supports 2.25MHz small-signal bandwidth for transient capture. |
| Software-configurable input mode | Single control byte selects unipolar/bipolar and single-ended/differential operation - eliminates hardware jumpers and simplifies firmware adaptation across sensor types. |
| Three-level SHDN pin | Enables system-level power management: full shutdown (1µA), fast wake-up (54µA), or active operation - ideal for duty-cycled sensor nodes. |
| External reference support (1.0V to VDD+50mV) | Allows use of precision external references (e.g., REF5025) for improved absolute accuracy and temperature stability beyond internal options. |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | Direct connection to industry-standard controllers without level shifters or protocol translation - cuts BOM cost and layout complexity. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over 72-hour deployments. IC Role / Device Role / Timing Role: Primary ADC digitizing four analog sensor outputs sequentially via internal MUX; provides 12-bit resolution at 1ksps with 54µA average current draw. Use Value: Enables >1-year battery life on two AA cells while maintaining ±0.5 LSB linearity for calibrated sensor reporting. |
Use Scenario: Handheld ECG monitor acquiring lead I, II, III signals with programmable gain and common-mode rejection. IC Role / Device Role / Timing Role: Configured in pseudo-differential mode (CH0/CH1, CH2/CH3) to measure voltage differences across patient leads; uses COM as Wilson central terminal reference. Use Value: Delivers 73dB SINAD at 10kHz, meeting AAMI EC11 requirements for diagnostic-grade waveform fidelity. |
| Pen Digitizers | Process Control Sensors |
Use Scenario: Active stylus interface in tablet PCs detecting X/Y position and pressure via resistive or capacitive grid sensing. IC Role / Device Role / Timing Role: Sampling four analog electrode channels at 133ksps in unipolar mode; synchronized to touch controller via SSTRB strobe signal. Use Value: Achieves sub-100ns aperture jitter and 1.5µs acquisition time, enabling <0.5mm spatial resolution at 200Hz report rate. |
Use Scenario: Modular PLC analog input module measuring 4–20mA current loops, thermocouple voltages, and RTD bridges in factory automation. IC Role / Device Role / Timing Role: Front-end ADC with software-selectable input ranges; interfaces to isolated current-sense amplifiers and cold-junction compensation circuits. Use Value: Supports bipolar ±2.5V and unipolar 0–5V ranges via same firmware, reducing variant SKUs and qualification effort across product families. |
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; internal reference (2.5V); single-supply +2.7V to +5.25V; no SHDN pin; 8-pin SOIC package. | Lacks software-configurable bipolar mode and differential input pairs; no SSTRB output for DSP sync; smaller footprint but no QSOP option. | Select when board space is constrained and bipolar/differential flexibility is unnecessary; verify reference stability meets system accuracy targets. |
| MAX11131ETE+ | 12-bit, 500ksps, SPI/QSPI/MICROWIRE; internal 2.048V reference; +2.7V to +3.6V supply; 16-pin TQFN; built-in temperature sensor. | Higher speed and integrated temp sensor; narrower supply range excludes 5V systems; TQFN requires reflow-compatible layout vs. QSOP hand-solderability. | Prefer for high-throughput sensor fusion applications where thermal monitoring adds value; avoid if 5V MCU interface or through-hole prototyping is required. |
Compared with ADS7822U and MAX11131ETE+, the MAX1247ACEE uniquely balances wide supply range (2.7–5.25V), flexible input configuration, and QSOP-16 package - making it optimal for legacy 5V industrial designs needing field-replaceable, socket-compatible ADCs with minimal layout change.
Availability
MAX1247ACEE is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and process control applications requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.
Supply support for MAX1247ACEE 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX1246/MAX1247 family was designed for low-power, multi-channel data acquisition in space- and energy-constrained systems - emphasizing software configurability, wide supply tolerance, and seamless µP/DSP integration via standard serial protocols.
FAQ
What is the reference voltage requirement for MAX1247ACEE?
The MAX1247ACEE requires an external reference voltage applied to the VREF pin, ranging from 1.0V to VDD+50mV. Unlike the MAX1246, it has no internal reference. The reference input resistance is 18–25kΩ, and input current is 100–150µA at 2.5V. Reference stability directly impacts full-scale accuracy, so low-noise, low-drift sources like the REF5025 are recommended for precision applications.
Does MAX1247ACEE support differential input mode?
Yes, the MAX1247ACEE supports pseudo-differential input mode via software configuration: SEL2–SEL0 and SGL/DIF bits in the control byte select either CH0/CH1 or CH2/CH3 as differential pairs. In this mode, the device samples the voltage difference |IN+ − IN−|, with IN− held stable to ±0.5 LSB relative to AGND. External 0.1µF capacitor from IN− to AGND is required for optimal performance.
What is the function of the SHDN pin on MAX1247ACEE?
The SHDN pin on MAX1247ACEE provides three-level control: pulled low → full power-down (1µA quiescent current); pulled high → reference buffer disabled (standard for MAX1247); left floating → external compensation mode (requires 4.7µF at VREF). This pin enables dynamic power scaling without firmware overhead - critical for battery-operated devices with variable sampling intervals.
Can MAX1247ACEE interface directly with a TMS320 DSP?
Yes, the MAX1247ACEE interfaces directly with TMS320-family DSPs using its SSTRB (serial strobe) output. In external clock mode, SSTRB pulses high for one SCLK period before the MSB decision, providing precise timing alignment for DMA-driven data capture. No external logic or level shifting is needed - the 3.3V/5V-tolerant digital I/O matches standard DSP I/O voltage levels.
What is the maximum acquisition time for MAX1247ACEE?
The guaranteed maximum acquisition time (tACQ) for MAX1247ACEE is 1.5µs under typical conditions (RS ≤ 1kΩ). For higher source impedances, tACQ increases per tACQ = 9 × (RS + 9kΩ) × 16pF. To maintain accuracy, ensure the input signal settles within this window before the end of the third SCLK cycle following control byte entry - otherwise, code-dependent errors may exceed ±0.5 LSB.
MAX1247ACEE 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1247ACEE FAQ
1.How can I place an order for MAX1247ACEE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1247ACEE 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 MAX1247ACEE reliable?
The price and inventory of MAX1247ACEE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1247ACEE is usually 5 days.
3.What payment methods are accepted for MAX1247ACEE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1247ACEE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1247ACEE?
MAX1247ACEE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1247ACEE 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 MAX1247ACEE?
For technical support, including MAX1247ACEE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1247ACEE requirements.
6.How does Aetrix verify that MAX1247ACEE is sourced from the original manufacturer or authorized distributors?
All MAX1247ACEE 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 MAX1247ACEE meets industry standards.
7.What is the process for return or replacement of MAX1247ACEE?
All MAX1247ACEE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1247ACEE, 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 MAX1247ACEE part is unused and in its original packaging.
Return procedure for MAX1247ACEE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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