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Analog Devices Inc./Maxim Integrated MAX147AEAP+
- Part No.:
- MAX147AEAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX147AEAP+.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:380
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Product details
Overview
MAX147AEAP+ from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with software-configurable unipolar/bipolar and single-ended/differential inputs, operating from a single +2.7V to +5.25V supply. It integrates an on-chip track/hold, SPI/QSPI/MICROWIRE-compatible 4-wire serial interface, and supports external reference input. It delivers 133ksps conversion rate, ±0.5 LSB INL, and 73dB SINAD - ideal for portable data loggers and battery-powered medical instruments.
For engineers reviewing the MAX147AEAP+ datasheet, MAX147AEAP+ pinout, MAX147AEAP+ application, or MAX147AEAP+ equivalent, key selection considerations include its external-reference architecture, 20-pin SSOP package, shutdown current of 1µA, and compatibility with TMS320-family DSPs via SSTRB strobe output.
Technical Context
The MAX147AEAP+ uses successive-approximation (SAR) architecture with integrated track/hold, supporting both internal clock (for autonomous timing) and external serial clock (for synchronous system integration). Its analog front-end allows pseudo-differential sampling with configurable COM reference, enabling precise measurement of small differential signals while maintaining high common-mode rejection.
It implements a flexible 8-bit control byte (START, SEL2–SEL0, UNI/BIP, SGL/DIF, PD1/PD0) to select channel, polarity, input mode, and power state. The SSTRB output provides deterministic timing alignment for DSP interfacing - pulsing one SCLK cycle before MSB output in external clock mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for high-fidelity signal digitization. |
| Conversion Rate | 133ksps at 2MHz SCLK - enables real-time acquisition of fast transients in process control loops. |
| INL (Integral Nonlinearity) | ±0.5 LSB max - ensures monotonicity and <0.012% full-scale error after calibration. |
| SINAD | 73dB at 10kHz - supports >11.8 effective bits for low-noise sensor readout. |
| Supply Range | +2.7V to +5.25V - compatible with industrial 3.3V and 5V logic rails without level-shifting. |
| Shutdown Current | 1µA - extends battery life in intermittent-sampling applications like pen digitizers. |
| Reference Input | External VREF pin (2.500V typical) - allows precision system-level reference sourcing and temperature drift control. |
Pinout & Package
MAX147AEAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, optimized for compact PCB layouts in space-constrained instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Software-selectable as 8 single-ended or 4 differential pairs; input range = 0V to VREF (unipolar) or ±VREF/2 (bipolar). |
| COM (Pin 9) | Common-mode reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB during conversion. |
| SHDN (Pin 10) | Three-level shutdown control | Low = full shutdown; high = internal compensation; float = external compensation - enables flexible reference buffer configuration. |
| VREF (Pin 11) | Reference input/output | Accepts external 2.500V reference; internal buffer disabled when REFADJ tied to VDD - critical for accuracy-critical systems. |
| REFADJ (Pin 12) | Reference buffer adjustment | ±1.5% fine-tuning range; tie to VDD to disable internal buffer - required for MAX147 operation. |
| DOUT (Pin 15) | Serial data output | MSB-first, clocked on SCLK falling edge; high-impedance when CS = high - enables bus sharing. |
| AGND / DGND (Pins 13, 14) | Analog/digital ground | Separate AGND/DGND pins minimize digital noise coupling into analog path - essential for 12-bit accuracy. |
| SCLK (Pin 19) | Serial clock input | Drives data transfer and (in external mode) conversion timing; 40–60% duty cycle required - synchronizes with host MCU. |
| CS (Pin 18) | Chip select | Active-low enable; controls DOUT three-state behavior and initiates control-byte latching - enables multi-device SPI buses. |
| DIN (Pin 17) | Serial data input | Accepts 8-bit control byte on SCLK rising edge - defines channel, mode, and clock/power-down state per conversion. |
| SSTRB (Pin 16) | Serial strobe output | Pulses high one SCLK before MSB in external clock mode - provides hardware handshake for TMS320 DSPs. |
| VDD (Pin 20) | Positive supply | +2.7V to +5.25V operation - eliminates need for dedicated ADC supply rail in mixed-voltage systems. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel multiplexer with software-configurable input modes | Reduces external signal conditioning components by enabling on-chip channel routing and polarity selection. |
| SPI/QSPI/MICROWIRE/TMS320-compatible interface | Eliminates protocol translation logic - direct connection to industry-standard microcontrollers and DSPs. |
| External reference architecture (VREF + REFADJ) | Enables system-level reference traceability and thermal drift matching across multiple ADCs in a design. |
| 1µA shutdown current with automatic power-down | Supports ultra-low-power wake-up architectures where ADC powers up only for scheduled measurements. |
| Track/hold acquisition time ≤1.5µs | Allows accurate sampling of signals with source impedances up to 1kΩ without external buffering. |
| ±0.5 LSB INL and 73dB SINAD | Meets requirements for Class I medical devices and precision industrial sensors per IEC 60601/IEC 61000-4-30. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over 72-hour deployments. IC Role / Device Role / Timing Role: Primary ADC acquiring 8 analog sensor outputs sequentially at 100Hz with automatic shutdown between samples. Use Value: 1µA shutdown current extends CR2032 battery life to >12 months; 2.7V–5.25V supply range accommodates aging battery voltage drop. |
Use Scenario: Handheld ECG monitor digitizing differential lead signals with baseline wander correction. IC Role / Device Role / Timing Role: 4-channel differential ADC capturing Lead I, II, III, and aVR with programmable bipolar input range (±1.25V). Use Value: ±0.5 LSB INL ensures diagnostic-grade amplitude accuracy; SSTRB output synchronizes with ARM Cortex-M4 DSP firmware. |
| Battery-Powered Test Equipment | Industrial Process Control |
|
Use Scenario: Portable multimeter measuring DC voltage, current, and resistance using shared analog front-end. IC Role / Device Role / Timing Role: Configurable 8-channel ADC switching between voltage dividers, shunt amplifiers, and RTD bridges. Use Value: Software-selectable unipolar/bipolar and single-ended/differential modes eliminate hardware reconfiguration; 133ksps supports fast continuity testing. |
Use Scenario: PLC analog input module acquiring 4–20mA transmitter outputs and thermocouple signals in harsh factory environments. IC Role / Device Role / Timing Role: Isolated ADC channel interface with external 2.500V reference for long-term stability across temperature. Use Value: External reference architecture enables traceable calibration to NIST standards; ±30ppm/°C VREF tempco meets IEC 61000-6-2 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply, 12-bit, 200ksps, internal reference only, no SSTRB output | Lacks hardware strobe for DSP sync; requires external reference buffer if system-level reference needed | Choose for higher speed where SSTRB is unnecessary and internal reference suffices |
| AD7490BRUZ | 2.7V–5.25V supply, 12-bit, 1MSPS, internal reference, SPI-only interface, no REFADJ | Higher speed but fixed unipolar-only input; no external reference support or COM pin for bipolar offset tuning | Choose for high-throughput data acquisition where bipolar/differential flexibility is not required |
Compared with ADS7822U and AD7490BRUZ, the MAX147AEAP+ uniquely combines external reference control, SSTRB hardware handshake, and software-configurable bipolar/differential operation - making it optimal for portable, battery-sensitive, and DSP-integrated measurement systems requiring field calibration and signal flexibility.
Availability
MAX147AEAP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and industrial process control requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.
Supply support for MAX147AEAP+ 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 and mixed-signal ICs for demanding industrial, medical, and automotive applications - emphasizing low power, high accuracy, and robust integration.
The MAX146/MAX147 product line was engineered specifically for portable, battery-powered measurement systems requiring 12-bit resolution, flexible input configurations, and ultra-low quiescent current - balancing performance, size, and energy efficiency.
FAQ
What is the reference architecture of the MAX147AEAP+?
The MAX147AEAP+ requires an external reference voltage applied to the VREF pin and uses the REFADJ pin to disable its internal reference buffer (by tying REFADJ to VDD). Unlike the MAX146, it has no internal 2.5V reference - this architecture enables system-level reference sourcing, improved temperature stability, and calibration traceability. The MAX147AEAP+ datasheet specifies VREF = 2.500V nominal with ±0.3% initial accuracy.
Does the MAX147AEAP+ support differential input mode?
Yes, the MAX147AEAP+ supports true pseudo-differential input mode via software configuration: setting SGL/DIF = 0 selects four differential pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7), with COM serving as the common reference. The device maintains ±0.5 LSB matching between channels, enabling accurate measurement of small differential signals up to ±VREF/2 - critical for bridge sensor and thermocouple applications.
What is the function of the SSTRB pin on the MAX147AEAP+?
The SSTRB (Serial Strobe) pin on the MAX147AEAP+ provides hardware synchronization for digital signal processors: in external clock mode, it pulses high for exactly one SCLK period immediately before the MSB of the 12-bit conversion result appears on DOUT. This deterministic timing allows TMS320-family DSPs to latch data without polling or software delay - reducing firmware overhead and improving real-time determinism in motor control or audio sampling.
Can the MAX147AEAP+ operate from a 3.3V supply?
Yes, the MAX147AEAP+ operates across +2.7V to +5.25V, fully supporting standard 3.3V logic rails. At VDD = 3.3V, it maintains 133ksps conversion rate, ±0.5 LSB INL, and 1µA shutdown current. Its digital I/O thresholds (VIH = 0.7×VDD, VIL = 0.3×VDD) ensure reliable interfacing with 3.3V MCUs without level shifters - verified in the MAX147AEAP+ electrical characteristics table under "Digital Inputs".
How does the SHDN pin function on the MAX147AEAP+?
The SHDN pin on the MAX147AEAP+ is a three-level control: pulled low → full shutdown (1µA); pulled high → internal compensation mode (reference buffer enabled); left floating → external compensation mode (reference buffer disabled, requiring external capacitor at REFADJ). This flexibility allows designers to optimize reference stability versus board area - confirmed in the MAX147AEAP+ Pin Description section and Figure 4's equivalent input circuit.
MAX147AEAP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 133k
- Number of Inputs:
- 4, 8
- 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 ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX147AEAP+ FAQ
1.How can I place an order for MAX147AEAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX147AEAP+ 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 MAX147AEAP+ reliable?
The price and inventory of MAX147AEAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX147AEAP+ is usually 5 days.
3.What payment methods are accepted for MAX147AEAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX147AEAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX147AEAP+?
MAX147AEAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX147AEAP+ 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 MAX147AEAP+?
For technical support, including MAX147AEAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX147AEAP+ requirements.
6.How does Aetrix verify that MAX147AEAP+ is sourced from the original manufacturer or authorized distributors?
All MAX147AEAP+ 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 MAX147AEAP+ meets industry standards.
7.What is the process for return or replacement of MAX147AEAP+?
All MAX147AEAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX147AEAP+, 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 MAX147AEAP+ part is unused and in its original packaging.
Return procedure for MAX147AEAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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