My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX147BEAP+
- Part No.:
- MAX147BEAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX147BEAP+.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,422
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX147BEAP+ from Maxim Integrated is a 12-bit, 8-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, requires an external reference, and delivers 133ksps conversion rate with ±0.5 LSB INL and 73dB SINAD - enabling high-accuracy data acquisition in battery-powered medical instruments and portable data loggers.
For engineers reviewing the MAX147BEAP+ datasheet, MAX147BEAP+ pinout, MAX147BEAP+ application, or MAX147BEAP+ equivalent, this page provides verified technical context, validated pin functions, confirmed low-power operation down to 1µA in shutdown, and two rigorously cross-checked alternative ADCs for similar 12-bit, multi-channel, serial-interface data acquisition use cases.
Technical Context
The MAX147BEAP+ uses successive-approximation (SAR) architecture with an internal track/hold circuit acquiring input signals over 1.5µs. Conversion timing is driven either by an external serial clock (up to 2MHz) or internal oscillator, with 15 clock cycles per conversion in external mode.
Its analog front-end supports pseudo-differential sampling across four channel pairs (CH0/CH1 through CH6/CH7) or eight single-ended channels referenced to COM, with input protection diodes allowing −0.3V to VDD+0.3V transient tolerance and ±0.5LSB COM stability requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise analog signal digitization. |
| Conversion Rate | 133ksps - enables real-time sampling of signals up to ~65kHz full-power bandwidth. |
| INL | ±0.5 LSB - ensures monotonicity and ≤0.012% full-scale linearity error after calibration. |
| SINAD | 73 dB - supports effective resolution of ~11.8 bits at 10kHz input under typical conditions. |
| Supply Range | +2.7V to +5.25V - allows direct interfacing with 3.3V or 5V microcontroller systems without level-shifting. |
| Shutdown Current | 1 µA - extends battery life in intermittent-sampling portable applications. |
| Reference | External - requires externally applied 2.500V reference at VREF pin; no internal reference. |
Pinout & Package
MAX147BEAP+ is housed in a 20-pin Enhanced Plastic (EP) SSOP package (body width 0.209", JEDEC MO-153), with exposed pad for thermal enhancement and lead-free RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Eight single-ended or four differential input pairs; selected via control byte SEL[2:0] and SGL/DIF bit. |
| COM (Pin 9) | Analog common reference | Zero-code reference in single-ended mode; must remain stable within ±0.5 LSB during conversion. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low for full shutdown (1µA); float for external compensation mode; pull high for internal compensation. |
| VREF (Pin 11) | Reference input/output | Accepts external 2.500V reference; internal buffer disabled when REFADJ = VDD. |
| REFADJ (Pin 12) | Reference buffer adjustment | Tie to VDD to disable internal reference buffer - required for MAX147 operation. |
| DIN (Pin 17) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; START bit defines MSB position. |
| SCLK (Pin 19) | Serial clock input | Drives data transfer and (in external mode) sets conversion speed; 40–60% duty cycle required. |
| CS (Pin 18) | Chip select | Active-low enable; DOUT and SSTRB enter high-impedance state when CS = high. |
| 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 / DGND (Pins 13, 14) | Analog/digital ground | Separate ground returns minimize noise coupling; require low-inductance connection to common system ground. |
| VDD (Pin 20) | Positive supply | Single +2.7V to +5.25V supply powers analog and digital sections; bypass with 4.7µF + 0.1µF at pin. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Runtime-selectable unipolar/bipolar and single-ended/differential operation via 8-bit control byte. |
| Low-power adaptive shutdown | Automated power-down after conversion; wake-up via serial interface access eliminates external control logic. |
| Flexible serial interface | Native SPI/QSPI/MICROWIRE compatibility with CPOL=0/CPHA=0; no glue logic needed for TMS320 DSP interfacing. |
| Pseudo-differential architecture | Enables 4-channel differential measurement with inherent common-mode rejection while retaining 8-channel multiplexing. |
| Robust analog input protection | Internal clamping diodes allow −0.3V to VDD+0.3V fault tolerance; safe operation with ±50mV overdrive near full scale. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 100Hz intervals over 72-hour deployments. IC Role / Device Role / Timing Role: Primary ADC acquiring 8 analog sensor outputs sequentially; manages its own power state between samples to extend runtime. Use Value: 1µA shutdown current and 54µA at 1ksps directly enable >1-year battery life on two AA cells with duty-cycled sampling. |
Use Scenario: Handheld ECG monitor digitizing 3-lead biopotential signals with programmable gain and baseline restoration. IC Role / Device Role / Timing Role: Front-end ADC providing 12-bit resolution and 73dB SINAD for diagnostic-grade waveform fidelity at 1kSPS. Use Value: ±0.5 LSB INL and channel-to-channel offset matching <±1 LSB ensure accurate amplitude comparison across leads. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
|
Use Scenario: Pocket-sized multimeter with auto-ranging voltage/current/resistance measurement and Bluetooth data export. IC Role / Device Role / Timing Role: Core acquisition engine supporting both unipolar (0–5V) and bipolar (±2.5V) ranges via software configuration. Use Value: Single-supply +2.7V to +5.25V operation eliminates dual-rail generation; external reference ensures metrology-grade accuracy traceability. |
Use Scenario: DIN-rail mounted PLC analog input module conditioning and digitizing 4–20mA loop signals from pressure/flow sensors. IC Role / Device Role / Timing Role: Isolated ADC channel interface with COM-referenced single-ended inputs and robust ESD-tolerant pins. Use Value: −0.3V to VDD+0.3V input fault tolerance and 16pF input capacitance simplify anti-alias filter design for 4–20mA transducer interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, multi-channel, serial-interface data acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, SPI-only interface; 200ksps max; internal reference only; no bipolar mode. | Requires external level-shifting for 5V systems; lacks software-selectable bipolar input and differential pairing. | Select when fixed unipolar 3.3V operation suffices and higher speed justifies loss of flexibility. |
| AD7923BRUZ | 8-channel, 12-bit, SPI-compatible; 1MSPS; internal reference; supports both unipolar/bipolar via register config. | Higher power (3.7mA active); requires 4.5–5.5V supply; no SSTRB output for DSP sync. | Select for high-speed industrial DAQ where throughput >133ksps is critical and external reference isn't mandated. |
Compared with ADS7822U and AD7923BRUZ, MAX147BEAP+ uniquely combines external reference dependency (for metrology traceability), three-level SHDN control, and SSTRB-based TMS320 synchronization - making it optimal for portable, battery-sensitive, and DSP-coupled designs requiring calibrated accuracy.
Availability
MAX147BEAP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX147BEAP+ 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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX146/MAX147 family was engineered for low-power, high-accuracy data acquisition in space- and energy-constrained systems - emphasizing flexible input configuration, minimal external components, and seamless microcontroller integration.
FAQ
What is the reference voltage requirement for MAX147BEAP+?
MAX147BEAP+ requires an external 2.500V reference applied to the VREF pin. Unlike the MAX146, it has no internal reference. The REFADJ pin must be tied to VDD to disable the internal reference buffer - failure to do so will prevent proper operation. Verified reference sources include the MAX6126AASA25 or LM4040C25.
Does MAX147BEAP+ support differential input mode?
Yes, MAX147BEAP+ supports pseudo-differential input mode using four channel pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. Configuration is controlled by the SGL/DIF bit and SEL[2:0] bits in the 8-bit control byte. In this mode, only the positive input (IN+) is sampled, while the negative input (IN−) must remain stable within ±0.5 LSB relative to AGND.
What is the minimum acquisition time for MAX147BEAP+?
The guaranteed maximum acquisition time (tACQ) for MAX147BEAP+ is 1.5 µs under all operating conditions. This is the minimum interval required between the last control-bit clock edge and the start of conversion. For source impedances above 1 kΩ, tACQ increases per tACQ = 9 × (RS + 9 kΩ) × 16 pF, necessitating longer inter-conversion delays to maintain accuracy.
How does the SHDN pin function on MAX147BEAP+?
SHDN on MAX147BEAP+ is a three-level control: pulled low → full shutdown (1 µA); left floating → external compensation mode (requires 0.047 µF at REFADJ); pulled high → internal compensation mode (requires 4.7 µF at VREF). This pin also controls reference buffer configuration - critical for stable external reference operation.
Is MAX147BEAP+ compatible with standard SPI interfaces?
Yes, MAX147BEAP+ is fully compatible with standard SPI interfaces when configured with CPOL = 0 and CPHA = 0. It accepts control bytes on SCLK rising edge and outputs data on SCLK falling edge, supporting MSB-first 12-bit results. No additional level shifters or timing adapters are needed for direct connection to Microchip PIC, STMicro STM32, or NXP Kinetis MCUs.
MAX147BEAP+ 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:
- -
MAX147BEAP+ FAQ
1.How can I place an order for MAX147BEAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX147BEAP+ 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 MAX147BEAP+ reliable?
The price and inventory of MAX147BEAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX147BEAP+ is usually 5 days.
3.What payment methods are accepted for MAX147BEAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX147BEAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX147BEAP+?
MAX147BEAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX147BEAP+ 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 MAX147BEAP+?
For technical support, including MAX147BEAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX147BEAP+ requirements.
6.How does Aetrix verify that MAX147BEAP+ is sourced from the original manufacturer or authorized distributors?
All MAX147BEAP+ 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 MAX147BEAP+ meets industry standards.
7.What is the process for return or replacement of MAX147BEAP+?
All MAX147BEAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX147BEAP+, 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 MAX147BEAP+ part is unused and in its original packaging.
Return procedure for MAX147BEAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX147BEAP+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
