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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:1,302
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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, confirmed shutdown behavior, real-world acquisition timing (1.5µs), and two validated alternative parts for design continuity and sourcing flexibility.
Technical Context
The MAX1247ACEE+ implements successive-approximation register (SAR) architecture with an internal track/hold circuit that acquires input signals within 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 4-channel single-ended or 2-channel differential operation, with COM pin serving as zero-reference in single-ended mode.
It features a reference-buffer amplifier with ±1.5% adjustment range at REFADJ, requires external VREF (1.0V to VDD+50mV), and provides SSTRB strobe output synchronized to conversion start/end-enabling direct interfacing with TMS320-family DSPs. Power-down modes include full (1µA), fast (54µA at 1ksps), and automatic post-conversion shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for precise measurement of small analog changes. |
| INL (Integral Nonlinearity) | ±0.5 LSB (max) - ensures monotonicity and <0.012% full-scale error across temperature (0°C to +70°C). |
| Conversion Rate | 133ksps (typ) - achieved with 2MHz external clock and 15-clock cycle; enables real-time sampling of audio-band and sensor signals. |
| Supply Voltage Range | +2.7V to +5.25V - supports direct connection to Li-ion, 3.3V, and 5V system rails without level-shifting. |
| Power Consumption | 1.2mA @ 133ksps / 54µA @ 1ksps / 1µA in power-down - enables multi-year battery life in portable instrumentation. |
| Input Configuration | Software-selectable unipolar (0V to VREF) or bipolar (±VREF/2), single-ended or differential - eliminates need for external signal conditioning circuitry. |
| SPI/QSPI/MICROWIRE Interface | 4-wire serial (DIN, DOUT, SCLK, CS) - connects directly to microcontrollers without glue logic; MSB-first, falling-edge data valid. |
Pinout & Package
MAX1247ACEE+ is housed in a 16-pin QSOP package (3.9mm × 4.9mm), occupying the same PCB footprint as an 8-pin SOIC. Pin functions are electrically validated per Maxim's official datasheet Rev 2 (10/01).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; decoupling capacitor required at pin. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-multiplexed 4 single-ended or 2 differential inputs; input leakage ±0.01µA max ensures minimal loading on high-Z sensors. |
| COM (Pin 6) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB to maintain DC accuracy. |
| SHDN (Pin 7) | Three-level shutdown control | Pull low → full shutdown (1µA); float → external compensation; pull high → internal compensation - enables flexible power management. |
| AGND (Pin 10) | Analog ground | Separate from DGND to minimize digital noise coupling into ADC core; must be connected at single point near VDD decoupling. |
| DGND (Pin 11) | Digital ground | Returns digital I/O current; isolation from AGND prevents ground bounce from corrupting conversion integrity. |
| VREF (Pin 8) | Reference input/buffer output | Accepts external 1.0V–(VDD+50mV) reference; internal buffer disabled when REFADJ = VDD - no internal reference present. |
| SCLK (Pin 16) | Serial clock input | Drives data transfer and (in external mode) conversion timing; 40–60% duty cycle required; max 2MHz frequency. |
| CS (Pin 15) | Active-low chip select | Enables serial interface; DOUT goes high-Z when CS high - allows multiple devices on shared bus. |
| DIN (Pin 14) | Serial data input | Receives 8-bit control byte (START, SEL2–SEL0, UNI/BIP, SGL/DIF, PD1, PD0) 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 - eliminates bus contention. |
| SSTRB (Pin 13) | Serial strobe output | Pulses high before MSB decision (external mode) or asserts low during conversion (internal mode) - synchronizes DSP capture timing. |
| REFADJ (Pin 9) | Reference buffer adjustment | Tie to VDD to disable internal buffer; otherwise enables ±1.5% VREF fine-tuning via external resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel multiplexer with pseudo-differential architecture | Supports simultaneous monitoring of four sensors or two differential pairs (CH0/CH1, CH2/CH3) using one ADC, reducing BOM count and board space. |
| Software-configurable input polarity and topology | Eliminates hardware rework: unipolar/bipolar and single-ended/differential modes selected via control byte - adapts to varying sensor outputs without redesign. |
| 1.5µs track/hold acquisition time | Enables accurate sampling of signals from sources with up to ~1kΩ source impedance without external buffering - simplifies front-end design. |
| Three power-down states with automatic post-conversion shutdown | Reduces average current to <60µA at reduced sampling rates - extends battery life while maintaining instant wake-up capability. |
| SSTRB output synchronized to conversion timing | Provides deterministic hardware handshake for TMS320-family DSPs, eliminating software polling and improving real-time determinism. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure over weeks. IC Role / Device Role / Timing Role: Primary ADC digitizing analog sensor outputs; performs 1ksps sampling with automatic power-down between readings. Use Value: 54µA active current at 1ksps and 1µA shutdown current enable >2-year CR2032 battery life without compromising resolution or linearity. | Use Scenario: Handheld ECG monitor acquiring lead-II differential biopotential signals with high common-mode rejection. IC Role / Device Role / Timing Role: Differential-input ADC converting amplified analog ECG waveform; uses COM pin as stable reference and SSTRB for synchronized DSP capture. Use Value: ±0.5 LSB INL and 73dB SINAD ensure diagnostic-grade fidelity; software-selectable bipolar mode matches ECG's ±2.5V swing without external op-amps. |
| Pen Digitizers | Battery-Powered Instruments |
Use Scenario: Active stylus digitizer tablet measuring X/Y electrode capacitance changes via charge-transfer ADC method. IC Role / Device Role / Timing Role: High-speed 4-channel ADC sampling multiplexed electrode arrays; uses internal clock mode for jitter-free conversion timing independent of host CPU clock. Use Value: 133ksps rate and 2.25MHz small-signal bandwidth support >100Hz stylus tracking; QSOP-16 footprint minimizes layout area in slim form factors. | Use Scenario: Field-deployable pH/mV meter operating from two AA cells, requiring precision analog measurement under variable temperature. IC Role / Device Role / Timing Role: Precision ADC accepting external 2.5V reference for stable scaling; uses REFADJ to compensate for reference drift across -20°C to +60°C. Use Value: ±1.5% REFADJ adjustment range and ±30ppm/°C VREF tempco allow calibration retention over full operating range without recalibration. |
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 |
|---|---|---|---|
| ADS7816U | 12-bit, 100ksps, single-channel, SPI-only interface; no internal track/hold; requires external sample clock. | Lacks multiplexer and track/hold - needs external circuitry for multi-channel or high-frequency sampling. | Select when only one channel is needed and system already provides precise sampling control; not drop-in for MAX1247ACEE+. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel SAR ADC; 2.7V–5.25V supply; SPI interface; internal reference optional. | Higher speed and channel count but larger 28-TSSOP package; higher typical IDD (2.2mA @ 1MSPS). | Choose for systems needing >133ksps or >4 channels; requires PCB redesign due to pin count and layout differences. |
Compared with ADS7816U and AD7490BRUZ, the MAX1247ACEE+ uniquely balances 4-channel integration, built-in track/hold, ultra-low power at medium speed, and QSOP-16 compactness - making it optimal for space- and energy-constrained portable instrumentation where channel count exceeds one but does not reach 16.
Availability
MAX1247ACEE+ is available at Aetrix Electronics and suitable for portable data logging, medical instruments, and battery-powered instruments requiring stable component supply, long-term lifecycle support, and guaranteed authentic Maxim Integrated product traceability.
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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and portable applications.
The MAX1246/MAX1247 family was engineered specifically for low-power, multi-channel data acquisition in battery-operated systems - emphasizing software configurability, minimal external components, and robust performance across voltage and temperature ranges.
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 must be stable to ±0.5 LSB for full accuracy; typical use cases employ a precision 2.5V reference. The REFADJ pin allows ±1.5% fine adjustment when configured in external compensation mode.
Does MAX1247ACEE+ support differential input mode?
Yes, MAX1247ACEE+ supports differential input mode via software configuration: set SGL/DIF = 0 in the control byte to enable two differential pairs - CH0/CH1 and CH2/CH3. In this mode, the device performs pseudo-differential sampling where only the positive input (IN+) is actively sampled, while the negative input (IN−) must remain stable to ±0.5 LSB relative to AGND during conversion.
What is the minimum acquisition time for MAX1247ACEE+?
The guaranteed maximum acquisition time (tACQ) for MAX1247ACEE+ is 1.5µs, defined as the time required for the track/hold circuit to settle after the last control bit is clocked in. This value assumes source impedance ≤1kΩ; higher impedances increase tACQ per tACQ = 9 × (RS + 9kΩ) × 16pF, requiring external RC filtering or buffering to maintain accuracy.
How does the SHDN pin function on MAX1247ACEE+?
The SHDN pin on MAX1247ACEE+ provides three distinct operating states: pulled low → full power-down (1µA); left floating → external compensation mode for REFADJ; pulled high → internal compensation mode. It does not require debouncing and responds immediately - enabling rapid transitions between active and ultra-low-power states without external circuitry.
Can MAX1247ACEE+ interface directly with a TMS320 DSP?
Yes, MAX1247ACEE+ can interface directly with TMS320-family DSPs using its SSTRB (serial strobe) output. In internal clock mode, SSTRB goes low at conversion start and high at completion; in external mode, it pulses high for one SCLK period before the MSB decision - providing hardware-synchronized timing for DMA-triggered data capture without CPU intervention.
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:
- 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:
- 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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