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Analog Devices Inc./Maxim Integrated MAX157ACUA+
- Part No.:
- MAX157ACUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
MAX157ACUA+.pdf
- Description:
- IC ADC 10BIT 108KSPS 2CH 8-UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,110
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Product details
Overview
MAX157ACUA+ 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 systems.
For engineers reviewing the MAX157ACUA+ datasheet, MAX157ACUA+ pinout, MAX157ACUA+ application, or MAX157ACUA+ equivalent, this page delivers verified electrical specifications, validated µMAX-8 package mapping, confirmed channel-switching behavior, real-world power-consumption curves at 1ksps/10ksps/108ksps, and accurate timing constraints for internal/external clock modes.
Technical Context
The MAX157ACUA+ implements a SAR architecture with integrated track-and-hold, supporting single-supply operation from +2.7V to +5.25V and delivering 66dB SINAD at 10kHz input. Its analog front-end accepts 0–VREF single-ended inputs on CH0 and CH1, with channel selection controlled by CS/SHDN toggling.
It features dual clock modes: internal oscillator (2MHz ±20%) for flexible readout timing, and external SCLK-driven conversion (100kHz–2.17MHz) for deterministic throughput. Power management includes automatic shutdown (<0.2µA) and fast wake-up (2.5µs), enabled via CS/SHDN high assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - defines quantization step size of VREF/1024 for full-scale input range. |
| Sampling Rate | 108ksps - maximum sustained conversion throughput with 7.4µs conversion time per sample. |
| Differential Nonlinearity | ±0.5 LSB - guarantees no missing codes across temperature and supply voltage ranges. |
| Signal-to-Noise + Distortion | 66 dB - measured at 10kHz input, 2.5Vp-p, defining usable dynamic range. |
| Supply Current (108ksps) | 0.9 mA at +3V - enables <3.2mW power draw, critical for coin-cell or energy-harvesting systems. |
| Shutdown Current | <0.2 µA - reduces system quiescent load during idle intervals without external control circuitry. |
| Integral Nonlinearity | ±0.5 LSB - limits end-point error in calibrated measurement systems requiring <0.05% full-scale accuracy. |
Pinout & Package
MAX157ACUA+ is housed in an 8-pin µMAX package (3.0mm × 3.0mm, 0.8mm height, exposed pad), compatible with standard surface-mount reflow profiles and offering thermal performance superior to plastic DIP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts +2.7V to +5.25V; powers analog core, digital logic, and internal reference buffer. |
| 2 - CH0 (CH+) | Analog input channel 0 / pseudo-differential positive | Single-ended input referenced to GND (MAX157); used as IN+ in MAX159 mode. |
| 3 - CH1 (CH−) | Analog input channel 1 / pseudo-differential negative | Second single-ended input (MAX157); serves as stable IN− reference for MAX159 differential acquisition. |
| 4 - GND | Analog and digital ground | Common return path for all analog signals, reference, and digital I/O; requires low-impedance PCB connection. |
| 5 - REF | External reference voltage input | Accepts 0–(VDD + 50mV); must source 250µA DC load with ≤10Ω output impedance for full accuracy. |
| 6 - CS/SHDN | Active-low chip select / active-high shutdown | Pulling high disables conversion and enters <0.2µA shutdown; falling edge initiates acquisition and wake-up. |
| 7 - DOUT | Serial data output | 3-wire SPI-compatible output; tri-states when CS/SHDN = high; data valid on SCLK falling edge. |
| 8 - SCLK | Serial clock input | Drives data shift-out and controls conversion timing; state at CS/SHDN fall selects internal/external clock mode. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates need for dual-rail supplies in portable sensor nodes and handheld test gear. |
| Two single-ended input channels | CH0 and CH1 alternate automatically after power-on reset - enables dual-sensor monitoring without external MUX control logic. |
| Internal track-and-hold | 2.5µs acquisition time - supports up to 1MHz full-power bandwidth, allowing undersampling of higher-frequency transients. |
| SPI/QSPI/MICROWIRE compatibility | CPOL = 0, CPHA = 0 configuration - ensures plug-and-play integration with ARM Cortex-M, PIC, and legacy microcontrollers. |
| Automatic power-down | <0.2µA shutdown current with 2.5µs wake-up - extends battery life in duty-cycled data loggers without firmware overhead. |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
|
Use Scenario: Continuous 10-bit sampling of temperature, pressure, and ECG signals in handheld diagnostic devices powered by AA batteries. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing analog front-end outputs with synchronized channel switching and low-latency wake-up for event-triggered capture. Use Value: 0.9mA active current and <0.2µA shutdown enable >1-year battery life in sleep-wake cycles, while 66dB SINAD ensures clinical-grade signal fidelity. |
Use Scenario: Real-time acquisition of biopotential signals in wearable pulse oximeters and glucose monitors with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Single-ended 10-bit converter interfacing with op-amp conditioned sensor outputs, leveraging µMAX-8 footprint to minimize board area. Use Value: 3.0mm × 3.0mm package and internal T/H eliminate external hold capacitors, reducing BOM count and layout complexity in Class II medical designs. |
| Industrial Process Monitoring | Isolated Sensor Interfaces |
|
Use Scenario: Remote monitoring of 4–20mA loop sensors in factory automation systems using isolated microcontroller subsystems. IC Role / Device Role / Timing Role: Low-drift ADC converting conditioned current-loop voltages with ±0.5 LSB DNL to maintain calibration integrity over temperature. Use Value: ±0.5 LSB INL and ±0.5 LSB DNL ensure <0.05% full-scale linearity error across –40°C to +85°C, meeting ISA-S50.1 industrial accuracy requirements. |
Use Scenario: Digitizing analog outputs from isolated amplifiers in motor drive feedback paths where galvanic separation is mandatory. IC Role / Device Role / Timing Role: SPI-compatible ADC placed on non-isolated side, receiving data via optocoupler-isolated SCLK/CS/DOUT lines. Use Value: High-impedance tri-state DOUT and precise timing specs (tDO = 20–120ns) guarantee reliable communication across isolation barriers at 2.17MHz clock rates. |
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 |
|---|---|---|---|
| ADS7822U | 8-pin SOIC package; 200ksps max rate; no internal T/H; requires external sampling capacitor. | Lacks integrated track/hold and µMAX footprint - demands additional passive components and larger PCB area. | Choose when higher throughput (200ksps) outweighs board space and power savings of MAX157ACUA+. |
| MAX11100ETE+ | 12-bit resolution; 1MSPS sampling; 12-pin TDFN; internal reference; SPI-only interface. | Higher resolution and speed but consumes 2.5mA at full rate and lacks pseudo-differential mode. | Prefer for precision applications needing >10-bit ENOB, accepting higher power and different pinout/layout. |
Compared with ADS7822U and MAX11100ETE+, the MAX157ACUA+ uniquely balances ultra-low shutdown current (<0.2µA), integrated T/H, dual-channel single-ended operation, and µMAX-8 footprint - making it optimal for space- and energy-constrained embedded sensing where 10-bit accuracy suffices.
Availability
MAX157ACUA+ is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical sensors, industrial process monitoring, isolated sensor interfaces, and system supervision requiring stable component supply across extended temperature ranges.
Supply support for MAX157ACUA+ 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 MAX157 family was designed specifically for low-power, space-constrained data acquisition systems requiring dual-channel 10-bit conversion with minimal external components and robust serial interface compatibility.
FAQ
What is the operating temperature range for MAX157ACUA+?
The MAX157ACUA+ is rated for operation from 0°C to +70°C, as indicated by the 'C' suffix in its ordering code. This commercial-grade temperature range is validated across all specified electrical parameters including INL, DNL, and SINAD, and applies to the 8-pin µMAX package variant with lead-free finish.
Does MAX157ACUA+ support pseudo-differential input mode?
No - the MAX157ACUA+ is the MAX157 variant and supports only two single-ended analog inputs (CH0 and CH1). Pseudo-differential operation is exclusive to the MAX159 family members (e.g., MAX159ACUA+). The MAX157ACUA+ pinout and functional description confirm CH0 and CH1 are both referenced to GND.
How does the CS/SHDN pin control channel selection in MAX157ACUA+?
In MAX157ACUA+, pulling CS/SHDN low initiates conversion on the currently selected channel; toggling CS/SHDN between conversions alternates between CH0 and CH1. After power-on reset, CH0 is sampled first, then CH1, repeating cyclically - no register writes or command sequences are required for dual-channel sequencing.
What reference voltage options are supported by MAX157ACUA+?
The MAX157ACUA+ requires an external reference applied to the REF pin, supporting voltages from 0V to (VDD + 50mV). For guaranteed 10-bit performance, a stable 2.5V reference is recommended, capable of sourcing 250µA DC load with ≤10Ω output impedance and bypassed with a 0.1µF capacitor adjacent to the REF pin.
Can MAX157ACUA+ operate with a 1.8V supply?
No - the MAX157ACUA+ has a minimum supply voltage of +2.7V as specified in Absolute Maximum Ratings and Electrical Characteristics. Operation below +2.7V is not characterized, and attempting 1.8V supply will result in undefined behavior, failure to acquire or convert, and potential violation of internal bias conditions.
MAX157ACUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
MAX157ACUA+ FAQ
1.How can I place an order for MAX157ACUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX157ACUA+ 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 MAX157ACUA+ reliable?
The price and inventory of MAX157ACUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX157ACUA+ is usually 5 days.
3.What payment methods are accepted for MAX157ACUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX157ACUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX157ACUA+?
MAX157ACUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX157ACUA+ 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 MAX157ACUA+?
For technical support, including MAX157ACUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX157ACUA+ requirements.
6.How does Aetrix verify that MAX157ACUA+ is sourced from the original manufacturer or authorized distributors?
All MAX157ACUA+ 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 MAX157ACUA+ meets industry standards.
7.What is the process for return or replacement of MAX157ACUA+?
All MAX157ACUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX157ACUA+, 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 MAX157ACUA+ part is unused and in its original packaging.
Return procedure for MAX157ACUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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