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Analog Devices Inc./Maxim Integrated MAX1247BCEE+T
- Part No.:
- MAX1247BCEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1247BCEE+T.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,168
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Product details
Overview
MAX1247BCEE+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, 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 MAX1247BCEE+T datasheet, MAX1247BCEE+T pinout, MAX1247BCEE+T application, or MAX1247BCEE+T equivalent, key selection considerations include its 12-bit resolution, ±1 LSB INL (B-grade), QSOP-16 package, external reference requirement, and compatibility with TMS320-family DSPs via SSTRB strobe output.
Technical Context
The MAX1247BCEE+T employs successive-approximation register (SAR) architecture with an internal track/hold circuit enabling acquisition in 1.5µs. It supports both external clock mode (up to 2MHz) and internal clock mode (35–65kHz), with conversion time as low as 6µs using external clocking. Its analog front-end allows pseudo-differential sampling across CH0–CH3 with COM as common reference.
Input configuration is fully software-defined via an 8-bit control byte specifying channel, unipolar/bipolar mode, single-ended/differential mode, and power-down/clock mode. The device features a reference-buffer amplifier with ±1.5% REFADJ adjustment range and requires external VREF (1.0V to VDD+50mV), unlike the MAX1246 which includes an internal 2.5V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for precise analog signal representation |
| INL (B-grade) | ±1 LSB - ensures monotonicity and ≤0.024% full-scale linearity error over temperature |
| Sampling Rate | 133ksps - supports real-time capture of signals up to ~66.5kHz (Nyquist-limited) |
| Supply Range | +2.7V to +5.25V - enables direct interfacing with 3.3V and 5V logic/system rails |
| Power Consumption | 1.2mA at 133ksps / 54µA at 1ksps - enables extended battery life in portable instrumentation |
| Reference Input | External VREF (1.0V to VDD+50mV) - allows system-level reference sourcing and improved noise immunity |
| Interface Protocol | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire serial - eliminates need for level-shifting or glue logic |
Pinout & Package
MAX1247BCEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm), occupying the same PCB footprint as an 8-pin SO, enabling compact layout in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; decoupling required near pin |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable as single-ended (vs. COM) or differential pairs (CH0/CH1, CH2/CH3) |
| COM (Pin 6) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB |
| SHDN (Pin 7) | Three-level shutdown control | Low = full shutdown (1µA); float = external REFADJ compensation; high = internal compensation |
| AGND (Pin 10) | Analog ground return | Separate from DGND to minimize digital noise coupling into analog path |
| DGND (Pin 11) | Digital ground return | Return path for serial interface and logic; must connect to AGND at single point |
| VREF (Pin 8) | Reference input/output | Accepts external reference (1.0V–VDD+50mV); buffer disabled when REFADJ = VDD |
| SCLK (Pin 16) | Serial clock input | Drives data I/O and (in external mode) SAR conversion; 40–60% duty cycle required |
| CS (Pin 15) | Chip select (active-low) | Enables serial interface; DOUT and SSTRB go high-Z when CS = high |
| DIN (Pin 14) | Serial data input | Receives 8-bit control byte on SCLK rising edge; defines channel, mode, and clock configuration |
| 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 | Signals conversion start/end; directly interfaces with TMS320-family DSPs for synchronous sampling |
| REFADJ (Pin 9) | Reference buffer adjust | Connect to VDD to disable internal buffer; otherwise enables ±1.5% VREF fine-tuning |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Single-ended or differential, unipolar or bipolar - eliminates hardware reconfiguration for multi-sensor systems |
| Low-power operation with dynamic shutdown | 1µA shutdown current and automatic power-down after conversion - extends battery life without firmware overhead |
| TMS320-family DSP interface support | Dedicated SSTRB output synchronized to conversion timing - enables deterministic sampling in real-time control loops |
| QSOP-16 footprint compatibility | Same board area as 8-pin SO - simplifies layout reuse and reduces PCB layer count in compact designs |
| High-accuracy analog front-end | ±1 LSB INL (B-grade), 73dB SINAD at 10kHz - meets requirements for precision medical and industrial sensing |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes recording temperature, humidity, and pressure over days or weeks. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple analog sensor outputs with minimal power draw between samples. Use Value: 54µA at 1ksps and automatic shutdown reduce average current, extending coin-cell life beyond 12 months. | Use Scenario: Handheld ECG or pulse oximeter capturing biopotential signals with clinical-grade accuracy. IC Role / Device Role / Timing Role: Signal-chain ADC providing 12-bit resolution and <50ps aperture jitter for clean waveform reconstruction. Use Value: ±1 LSB INL and 73dB SINAD ensure diagnostic fidelity; QSOP-16 enables miniaturized probe design. |
| Pen Digitizers | Battery-Powered Instruments |
Use Scenario: Active stylus subsystem in tablet PCs measuring tip position and pressure via resistive or capacitive sensing arrays. IC Role / Device Role / Timing Role: High-speed multiplexed ADC acquiring X/Y coordinate and force data from segmented electrodes. Use Value: 133ksps sampling and 1.5µs acquisition time support >100Hz stylus reporting rates with sub-millisecond latency. | Use Scenario: Field-deployable multimeter or insulation tester requiring isolated analog inputs and long operational runtime. IC Role / Device Role / Timing Role: Core ADC handling autoranging, offset calibration, and dual-supply (±5V) input conditioning. Use Value: External reference support allows use of precision 2.5V or 4.096V references; ±1.5% REFADJ enables factory trimming. |
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 support and SSTRB strobe; no REFADJ adjustment | Select when board space is critical and only single-ended unipolar inputs are needed |
| MAX11131AUT+T | 12-bit, 500ksps, internal reference, 2.7–3.6V supply, µDFN-10 package, built-in PGA | Higher speed but narrower supply range; no external reference option or SSTRB output | Select when higher throughput and programmable gain are required, and 5V operation is not needed |
Compared with ADS7822U and MAX11131AUT+T, MAX1247BCEE+T uniquely combines external reference flexibility, TMS320-compatible strobe output, and software-selectable differential/unipolar modes in a pin-compatible QSOP-16 footprint-making it optimal for upgrade paths from legacy Maxim ADCs and DSP-coupled embedded systems.
Availability
MAX1247BCEE+T is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply and long-term manufacturability.
Supply support for MAX1247BCEE+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 demanding industrial, medical, and communications applications.
The MAX1246/MAX1247 family targets low-power, high-accuracy data acquisition in space- and energy-constrained systems, emphasizing flexible input configuration, serial interface simplicity, and robust reference handling.
FAQ
What is the reference voltage requirement for MAX1247BCEE+T?
The MAX1247BCEE+T requires an external reference voltage applied to the VREF pin, ranging from 1.0V to VDD+50mV. Unlike the MAX1246, it does not include an internal reference. The reference-buffer amplifier is disabled by tying REFADJ to VDD, and the device achieves ±1 LSB INL using a stable 2.5V external reference. This design allows system-level reference selection for optimal noise performance and accuracy traceability.
Does MAX1247BCEE+T support differential input mode?
Yes, MAX1247BCEE+T supports pseudo-differential input mode via software configuration. In differential mode (SGL/DIF = 0), it samples the voltage difference between CH0/CH1 or CH2/CH3 pairs. The negative input (IN−) must remain stable within ±0.5 LSB relative to AGND during conversion, typically achieved using a 0.1µF capacitor to AGND. This capability enables noise-rejecting measurements in industrial sensor interfaces without external instrumentation amplifiers.
What is the meaning of the 'B' grade in MAX1247BCEE+T?
The 'B' in MAX1247BCEE+T denotes the device's accuracy grade: ±1 LSB integral nonlinearity (INL) over the 0°C to +70°C operating range. This is tighter than the 'C' grade (±2 LSB) and looser than the 'A' grade (±0.5 LSB). The B-grade offers optimal balance of precision and cost for portable medical devices and industrial data loggers where clinical or metrology-grade accuracy is not mandated but repeatability and monotonicity are essential.
How does the SHDN pin function on MAX1247BCEE+T?
The SHDN pin on MAX1247BCEE+T provides three distinct operating states: pulled low → full shutdown (1µA quiescent current); pulled high → internal compensation mode for REFADJ; left floating → external compensation mode (requires 4.7µF capacitor at VREF). This three-level control enables flexible power management strategies - for example, floating SHDN during active conversion while pulsing low between acquisitions to minimize average supply current in battery-powered applications.
Can MAX1247BCEE+T interface directly with a TMS320 DSP?
Yes, MAX1247BCEE+T interfaces directly with TMS320-family digital signal processors using its dedicated SSTRB (serial strobe) output. In internal clock mode, SSTRB asserts low at conversion start and high at completion; in external clock mode, it pulses high for one SCLK period before the MSB decision. This hardware-synchronized strobe eliminates software polling and enables deterministic, low-latency sampling in real-time control and audio processing applications without additional timing logic.
MAX1247BCEE+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:
- 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:
- -
MAX1247BCEE+T FAQ
1.How can I place an order for MAX1247BCEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1247BCEE+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 MAX1247BCEE+T reliable?
The price and inventory of MAX1247BCEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1247BCEE+T is usually 5 days.
3.What payment methods are accepted for MAX1247BCEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1247BCEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1247BCEE+T?
MAX1247BCEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1247BCEE+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 MAX1247BCEE+T?
For technical support, including MAX1247BCEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1247BCEE+T requirements.
6.How does Aetrix verify that MAX1247BCEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1247BCEE+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 MAX1247BCEE+T meets industry standards.
7.What is the process for return or replacement of MAX1247BCEE+T?
All MAX1247BCEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1247BCEE+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 MAX1247BCEE+T part is unused and in its original packaging.
Return procedure for MAX1247BCEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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