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Analog Devices Inc./Maxim Integrated MAX1247ACPE
- Part No.:
- MAX1247ACPE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1247ACPE.pdf
- Description:
- IC ADC 12BIT SAR 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,758
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Product details
Overview
MAX1247ACPE 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 (3V), and supports external reference input at VREF pin. It is used in portable data loggers and battery-powered medical instruments requiring low-power, high-accuracy digitization.
For engineers reviewing the MAX1247ACPE datasheet, MAX1247ACPE pinout, MAX1247ACPE application, or MAX1247ACPE equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for production deployment.
Technical Context
The MAX1247ACPE uses successive-approximation register (SAR) architecture with an internal track/hold circuit that acquires input signals in ≤1.5µs and supports both internal clock (up to 0.225MHz) and external clock (up to 2.0MHz) conversion modes. Its analog front-end allows software-selectable input configurations: 4-channel single-ended or 2-channel differential, with COM pin defining zero-code reference.
It features a reference-buffer amplifier with ±1.5% adjustment range at REFADJ, requires external reference voltage (1.0V to VDD+50mV), and provides serial strobe (SSTRB) output for TMS320-family DSP synchronization. Power management includes hardware SHDN pin and software-selectable full/fast power-down modes, enabling <1µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for precise measurement of small signal changes |
| INL (Max) | ±2.0 LSB - limits end-point linearity error to ±0.049% of full-scale range, critical for calibration-sensitive systems |
| Sampling Rate | 133ksps - enables real-time capture of signals up to ~66kHz (Nyquist), suitable for audio-band and sensor monitoring |
| Supply Range | +2.7V to +5.25V - supports direct connection to Li-ion (3.0–4.2V) and 5V logic rails without LDO |
| Power (133ksps) | 1.2mA @ 3V - draws only 3.6mW, enabling >100-hour operation on 3.6V/100mAh coin cell in burst-sampling mode |
| Reference Input | External VREF (1.0V to VDD+50mV) - decouples accuracy from internal drift; supports precision external references like REF5025 |
| Interface | SPI/QSPI/MICROWIRE 4-wire - interoperates with standard microcontroller peripherals without level-shifting or glue logic |
Pinout & Package
MAX1247ACPE is housed in a 16-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and 0.1-inch pin pitch, compatible with through-hole prototyping and industrial PCB assembly.
| 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 to AGND |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable as single-ended (vs. COM) or differential pairs (CH0/CH1, CH2/CH3); max input = AGND−0.3V to VDD+0.3V |
| COM (Pin 6) | Analog ground reference | Sets zero-code point in single-ended mode; must be stable to ±0.5 LSB; separate from AGND/DGND |
| SHDN (Pin 7) | Three-level shutdown control | Low = full shutdown (<1µA); float = external ref compensation; high = internal ref compensation (not used in MAX1247) |
| AGND (Pin 10) | Analog ground return | Reference for analog circuitry; must be star-connected to minimize noise coupling into ADC core |
| DGND (Pin 11) | Digital ground return | Return path for serial interface; isolated from AGND except at single-point system ground |
| VREF (Pin 8) | External reference input | Accepts 1.0V–(VDD+50mV); disables internal buffer when REFADJ tied to VDD; input impedance = 18–25kΩ |
| SCLK (Pin 16) | Serial clock input | Drives data I/O and (in external clock mode) SAR conversion; 40–60% duty cycle required; max 2MHz |
| CS (Pin 15) | Active-low chip select | Enables serial interface; DOUT goes high-Z when CS high; timing-critical for SSTRB and data validity windows |
| DIN (Pin 14) | Serial data input | Receives 8-bit control byte (START, SEL2–SEL0, UNI/BIP, SGL/DIF, PD1/PD0) on SCLK rising edge |
| DOUT (Pin 12) | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge; high-Z when CS high; load capacitance ≤50pF |
| SSTRB (Pin 13) | Serial strobe output | Pulses high for one SCLK period before MSB in external clock mode; asserts low-to-high at conversion end in internal clock mode |
| REFADJ (Pin 9) | Reference buffer adjust | Tie to VDD to disable internal buffer (required for MAX1247); open or grounded for external compensation network |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel multiplexer with pseudo-differential sampling | Supports flexible sensor interfacing: 4 single-ended sensors (e.g., thermistors) or 2 differential sensors (e.g., strain gauges) without external MUX |
| Software-configurable unipolar/bipolar and single-ended/differential modes | Eliminates need for external op-amp level-shifting or gain stages-reduces BOM count and layout area by ≥3 components |
| External reference input with ±1.5% REFADJ adjustment range | Enables use of ultra-stable external references (e.g., ADR4525) to achieve <10ppm/°C system gain drift over temperature |
| Hardware SHDN pin + software power-down modes | Allows rapid entry/exit from <1µA shutdown state-ideal for wake-on-event architectures in portable IoT nodes |
| SPI/QSPI/MICROWIRE/TMS320-compatible interface | Integrates directly with TI C2000, ST STM32, and NXP Kinetis MCUs using stock peripheral drivers-no custom firmware needed |
Applications
| Portable Data Logging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure every 10 seconds. IC Role / Device Role / Timing Role: Primary ADC digitizing four analog sensor outputs; configured in single-ended unipolar mode with external 2.5V reference for 12-bit resolution. Use Value: 1.2mA active current and <1µA shutdown enable >1-year operation on two AA alkaline cells; serial interface simplifies MCU integration. | Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with motion artifact rejection. IC Role / Device Role / Timing Role: Dual-channel differential ADC sampling at 1ksps; COM referenced to right-leg drive (RLD) circuit for common-mode rejection. Use Value: Channel-to-channel offset matching ≤0.25 LSB ensures accurate differential gain; 73dB SINAD preserves diagnostic waveform fidelity. |
| Pen Digitizers | Battery-Powered Instruments |
Use Scenario: Active stylus tablet measuring X/Y electrode voltage differentials across resistive grid. IC Role / Device Role / Timing Role: High-speed 4-channel ADC scanning electrode pairs; uses internal clock mode for deterministic conversion timing independent of host CPU load. Use Value: 1.5µs acquisition time supports >500Hz pen position update rate; SSTRB output synchronizes digitizer controller timing. | Use Scenario: Field-deployable pH/mV meter requiring 12-bit resolution and 0–5V input range. IC Role / Device Role / Timing Role: Single-ended ADC with external 5.0V reference; software-configured for unipolar 0–5V full-scale range. Use Value: External reference input enables direct use of system 5V rail as reference-eliminates dedicated reference IC and saves board space. |
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 fixed at 2.5V; no bipolar mode; 8-pin SOIC package | Lacks software-configurable input polarity and differential mode; unsuitable for bipolar sensor interfaces or COM-referenced designs | Select when only unipolar single-ended inputs are needed and board space is constrained-requires redesign for differential or bipolar use cases |
| AD7490BRUZ | 12-bit, 1MSPS, SPI interface; internal 2.5V reference; 16-channel mux; 24-pin TSSOP package | Higher speed and channel count but higher power (3.2mA @ 1MSPS); no external reference option; larger footprint | Choose for high-channel-count data acquisition where throughput >133ksps is required and external reference is not mandatory |
Compared with ADS7822U and AD7490BRUZ, the MAX1247ACPE uniquely balances low power (1.2mA), flexible input configuration (bipolar/differential), and external reference support in a through-hole DIP package-making it optimal for legacy-compatible, battery-sensitive, and precision analog designs.
Availability
MAX1247ACPE 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 RoHS-compliant through-hole packaging.
Supply support for MAX1247ACPE 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 industrial, medical, and automotive applications.
The MAX1246/MAX1247 product line delivers low-power, serial-interface 12-bit ADCs optimized for portable and battery-operated systems where size, power, and interface simplicity are critical.
FAQ
What is the maximum recommended source impedance for analog inputs on the MAX1247ACPE?
The MAX1247ACPE specifies a 1.5µs minimum acquisition time (tACQ), calculated as tACQ = 9 × (RS + 9kΩ) × 16pF. For reliable performance, source impedance RS should not exceed 1kΩ without external input capacitance. If higher impedances are unavoidable, a 0.01µF capacitor placed at each CHx input reduces effective bandwidth but maintains DC accuracy. The MAX1247ACPE's input protection diodes clamp to VDD and AGND, so RS > 1kΩ requires careful anti-alias filtering to avoid signal distortion.
Does the MAX1247ACPE support bipolar input mode, and how is it configured?
Yes, the MAX1247ACPE supports bipolar input mode via the UNI/BIP bit (bit 3) in the 8-bit control byte: setting UNI/BIP = 0 configures the ADC for ±VREF/2 input range. In this mode, COM must be held at VREF/2 (e.g., using a resistor divider from VREF), and the output is two's complement. Bipolar operation is confirmed in the Electrical Characteristics table (THD, SINAD tested in bipolar mode) and Figure 17 (output code vs. input voltage). The MAX1247ACPE's bipolar capability enables direct digitization of AC-coupled sensor outputs without external level-shifting.
Can the MAX1247ACPE operate with a 5V supply, and what are the implications for reference voltage?
Yes, the MAX1247ACPE supports VDD up to +5.25V. When using 5V, the external reference voltage applied to VREF must be between 1.0V and 5.3V (VDD + 50mV). The device's reference input resistance is 18–25kΩ, so a precision reference like the REF5025 (2.5V, 3ppm/°C) can be used directly. Note that VREF accuracy directly limits overall ADC gain error-e.g., a 0.1% VREF tolerance contributes ~0.1% full-scale error. The MAX1247ACPE does not regulate or buffer VREF internally beyond the REFADJ-adjustable amplifier, which is disabled in MAX1247 variants.
What is the function of the SHDN pin on the MAX1247ACPE, and how does it differ from software power-down?
The SHDN pin on the MAX1247ACPE is a three-level hardware control: pulled low → full shutdown (<1µA); left floating → external reference compensation mode; pulled high → internal reference compensation (not applicable to MAX1247ACPE, which lacks internal reference). Software power-down is selected via PD1/PD0 bits in the control byte (00 = full, 01 = fast). Hardware SHDN overrides software mode and guarantees immediate current reduction, while software power-down retains register state and allows faster wake-up. Both methods are validated in the datasheet's IDD tables and Typical Operating Characteristics (Figures MAX1247-05 and MAX1247-08).
Is the MAX1247ACPE pin-compatible with the MAX1246ACPE, and what are the key functional differences?
No, the MAX1247ACPE is not pin-compatible with the MAX1246ACPE due to differing reference architectures: MAX1246 integrates a 2.5V internal reference and uses VREF as output, while MAX1247 requires external reference input at VREF and disables the internal buffer (REFADJ tied to VDD). Pin functions are identical, but VREF usage, SHDN behavior (internal compensation unused), and supply range (+2.7V–+5.25V vs. +2.7V–+3.6V) differ. Swapping them requires schematic changes to VREF routing, REFADJ connection, and supply decoupling-confirmed in the General Description and Absolute Maximum Ratings sections.
MAX1247ACPE 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
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1247ACPE FAQ
1.How can I place an order for MAX1247ACPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1247ACPE 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 MAX1247ACPE reliable?
The price and inventory of MAX1247ACPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1247ACPE is usually 5 days.
3.What payment methods are accepted for MAX1247ACPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1247ACPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1247ACPE?
MAX1247ACPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1247ACPE 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 MAX1247ACPE?
For technical support, including MAX1247ACPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1247ACPE requirements.
6.How does Aetrix verify that MAX1247ACPE is sourced from the original manufacturer or authorized distributors?
All MAX1247ACPE 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 MAX1247ACPE meets industry standards.
7.What is the process for return or replacement of MAX1247ACPE?
All MAX1247ACPE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1247ACPE, 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 MAX1247ACPE part is unused and in its original packaging.
Return procedure for MAX1247ACPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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