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Analog Devices Inc./Maxim Integrated MAX146BEAP+T
- Part No.:
- MAX146BEAP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX146BEAP+T.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,899
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Product details
Overview
MAX146BEAP+T from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.7V to +3.6V supply, consumes 1.2mA at 133ksps, and supports software-configurable unipolar/bipolar and single-ended/differential inputs. It is used in portable data loggers and battery-powered medical instruments where low power and compact signal acquisition are critical.
For engineers reviewing the MAX146BEAP+T datasheet, MAX146BEAP+T pinout, MAX146BEAP+T application, or MAX146BEAP+T equivalent, key selection considerations include its internal reference accuracy (±0.5% initial, ±30ppm/°C drift), 1.5µs acquisition time, shutdown current of 1µA, and SSOP-20 package compatibility with space-constrained embedded systems.
Technical Context
The MAX146BEAP+T employs successive-approximation register (SAR) architecture with an integrated track/hold circuit that acquires input signals within 1.5µs and supports up to 133ksps conversion rate using an external 2MHz clock. Its analog front-end allows pseudo-differential sampling across eight single-ended or four differential input pairs (CH0/CH1 through CH6/CH7), with COM pin serving as the zero-code reference in single-ended mode.
It features dual clocking modes - internal or external serial clock - and uses an 8-bit control byte to configure channel selection, input polarity, and power-down state. The device includes a three-level SHDN pin for hardware shutdown, reference buffer enable/disable via REFADJ, and SSTRB strobe output synchronized to conversion start/end for TMS320-family DSP interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC - delivers 1 LSB = 610µV full-scale step size with 2.5V reference. |
| Sampling Rate | 133ksps max - achieved with 2MHz external clock and 15-clock conversion cycle. |
| Supply Voltage | +2.7V to +3.6V - enables direct operation from single Li-ion or 3.3V rail without LDO. |
| Reference | Internal 2.500V ±0.5% (25°C), ±30ppm/°C TC - eliminates need for external precision reference. |
| Power Consumption | 1.2mA active (133ksps), 54µA at 1ksps, 1µA in power-down - extends battery life in portable devices. |
| INL / DNL | ±0.5 LSB integral nonlinearity, ±0.5 LSB differential nonlinearity - ensures monotonicity and <0.012% measurement error. |
| Input Configuration | 8-channel single-ended or 4-channel differential - configurable via 8-bit control word with SEL2–SEL0 and SGL/DIF bits. |
Pinout & Package
MAX146BEAP+T is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, JEDEC MO-153 compliant, footprint compatible with MAX146BCAP and MAX146ACAP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Eight single-ended inputs; paired as CH0/CH1, CH2/CH3, etc., for pseudo-differential operation. |
| COM (Pin 9) | Analog common reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5LSB during conversion. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low → full shutdown; pull high → internal compensation; float → external compensation mode. |
| VREF (Pin 11) | Reference buffer output / ADC reference input | 2.500V nominal output (MAX146 only); bypassed with 4.7µF capacitor in internal mode. |
| REFADJ (Pin 12) | Reference buffer adjustment input | ±1.5% voltage-adjustment range; tie to VDD to disable internal reference buffer. |
| DOUT (Pin 15) | Serial data output | MSB-first, clocked on SCLK falling edge; high-impedance when CS = high. |
| AGND / DGND (Pins 13, 14) | Analog and digital ground | Separate AGND/DGND pins required for noise isolation; must be connected at single point. |
| CS (Pin 18) | Active-low chip select | Enables serial interface; DOUT enters high-Z state when CS is high. |
| SCLK (Pin 19) | Serial clock input | Drives data I/O and (in external mode) sets conversion speed; 40–60% duty cycle required. |
| VDD (Pin 20) | Positive supply | +2.7V to +3.6V operation; powers analog and digital sections from single rail. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Eliminates external reference IC and reduces BOM count; ±0.5% initial accuracy supports calibration-free designs. |
| Software-configurable input mode | Single control byte selects unipolar/bipolar and single-ended/differential operation - no hardware changes needed per sensor type. |
| Low-power shutdown | 1µA shutdown current and automatic power-down after conversion enable µA-level average current in intermittent-sampling systems. |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to microcontrollers without level shifters or glue logic; CPOL=0/CPHA=0 configuration required. |
| Serial strobe output (SSTRB) | Provides precise timing marker for conversion start/end - simplifies synchronization with TMS320 DSPs and real-time firmware. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over days. IC Role / Device Role / Timing Role: Primary ADC acquiring 8 analog sensor outputs sequentially with 12-bit resolution and internal reference stability. Use Value: 1.2mA active current and 1µA shutdown extend battery life beyond 6 months; SSOP-20 footprint fits compact PCB layouts. |
Use Scenario: Handheld ECG monitor digitizing lead-II differential signals with low-noise front-end. IC Role / Device Role / Timing Role: Pseudo-differential ADC sampling CH0/CH1 pair at 1ksps with bipolar input range (±1.25V). Use Value: ±0.5 LSB INL ensures clinical-grade amplitude accuracy; separate AGND/DGND pins minimize digital noise coupling. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
|
Use Scenario: Pocket-sized multimeter measuring DC voltage, current, and resistance with auto-ranging. IC Role / Device Role / Timing Role: Configurable ADC supporting unipolar 0–2.5V and bipolar ±1.25V ranges via software control byte. Use Value: Single-supply +2.7V operation eliminates negative rail; internal reference removes calibration dependency on external components. |
Use Scenario: DIN-rail mounted PLC analog input module monitoring 4–20mA transmitters and thermocouples. IC Role / Device Role / Timing Role: 8-channel multiplexed ADC scanning multiple field sensors with programmable acquisition timing. Use Value: 1.5µs acquisition time supports fast transient capture; REFADJ pin enables fine-tuning for system-level gain calibration. |
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, +2.7V to +5.25V supply, no internal reference - requires external 2.5V reference. | Higher sampling rate but lacks integrated reference; better suited for systems already using precision external references. | Select ADS7822U when >133ksps is required and reference architecture is centralized across multiple ADCs. |
| MAX11131ETE+ | 12-bit, 500ksps, internal reference (2.048V), SPI-only interface, 16-pin TQFN - smaller package, higher speed. | Higher throughput and smaller footprint, but lacks SSTRB strobe and REFADJ adjustability. | Choose MAX11131ETE+ for space-constrained, high-speed applications where strobe timing and reference tuning are not required. |
Compared with ADS7822U and MAX11131ETE+, the MAX146BEAP+T offers unique value in low-power portable systems requiring internal reference stability, flexible input configuration, and hardware-synced conversion timing - all in a mature, widely supported SSOP-20 package.
Availability
MAX146BEAP+T is available at Aetrix Electronics and suitable for portable data logging, battery-powered medical instrumentation, and industrial process monitoring requiring stable component supply and long-term production continuity.
Supply support for MAX146BEAP+T 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 applications.
The MAX146BEAP+T belongs to Maxim's precision data-acquisition product line, designed specifically for low-power, multi-channel, single-supply embedded systems where integration, reliability, and ease of interface are prioritized over raw speed.
FAQ
What is the operating temperature range for MAX146BEAP+T?
The MAX146BEAP+T is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade rating aligns with its BEAP+T ordering suffix and matches the MAX146BCAP and MAX146ACAP variants. It is not rated for extended industrial (-40°C to +85°C) or military temperature ranges.
Does MAX146BEAP+T require an external reference voltage?
No, the MAX146BEAP+T includes an internal 2.500V reference with ±0.5% initial accuracy and ±30ppm/°C temperature coefficient. External reference is optional and only needed if higher precision or different voltage levels are required - in which case REFADJ must be tied to VDD to disable the internal buffer.
How does the SHDN pin function on MAX146BEAP+T?
The SHDN pin on MAX146BEAP+T supports three states: pulled low → full shutdown (1µA current); pulled high → internal compensation mode (4.7µF at VREF); floating → external compensation mode (0.047µF at REFADJ). This flexibility allows optimized reference stability across varying load conditions without external component changes.
Can MAX146BEAP+T perform differential measurements?
Yes, MAX146BEAP+T supports 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 the stable return reference - requiring <±0.5LSB stability on the IN– input during conversion.
What serial interface protocols does MAX146BEAP+T support?
MAX146BEAP+T supports SPI, QSPI, and MICROWIRE protocols via its 4-wire interface (CS, SCLK, DIN, DOUT). For SPI compatibility, configure master mode with CPOL = 0 and CPHA = 0. The SSTRB strobe output further enables tight synchronization with TMS320-family DSPs in real-time signal processing applications.
MAX146BEAP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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 ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX146BEAP+T FAQ
1.How can I place an order for MAX146BEAP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX146BEAP+T 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 MAX146BEAP+T reliable?
The price and inventory of MAX146BEAP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX146BEAP+T is usually 5 days.
3.What payment methods are accepted for MAX146BEAP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX146BEAP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX146BEAP+T?
MAX146BEAP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX146BEAP+T 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 MAX146BEAP+T?
For technical support, including MAX146BEAP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX146BEAP+T requirements.
6.How does Aetrix verify that MAX146BEAP+T is sourced from the original manufacturer or authorized distributors?
All MAX146BEAP+T 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 MAX146BEAP+T meets industry standards.
7.What is the process for return or replacement of MAX146BEAP+T?
All MAX146BEAP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX146BEAP+T, 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 MAX146BEAP+T part is unused and in its original packaging.
Return procedure for MAX146BEAP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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