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Analog Devices Inc./Maxim Integrated MAX1247BEPE
- Part No.:
- MAX1247BEPE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1247BEPE.pdf
- Description:
- IC ADC 12BIT SAR 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,831
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Product details
Overview
MAX1247BEPE 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 at VREF pin. It is used in portable data logging and battery-powered medical instruments requiring low-power, high-accuracy signal digitization.
For engineers reviewing the MAX1247BEPE datasheet, MAX1247BEPE pinout, MAX1247BEPE application, or MAX1247BEPE 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 OEM and embedded design workflows.
Technical Context
The MAX1247BEPE 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 7.5MHz) and external serial clock (up to 2MHz) conversion modes. Its analog front-end allows software-selectable input configurations: 4 single-ended or 2 pseudo-differential channels referenced to COM.
It features a reference-buffer amplifier with ±1.5% adjustment range at REFADJ, requires external reference voltage (1.0V to VDD+50mV), and provides serial strobe (SSTRB) output for TMS320-family DSP synchronization. Power management includes hardware SHDN pin and software-selectable full/fast power-down modes achieving ≤1µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for precise sensor or instrumentation signal capture |
| Sampling Rate | 133ksps - enables real-time acquisition of audio-band and control-loop signals without undersampling artifacts |
| INL (Max) | ±1 LSB - ensures monotonicity and <0.025% full-scale linearity error across temperature and supply variation |
| Supply Range | +2.7V to +5.25V - supports direct interfacing with 3.3V and 5V microcontrollers and mixed-voltage systems |
| Power Consumption | 1.2mA @ 133ksps, 3V - allows continuous operation in handheld devices with >100-hour battery life using typical 3.7V Li-ion cells |
| Reference Input | External only (1.0V to VDD+50mV) - mandates external precision reference but enables system-level reference sharing and calibration flexibility |
| Interface Protocol | SPI/QSPI/MICROWIRE 4-wire - eliminates need for level shifters or glue logic when connecting to standard MCU serial peripherals |
Pinout & Package
MAX1247BEPE is housed in a 16-pin QSOP package (5.3mm × 10.2mm footprint, same board area as 8-pin SO), optimized for space-constrained portable instrumentation and data loggers.
| 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 | Software-selectable as 4 single-ended or 2 differential pairs (CH0/CH1, CH2/CH3); max input swing = AGND−0.3V to VDD+0.3V |
| COM (Pin 6) | Analog common reference | Sets zero-code point in single-ended mode; must be stable to ±0.5 LSB; connects to system AGND or mid-supply for bipolar operation |
| SHDN (Pin 7) | Three-level shutdown control | Pull low → full shutdown (≤1µA); float → external compensation mode; pull high → internal compensation mode |
| VREF (Pin 8) | Reference input/output | External reference input only (MAX1247); disable internal buffer by tying REFADJ to VDD; accepts 1.0V to VDD+50mV |
| AGND (Pin 10) | Analog ground return | Separate from DGND; must be star-connected to minimize noise coupling into sensitive analog inputs and reference path |
| DGND (Pin 11) | Digital ground return | Return for SCLK, DIN, DOUT, CS, SSTRB; connect to AGND at single point near VDD decoupling capacitor |
| CS (Pin 15) | Active-low chip select | Enables serial interface; DOUT goes high-Z when CS = high; required for multi-device SPI bus sharing |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; defines channel, polarity, mode, and clock source |
| SCLK (Pin 16) | Serial clock input | Drives data transfer and (in external mode) SAR conversion; 40–60% duty cycle required; max 2MHz frequency |
| DOUT (Pin 12) | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge; high-Z when CS = high; compatible with 3.3V/5V logic |
| SSTRB (Pin 13) | Serial strobe output | Signals conversion start/end: pulses high before MSB in external mode; goes low at start, high at completion in internal mode |
| REFADJ (Pin 9) | Reference buffer adjust | Tie to VDD to disable internal reference buffer; otherwise enables ±1.5% VREF fine-tuning via external resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel multiplexer + track/hold | Reduces external component count by integrating signal routing and sampling hold-eliminates need for discrete multiplexer and external sample-and-hold IC |
| Software-configurable input modes | Single control byte selects unipolar/bipolar and single-ended/differential operation-enables runtime reconfiguration without hardware changes |
| Low-power shutdown states | Hardware SHDN pin and software-selectable full/fast power-down reduce current to ≤1µA-extends battery life in intermittent-sampling applications |
| QSOP-16 package | Same PCB footprint as 8-pin SO-allows drop-in upgrade from legacy 8-pin ADCs while adding 4-channel capability and serial interface |
| TMS320-compatible SSTRB | Direct strobe output synchronizes conversion timing with TI C2000 and C5000 DSP families-removes need for GPIO-based polling or timer interrupts |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over 72-hour field deployment. IC Role / Device Role / Timing Role: Primary ADC digitizing four analog sensor outputs sequentially with 12-bit resolution and 133ksps throughput. Use Value: 1.2mA active current and ≤1µA shutdown enable >100-hour operation on two AA alkaline cells; QSOP-16 saves PCB area vs. discrete solutions. | Use Scenario: Handheld ECG monitor acquiring lead I, II, III, and AVR signals with programmable gain and filtering. IC Role / Device Role / Timing Role: Analog front-end ADC providing differential input support, bipolar range (±1.25V), and low-noise conversion for biopotential signals. Use Value: ±1 LSB INL and 73dB SINAD ensure clinical-grade waveform fidelity; software-configurable modes simplify FDA-cleared firmware variants. |
| Pen Digitizers | Battery-Powered Instruments |
Use Scenario: Active stylus interface in tablet PCs measuring X/Y position and pressure via resistive or capacitive sensor arrays. IC Role / Device Role / Timing Role: High-speed 4-channel ADC sampling multiple electrode voltages simultaneously to compute stylus coordinates. Use Value: 1.5µs acquisition time and 2.25MHz small-signal bandwidth resolve fast pen movement transients; SPI interface enables deterministic MCU readout. | Use Scenario: Portable multimeter capturing AC/DC voltage, current, and resistance with auto-ranging and backlit LCD. IC Role / Device Role / Timing Role: Core measurement ADC supporting unipolar (0–2.5V) and bipolar (±1.25V) ranges, with external reference for accuracy traceability. Use Value: External VREF input allows use of ultra-stable 2.5V reference IC (e.g., REF5025) to meet 0.1% measurement accuracy spec across temperature. |
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, 8-pin SOIC package | Lacks differential input support and external reference option; lower power (1.25mW) but no SSTRB output | Select when board space is critical and only single-ended unipolar inputs are needed; not suitable for TMS320 sync or bipolar signal chains |
| MAX11131ETE+ | 12-bit, 500ksps, internal reference, 16-pin TQFN, SPI/QSPI/MICROWIRE, built-in PGA | Higher speed and integrated programmable gain amplifier; no external reference support; different pinout and thermal pad | Choose for higher throughput or variable-gain front-end needs; requires PCB redesign due to TQFN package and pin mapping |
Compared with ADS7822U and MAX11131ETE+, the MAX1247BEPE uniquely balances external reference flexibility, differential input capability, TMS320-compatible strobe signaling, and QSOP-16 footprint compatibility-making it optimal for upgrade paths from legacy 8-pin SO designs in portable medical and industrial data acquisition.
Availability
MAX1247BEPE is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and guaranteed authentic sourcing.
Supply support for MAX1247BEPE 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 communications applications.
The MAX1246/MAX1247 product line delivers low-power, serial-interface 12-bit ADCs targeting portable and battery-operated systems where size, power efficiency, and ease of µP integration are critical design constraints.
FAQ
What is the operating temperature range for MAX1247BEPE?
The MAX1247BEPE is specified for operation from −40°C to +85°C (industrial grade). This range is confirmed in the "Ordering Information" table of the official datasheet, where the "E" suffix denotes the extended temperature grade. The device maintains full DC accuracy (±1 LSB INL) and dynamic performance (73dB SINAD) across this entire range when powered from +2.7V to +5.25V and using a stable external reference.
Does MAX1247BEPE include an internal voltage reference?
No, MAX1247BEPE 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 "MAX1247 requires an external reference" and specifies VREF input voltage range as 1.0V to VDD+50mV. Internal reference functionality is disabled by pulling REFADJ to VDD.
Can MAX1247BEPE perform differential measurements?
Yes, MAX1247BEPE supports pseudo-differential measurements on two channel pairs: CH0/CH1 and CH2/CH3. This is configured via the SGL/DIF bit in the 8-bit control byte (bit 2 = 0). In differential mode, the device samples the voltage difference |IN+ − IN−|, with IN+ and IN− selected from the paired channels. The COM pin serves as the reference for single-ended mode only.
What is the minimum acquisition time for MAX1247BEPE?
The guaranteed maximum acquisition time (tACQ) for MAX1247BEPE is 1.5µs, as specified in the Electrical Characteristics table under "Track/Hold Acquisition Time". This value applies with source impedance ≤1kΩ. For higher source impedances, tACQ increases per the formula tACQ = 9 × (RS + 9kΩ) × 16pF, requiring additional settling time before conversion start.
How does the SHDN pin function on MAX1247BEPE?
The SHDN pin on MAX1247BEPE provides three-level control: pulled low → full power-down (≤1µA supply current); left floating → external compensation mode for reference buffer; pulled high → internal compensation mode. This is distinct from simple on/off shutdown and enables precise reference stability tuning depending on external capacitor selection at REFADJ and VREF pins.
MAX1247BEPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1247BEPE FAQ
1.How can I place an order for MAX1247BEPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1247BEPE 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 MAX1247BEPE reliable?
The price and inventory of MAX1247BEPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1247BEPE is usually 5 days.
3.What payment methods are accepted for MAX1247BEPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1247BEPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1247BEPE?
MAX1247BEPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1247BEPE 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 MAX1247BEPE?
For technical support, including MAX1247BEPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1247BEPE requirements.
6.How does Aetrix verify that MAX1247BEPE is sourced from the original manufacturer or authorized distributors?
All MAX1247BEPE 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 MAX1247BEPE meets industry standards.
7.What is the process for return or replacement of MAX1247BEPE?
All MAX1247BEPE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1247BEPE, 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 MAX1247BEPE part is unused and in its original packaging.
Return procedure for MAX1247BEPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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