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Analog Devices Inc./Maxim Integrated MAX157AEUA+
- Part No.:
- MAX157AEUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX157AEUA+.pdf
- Description:
- IC ADC 10BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,196
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Product details
Overview
MAX157AEUA+ 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 DNL, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for precision signal acquisition in space-constrained, battery-powered instrumentation.
For engineers reviewing the MAX157AEUA+ datasheet, MAX157AEUA+ pinout, MAX157AEUA+ application, or MAX157AEUA+ equivalent, this device delivers verified 10-bit resolution with <0.2 µA shutdown current, internal track/hold, and 8-pin µMAX packaging - critical for portable data logging, medical sensors, and isolated industrial monitoring where power budget and board area are tightly constrained.
Technical Context
The MAX157AEUA+ implements a SAR architecture with integrated track/hold, supporting external or internal clock modes. It samples CH0 and CH1 alternately in single-ended mode, with channel selection controlled by CS/SHDN toggling, and features a 7.4 µs conversion time at 2.17 MHz SCLK.
Its analog front-end includes 9 kΩ input resistance, 16 pF input capacitance, and internal protection diodes enabling safe operation from GND −300 mV to VDD +300 mV - while requiring stable reference delivery of 250 µA DC load current and ≤10 Ω output impedance for full accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - defines quantization step size of 2.5V/1024 ≈ 2.44 mV for VREF = 2.5V full-scale range |
| Sampling Rate | 108 ksps - supports Nyquist-limited bandwidth up to 54 kHz without aliasing |
| Differential Nonlinearity | ±0.5 LSB - guarantees no missing codes across temperature and supply voltage |
| Supply Voltage Range | +2.7 V to +5.25 V - enables direct operation from single Li-ion or 3.3 V/5 V system rails |
| Shutdown Current | <0.2 µA - extends battery life in sleep intervals between sensor readings |
| Signal-to-Noise+Distortion | 66 dB - corresponds to ~10.7 ENOB at 10 kHz input, suitable for medium-precision measurement |
| Small-Signal Bandwidth | 2.25 MHz - allows accurate digitization of fast transients and undersampling applications |
Pinout & Package
MAX157AEUA+ is housed in an 8-pin µMAX package (3.0 mm × 3.0 mm, 0.8 mm height), thermally enhanced with exposed pad, rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7 V to +5.25 V; powers all analog and digital circuitry including internal clock and T/H |
| CH0 (Pin 2) | Analog input channel 0 | Single-ended input referenced to GND; sampled first after power-on reset |
| CH1 (Pin 3) | Analog input channel 1 | Single-ended input referenced to GND; alternates with CH0 on successive conversions |
| GND (Pin 4) | Analog and digital ground | Common return for reference, inputs, and digital I/O; must be low-impedance to minimize noise coupling |
| SCLK (Pin 8) | Serial clock input | Controls data timing; falling edge clocks DOUT; state at CS/SHDN fall selects internal/external clock mode |
| DOUT (Pin 7) | Serial data output | 3-wire SPI-compatible output; high-impedance when CS/SHDN = high; MSB-first 16-bit frame format |
| CS/SHDN (Pin 6) | Chip-select / shutdown control | Active-low enable; high state forces automatic shutdown (<0.2 µA); toggling selects channel or initiates conversion |
| REF (Pin 5) | External reference input | Defines full-scale range (0 to VREF); requires 0.1 µF bypass capacitor and ≤10 Ω source impedance |
Key Features
| Feature | Design Value |
|---|---|
| Automatic power-down | Enters sub-0.2 µA shutdown automatically when CS/SHDN = high - eliminates need for software-controlled sleep sequencing |
| Internal track/hold | Eliminates external sample-and-hold requirement; acquisition time tACQ = 2.5 µs ensures minimal aperture jitter (<50 ps) |
| 3-wire serial interface | Reduces PCB routing complexity vs. parallel ADCs; compatible with SPI/QSPI/MICROWIRE without level-shifting |
| Two single-ended channels | Enables dual-sensor monitoring (e.g., temperature + voltage) without multiplexer or additional ADC hardware |
| Low supply current at 108 ksps | 0.9 mA at +3 V - enables continuous 100 ksps acquisition for >10 hours on a 100 mAh coin cell |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous acquisition of temperature and humidity from MEMS sensors in handheld environmental monitors. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing two analog sensor outputs with synchronized sampling and low-latency serial readout. Use Value: 108 ksps throughput and 0.9 mA active current allow 24-hour logging on CR2032; µMAX package fits within 100 mm² PCB footprint. | Use Scenario: ECG front-end signal conditioning in wearable heart-rate monitors with lead-off detection. IC Role / Device Role / Timing Role: Precision digitization of amplified biopotential signals with guaranteed no-missing-codes performance over body temperature range. Use Value: ±0.5 LSB DNL and 66 dB SINAD ensure diagnostic-grade waveform fidelity; shutdown mode extends battery life during idle periods. |
| Industrial Process Monitoring | Isolated Sensor Interfaces |
Use Scenario: Remote monitoring of pressure and flow transducers in factory automation nodes powered via 4–20 mA loop. IC Role / Device Role / Timing Role: High-accuracy ADC interfacing with isolated analog inputs, operating from limited loop-derived supply. Use Value: Single +3.3 V operation and 2.7 V minimum supply support energy harvesting; 2.25 MHz small-signal BW captures transient process events. | Use Scenario: Digitizing thermocouple or RTD outputs across galvanic isolation barriers using optocouplers or digital isolators. IC Role / Device Role / Timing Role: Low-noise, low-power ADC placed on isolated side with minimal supply current draw and robust digital interface timing. Use Value: 3-wire SPI compatibility simplifies isolated data transfer; <0.2 µA shutdown prevents leakage-induced drift in high-impedance sensor paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit resolution, 200 ksps, SPI-only interface, no internal T/H, higher 1.25 mA active current | Higher resolution required; no need for pseudo-differential mode; system already uses SPI master with tight timing margins | Select when ENOB > 11 bits is mandatory and board space permits larger SO-8 package |
| MAX11100ETE+ | 12-bit, 500 ksps, internal reference, 10-pin TDFN, 1.8–3.6 V supply only | Requires internal reference simplicity; operates from lower voltage rails; needs faster sampling than 108 ksps | Choose for ultra-low-voltage designs where external reference management is undesirable |
Compared with ADS7822U and MAX11100ETE+, the MAX157AEUA+ offers optimal trade-off of 10-bit precision, dual-channel flexibility, sub-1 µA shutdown, and proven µMAX footprint - making it preferred for cost-sensitive, space-constrained, battery-operated systems needing reliable single-supply operation down to +2.7 V.
Availability
MAX157AEUA+ is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical sensors, and industrial process monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX157AEUA+ 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, automotive, and communications markets.
The MAX157AEUA+ belongs to Maxim's precision data acquisition product line, engineered for low-power, high-accuracy signal digitization in portable and space-constrained systems - emphasizing ease of integration, minimal external components, and robust serial interface compatibility.
FAQ
What is the maximum sampling rate of the MAX157AEUA+?
The MAX157AEUA+ achieves a maximum sampling rate of 108 ksps under specified conditions: VDD = +2.7 V to +5.25 V, fSCLK = 2.17 MHz, and 16 clock cycles per conversion. This rate is sustained with 0.9 mA supply current at +3 V and maintains ±0.5 LSB DNL and 66 dB SINAD performance. Sampling at lower rates reduces current consumption proportionally - e.g., 10 ksps draws 100 µA.
Does the MAX157AEUA+ include an internal reference voltage?
No, the MAX157AEUA+ requires an external reference voltage applied to the REF pin. The device accepts VREF from 0 V to (VDD + 50 mV), with recommended 2.5 V for full 10-bit performance. The reference must deliver 250 µA DC load current and exhibit ≤10 Ω output impedance; a 0.1 µF ceramic capacitor is mandatory at the REF pin for stability and noise reduction.
How does channel selection work on the MAX157AEUA+?
The MAX157AEUA+ alternates between CH0 and CH1 on successive conversions after power-on reset: CH0 is sampled first, then CH1, then CH0 again. Channel switching is triggered by toggling the CS/SHDN pin low-to-high-to-low. To sample the same channel repeatedly, toggle CS/SHDN twice between conversions. The channel ID bit (CHID) appears in the serial output stream before the MSB.
What is the wake-up time from shutdown for the MAX157AEUA+?
The MAX157AEUA+ wakes up from shutdown in 2.5 µs when the external reference is stable to within 1 LSB. If the reference is not pre-stabilized, wake-up time must be extended to allow reference settling - typically adding 10–20 µs depending on reference circuit RC time constant. During wake-up, the internal track/hold enters tracking mode on the falling edge of CS/SHDN.
Is the MAX157AEUA+ compatible with standard microcontroller SPI peripherals?
Yes, the MAX157AEUA+ is fully compatible with standard SPI, QSPI, and MICROWIRE interfaces. It requires CPOL = 0 and CPHA = 0 configuration. Data is output MSB-first on DOUT, changing on the falling edge of SCLK and sampled on the rising edge. A complete 16-bit frame (including EOC, CHID, 10 data bits, and 2 sub-LSBs) is delivered across two 8-bit reads - matching common MCU SPI FIFO handling.
MAX157AEUA+ 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:
- -
MAX157AEUA+ FAQ
1.How can I place an order for MAX157AEUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX157AEUA+ 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 MAX157AEUA+ reliable?
The price and inventory of MAX157AEUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX157AEUA+ is usually 5 days.
3.What payment methods are accepted for MAX157AEUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX157AEUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX157AEUA+?
MAX157AEUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX157AEUA+ 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 MAX157AEUA+?
For technical support, including MAX157AEUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX157AEUA+ requirements.
6.How does Aetrix verify that MAX157AEUA+ is sourced from the original manufacturer or authorized distributors?
All MAX157AEUA+ 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 MAX157AEUA+ meets industry standards.
7.What is the process for return or replacement of MAX157AEUA+?
All MAX157AEUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX157AEUA+, 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 MAX157AEUA+ part is unused and in its original packaging.
Return procedure for MAX157AEUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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