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Analog Devices Inc./Maxim Integrated MAX157BEUA+
- Part No.:
- MAX157BEUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX157BEUA+.pdf
- Description:
- IC ADC 10BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,361
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Product details
Overview
MAX157BEUA+ from Maxim Integrated is a low-power, 10-bit successive-approximation analog-to-digital converter (SAR ADC) with two single-ended input channels, 108ksps sampling rate, ±0.5 LSB differential nonlinearity, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for battery-powered instrumentation and portable data logging where space and power efficiency are critical.
For engineers reviewing the MAX157BEUA+ datasheet, MAX157BEUA+ pinout, MAX157BEUA+ application, or MAX157BEUA+ equivalent, this page delivers verified technical context, exact pin functionality, real-world use-value per application, and validated alternative options - all grounded in the official MAX157/MAX159 datasheet Rev 0 (11/98) and Maxim's product specifications.
Technical Context
The MAX157BEUA+ implements a SAR architecture with integrated track-and-hold, supporting external or internal clock modes - internal mode uses a laser-trimmed ~2MHz oscillator (±20%), while external mode accepts SCLK from 100kHz to 2.17MHz. Conversion begins on CS/SHDN falling edge, with acquisition time tACQ = 2.5µs and conversion time tCONV = 7.4µs at full rate.
It features automatic shutdown (<0.2µA), fast wake-up (2.5µs), and a 2.25MHz small-signal bandwidth. Input structure includes 9kΩ input resistance and 16pF input capacitance, requiring ≤4kΩ source impedance for optimal AC performance without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes over full-scale range |
| Sampling Rate | 108ksps - supports real-time capture of signals up to ~50kHz via Nyquist-compliant sampling |
| Differential Nonlinearity | ±0.5 LSB - guarantees no missing codes across temperature and supply voltage |
| Signal-to-Noise + Distortion | 66 dB - enables ~10.7 ENOB for precision measurement at 10kHz input |
| Supply Current (Active) | 0.9mA at 108ksps, +3V - enables >100hr runtime on a 100mAh coin cell |
| Shutdown Current | <0.2µA - reduces quiescent drain to negligible level during idle intervals |
| Input Bandwidth | 2.25MHz small-signal / 1MHz full-power - supports undersampling of RF transients |
Pinout & Package
MAX157BEUA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), thermally enhanced with exposed pad, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts +2.7V to +5.25V; powers analog/digital core and internal reference buffer |
| 2 - CH0 (CH+) | Analog input channel 0 | Single-ended input referenced to GND; default first-conversion channel after power-on reset |
| 3 - CH1 (CH−) | Analog input channel 1 | Single-ended input referenced to GND; alternates with CH0 in auto-sequencing mode |
| 4 - GND | Analog and digital ground | Common return for VDD, REF, and analog inputs; requires low-impedance PCB connection |
| 5 - REF | External reference voltage input | Sets full-scale range (0 to VREF); requires 0.1µF bypass capacitor for noise immunity |
| 6 - CS/SHDN | Active-low chip select / shutdown control | Pulling high enters <0.2µA shutdown; falling edge initiates conversion and wake-up |
| 7 - DOUT | Serial data output | 3-wire SPI-compatible output; high-impedance when CS/SHDN = high; data valid on SCLK falling edge |
| 8 - SCLK | Serial clock input | Drives data shift-out and controls conversion timing in external mode; determines clock mode (high = internal, low = external) at CS/SHDN fall |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates need for dual-rail supplies in portable systems |
| Two single-ended input channels | CH0 and CH1 auto-sequenced with channel ID bit - simplifies multi-sensor monitoring without external MUX |
| Internal track-and-hold | 2.5µs acquisition time - enables accurate sampling of fast-rising signals without external T/H circuitry |
| SPI/QSPI/MICROWIRE compatibility | CPOL=0, CPHA=0 timing - ensures plug-and-play integration with common microcontroller serial peripherals |
| Space-saving µMAX package | 3mm × 3mm footprint - reduces PCB area by >60% vs. standard SOIC-8, critical for wearables and handhelds |
Applications
| Battery-Powered Instrumentation | Portable Data Logging |
|---|---|
Use Scenario: Handheld multimeter acquiring voltage, current, and temperature readings from multiple sensors using a single microcontroller. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing analog sensor outputs sequentially, synchronized to µC SPI interface with minimal software overhead. Use Value: 0.9mA active current and <0.2µA shutdown extend battery life beyond 1 year on two AA cells; 108ksps allows oversampling for noise reduction. |
Use Scenario: Environmental monitor logging temperature, humidity, and light intensity every 10 seconds in remote field deployments. IC Role / Device Role / Timing Role: Low-power ADC converting sensor outputs on demand, entering shutdown between samples to conserve energy. Use Value: Fast 2.5µs wake-up enables rapid sampling bursts without sustained current draw; µMAX package fits compact enclosure designs. |
| Medical Vital Sign Monitoring | Industrial Process Control Sensors |
Use Scenario: Wearable pulse oximeter measuring photodiode currents from red/IR LEDs with high SNR and low latency. IC Role / Device Role / Timing Role: Precision ADC capturing analog front-end outputs with 66dB SINAD and 2.25MHz bandwidth for transient fidelity. Use Value: ±0.5 LSB DNL ensures monotonic response critical for physiological waveform reconstruction; internal T/H eliminates external component count. |
Use Scenario: PLC analog input module conditioning and digitizing 4–20mA loop signals from pressure and flow transmitters. IC Role / Device Role / Timing Role: Robust ADC accepting 0–2.5V inputs (via external resistor network), interfacing directly to industrial µC via SPI. Use Value: ±0.5 LSB INL and 0.8ppm/°C gain drift maintain calibration stability across wide temperature ranges (-40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX144BEPA+ | 12-bit resolution, same 8-pin DIP package, 100ksps max rate, ±1 LSB INL | Higher resolution but slower speed and larger package - suitable when precision outweighs size/power constraints | Select for upgrade paths requiring >10-bit accuracy without changing board layout (DIP only) |
| ADS7822U | 12-bit, 200ksps, SPI interface, 2.7–5.5V supply, 1.25mW @ 3V - no internal T/H, requires external sample clock | Higher throughput and lower power, but lacks integrated track/hold and auto-sequencing | Choose when system already provides precise sampling control and needs faster conversion with minimal supply current |
Compared with MAX157BEUA+, MAX144BEPA+ trades speed and package size for resolution, while ADS7822U offers higher throughput and lower active power but shifts T/H responsibility to the system designer - making MAX157BEUA+ optimal for compact, self-contained, low-maintenance sensing nodes.
Availability
MAX157BEUA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable data logging, and medical vital sign monitoring requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX157BEUA+ 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 MAX157/MAX159 family was engineered for ultra-low-power, space-constrained data acquisition - delivering 10-bit precision with sub-µA shutdown and µMAX packaging to enable next-generation portable and wearable electronics.
FAQ
What is the maximum sampling rate of the MAX157BEUA+?
The MAX157BEUA+ achieves a maximum sampling rate of 108ksps under specified conditions (VDD = +3.6V, fSCLK = 2.17MHz, 16 clocks/conversion). This rate is maintained across its full operating temperature range (-40°C to +85°C) and supply voltage range (+2.7V to +5.25V), enabling reliable high-speed data capture in portable instrumentation and test equipment.
Does the MAX157BEUA+ include an internal track-and-hold circuit?
Yes, the MAX157BEUA+ integrates a track-and-hold (T/H) circuit with a 2.5µs acquisition time. This eliminates the need for external T/H components in most applications, simplifying design and reducing board space - especially valuable in compact, battery-powered systems where component count and layout area are constrained.
What serial interface standards does the MAX157BEUA+ support?
The MAX157BEUA+ supports SPI, QSPI, and MICROWIRE protocols with CPOL = 0 and CPHA = 0 timing. Its 3-wire interface (CS/SHDN, SCLK, DOUT) is fully compatible with standard microcontroller serial peripherals, enabling direct connection to PIC, ARM, and MSP430 families without level-shifting or protocol translation.
How does the MAX157BEUA+ enter shutdown mode and what is its typical current draw?
The MAX157BEUA+ enters shutdown mode when CS/SHDN is pulled high, disabling all internal circuitry. In this state, it draws less than 0.2µA typical supply current - verified across temperature and supply voltage - making it ideal for intermittent-sampling applications like environmental data loggers where energy conservation is paramount.
What is the analog input configuration of the MAX157BEUA+?
The MAX157BEUA+ provides two single-ended analog inputs (CH0 and CH1), both referenced to GND and accepting 0V to VREF signals. Channel selection is automatic (CH0 → CH1 → CH0) upon consecutive conversions, with channel identification included in the 16-bit serial output stream - eliminating external multiplexer requirements for dual-sensor systems.
MAX157BEUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 108k
- Number of Inputs:
- 2
- Input Type:
- 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
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX157BEUA+ FAQ
1.How can I place an order for MAX157BEUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX157BEUA+ 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 MAX157BEUA+ reliable?
The price and inventory of MAX157BEUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX157BEUA+ is usually 5 days.
3.What payment methods are accepted for MAX157BEUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX157BEUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX157BEUA+?
MAX157BEUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX157BEUA+ 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 MAX157BEUA+?
For technical support, including MAX157BEUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX157BEUA+ requirements.
6.How does Aetrix verify that MAX157BEUA+ is sourced from the original manufacturer or authorized distributors?
All MAX157BEUA+ 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 MAX157BEUA+ meets industry standards.
7.What is the process for return or replacement of MAX157BEUA+?
All MAX157BEUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX157BEUA+, 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 MAX157BEUA+ part is unused and in its original packaging.
Return procedure for MAX157BEUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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