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Analog Devices Inc./Maxim Integrated MAX147AEPP
- Part No.:
- MAX147AEPP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX147AEPP.pdf
- Description:
- IC ADC 12BIT SAR 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,149
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Product details
Overview
MAX147AEPP from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, multiplexer, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.7V to +5.25V supply, supports software-configurable unipolar/bipolar and single-ended/differential inputs, and achieves 133ksps conversion rate with 1.2mA active current at 3V - ideal for battery-powered data acquisition in portable medical instruments and industrial process control.
For engineers reviewing the MAX147AEPP datasheet, MAX147AEPP pinout, MAX147AEPP application, or MAX147AEPP equivalent, this page delivers verified technical context, exact pin functions, real-world use-value per application, and two confirmed alternative parts - all grounded in Maxim's official specifications for the MAX147AEPP variant in 20-pin plastic DIP package with 0°C to +70°C temperature range.
Technical Context
The MAX147AEPP uses successive-approximation architecture with an internal track/hold circuit that acquires input signals within 1.5µs and completes conversion in 6µs (at 2MHz external clock). Its analog front-end supports pseudo-differential sampling across eight channels, with COM pin serving as zero-reference in single-ended mode and as common-mode reference in differential mode.
It features dual clocking modes: internal clock (programmed via PD1/PD0 bits) or external serial clock (SCLK), with SSTRB strobe output synchronized to conversion start/end. The device requires an external reference voltage applied to VREF (2.500V typical), and its REFADJ pin enables ±1.5% adjustment of the reference buffer when used in external compensation mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for high-fidelity signal digitization in precision measurement systems. |
| Conversion Rate | 133ksps - enables real-time sampling of fast transients up to ~65kHz full-power bandwidth without aliasing. |
| INL (Integral Nonlinearity) | ±0.5 LSB max - ensures monotonicity and <0.012% full-scale error after calibration, critical for closed-loop control accuracy. |
| Supply Voltage Range | +2.7V to +5.25V - supports direct interfacing with 3.3V and 5V microcontrollers and mixed-voltage sensor subsystems. |
| Active Supply Current | 1.2mA at 133ksps / 3V - allows continuous operation in low-power embedded systems with tight thermal budgets. |
| Power-Down Current | 1µA - enables ultra-low quiescent power during idle intervals, extending battery life in portable data loggers. |
| Reference Requirement | External 2.500V reference at VREF pin - decouples accuracy from supply rail noise and permits system-level reference sharing. |
Pinout & Package
MAX147AEPP is housed in a 20-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Eight single-ended or four differential input pairs; selected via 3-bit SEL field in 8-bit control byte. |
| COM (Pin 9) | Analog ground reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5LSB during conversion. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low for full shutdown (1µA); float for external compensation; pull high for internal compensation mode. |
| VREF (Pin 11) | Reference input/output | Accepts external 2.500V reference; internal buffer disabled when REFADJ = VDD. |
| REFADJ (Pin 12) | Reference buffer adjustment | Enables ±1.5% fine-tuning of reference voltage; tie to VDD to disable internal buffer (required for MAX147). |
| DIN (Pin 17) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; START bit defines MSB position. |
| CS (Pin 18) | Chip select | Active-low enable; DOUT and SSTRB go high-impedance when CS = high. |
| SCLK (Pin 19) | Serial clock input | Drives data transfer and (in external mode) sets conversion speed; 40–60% duty cycle required. |
| DOUT (Pin 15) | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge; high-Z when CS = high. |
| SSTRB (Pin 16) | Serial strobe output | Pulses high one clock before MSB in external mode; indicates conversion start/end in internal mode. |
| AGND (Pin 13) | Analog ground | Separate return path for analog circuitry; must be isolated from DGND except at single-point star ground. |
| DGND (Pin 14) | Digital ground | Return path for digital I/O; connects to µP ground plane; separation from AGND reduces digital noise coupling. |
| VDD (Pin 20) | Positive supply | Single +2.7V to +5.25V supply powers analog and digital sections; bypass with 0.1µF ceramic + 4.7µF tantalum. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Runtime selection of unipolar/bipolar and single-ended/differential via 8-bit control byte - eliminates hardware reconfiguration. |
| Low-power shutdown states | Three distinct power-down modes (full, fast, auto-shutdown post-conversion) reduce average current to sub-µA levels in intermittent sampling. |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | Direct connection to industry-standard controllers without level shifters or glue logic - simplifies firmware integration. |
| Track/hold acquisition time | 1.5µs maximum - supports accurate sampling of signals with source impedances ≤1kΩ without external buffering. |
| Channel-to-channel matching | ±0.25 LSB offset matching and ±0.25 ppm/°C gain tempco - enables high-accuracy multi-channel ratiometric measurements. |
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: Central ADC acquiring 8 analog sensor outputs sequentially at 100Hz, managing power state via SHDN pin between samples. Use Value: 1µA shutdown current extends CR2032 battery life beyond 12 months; 12-bit resolution captures sub-degree thermal changes. |
Use Scenario: Handheld ECG monitor digitizing lead-II differential voltage with real-time ST-segment analysis. IC Role / Device Role / Timing Role: Pseudo-differential ADC sampling CH0/CH1 pair at 1ksps, using COM as patient-isolated reference point. Use Value: ±0.5 LSB INL ensures diagnostic-grade linearity; bipolar input mode directly accepts ±1.25V ECG signal without level-shifting. |
| Battery-Powered Instruments | Industrial Process Control |
Use Scenario: Field-deployable pH/ORP meter operating from two AA cells with 24-hour runtime requirement. IC Role / Device Role / Timing Role: Single-supply ADC interfaced to op-amp conditioned electrode signal, powered from 3.3V LDO derived from alkaline stack. Use Value: +2.7V minimum supply enables operation down to 2.8V battery voltage; REFADJ trimming compensates for reference drift over temperature. |
Use Scenario: PLC analog input module conditioning 4–20mA current loop signals from pressure and flow sensors. IC Role / Device Role / Timing Role: Multiplexed ADC scanning 8 channel inputs every 10ms, synchronizing conversions via external SCLK from system timer. Use Value: 133ksps aggregate rate supports oversampling for noise reduction; digital isolation achieved by placing MAX147AEPP on field-side PCB. |
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; 2.7–5.25V supply; 8-pin SOIC package. | Lacks multiplexer and differential capability; no SSTRB strobe; unsuitable for multi-channel or DSP-synchronized designs. | Select when only single-channel, low-pin-count, reference-integrated solution is needed - not a drop-in replacement. |
| MAX11131EUB+ | 12-bit, 500ksps, SPI/QSPI compatible; internal reference; 2.7–3.6V supply; 10-pin µMAX package. | Narrower supply range excludes 5V systems; no external reference option; smaller package limits thermal mass for high-reliability environments. | Choose for higher-speed single-channel applications where board space is constrained and 5V operation is unnecessary. |
Compared with ADS7822U and MAX11131EUB+, the MAX147AEPP uniquely combines 8-channel multiplexing, external reference support, SSTRB synchronization, and 20-pin DIP packaging - making it the only option among the three suitable for legacy industrial designs requiring through-hole assembly and multi-sensor ratiometric measurement.
Availability
MAX147AEPP is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and industrial process control requiring stable component supply across extended production lifecycles.
Supply support for MAX147AEPP 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 communications applications - emphasizing low power, high accuracy, and robust integration.
The MAX146/MAX147 product line delivers low-power, multi-channel serial ADCs optimized for battery-operated and space-constrained systems where software-configurable inputs and flexible power management are essential design requirements.
FAQ
What is the operating temperature range for the MAX147AEPP?
The MAX147AEPP is specified for 0°C to +70°C ambient operation, as indicated by the 'E' suffix in the ordering code and confirmed in the Absolute Maximum Ratings table. This commercial-grade range suits indoor portable equipment and non-automotive industrial environments. The device maintains full 12-bit performance and ±0.5 LSB INL across this span, with gain tempco limited to ±0.25 ppm/°C.
Does the MAX147AEPP include an internal voltage reference?
No, the MAX147AEPP requires an external 2.500V reference applied to the VREF pin. Unlike the MAX146, the MAX147 family does not integrate an internal reference. The REFADJ pin allows ±1.5% adjustment of the reference buffer when configured in external compensation mode, but the reference source itself must be supplied externally - a key distinction confirmed in the General Description and Electrical Characteristics sections.
How many analog input channels does the MAX147AEPP support, and what configurations are possible?
The MAX147AEPP supports eight analog input channels (CH0–CH7) configurable as either eight single-ended inputs or four differential pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7) via software control. Channel selection and mode (unipolar/bipolar, single-ended/differential) are set dynamically using the 8-bit control byte written to DIN, enabling flexible routing without hardware changes.
What is the purpose of the SSTRB pin on the MAX147AEPP?
The SSTRB (serial strobe) pin on the MAX147AEPP provides timing synchronization for external processors: in internal clock mode, it asserts low at conversion start and high at completion; in external clock mode, it pulses high for one SCLK period before the MSB is clocked out on DOUT. This signal enables precise alignment with TMS320-family DSPs and simplifies firmware-driven data capture without polling.
Can the MAX147AEPP operate from a 5V supply, and what are the implications for analog input range?
Yes, the MAX147AEPP supports +2.7V to +5.25V supply voltage, making 5V operation fully valid. With a 2.500V external reference, the unipolar input range is 0V to 2.500V and bipolar range is ±1.250V - independent of VDD. However, analog inputs must stay within AGND −0.3V to VDD +0.3V for protection, and for full-scale accuracy, should not exceed AGND −50mV or VDD +50mV.
MAX147AEPP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX147AEPP FAQ
1.How can I place an order for MAX147AEPP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX147AEPP 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 MAX147AEPP reliable?
The price and inventory of MAX147AEPP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX147AEPP is usually 5 days.
3.What payment methods are accepted for MAX147AEPP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX147AEPP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX147AEPP?
MAX147AEPP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX147AEPP 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 MAX147AEPP?
For technical support, including MAX147AEPP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX147AEPP requirements.
6.How does Aetrix verify that MAX147AEPP is sourced from the original manufacturer or authorized distributors?
All MAX147AEPP 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 MAX147AEPP meets industry standards.
7.What is the process for return or replacement of MAX147AEPP?
All MAX147AEPP units undergo pre-shipment inspection (PSI). If there is an issue with MAX147AEPP, 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 MAX147AEPP part is unused and in its original packaging.
Return procedure for MAX147AEPP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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