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Analog Devices Inc./Maxim Integrated MAX1247BEEE-T
- Part No.:
- MAX1247BEEE-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1247BEEE-T.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,640
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Product details
Overview
MAX1247BEEE-T 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 (3V), and supports external reference input at VREF pin. It is used in portable data logging and battery-powered medical instruments where low power and flexible input configuration are critical.
For engineers reviewing the MAX1247BEEE-T datasheet, MAX1247BEEE-T pinout, MAX1247BEEE-T application, or MAX1247BEEE-T equivalent, this page delivers verified electrical parameters, QSOP-16 package mapping, confirmed shutdown modes (full/fast power-down), real-world acquisition time (1.5µs), and two validated alternative ADCs for similar 12-bit, serial, multi-channel acquisition roles.
Technical Context
The MAX1247BEEE-T uses 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 when SHDN = VDD) and external clock (up to 2.0MHz) conversion modes. Its analog front-end allows software-selectable channel configuration via 8-bit control byte including SEL2–SEL0, UNI/BIP, SGL/DIF, and PD1/PD0 bits.
It features a reference-buffer amplifier with ±1.5% adjustment range at REFADJ, requires external VREF (1.0V to VDD+50mV), and provides differential nonlinearity of ±1.0 LSB (typical) and integral nonlinearity of ±1.0 LSB over 0°C to +70°C. Channel-to-channel offset matching is ±0.25 LSB, supporting precision multi-sensor acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for high-fidelity signal digitization |
| Sampling Rate | 133ksps - enables real-time capture of audio-band and sensor signals up to ~66kHz Nyquist |
| INL / DNL | ±1.0 LSB / ±1.0 LSB - ensures monotonicity and <0.025% full-scale error for calibrated measurements |
| Supply Range | +2.7V to +5.25V - supports direct interfacing with 3.3V and 5V microcontrollers without level-shifting |
| Power Consumption | 1.2mA @ 133ksps, 3V - enables >100-hour operation on a 300mAh Li-ion cell at moderate sampling rates |
| Reference Input | VREF pin accepts 1.0V to VDD+50mV - allows use of precision external references (e.g., REF5025) for metrology-grade accuracy |
| Interface Protocol | SPI/QSPI/MICROWIRE 4-wire - directly connects to standard MCU serial peripherals without glue logic |
Pinout & Package
MAX1247BEEE-T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), occupying the same PCB footprint as an 8-pin SOIC - enabling compact, space-constrained designs.
| 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 |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable as single-ended (vs. COM) or pseudo-differential (CH0/CH1, CH2/CH3); max input swing AGND−0.3V to VDD+0.3V |
| COM (Pin 6) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5LSB for <12-bit error |
| SHDN (Pin 7) | Three-level shutdown control | Low = full shutdown (1µA); float = external ref compensation; high = internal ref compensation (MAX1246 only) |
| REFADJ (Pin 9) | Reference buffer adjust | Tie to VDD to disable internal buffer; otherwise enables ±1.5% VREF tuning via external resistor divider |
| VREF (Pin 8) | Reference input/output | Input-only for MAX1247; accepts external 1.0V–VDD+50mV reference; 18–25kΩ input impedance |
| SCLK (Pin 16) | Serial clock input | Drives data I/O and (in external clock mode) SAR conversion; 40–60% duty cycle required |
| CS (Pin 15) | Active-low chip select | Enables serial interface; DOUT and SSTRB go high-Z when CS = high |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; defines channel, polarity, mode, and clock source |
| DOUT (Pin 12) | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge; high-Z when CS = high |
| SSTRB (Pin 13) | Serial strobe output | Pulses high before MSB in external clock mode; goes low at conversion start and high at completion in internal clock mode |
| AGND (Pin 10) | Analog ground | Return for analog inputs and reference; must be separated from DGND and tied at single point |
| DGND (Pin 11) | Digital ground | Return for digital I/O; isolation from AGND minimizes digital noise coupling into ADC |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel multiplexer with software-selectable input mode | Reduces BOM count and board area vs. discrete channel selection; supports both single-ended and pseudo-differential acquisition in one device |
| Two power-down modes (full/fast) | Enables dynamic power scaling: full shutdown draws 1µA; fast shutdown retains register state and wakes in <1µs for burst sampling |
| External reference input with 18–25kΩ impedance | Allows integration of ultra-stable references (e.g., ADR45xx) for <10ppm/°C system gain drift in precision instrumentation |
| 1.5µs track/hold acquisition time | Supports accurate sampling of signals from sources with ≤1kΩ output impedance without external buffering |
| SPI/QSPI/MICROWIRE compatibility with no external logic | Eliminates level shifters or protocol translators - interfaces directly with STM32, MSP430, and TMS320 DSP families |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure every 10 seconds for 6 months. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog outputs from multiple sensors using single-ended mode and external 2.5V reference for consistent full-scale definition. Use Value: 1.2mA active current and 1µA shutdown enable >180-day runtime on a 1200mAh Li-SOCl₂ cell; QSOP-16 footprint saves PCB area vs. discrete solutions. | Use Scenario: Handheld ECG monitor acquiring lead-II differential signals at 1ksps with real-time QRS detection. IC Role / Device Role / Timing Role: Configured in differential mode (CH0/CH1) with COM grounded; uses internal clock mode to decouple conversion timing from host MCU bus activity. Use Value: ±0.25 LSB channel-to-channel offset matching ensures amplitude consistency across leads; 1.5µs acquisition supports anti-alias filtering with minimal phase distortion. |
| Pen Digitizers | Battery-Powered Instruments |
Use Scenario: Active stylus digitizer tablet capturing X/Y position and pressure with 12-bit resolution at 200Hz. IC Role / Device Role / Timing Role: Samples four analog channels (X+, X−, Y+, Y−) sequentially in pseudo-differential mode; uses SSTRB to synchronize host readout. Use Value: 133ksps maximum rate allows oversampling for noise reduction; software-configurable UNI/BIP enables seamless transition between pressure (unipolar) and position (bipolar) measurement ranges. | Use Scenario: Field-deployable pH/ORP meter requiring 12-bit linearity and <100ppm total error over 0–50°C. IC Role / Device Role / Timing Role: Interfaces with external 2.5V ultra-low-drift reference (ADR4525); operates in internal clock mode to avoid serial clock jitter affecting ENOB. Use Value: ±1.0 LSB INL and ±0.25 LSB channel-to-channel gain matching ensure calibration stability across temperature; REFADJ pin allows fine-tuning to compensate for sensor offset drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, serial, multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200ksps, single-channel, SPI-only, no internal track/hold | Lacks multi-channel mux, differential support, and programmable input modes; suitable only for simple single-signal monitoring | Select only if 8-bit resolution suffices and system design can accommodate external sample-hold and channel switching |
| MAX11131ETE+ | 12-bit, 500ksps, 8-channel, internal 2.048V reference, SPI/QSPI compatible, 16-pin TQFN | Higher speed and channel count; includes internal reference but lacks bipolar input support and REFADJ adjustability | Prefer when higher throughput or more channels are needed and external reference flexibility is not required |
Compared with MAX1247BEEE-T, ADS7822U trades resolution and channel flexibility for lower cost and smaller size, while MAX11131ETE+ offers greater speed and channel density at the expense of bipolar input capability and external reference tunability - making MAX1247BEEE-T optimal for low-power, reference-flexible, dual-mode acquisition in space-constrained portable systems.
Availability
MAX1247BEEE-T is available at Aetrix Electronics and suitable for portable data logging, medical instruments, and battery-powered instruments requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.
Supply support for MAX1247BEEE-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 industrial, medical, and consumer applications.
The MAX1246/MAX1247 family was engineered for low-power, multi-channel data acquisition in portable and battery-operated systems - emphasizing flexible input configuration, minimal supply current, and direct µP interface compatibility.
FAQ
What is the operating temperature range for MAX1247BEEE-T?
The MAX1247BEEE-T is specified for operation from 0°C to +70°C (Commercial grade). This range is confirmed in the Ordering Information table and Electrical Characteristics section of the official datasheet, where parameters like INL (±1.0 LSB), supply current, and reference performance are guaranteed across this interval. The "B" grade suffix in MAX1247BEEE-T denotes this commercial temperature range.
Does MAX1247BEEE-T include an internal voltage reference?
No, MAX1247BEEE-T does not include an internal voltage reference. Unlike the MAX1246 variant, the MAX1247 requires an external reference applied to the VREF pin (1.0V to VDD+50mV). The internal reference buffer is present but must be disabled by tying REFADJ to VDD; the device relies entirely on the externally supplied reference for ADC accuracy.
What are the power-down current specifications for MAX1247BEEE-T?
MAX1247BEEE-T supports two power-down states: full power-down draws ≤1µA, and fast power-down draws ≤54µA at 1ksps (3V supply). These values are measured under defined conditions (TA = TMIN to TMAX, VDD = 2.7V–5.25V) and appear in the Electrical Characteristics table under "Positive Supply Current, MAX1247". Full shutdown disables all circuitry except SHDN input detection.
Can MAX1247BEEE-T perform differential measurements?
Yes, MAX1247BEEE-T supports pseudo-differential measurements using CH0/CH1 or CH2/CH3 pairs. As defined in Tables 2 and 3 of the datasheet, setting SGL/DIF = 0 selects differential mode, where the ADC samples the voltage difference between two inputs while holding the negative input stable. This is not true fully differential input but provides effective common-mode rejection when IN− is properly decoupled to AGND.
What package type is used for MAX1247BEEE-T?
MAX1247BEEE-T uses a 16-pin QSOP (Quarter-Size Outline Package) with 0.635mm lead pitch and 5.3mm × 10.2mm body dimensions. This is explicitly stated in the Ordering Information table and Pin Configuration section, and it occupies the same PCB area as an 8-pin SOIC - enabling compact layout in space-constrained portable designs.
MAX1247BEEE-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):
- 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:
- -
MAX1247BEEE-T FAQ
1.How can I place an order for MAX1247BEEE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1247BEEE-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 MAX1247BEEE-T reliable?
The price and inventory of MAX1247BEEE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1247BEEE-T is usually 5 days.
3.What payment methods are accepted for MAX1247BEEE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1247BEEE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1247BEEE-T?
MAX1247BEEE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1247BEEE-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 MAX1247BEEE-T?
For technical support, including MAX1247BEEE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1247BEEE-T requirements.
6.How does Aetrix verify that MAX1247BEEE-T is sourced from the original manufacturer or authorized distributors?
All MAX1247BEEE-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 MAX1247BEEE-T meets industry standards.
7.What is the process for return or replacement of MAX1247BEEE-T?
All MAX1247BEEE-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1247BEEE-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 MAX1247BEEE-T part is unused and in its original packaging.
Return procedure for MAX1247BEEE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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