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Analog Devices Inc./Maxim Integrated MAX1246ACPE
- Part No.:
- MAX1246ACPE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1246ACPE.pdf
- Description:
- IC ADC 12BIT SAR 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:891
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Product details
Overview
MAX1246ACPE from Maxim Integrated is a 12-bit, 4-channel serial analog-to-digital converter (ADC) with integrated track/hold, multiplexer, and internal 2.5V reference. It operates from a single +2.7V to +3.6V supply, supports software-configurable unipolar/bipolar and single-ended/differential inputs, and achieves 133ksps conversion rate using internal or external clocking. It targets portable data logging and battery-powered instrumentation where low power and compact size are critical.
For engineers reviewing the MAX1246ACPE datasheet, MAX1246ACPE pinout, MAX1246ACPE application, or MAX1246ACPE equivalent, key selection criteria include its 1.2mA active current at 133ksps, ±0.5 LSB INL (A-grade), QSOP-16 package compatibility, and SPI/QSPI/MICROWIRE interface without external logic.
Technical Context
The MAX1246ACPE uses successive-approximation register (SAR) architecture with an integrated track/hold circuit that acquires input signals in ≤1.5µs. Its analog front-end supports pseudo-differential sampling via CH0–CH3 and COM, with configurable input ranges of 0V to VREF (unipolar) or ±VREF/2 (bipolar).
It implements a 4-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols (CPOL=0, CPHA=0), and provides a serial strobe output (SSTRB) for synchronization with TMS320-family DSPs. Conversion timing is determined by either the internal oscillator (7.5MHz typ.) or an external SCLK up to 2MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for high-fidelity signal digitization |
| INL (A-grade) | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error after calibration |
| Sampling Rate | 133ksps - enables real-time capture of signals up to ~66kHz under Nyquist criterion |
| Supply Current | 1.2mA @ 133ksps, 3V - allows >800hr operation on a 1000mAh Li-ion cell at full throughput |
| Reference | Internal 2.5V ±0.8% (25°C), ±30ppm/°C TC - eliminates need for external precision reference in cost-sensitive designs |
| Input Configuration | 4-channel SE or 2-channel diff - supports flexible sensor interfacing without external mux or gain stages |
| Interface | SPI/QSPI/MICROWIRE-compatible 4-wire serial - connects directly to MCU peripherals without level shifters or glue logic |
| Power-Down Current | 1µA - reduces system standby power to sub-microwatt levels between measurements |
Pinout & Package
The MAX1246ACPE is housed in a 16-pin plastic DIP (Dual In-line Package) with 0.300" wide body, through-hole mounting, and industry-standard pin spacing (0.1" pitch). This package supports manual prototyping, socket-based testing, and legacy PCB layouts requiring axial lead components.
| 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 as single-ended inputs referenced to COM; support up to 4 independent sensors |
| COM (Pin 6) | Common-mode reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB for accuracy |
| SHDN (Pin 7) | Three-level shutdown control | Pull low → full power-down; float → external REFADJ compensation; pull high → internal compensation |
| AGND (Pin 10) | Analog ground return | Separate from DGND; must connect to quiet ground plane near VREF and analog inputs |
| DGND (Pin 11) | Digital ground return | Return path for SCLK, DIN, DOUT, CS, SSTRB; ties to system digital ground with short trace |
| VREF (Pin 8) | Reference buffer output | Delivers 2.500V ±0.8% (25°C); requires 4.7µF capacitor to AGND for stability in MAX1246 variants |
| SCLK (Pin 16) | Serial clock input | Drives data transfer and (in external mode) SAR conversion; 50% duty cycle required; max 2MHz |
| CS (Pin 15) | Chip select (active-low) | Enables serial interface; DOUT goes high-Z when CS = high; defines start of control byte |
| DIN (Pin 14) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; bit 7 (START) initiates configuration sequence |
| 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: low during conversion (internal mode), one-cycle pulse before MSB (external mode) |
| REFADJ (Pin 9) | Reference buffer adjustment | Allows ±1.5% VREF tuning; tie to VDD to disable internal reference buffer (not used in MAX1246) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5V reference | Eliminates external reference IC and associated layout complexity while maintaining ±0.8% initial accuracy |
| Configurable input modes | Single-ended (4-ch) or differential (2-ch) with software-selectable unipolar/bipolar range via 8-bit control byte |
| Low-power shutdown | Reduces supply current to 1µA in full power-down mode, enabling µA-level system sleep states |
| QSOP-16 footprint compatibility | Shares same board area as 8-pin SOIC, allowing space-constrained upgrades from smaller ADCs |
| T/H acquisition time | ≤1.5µs ensures accurate sampling of fast transients without external sample-hold circuitry |
| SPI/QSPI/MICROWIRE native interface | Direct connection to microcontroller peripherals without protocol translation or external logic gates |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over weeks. IC Role / Device Role / Timing Role: Primary ADC acquiring 4 analog sensor outputs sequentially with automatic power cycling between samples. Use Value: 1.2mA active current and 1µA shutdown enable multi-week operation on coin-cell batteries without external power management. |
Use Scenario: Handheld ECG monitor measuring differential lead voltages with high noise immunity. IC Role / Device Role / Timing Role: Dual-channel differential ADC digitizing LA-RA and LL-RA leads with programmable bipolar input range. Use Value: ±0.5 LSB INL and 73dB SINAD ensure clinical-grade waveform fidelity at 133ksps sampling. |
| Pen Digitizers | Battery-Powered Instruments |
Use Scenario: Active stylus interface detecting tip pressure and tilt angle via resistive or capacitive sensing elements. IC Role / Device Role / Timing Role: High-speed 4-channel ADC scanning X/Y electrode arrays and auxiliary sensors (e.g., button, battery voltage). Use Value: 1.5µs track/hold acquisition and 2.25MHz small-signal bandwidth capture rapid pen movement without aliasing. |
Use Scenario: Field-deployable multimeter measuring DC voltage, current, and resistance with autoranging. IC Role / Device Role / Timing Role: Precision ADC providing 12-bit resolution across multiple input ranges using COM-referenced single-ended inputs. Use Value: Internal 2.5V reference and ±0.5 LSB INL eliminate calibration drift and reduce BOM count versus external reference solutions. |
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 |
|---|---|---|---|
| MAX1246BCPE | A-grade replaced with B-grade: ±1 LSB INL vs. ±0.5 LSB; otherwise identical pinout, specs, and package | Acceptable for non-critical industrial monitoring where <0.025% linearity error is sufficient | Select MAX1246BCPE when cost sensitivity outweighs need for highest linearity; no PCB or firmware changes required |
| ADS7822U | TI 12-bit SAR ADC with 200ksps, 2.7–5.25V supply, no internal reference, SPI-only interface | Requires external 2.5V reference and level-shifting for 3V systems; higher speed but less integrated | Choose ADS7822U only if 200ksps is mandatory and reference sourcing is already established in design |
Compared with MAX1246BCPE, the MAX1246ACPE delivers tighter INL for metrology-grade accuracy; compared with ADS7822U, it reduces component count and layout risk via integrated reference and broader supply tolerance, albeit at slightly lower max throughput.
Availability
MAX1246ACPE is available at Aetrix Electronics and suitable for portable data logging, medical instruments, and battery-powered instruments requiring stable component supply, long-term obsolescence planning, and consistent parametric performance across production lots.
Supply support for MAX1246ACPE 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and portable applications.
The MAX1246/MAX1247 product line was designed for ultra-low-power, space-constrained data acquisition systems requiring integrated signal conditioning, precision conversion, and minimal external components.
FAQ
What is the operating temperature range for the MAX1246ACPE?
The MAX1246ACPE is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range aligns with its intended use in portable and benchtop instrumentation where environmental control is feasible. The device maintains ±0.5 LSB INL and 1.2mA supply current within this range, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
Does the MAX1246ACPE require an external reference voltage?
No, the MAX1246ACPE does not require an external reference voltage because it integrates a precision 2.5V reference buffer with ±0.8% initial accuracy and ±30ppm/°C temperature coefficient. This internal reference is enabled by default and requires only a 4.7µF capacitor at the VREF pin for stability-no external IC or resistor network is needed for standard operation.
How does the MAX1246ACPE handle differential input configurations?
The MAX1246ACPE supports true pseudo-differential operation using CH0/CH1 and CH2/CH3 pairs. In differential mode (SGL/DIF = 0), the positive input (IN+) and negative input (IN−) are selected from these pairs, and the device samples the voltage difference |IN+ − IN−|. The COM pin serves as the stable reference point for IN−, requiring ±0.5 LSB stability to maintain accuracy.
Can the MAX1246ACPE interface directly with a TMS320-series DSP?
Yes, the MAX1246ACPE can interface directly with TMS320-family DSPs using its dedicated SSTRB (serial strobe) output. In internal clock mode, SSTRB asserts low at conversion start and high at completion; in external mode, it pulses high for one SCLK period before the MSB decision-providing precise hardware synchronization without additional timing logic or GPIO polling.
What is the minimum acquisition time required before a valid conversion on the MAX1246ACPE?
The MAX1246ACPE requires a minimum acquisition time (tACQ) of 1.5µs, defined as the time needed for the internal track/hold circuit to settle the sampled input onto the hold capacitor. This value is guaranteed across all operating conditions and is independent of source impedance below 1kΩ. For higher-impedance sources, tACQ increases per the formula tACQ = 9 × (RS + 9kΩ) × 16pF.
MAX1246ACPE 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:
- -
MAX1246ACPE FAQ
1.How can I place an order for MAX1246ACPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1246ACPE 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 MAX1246ACPE reliable?
The price and inventory of MAX1246ACPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1246ACPE is usually 5 days.
3.What payment methods are accepted for MAX1246ACPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1246ACPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1246ACPE?
MAX1246ACPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1246ACPE 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 MAX1246ACPE?
For technical support, including MAX1246ACPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1246ACPE requirements.
6.How does Aetrix verify that MAX1246ACPE is sourced from the original manufacturer or authorized distributors?
All MAX1246ACPE 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 MAX1246ACPE meets industry standards.
7.What is the process for return or replacement of MAX1246ACPE?
All MAX1246ACPE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1246ACPE, 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 MAX1246ACPE part is unused and in its original packaging.
Return procedure for MAX1246ACPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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