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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 SERIAL 16-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,799
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Product details
Overview
MAX1247BEPE+ from Maxim Integrated is a 12-bit, 4-channel serial analog-to-digital converter (ADC) with software-configurable unipolar/bipolar and single-ended/differential inputs, operating from a single +2.7V to +5.25V supply. It integrates a track/hold circuit, 4-wire SPI/QSPI/MICROWIRE-compatible interface, and supports up to 133ksps conversion rate with 1.2mA supply current at 3V. It is used in portable data loggers 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, key selection considerations include its external reference requirement, QSOP-16 package, 12-bit resolution with ±1 LSB INL, shutdown current of 1µA, and compatibility with TMS320-family DSPs via SSTRB strobe output.
Technical Context
The MAX1247BEPE+ employs successive-approximation register (SAR) architecture with an integrated track/hold circuit enabling accurate sampling of transient or periodic signals up to 2.25MHz small-signal bandwidth. Its analog input multiplexer supports four single-ended or two differential channel pairs, with configurable COM reference and ±0.5LSB COM stability requirement.
It operates in either internal clock mode (35–65kHz typical conversion clock) or external clock mode (up to 2MHz), with conversion timing fully synchronized to SCLK edges. The serial interface uses MSB-first, falling-edge DOUT timing and supports automatic power-up on CS assertion, enabling rapid wake-up between conversions for ultra-low average current operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for precise analog signal representation |
| INL (Integral Nonlinearity) | ±1 LSB - ensures monotonicity and ≤0.024% full-scale error across temperature and supply range |
| Conversion Rate | 133ksps (external clock) - enables real-time sampling of audio-band and control-loop signals |
| Supply Current | 1.2mA at 133ksps / 3V - balances speed and battery life in portable instrumentation |
| Power-Down Current | 1µA - reduces system standby power by >1000× versus active mode |
| Input Voltage Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - supports both ground-referenced and centered signal acquisition |
| Reference Requirement | External reference required - mandates stable 1.0V to (VDD + 50mV) source at VREF pin for accuracy |
Pinout & Package
MAX1247BEPE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm), occupying the same PCB footprint as an 8-pin SOIC. Pin functions are validated per Maxim's official pin description and block diagram (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; requires local 0.1µF bypass |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable as single-ended (vs. COM) or differential (CH0/CH1, CH2/CH3); max input swing = AGND −0.3V to VDD +0.3V |
| COM (Pin 6) | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5LSB during conversion |
| SHDN (Pin 7) | Three-level shutdown control | Low = full shutdown (1µA); float = external reference compensation; high = internal compensation mode |
| VREF (Pin 8) | Reference input/output | Input for external reference (buffer disabled); no internal reference - unlike MAX1246 |
| REFADJ (Pin 9) | Reference buffer adjustment | Tie to VDD to disable internal buffer; otherwise enables ±1.5% VREF fine-tuning |
| AGND (Pin 10) | Analog ground | Separate return path for analog circuitry; must be star-connected to minimize noise coupling |
| DGND (Pin 11) | Digital ground | Return for digital I/O; isolated from AGND except at single-point system ground |
| DOUT (Pin 12) | Serial data output | MSB-first, clocked on SCLK falling edge; high-impedance when CS = high |
| SSTRB (Pin 13) | Serial strobe output | Pulses high before MSB decision (external clock) or indicates conversion start/end (internal clock); direct TMS320 sync |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; defines channel, mode, and clock/power-down settings |
| CS (Pin 15) | Chip select | Active-low enable for serial interface; disables DOUT/SSTRB when high |
| SCLK (Pin 16) | Serial clock input | Drives data transfer and (in external mode) conversion timing; 40–60% duty cycle required |
Key Features
| Feature | Design Value |
|---|---|
| 4-wire SPI/QSPI/MICROWIRE interface | Eliminates level-shifting or glue logic when interfacing with common microcontrollers and DSPs |
| Software-configurable input modes | Single control byte selects unipolar/bipolar and single-ended/differential operation without hardware change |
| Track/hold acquisition time | 1.5µs minimum - enables accurate sampling of fast-rising signals with source impedances ≤1kΩ |
| Channel-to-channel offset matching | ±0.25 LSB - ensures consistent baseline across all four inputs for multi-sensor systems |
| Aperture jitter | <50ps - preserves SNR in undersampling applications up to 10kHz input frequency |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-operated environmental sensor node recording temperature, humidity, and pressure over days. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog outputs from multiple sensors using single-ended mode and shared COM reference. Use Value: 1µA shutdown current extends battery life; 12-bit resolution captures subtle drift; QSOP-16 minimizes board area. | Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with motion artifact rejection. IC Role / Device Role / Timing Role: Configured in differential mode (CH0/CH1) to reject common-mode noise; COM tied to mid-supply reference. Use Value: ±1 LSB INL ensures diagnostic-grade linearity; 2.25MHz input bandwidth supports R-wave detection fidelity. |
| Pen Digitizers | Battery-Powered Instruments |
Use Scenario: Active stylus tablet measuring X/Y electrode capacitance changes via successive channel scanning. IC Role / Device Role / Timing Role: Rapid 4-channel polling (CH0–CH3) in unipolar mode, synchronized to touch-event interrupt. Use Value: 133ksps rate enables sub-millisecond coordinate update; low 1.2mA active current prevents stylus thermal buildup. | Use Scenario: Field-deployable pH/mV meter with LCD display and USB data export. IC Role / Device Role / Timing Role: Digitizes analog front-end output in bipolar mode (±2.5V range) with external precision reference. Use Value: External reference support allows traceable calibration; 12-bit resolution resolves 0.001pH steps with Nernst equation scaling. |
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; 2.7–5.25V supply; SO-8 package | Lacks differential input capability and SSTRB strobe; no REFADJ or three-level SHDN | Select when board space is constrained and only single-ended unipolar acquisition is needed |
| MAX11131ETE+ | 12-bit, 500ksps, internal reference, SPI/QSPI compatible; 10-pin µMAX package; 1.8–3.6V supply only | Higher speed but narrower supply range; no external reference option; no COM pin for flexible referencing | Select for higher throughput in low-voltage (1.8–3.6V) systems where external reference is unnecessary |
Compared with ADS7822U and MAX11131ETE+, the MAX1247BEPE+ uniquely supports differential inputs, external reference flexibility, and TMS320-compatible strobe signaling-making it optimal for multi-sensor, battery-powered, and DSP-coupled measurement systems requiring configurability and precision.
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 demanding industrial, medical, and communications applications.
The MAX1246/MAX1247 product line delivers low-power, serial-interface 12-bit ADCs optimized for portable and battery-constrained systems where software-configurable input ranges and minimal standby current are critical design requirements.
FAQ
What is the reference configuration requirement for MAX1247BEPE+?
The MAX1247BEPE+ 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 internal reference buffer must be disabled by tying REFADJ to VDD. Reference input impedance is 18–25kΩ, and input current is 100–150µA at 2.5V.
Does MAX1247BEPE+ support differential input mode?
Yes, the MAX1247BEPE+ supports pseudo-differential input mode via software configuration. Setting SGL/DIF = 0 in the control byte selects differential operation across CH0/CH1 or CH2/CH3 pairs. The negative input (IN−) must remain stable within ±0.5LSB relative to AGND during conversion, typically achieved with a 0.1µF capacitor to AGND.
What is the maximum sampling rate achievable with MAX1247BEPE+?
The MAX1247BEPE+ achieves up to 133ksps when using a 2.0MHz external serial clock in external clock mode. Conversion time is fixed at 6µs (12 clock cycles). In internal clock mode, the maximum effective rate is ~65ksps due to slower internal oscillator frequency (up to 0.225MHz).
How does the SHDN pin function on MAX1247BEPE+?
The SHDN pin on MAX1247BEPE+ provides three distinct states: pulled low → full power-down (1µA); left floating → external reference compensation mode; pulled high → internal reference compensation mode. Since MAX1247BEPE+ lacks an internal reference, "internal compensation" applies only to the REFADJ-adjustable buffer when enabled.
Is MAX1247BEPE+ compatible with standard SPI microcontrollers?
Yes, the MAX1247BEPE+ is fully compatible with standard SPI interfaces when configured with CPOL = 0 and CPHA = 0. It uses MSB-first, falling-edge DOUT timing and accepts an 8-bit control byte on DIN. The SSTRB output provides optional synchronization with TMS320-family DSPs, but is not required for basic SPI operation.
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:
- 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:
- -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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