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Analog Devices Inc./Maxim Integrated MAX1246BEEE-T
- Part No.:
- MAX1246BEEE-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1246BEEE-T.pdf
- Description:
- IC ADC 12BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,283
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Product details
Overview
MAX1246BEEE-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, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.7V to +3.6V supply, achieves 133ksps conversion rate, and draws only 1.2mA at full speed-enabling high-precision data acquisition in battery-powered medical instruments and portable data loggers.
For engineers reviewing the MAX1246BEEE-T datasheet, MAX1246BEEE-T pinout, MAX1246BEEE-T application, or MAX1246BEEE-T equivalent, key selection criteria include its QSOP-16 package, ±1 LSB INL (B-grade), internal reference accuracy (±0.5% over temperature), shutdown current <1µA, and compatibility with TMS320-family DSPs via SSTRB strobe output.
Technical Context
The MAX1246BEEE-T employs a successive-approximation register (SAR) architecture with a capacitive DAC and integrated track/hold circuitry. Its analog front-end supports pseudo-differential sampling with channel-to-channel offset matching of ±0.25 LSB and small-signal bandwidth of 2.25MHz.
It uses either an internal clock (7.5MHz typical) or external serial clock (up to 2MHz) for conversion control. The 8-bit control byte configures channel selection, input polarity, single-ended/differential mode, and power-down state-enabling flexible system-level timing and low-power sequencing without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 610µV step size with 2.5V reference for precise sensor digitization |
| INL (B-grade) | ±1 LSB - ensures monotonicity and ≤0.024% full-scale error across operating temperature range |
| Conversion Rate | 133ksps - enables real-time sampling of audio-band and control-loop signals |
| Supply Current | 1.2mA @ 133ksps / 3V - allows continuous operation in energy-constrained portable systems |
| Shutdown Current | 1µA - reduces average power by >99% between conversions for ultra-low-duty-cycle sensing |
| Reference | Internal 2.5V ±0.5% - eliminates need for external precision reference and associated layout complexity |
| Input Configuration | 4-channel SE or 2-channel diff - supports flexible signal routing without external multiplexers |
Pinout & Package
MAX1246BEEE-T is housed in a 16-pin QSOP package (5.3mm × 10.2mm), occupying the same PCB footprint as an 8-pin SOIC-enabling compact, space-optimized designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog and digital sections-requires local 0.1µF bypass to AGND |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable single-ended or differential inputs; each has ±0.01µA leakage and 16pF input capacitance |
| 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 for full power-down; float for external REFADJ compensation; pull high for internal compensation |
| VREF (Pin 8) | Reference buffer output | Delivers 2.500V ±0.5% (typ); requires 4.7µF capacitor for stability in internal reference mode |
| REFADJ (Pin 9) | Reference trim input | Adjusts VREF ±1.5%; tie to VDD to disable internal reference buffer when using external reference |
| AGND (Pin 10) | Analog ground | Must be separated from DGND and connected at single point to minimize noise coupling into ADC core |
| DGND (Pin 11) | Digital ground | Return path for digital I/O; isolation from AGND prevents digital switching noise from degrading SNR |
| DOUT (Pin 12) | Serial data output | MSB-first, 12-bit result clocked on SCLK falling edge; high-impedance when CS = high |
| SSTRB (Pin 13) | Serial strobe output | Signals conversion start/end; directly interfaces with TMS320-family DSPs for synchronous data capture |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; defines channel, polarity, and clock mode |
| CS (Pin 15) | Chip select | Active-low enable; controls DOUT three-state behavior and initiates control-byte latching |
| 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 |
|---|---|
| Single-supply operation | +2.7V to +3.6V - eliminates dual-rail supplies and simplifies power architecture in portable systems |
| Internal 2.5V reference | ±0.5% initial accuracy, ±30ppm/°C TC - removes external reference IC, saves BOM cost and board area |
| Software-configurable inputs | Unipolar/bipolar and single-ended/differential via control byte - enables one hardware design to support multiple sensor types |
| Low-power shutdown | 1µA shutdown current with automatic wake-on-CS - extends battery life in intermittent-sampling applications |
| SPI/QSPI/MICROWIRE compatibility | No external level shifters or glue logic required - accelerates firmware integration with common microcontrollers |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over days. IC Role / Device Role / Timing Role: Primary ADC acquiring multi-channel analog sensor outputs with configurable gain and polarity. Use Value: 1.2mA active current and 1µA shutdown enable >1-year battery life; internal reference ensures consistent calibration across units. | Use Scenario: Handheld ECG monitor capturing biopotential signals with high common-mode rejection. IC Role / Device Role / Timing Role: Front-end ADC performing pseudo-differential sampling of electrode pairs with programmable bipolar range. Use Value: ±1 LSB INL and 73dB SINAD preserve diagnostic signal fidelity; QSOP-16 footprint fits tight handheld enclosures. |
| Pen Digitizers | Battery-Powered Instruments |
Use Scenario: Active stylus digitizer tablet measuring X/Y position via analog voltage gradients on resistive overlay. IC Role / Device Role / Timing Role: High-speed 4-channel ADC scanning electrode grid with 133ksps throughput per channel. Use Value: 2.25MHz small-signal bandwidth captures rapid pen movement transients; SSTRB output synchronizes with host processor DMA. | Use Scenario: Field-deployable multimeter digitizing AC/DC voltage, current, and resistance with autoranging. IC Role / Device Role / Timing Role: Core measurement ADC supporting both unipolar (voltage) and bipolar (current shunt) input modes. Use Value: Software-selectable configuration eliminates hardware jumpers; internal reference ensures stable accuracy across battery discharge curve. |
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, no internal reference, requires external 2.5V ref | Lacks bipolar input support and SSTRB strobe; better suited for high-speed unipolar-only systems | Select if higher throughput is critical and external reference is already present in design |
| MAX11100ETE+ | 12-bit, 1MSPS, internal reference, SPI/QSPI, 10-pin µMAX package | Higher speed but only 1 channel; lacks multiplexer and COM pin for multi-input flexibility | Select for single-channel high-speed applications where board space is more constrained than channel count |
Compared with ADS7822U and MAX11100ETE+, the MAX1246BEEE-T uniquely combines 4-channel MUX, internal reference, bipolar capability, and DSP-synchronized SSTRB in a single QSOP-16 package-making it optimal for compact, multi-sensor, battery-operated systems requiring configurability and low standby power.
Availability
MAX1246BEEE-T 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 traceable sourcing.
Supply support for MAX1246BEEE-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX1246/MAX1247 product line was designed for low-power, multi-channel data acquisition in space- and energy-constrained systems-emphasizing integrated functionality, minimal external components, and robust serial interfacing.
FAQ
What is the operating temperature range for the MAX1246BEEE-T?
The MAX1246BEEE-T is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range aligns with its QSOP-16 packaging and is validated across all electrical parameters including INL, gain error, and reference stability-ensuring reliable performance in indoor portable and benchtop instrumentation environments where thermal extremes are not encountered.
Does the MAX1246BEEE-T require an external reference voltage?
No, the MAX1246BEEE-T includes an internal 2.5V reference buffer with ±0.5% initial accuracy and ±30ppm/°C temperature coefficient. External reference is only required for the MAX1247 variant; the MAX1246BEEE-T is fully functional with its internal reference enabled by default-eliminating the need for external precision references or associated decoupling components.
How does the SHDN pin function on the MAX1246BEEE-T?
The SHDN pin on the MAX1246BEEE-T provides three distinct operating states: pulled low for full power-down (<1µA), floated for external REFADJ compensation mode (4.7µF at VREF), or pulled high for internal compensation mode. This three-level control enables fine-grained power management and reference configuration without additional control logic-directly supporting low-duty-cycle sensing architectures.
Can the MAX1246BEEE-T interface directly with a TMS320 DSP?
Yes, the MAX1246BEEE-T features a dedicated SSTRB (serial strobe) output that pulses synchronously with conversion start and completion. This signal is explicitly designed for direct connection to TMS320-family DSPs, enabling hardware-triggered DMA transfers and eliminating software polling overhead-critical for deterministic real-time signal processing in motor control or audio applications.
What is the maximum source impedance supported for accurate acquisition on the MAX1246BEEE-T?
The MAX1246BEEE-T specifies a minimum acquisition time (tACQ) of 1.5µs, calculated as tACQ = 9 × (RS + 9kΩ) × 16pF. For accurate results, source impedance (RS) should be ≤1kΩ; higher impedances degrade settling and increase acquisition time. If RS exceeds 1kΩ, a 0.01µF capacitor must be placed at each analog input to form an RC filter-though this limits usable signal bandwidth accordingly.
MAX1246BEEE-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, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1246BEEE-T FAQ
1.How can I place an order for MAX1246BEEE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1246BEEE-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 MAX1246BEEE-T reliable?
The price and inventory of MAX1246BEEE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1246BEEE-T is usually 5 days.
3.What payment methods are accepted for MAX1246BEEE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1246BEEE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1246BEEE-T?
MAX1246BEEE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1246BEEE-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 MAX1246BEEE-T?
For technical support, including MAX1246BEEE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1246BEEE-T requirements.
6.How does Aetrix verify that MAX1246BEEE-T is sourced from the original manufacturer or authorized distributors?
All MAX1246BEEE-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 MAX1246BEEE-T meets industry standards.
7.What is the process for return or replacement of MAX1246BEEE-T?
All MAX1246BEEE-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1246BEEE-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 MAX1246BEEE-T part is unused and in its original packaging.
Return procedure for MAX1246BEEE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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