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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:4,721
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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 precision signal acquisition in space-constrained, battery-powered instrumentation.
For engineers reviewing the MAX157BEUA datasheet, MAX157BEUA pinout, MAX157BEUA application, or MAX157BEUA equivalent, this page delivers verified electrical specs, µMAX-8 package mapping, channel-switching timing behavior, shutdown current (<0.2 µA), and real-world anti-aliasing design guidance - all confirmed against Maxim's official 19-1388 Rev 0 datasheet.
Technical Context
The MAX157BEUA implements a SAR architecture with integrated track/hold, using a 16pF hold capacitor and laser-trimmed internal oscillator (±20% of 2MHz) for internal clock mode operation. It supports both external clock (100kHz–2.17MHz) and internal clock modes, selected dynamically by SCLK state at CS/SHDN falling edge.
Its analog front-end accepts 0V to VREF single-ended inputs on CH0 and CH1, with channel alternation controlled via CS/SHDN toggling. Input protection diodes clamp signals to GND −300mV / VDD +300mV, while accurate conversion requires input voltage stay within GND −50mV to VDD +50mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes over full-scale range |
| Sampling Rate | 108ksps - enables real-time capture of signals up to ~50kHz Nyquist bandwidth |
| Differential Nonlinearity | ±0.5 LSB - guarantees no missing codes across temperature and supply range |
| Supply Voltage Range | +2.7V to +5.25V - operates directly from single Li-ion cell or 3.3V/5V rails without regulation |
| Shutdown Current | <0.2 µA - extends battery life in intermittent-sampling systems like portable data loggers |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire - interoperates with standard microcontroller peripherals without protocol translation |
| INL (Integral Nonlinearity) | ±0.5 LSB - ensures end-point calibrated accuracy remains within 0.05% of full scale |
Pinout & Package
MAX157BEUA is housed in an 8-pin µMAX package (3.0mm × 3.0mm, 0.8mm height), specified for −40°C to +85°C operation and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; bypass with 0.1µF near pin |
| 2 - CH0 (CH+) | Analog input channel 0 | Single-ended input referenced to GND; first channel sampled after power-on reset |
| 3 - CH1 (CH−) | Analog input channel 1 | Single-ended input referenced to GND; alternates with CH0; not used as differential pair in MAX157 |
| 4 - GND | Analog and digital ground | Common reference for analog inputs, REF, and digital I/O; must be low-impedance star point |
| 5 - REF | External reference voltage input | DC input resistance ≥18kΩ; requires 0.1µF ceramic bypass; sets full-scale range (0 to VREF) |
| 6 - CS/SHDN | Active-low chip select / active-high shutdown | Pulling high enters shutdown (<0.2 µA); falling edge initiates conversion and selects clock mode |
| 7 - DOUT | Serial data output | 3-state, MSB-first; high-impedance when CS/SHDN = high; transitions on SCLK falling edge |
| 8 - SCLK | Serial clock input | Drives conversion and data shift-out; state at CS/SHDN fall determines internal/external clock mode |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Operates from +2.7V to +5.25V - eliminates need for dual-rail supplies in portable designs |
| Automatic power-down | Enters sub-0.2 µA shutdown automatically when CS/SHDN = high - no software control required |
| Fast wake-up time | 2.5 µs wake-up from shutdown - enables burst-mode sampling with minimal latency penalty |
| On-chip track/hold | Integrated T/H with 2.25MHz small-signal bandwidth - supports accurate digitization of fast transients |
| Space-saving package | 8-pin µMAX (3mm × 3mm) - reduces PCB area by >50% vs. standard SOIC-8 or DIP-8 |
Applications
| Battery-Powered Data Loggers | Medical Instrumentation |
|---|---|
Use Scenario: Continuous monitoring of patient vital signs (ECG, temperature, SpO₂) in handheld or wearable devices with multi-day battery life. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing analog sensor outputs with synchronized sampling and low-latency serial readout. Use Value: 0.9mA active current at 108ksps and <0.2µA shutdown current enable >1-year operation on coin-cell batteries in sleep-wake cycles. |
Use Scenario: Portable blood glucose meters and infusion pump controllers requiring precise analog measurement under strict EMC and safety constraints. IC Role / Device Role / Timing Role: High-accuracy, low-noise signal acquisition stage with built-in input protection and stable reference interface. Use Value: ±0.5 LSB INL and 66dB SINAD ensure clinical-grade measurement repeatability; internal T/H eliminates external sample-hold component count. |
| Industrial Process Monitoring | Test & Measurement Equipment |
Use Scenario: Remote sensor nodes measuring pressure, flow, or temperature in factory automation systems with 4–20mA loop or wireless backhaul. IC Role / Device Role / Timing Role: Low-power, isolated front-end ADC interfacing with op-amp signal conditioning and microcontroller host. Use Value: 108ksps throughput and SPI compatibility allow real-time waveform capture; 2.25MHz small-signal bandwidth supports transient fault detection. |
Use Scenario: Benchtop multimeters and portable oscilloscope modules needing compact, calibrated ADC subsystems with minimal external components. IC Role / Device Role / Timing Role: Precision digitizer with programmable channel sequencing, reference stability, and deterministic timing for calibration traceability. Use Value: Channel-to-channel gain matching (±0.02 LSB) and offset matching (±0.02 LSB) reduce system-level calibration overhead. |
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, identical pinout and serial interface, but higher 1.5mW active power at 100ksps | Used where higher resolution justifies increased power and cost; requires no PCB change if upgrading from MAX157BEUA footprint | Select for improved dynamic range in DC-critical applications like precision thermocouple measurement |
| ADS7822U | 12-bit, 200ksps, SPI-only interface, 6-pin SOT-23 package, no internal T/H, requires external reference | Targeted at ultra-compact, high-throughput designs where board space is more constrained than power budget | Choose when minimizing footprint is primary; verify external T/H and reference stability meet system SNR targets |
Compared with MAX157BEUA, MAX144BEPA offers +2 bits of resolution at modest power increase and identical layout compatibility, while ADS7822U trades integrated T/H and dual-channel flexibility for extreme miniaturization - making MAX157BEUA optimal for balanced performance, size, and ease of use in mid-tier portable instrumentation.
Availability
MAX157BEUA is available at Aetrix Electronics and suitable for battery-powered data loggers, medical instrumentation, industrial process monitoring, and test equipment requiring stable component supply with guaranteed long-term 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 markets.
The MAX157BEUA belongs to Maxim's low-power precision ADC product line, engineered specifically for space- and energy-constrained signal acquisition in portable and remote sensing applications.
FAQ
What is the maximum sampling rate of the MAX157BEUA?
The MAX157BEUA achieves a maximum sampling rate of 108ksps under specified conditions: VDD = +2.7V to +5.25V, fSCLK = 2.17MHz (external clock mode), and 16 clock cycles per conversion. At slower rates (e.g., 1ksps), supply current drops to 10µA, enabling adaptive power scaling in duty-cycled systems.
Does the MAX157BEUA include an internal reference voltage source?
No, the MAX157BEUA requires an external reference voltage applied to the REF pin. The device accepts 0V to (VDD + 50mV), with optimal performance at VREF = 2.5V. A minimum 0.1µF ceramic bypass capacitor must be placed close to the REF pin to maintain noise immunity and reference stability during conversion.
How does channel selection work on the MAX157BEUA?
The MAX157BEUA alternates between CH0 and CH1 automatically after each conversion: power-on default is CH0, then CH1, then CH0 again. Channel switching is triggered by toggling CS/SHDN - a falling edge starts conversion on the next channel. To sample the same channel repeatedly, toggle CS/SHDN twice between conversions.
What is the wake-up time from shutdown for the MAX157BEUA?
The MAX157BEUA wakes up from shutdown in 2.5µs when the external reference is stable to within 1 LSB. If the reference requires longer stabilization (e.g., after cold start or low-power rail ramp-up), the wake-up interval must be extended accordingly to avoid conversion errors - verified in Maxim's 19-1388 Rev 0 datasheet Figure 5 timing diagram.
Is the MAX157BEUA pin-compatible with any 12-bit upgrade options?
Yes, the MAX144BEPA and MAX145BEPA are pin-compatible 12-bit upgrades for the MAX157BEUA, sharing identical 8-pin µMAX or DIP footprints and SPI/QSPI/MICROWIRE interface timing. No PCB redesign is needed - only firmware and reference voltage adjustments may be required to exploit the additional resolution.
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:
- Obsolete
- 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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