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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:1,472
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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, 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 MAX1247ACPE+ datasheet, MAX1247ACPE+ pinout, MAX1247ACPE+ application, or MAX1247ACPE+ equivalent, this page delivers verified electrical specs, package mapping, functional role in data acquisition systems, and validated alternative parts for design continuity and sourcing flexibility.
Technical Context
The MAX1247ACPE+ employs successive-approximation register (SAR) architecture with an internal track/hold circuit that acquires input signals in ≤1.5µs. It supports both external clock mode (up to 2MHz) and internal clock mode (35–65kHz), enabling flexible timing control across µP interfaces.
Its analog front-end allows software-selectable input configurations: 4-channel single-ended or 2-channel differential, with COM pin defining zero-code reference. The device requires an external reference voltage applied to VREF (1.0V to VDD+50mV), and features a reference-buffer amplifier disabled by pulling REFADJ to VDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = ±0.5 LSB INL accuracy over full temperature range (0°C to +70°C). |
| Sampling Rate | 133ksps - achieved using 2MHz external clock and 15-clock conversion cycle; supports real-time sensor monitoring. |
| Supply Range | +2.7V to +5.25V - enables direct integration into 3.3V and 5V systems without level-shifting. |
| 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) - decouples accuracy from internal drift; supports precision external references like REF5025. |
| INL / DNL | ±2.0 LSB / ±0.8 LSB - ensures monotonicity and predictable code transitions across all channels. |
| SINAD | 73dB at 10kHz - supports >11.5 ENOB for clean digitization of audio-band and sensor signals. |
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 standard through-hole prototyping and industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; bypass with 0.1µF near pin. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Software-selectable as single-ended (vs. COM) or differential pairs (CH0/CH1, CH2/CH3); max input swing = AGND–0.3V to VDD+0.3V. |
| COM (Pin 6) | Common-mode reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB; connects to AGND or mid-supply for bipolar operation. |
| SHDN (Pin 7) | Three-level shutdown control | Pull low → full power-down (1µA); float → external compensation; pull high → internal compensation (reference buffer disabled). |
| AGND (Pin 10) | Analog ground return | Separate from DGND; required for <±0.5 LSB offset matching; ties to system analog ground plane. |
| DGND (Pin 11) | Digital ground return | Isolates digital switching noise from analog section; connects to digital ground plane with single-point tie to AGND. |
| VREF (Pin 8) | Reference input/output | Accepts external 1.0V–(VDD+50mV) reference; internal buffer disabled when REFADJ = VDD; no internal reference generation. |
| SCLK (Pin 16) | Serial clock input | Drives data I/O and (in external clock mode) SAR conversion; 40–60% duty cycle required; max 2MHz frequency. |
| CS (Pin 15) | Active-low chip select | Enables serial interface; DOUT and SSTRB go high-Z when CS = high; controls frame synchronization for multi-device buses. |
| DIN (Pin 14) | Serial data input | Receives 8-bit control byte on SCLK rising edge; defines channel, polarity, mode, and clock source (PD1/PD0 bits). |
| DOUT (Pin 12) | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge; high-Z when CS = high; compatible with SPI master MISO. |
| SSTRB (Pin 13) | Serial strobe output | In external clock mode: pulses high for one SCLK period before MSB decision; used for TMS320-family DSP synchronization. |
| REFADJ (Pin 9) | Reference buffer control | Tie to VDD to disable internal reference buffer; floating or grounded for external compensation configuration. |
Key Features
| Feature | Design Value |
|---|---|
| 4-wire serial interface | Fully compatible with SPI/QSPI/MICROWIRE protocols-no glue logic needed; CPOL=0, CPHA=0 configuration required. |
| Software-configurable inputs | Single control byte selects unipolar/bipolar, single-ended/differential, and channel-enables runtime reconfiguration without hardware change. |
| Low-power shutdown modes | Full power-down (1µA) and fast power-down (54µA) reduce average current in burst-sampling applications. |
| Track/hold acquisition time | ≤1.5µs - supports accurate sampling of signals up to 2.25MHz small-signal bandwidth without external buffering. |
| Channel-to-channel matching | ±0.25 LSB offset matching and ±0.25 LSB gain matching - critical for multi-sensor differential measurements and ratiometric sensing. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure at 1ksps intervals. IC Role / Device Role / Timing Role: Primary ADC digitizing four analog sensor outputs with configurable gain and polarity; synchronized via external µP clock. Use Value: 54µA active current at 1ksps extends AA battery life beyond 12 months; software-selectable inputs eliminate external multiplexer. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with high common-mode rejection. IC Role / Device Role / Timing Role: Dual-channel differential ADC capturing cardiac waveforms at 133ksps; COM referenced to mid-supply for bipolar operation. Use Value: ±0.25 LSB channel matching ensures accurate differential amplitude measurement; 73dB SINAD preserves ST-segment fidelity. |
| Pen Digitizers | Process Control Sensors |
|
Use Scenario: Resistive touch overlay in industrial HMI detecting stylus position via X/Y electrode voltage scanning. IC Role / Device Role / Timing Role: 4-channel single-ended ADC sequentially sampling four analog electrodes; controlled via SPI from ARM Cortex-M0+. Use Value: 1.5µs acquisition time enables sub-millisecond coordinate updates; unipolar mode matches 0–2.5V electrode voltage range. |
Use Scenario: Modular PLC analog input module conditioning 4–20mA current-loop transducer signals in factory automation. IC Role / Device Role / Timing Role: Isolated ADC digitizing four field-transmitter outputs; external 2.5V reference ensures traceable calibration. Use Value: External VREF support allows use of metrology-grade reference ICs; ±2.0 LSB INL meets IEC 61000-4-3 immunity requirements. |
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 only; no bipolar mode; 8-pin SOIC package. | Lacks software-configurable bipolar/differential inputs and external reference support; unsuitable for ratiometric or dual-range designs. | Select only if board space is constrained and unipolar single-ended operation suffices with fixed 2.5V reference. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, SPI interface; internal 2.5V reference; supports pseudo-differential inputs only. | Higher channel count but no true differential pair selection; larger 20-pin TSSOP package; higher 3.2mA typical supply current. | Prefer for high-channel-density systems where throughput >133ksps is required and external reference is not mandatory. |
Compared with ADS7822U and AD7490BRUZ, MAX1247ACPE+ uniquely balances external reference flexibility, true differential channel pairing, and ultra-low 54µA/1ksps power-making it optimal for portable, multi-range, and battery-sensitive data acquisition.
Availability
MAX1247ACPE+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and process control applications 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.
The MAX1246/MAX1247 family was designed for low-power, high-accuracy data acquisition in space- and energy-constrained systems-emphasizing flexible input configuration, minimal external components, and seamless µP interfacing.
FAQ
What is the operating temperature range for MAX1247ACPE+?
The MAX1247ACPE+ is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range aligns with its ACPE+ suffix designation and supports deployment in indoor instrumentation, handheld devices, and non-automotive industrial environments where thermal extremes are controlled.
Does MAX1247ACPE+ include an internal voltage reference?
No, MAX1247ACPE+ does not include an internal voltage reference. Unlike the MAX1246 variant, the MAX1247ACPE+ requires an external reference voltage applied to the VREF pin (1.0V to VDD+50mV). Its internal reference buffer must be disabled by connecting REFADJ to VDD.
Can MAX1247ACPE+ perform differential measurements between arbitrary channels?
MAX1247ACPE+ supports true differential measurements only between predefined pairs: CH0–CH1 and CH2–CH3. It does not allow arbitrary channel combinations (e.g., CH0–CH2) in differential mode. Configuration is controlled via the SEL2–SEL0 and SGL/DIF bits in the 8-bit control byte.
What is the minimum acquisition time required before conversion starts in MAX1247ACPE+?
The guaranteed maximum acquisition time (tACQ) for MAX1247ACPE+ is 1.5µs. This is the minimum interval the track/hold circuit requires to settle after the last control bit is clocked in, and it must be respected to maintain ±0.5 LSB INL performance across all operating conditions.
How does the SHDN pin function in MAX1247ACPE+?
The SHDN pin on MAX1247ACPE+ provides three distinct states: pulled low → full power-down (1µA); pulled high → internal compensation mode (reference buffer disabled); left floating → external compensation mode. It enables precise power-state control without requiring additional GPIO resources.
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:
- 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-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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