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Analog Devices Inc./Maxim Integrated MAX1246BCPE
- Part No.:
- MAX1246BCPE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1246BCPE.pdf
- Description:
- IC ADC 12BIT SAR 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:960
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Product details
Overview
MAX1246BCPE 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 portable medical instruments and battery-powered logging systems.
For engineers reviewing the MAX1246BCPE datasheet, MAX1246BCPE pinout, MAX1246BCPE application, or MAX1246BCPE equivalent, this page delivers verified specifications, validated pin functions, confirmed operating modes (internal clock vs. external clock), real-world power-down behavior (1µA shutdown), and precise analog input configuration logic for design-in confidence.
Technical Context
The MAX1246BCPE uses successive-approximation register (SAR) architecture with an integrated track/hold circuit that acquires signals in ≤1.5µs and supports both internal clock (up to 7.5MHz) and external clock (up to 2MHz) operation. Its analog front-end allows software-selectable channel mapping (CH0–CH3), unipolar (0V to VREF) or bipolar (±VREF/2) ranges, and single-ended or pseudo-differential input modes via control-byte programming.
It features a buffered internal 2.5V reference (±0.5% initial accuracy, ±30ppm/°C TC), reference-adjustment capability via REFADJ pin (±1.5% range), and three-level SHDN control enabling full power-down, fast power-down, or reference-compensation mode selection-all without external components beyond standard bypass capacitors (4.7µF at VREF, 0.047µF at REFADJ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 610µV step size with 2.5V reference, sufficient for 0.024% full-scale precision in sensor digitization. |
| INL (Integral Nonlinearity) | ±1 LSB max - ensures monotonicity and <0.024% end-point error across full code range, critical for closed-loop control feedback. |
| Conversion Rate | 133ksps (external clock) - supports real-time sampling of audio-band and vibration signals up to ~66kHz Nyquist frequency. |
| Supply Current | 1.2mA @ 133ksps / 3V - enables >10-hour runtime on a 12mAh coin cell when paired with duty-cycled operation. |
| Shutdown Current | 1µA - reduces average system power by >99% between conversions, essential for ultra-low-power wake-on-event architectures. |
| Input Voltage Range | 0V to 2.5V (unipolar) or ±1.25V (bipolar) - matches common sensor output spans (e.g., load cells, accelerometers) without signal conditioning. |
| Reference Accuracy | 2.480V–2.520V @ +25°C, ±30ppm/°C - maintains <±0.5LSB drift over 0°C to +70°C, eliminating need for periodic calibration in field-deployed instruments. |
Pinout & Package
MAX1246BCPE is housed in a 16-pin plastic DIP package (0.300" wide), compatible with through-hole prototyping and legacy industrial PCB layouts. Pin assignments are electrically validated per Maxim's official pin description table and functional timing diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog core, reference buffer, and digital interface-must be decoupled with 0.1µF ceramic near pin. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable as single-ended (vs. COM) or differential pairs (CH0/CH1, CH2/CH3); input leakage <±1µA ensures minimal loading on high-Z sources. |
| COM (Pin 6) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5LSB (≈300µV) - requires dedicated low-noise AGND plane connection. |
| SHDN (Pin 7) | Three-level shutdown control | Pull low → full shutdown (1µA); float → external compensation mode; pull high → internal compensation - no external pull-up/down resistors needed. |
| VREF (Pin 8) | Reference output/input | 2.500V nominal output (MAX1246 only); buffered, adjustable via REFADJ; requires 4.7µF tantalum capacitor for stability in internal mode. |
| AGND (Pin 10) | Analog ground return | Separate from DGND to prevent digital noise coupling into ADC sampling node - must tie to system analog ground at single point. |
| DGND (Pin 11) | Digital ground return | Returns digital interface currents (DIN/DOUT/SCLK/CS); connects to system digital ground, isolated from AGND except at star point. |
| CS (Pin 15) | Active-low chip select | Enables serial interface; DOUT enters high-impedance state when CS = high - allows multi-device SPI bus sharing without contention. |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; bit format defines channel, polarity, mode, and clock source - no external level-shifting required for 3V µP interfaces. |
| DOUT (Pin 12) | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge; high-impedance when CS = high - eliminates need for external tri-state buffers. |
| SCLK (Pin 16) | Serial clock input | Drives data transfer and (in external mode) conversion timing; accepts 100kHz–2MHz clock with 40–60% duty cycle - compatible with standard µP SPI peripherals. |
| SSTRB (Pin 13) | Serial strobe output | Signals conversion start/end: goes low at conversion start (internal mode) or pulses high before MSB (external mode) - synchronizes DSP capture without polling. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference with REFADJ | Eliminates external reference IC and trim pot; ±1.5% adjustment range enables precise scaling for custom full-scale ranges (e.g., 0–2.048V). |
| Software-configurable input modes | Single control byte selects unipolar/bipolar and single-ended/differential operation - enables one hardware design to support multiple sensor types without BOM changes. |
| Three-level SHDN pin | Hardware-selectable power states (full shutdown, fast wakeup, reference compensation) reduce firmware complexity and eliminate race conditions during sleep/wake transitions. |
| Track/hold with 1.5µs acquisition time | Supports DC–2.25MHz small-signal bandwidth; allows direct connection to transducer outputs with source impedances ≤1kΩ without external op-amp buffering. |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | Native interface alignment with industry-standard protocols - no glue logic or bit-banging required; works with C2000, STM32, and MSP430 families out-of-box. |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and CO₂ every 10 seconds for 6-month field deployment. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from MEMS sensors; internal reference ensures consistent scaling across temperature; 1µA shutdown extends battery life. Use Value: Eliminates need for external reference and power management IC, reducing BOM count by 2 parts and PCB area by 25mm². | Use Scenario: Handheld ECG monitor acquiring lead-II differential signals at 1ksps with real-time QRS detection. IC Role / Device Role / Timing Role: 12-bit SAR ADC performing pseudo-differential sampling of amplified biopotentials; software-selectable bipolar mode captures negative deflections without level-shifting. Use Value: Achieves 73dB SINAD at 10kHz, meeting AAMI EC11 clinical accuracy requirements while consuming <1.5mW total system power. |
| Pen Digitizers | Battery-Powered Instruments |
Use Scenario: Active stylus digitizer tablet detecting pen tip position and pressure via analog voltage from resistive mesh. IC Role / Device Role / Timing Role: High-speed 4-channel ADC scanning X/Y electrode pairs and pressure sensor; 133ksps rate supports >200Hz stylus update rate with low latency. Use Value: Internal track/hold and 1.5µs acquisition enable accurate position capture even during rapid pen movement, with no external sample-hold circuitry. | Use Scenario: Field-portable multimeter measuring AC/DC voltage, current, and resistance with autoranging and backlit LCD. IC Role / Device Role / Timing Role: Precision ADC digitizing scaled input signals; internal 2.5V reference provides stable full-scale for 4½-digit resolution (±19999 counts). Use Value: ±1 LSB INL and ±0.5 LSB offset error ensure metrology-grade linearity without factory calibration per unit. |
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 and REFADJ circuitry. | Higher speed but adds BOM cost and layout complexity; lacks SHDN-driven power-down automation. | Select when maximum throughput (>133ksps) is mandatory and reference design flexibility outweighs integration benefits. |
| MAX11100ETE+ | 12-bit, 1MSPS, internal reference, SPI/QSPI, 10-pin µMAX package - smaller footprint but no DIP option. | Higher performance and smaller size, but incompatible pinout and thermal profile; not drop-in for legacy DIP designs. | Select for new compact designs prioritizing speed and space savings, where re-layout is acceptable. |
Compared with ADS7822U and MAX11100ETE+, the MAX1246BCPE uniquely combines DIP packaging, integrated reference with adjustment, three-level shutdown, and guaranteed ±1 LSB INL in a single +2.7V to +3.6V supply - making it optimal for cost-sensitive, space-constrained, and field-replaceable instrumentation where design reuse and long-term component availability matter.
Availability
MAX1246BCPE is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply and long-lifecycle support.
Supply support for MAX1246BCPE 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 family was designed for low-power, high-accuracy data acquisition in resource-constrained environments-emphasizing integrated references, flexible input configurations, and robust serial interfacing to simplify sensor-to-processor signal chains.
FAQ
What is the operating temperature range for MAX1246BCPE?
The MAX1246BCPE is specified for 0°C to +70°C operation, as indicated by the "B" grade suffix in its ordering code. This commercial-grade temperature range is validated across all electrical parameters including INL (±1 LSB), reference voltage (2.480V–2.520V), and supply current (1.2mA typical at 133ksps). The device meets these specs without derating and is suitable for indoor instrumentation and handheld devices not exposed to extreme ambient conditions. MAX1246BCPE does not support extended or military temperature grades.
Does MAX1246BCPE require external components for basic operation?
Yes, MAX1246BCPE requires two mandatory external components: a 4.7µF capacitor at the VREF pin (for internal reference stability) and a 0.047µF capacitor at the REFADJ pin (for reference buffer compensation). Additionally, a 0.1µF ceramic capacitor is required on VDD close to the package. These values are specified in the datasheet's Typical Operating Circuit and Absolute Maximum Ratings section. Omitting the VREF capacitor causes reference instability and increased INL; omitting the REFADJ capacitor degrades reference accuracy over temperature.
How does the SHDN pin function on MAX1246BCPE?
The SHDN pin on MAX1246BCPE provides three distinct operational states: pulling SHDN low enables full power-down (1µA supply current); letting SHDN float configures the reference-buffer amplifier for external compensation (requires 4.7µF at VREF); pulling SHDN high selects internal compensation mode. This three-level control is implemented entirely within the IC-no external logic or voltage dividers are needed. The MAX1246BCPE automatically powers up when the serial interface is accessed (CS low), and the quick turn-on time (<1µs) allows reliable use in burst-mode acquisition systems.
Can MAX1246BCPE interface directly with a TMS320C2000 DSP?
Yes, MAX1246BCPE can interface directly with TMS320C2000-series DSPs using its SSTRB output. The datasheet explicitly states that SSTRB allows "direct connection to TMS320-family digital signal processors." In external clock mode, SSTRB pulses high for one clock period before the MSB decision, providing a hardware-ready signal to trigger DMA capture. No level shifters or timing adapters are required-the MAX1246BCPE's 3V-compatible logic levels and SPI/QSPI protocol alignment ensure seamless integration with C2000 McBSP or SPI peripherals.
What is the maximum source impedance supported for analog inputs on MAX1246BCPE?
The MAX1246BCPE supports analog source impedances up to 1kΩ without degrading AC performance (SINAD, THD). For higher impedances, the acquisition time lengthens per tACQ = 9 × (RS + 9kΩ) × 16pF, with a minimum of 1.5µs. To maintain accuracy with RS > 1kΩ, a 0.01µF capacitor must be placed at each analog input to form an RC filter-though this limits input bandwidth. The datasheet warns that source impedances above 1kΩ do not significantly affect AC specs only when the 0.01µF cap is used; otherwise, distortion increases and effective resolution drops. MAX1246BCPE's input capacitance is 16pF, and leakage is ±1µA max.
MAX1246BCPE 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, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1246BCPE FAQ
1.How can I place an order for MAX1246BCPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1246BCPE 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 MAX1246BCPE reliable?
The price and inventory of MAX1246BCPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1246BCPE is usually 5 days.
3.What payment methods are accepted for MAX1246BCPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1246BCPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1246BCPE?
MAX1246BCPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1246BCPE 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 MAX1246BCPE?
For technical support, including MAX1246BCPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1246BCPE requirements.
6.How does Aetrix verify that MAX1246BCPE is sourced from the original manufacturer or authorized distributors?
All MAX1246BCPE 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 MAX1246BCPE meets industry standards.
7.What is the process for return or replacement of MAX1246BCPE?
All MAX1246BCPE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1246BCPE, 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 MAX1246BCPE part is unused and in its original packaging.
Return procedure for MAX1246BCPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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