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Analog Devices Inc./Maxim Integrated MAX147CCAP
- Part No.:
- MAX147CCAP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX147CCAP.pdf
- Description:
- 8-CHANNEL, SERIAL 12-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:418
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Product details
Overview
MAX147CCAP 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 8-channel multiplexer, high-bandwidth track/hold, and SPI/QSPI/MICROWIRE-compatible 4-wire serial interface. Its external reference architecture supports precision measurement in battery-powered data loggers and portable medical instruments.
For engineers reviewing the MAX147CCAP datasheet, MAX147CCAP pinout, MAX147CCAP application, or MAX147CCAP equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support tailored for low-power embedded ADC selection.
Technical Context
The MAX147CCAP uses successive-approximation (SAR) architecture with integrated track/hold, supporting conversion rates up to 133ksps using an external 2MHz clock or internal clock. Its pseudo-differential input structure enables 4-channel differential or 8-channel single-ended acquisition, with COM pin serving as zero-code reference in single-ended mode.
It requires an external reference voltage applied at VREF (2.500V typical), while REFADJ allows ±1.5% adjustment of the reference buffer gain. The device features three-level SHDN control for full power-down (1µA), fast power-down (54µA at 1ksps), and operational modes, with automatic wake-up on serial interface access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.0244% of full-scale range for precise sensor digitization |
| Conversion Rate | 133ksps - supports real-time sampling of signals up to 65kHz full-power bandwidth |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% absolute linearity error across temperature |
| Supply Range | +2.7V to +5.25V - enables direct interface with 3.3V and 5V microcontrollers without level-shifting |
| Power Consumption | 1.2mA at 133ksps / 54µA at 1ksps - extends battery life in portable instrumentation |
| Reference Input | External 2.500V at VREF pin - decouples accuracy from supply variation; REFADJ enables ±1.5% fine-tuning |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - eliminates glue logic when interfacing with TI C2000 or ARM Cortex-M MCUs |
Pinout & Package
MAX147CCAP is housed in a 20-pin SSOP package (0.154" wide, 0.025" pitch), RoHS-compliant and rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Selectable as 8 single-ended or 4 differential pairs; input protection clamps ±0.3V beyond supplies |
| COM (Pin 9) | Analog ground reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion |
| SHDN (Pin 10) | Three-level shutdown control | Pull low → full power-down (1µA); float → external compensation; pull high → internal compensation |
| VREF (Pin 11) | Reference input/output | Accepts external 2.500V reference; internal buffer disabled by tying REFADJ to VDD |
| REFADJ (Pin 12) | Reference buffer gain adjust | Enables ±1.5% VREF tuning; tie to VDD to disable buffer for external reference use |
| DOUT (Pin 15) | Serial data output | MSB-first, clocked on SCLK falling edge; high-impedance when CS = high |
| AGND (Pin 13), DGND (Pin 14) | Analog/digital ground returns | Separate AGND/DGND pins minimize noise coupling between analog and digital sections |
| SCLK (Pin 19), DIN (Pin 17), CS (Pin 18), SSTRB (Pin 16) | Serial interface control | Supports SPI mode 0 (CPOL=0, CPHA=0); SSTRB provides TMS320-family DSP synchronization pulse |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended/unipolar, single-ended/bipolar, or differential via 8-bit control byte - eliminates hardware rework for signal range changes |
| Low-power adaptive operation | Auto-shutdown after conversion + instant wake-on-CS - reduces average current to <60µA at reduced sampling rates |
| High-accuracy reference path | External VREF input with ±1.5% REFADJ adjustment and 30ppm/°C max drift - maintains 12-bit linearity across industrial temperature range |
| Robust analog input protection | Internal clamp diodes allow safe overvoltage to AGND −0.3V / VDD +0.3V - prevents damage during ESD or miswiring |
| Flexible timing interface | SSTRB strobe synchronized to conversion start/end - enables deterministic DSP interrupt triggering without polling |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure every 10 seconds. IC Role / Device Role / Timing Role: Primary ADC acquiring 8 analog sensor outputs sequentially via multiplexer; external 2.5V reference ensures stable full-scale calibration across battery discharge. Use Value: 54µA quiescent current at 1ksps extends AA battery life to >2 years; SPI interface simplifies firmware integration with low-cost MCU. |
Use Scenario: Handheld ECG monitor digitizing lead-II differential signals with baseline wander correction. IC Role / Device Role / Timing Role: Pseudo-differential ADC sampling CH0/CH1 pair at 1ksps; COM referenced to right-leg drive circuit for common-mode rejection. Use Value: ±0.5 LSB INL preserves diagnostic waveform fidelity; 2.25MHz small-signal bandwidth supports accurate R-wave detection. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
Use Scenario: Pocket-sized multimeter measuring DC voltage, current, and resistance with autoranging. IC Role / Device Role / Timing Role: Configurable unipolar/bipolar input enables seamless range switching; SHDN pin controls power gating per measurement cycle. Use Value: 1.2mA active current at 133ksps supports fast settling for auto-ranging; 20-pin SSOP fits compact PCB layout. |
Use Scenario: DIN-rail mounted PLC analog input module monitoring 4–20mA transmitters and thermocouples. IC Role / Device Role / Timing Role: 8-channel multiplexer scans multiple field sensors; external reference isolates accuracy from noisy 24V supply rails. Use Value: Channel-to-channel offset matching ≤±0.25 LSB minimizes calibration overhead; AGND/DGND separation reduces digital noise coupling. |
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 | 8-channel, 12-bit, SPI interface; 3.3V-only supply (2.7–3.6V); internal reference only; no REFADJ | Requires external reference buffer for 5V systems; lacks bipolar input mode and SSTRB strobe | Prefer MAX147CCAP when 5V compatibility, external reference flexibility, or TMS320 synchronization is required |
| MAX11131ETE+ | 8-channel, 12-bit, SPI interface; 2.7–3.6V supply; internal 2.048V reference; 1MSPS max rate | Higher speed but narrower supply range; no external reference option or COM pin for pseudo-differential zero-reference | Choose MAX147CCAP for dual-supply (3.3V/5V) designs needing adjustable reference and robust low-power shutdown |
Compared with ADS7822U and MAX11131ETE+, the MAX147CCAP uniquely combines 5.25V supply tolerance, external reference configurability with REFADJ, and SSTRB-based DSP synchronization-making it optimal for portable, battery-constrained, or mixed-voltage industrial systems requiring field-calibratable precision.
Availability
MAX147CCAP is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply and long-term manufacturing continuity.
Supply support for MAX147CCAP 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 leader in precision analog, mixed-signal, and high-reliability semiconductor solutions for industrial, medical, and automotive markets.
The MAX146/MAX147 family was designed specifically for low-power, multi-channel data acquisition in space- and energy-constrained portable systems-emphasizing flexible input configuration, minimal external components, and seamless microcontroller integration.
FAQ
What is the reference voltage requirement for MAX147CCAP?
The MAX147CCAP requires an external reference voltage applied to the VREF pin, typically 2.500V. Unlike the MAX146, it does not include an internal reference. The REFADJ pin allows ±1.5% adjustment of the reference buffer gain, and tying REFADJ to VDD disables the buffer for direct external reference use. This architecture ensures high accuracy independent of VDD variation.
Does MAX147CCAP support differential input measurements?
Yes, the MAX147CCAP supports true pseudo-differential measurements across four channel pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. In differential mode, the device samples the voltage difference while maintaining COM as a stable reference point. The input structure requires the negative input (IN−) to remain stable within ±0.5 LSB relative to AGND during conversion, achieved using local 0.1µF bypassing.
How does the SHDN pin function on MAX147CCAP?
The SHDN pin on MAX147CCAP provides three-level control: pulled low → full power-down (1µA); left floating → external compensation mode for reference buffer; pulled high → internal compensation mode. This enables precise power-state management without external logic. Accessing the serial interface automatically wakes the device, and quick turn-on time allows shutdown between conversions to reduce average supply current below 60µA.
What serial interface protocols is MAX147CCAP compatible with?
The MAX147CCAP supports SPI, QSPI, and MICROWIRE protocols via its 4-wire serial interface (CS, SCLK, DIN, DOUT). It operates in SPI Mode 0 (CPOL = 0, CPHA = 0) and includes SSTRB for direct connection to TMS320-family DSPs. No external level shifters or glue logic are needed-enabling plug-and-play integration with common microcontrollers and digital signal processors.
What is the maximum sampling rate achievable with MAX147CCAP?
The MAX147CCAP achieves a maximum sampling rate of 133ksps using a 2MHz external serial clock, with 15 clock cycles per conversion. Its internal clock mode supports lower rates with reduced external component count. The 65kHz full-power bandwidth and 2.25MHz small-signal bandwidth allow accurate digitization of transient events and undersampling of higher-frequency signals when paired with appropriate anti-alias filtering.
MAX147CCAP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 133k
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- 4-Wire Serial, DSP, Microwire, QSPI, 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:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX147CCAP FAQ
1.How can I place an order for MAX147CCAP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX147CCAP 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 MAX147CCAP reliable?
The price and inventory of MAX147CCAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX147CCAP is usually 5 days.
3.What payment methods are accepted for MAX147CCAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX147CCAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX147CCAP?
MAX147CCAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX147CCAP 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 MAX147CCAP?
For technical support, including MAX147CCAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX147CCAP requirements.
6.How does Aetrix verify that MAX147CCAP is sourced from the original manufacturer or authorized distributors?
All MAX147CCAP 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 MAX147CCAP meets industry standards.
7.What is the process for return or replacement of MAX147CCAP?
All MAX147CCAP units undergo pre-shipment inspection (PSI). If there is an issue with MAX147CCAP, 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 MAX147CCAP part is unused and in its original packaging.
Return procedure for MAX147CCAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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