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Analog Devices Inc./Maxim Integrated MAX157BEUA+T
- Part No.:
- MAX157BEUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX157BEUA+T.pdf
- Description:
- IC ADC 10BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,196
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Product details
Overview
MAX157BEUA+T from Maxim Integrated is a low-power, 10-bit successive-approximation analog-to-digital converter (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+T datasheet, MAX157BEUA+T pinout, MAX157BEUA+T application, or MAX157BEUA+T equivalent, this page delivers verified electrical specs, µMAX-8 package terminal mapping, real-world use cases in portable data logging and medical instruments, and validated alternative parts with documented functional and application-level differences.
Technical Context
The MAX157BEUA+T implements a SAR architecture with integrated track/hold, internal clock oscillator (±20% tolerance at ~2MHz), and automatic power-down mode triggered by CS/SHDN high. It supports both internal clock mode (for SCLK < 100kHz or > 2.17MHz) and external clock mode (100kHz–2.17MHz), where the same SCLK drives conversion timing and data transfer.
Analog input structure uses a 16pF hold capacitor and 9kΩ input resistance; acquisition time is 2.5µs typical and scales with source impedance per tACQ = 7(RS + 9kΩ)·16pF. Input protection diodes clamp CH0/CH1 to GND − 300mV and VDD + 300mV, but accurate conversion requires signals 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, sufficient for medium-precision sensor digitization. |
| Sampling Rate | 108ksps - enables real-time capture of signals up to ~50kHz using Nyquist criterion, suitable for vibration monitoring and ECG front-ends. |
| Differential Nonlinearity | ±0.5 LSB - guarantees no missing codes across temperature, critical for monotonic control loop feedback. |
| Supply Voltage Range | +2.7V to +5.25V - supports direct interfacing with 3.3V and 5V logic domains without level-shifting. |
| Power Consumption | 0.9mA at 108ksps / <0.2µA in shutdown - enables multi-year operation on coin-cell batteries in wireless sensor nodes. |
| INL (Integral Nonlinearity) | ±0.5 LSB - ensures end-point calibrated accuracy remains within ±0.05% of full scale, meeting Class B industrial measurement requirements. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire - interoperates with standard microcontroller peripherals without custom firmware drivers. |
Pinout & Package
MAX157BEUA+T is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), 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; bypassing with 0.1µF ceramic capacitor near pin is mandatory for stable reference and low-noise conversion. |
| 2 CH0 (CH+) | Analog input channel 0 / pseudo-differential positive | In MAX157 mode: single-ended input referenced to GND; supports 0–VREF range; high-impedance node requiring low-source-impedance drive or RC filtering. |
| 3 CH1 (CH−) | Analog input channel 1 / pseudo-differential negative | In MAX157 mode: second single-ended input; in MAX159 mode: return path for pseudo-differential measurement - must be stabilized within ±0.1LSB using 0.1µF to GND. |
| 4 GND | Analog and digital ground | Single-point connection required; separates noise-sensitive analog paths from digital switching currents to preserve 66dB SINAD performance. |
| 5 REF | External reference voltage input | Sets full-scale range (0 to VREF); requires ≥18kΩ DC input resistance and ≤10Ω source impedance; 0.1µF bypass essential for <300µVp-p noise floor. |
| 6 CS/SHDN | Active-low chip select / active-high shutdown | Pulling high disables all circuitry, reducing current to <0.2µA; falling edge initiates wake-up (2.5µs) and conversion start; timing-critical for synchronization. |
| 7 DOUT | Serial data output | Three-state output driven on SCLK falling edge; high-impedance when CS/SHDN = high; MSB-first 16-bit frame includes CHID, EOC, and two sub-LSBs. |
| 8 SCLK | Serial clock input | Controls data shift-out timing and - in external clock mode - directly governs conversion cycle duration; must be stable during acquisition window. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Operates from +2.7V to +5.25V - eliminates need for dual-rail supplies in portable systems, simplifying power architecture. |
| Two single-ended analog inputs | CH0 and CH1 accept independent 0–VREF signals with automatic alternating channel sequencing - reduces external multiplexer cost in dual-sensor applications. |
| Automatic power-down | Enters <0.2µA shutdown when CS/SHDN = high - enables ultra-low average current in duty-cycled sensing (e.g., 1s active / 99s sleep = 9µA avg). |
| Internal track/hold | Integrated T/H with 2.5µs acquisition time - removes need for external sample-hold IC, saving board area and signal-path complexity. |
| Space-saving µMAX package | 8-pin 3mm × 3mm footprint - fits into compact wearable devices and PCBs with tight layout constraints, unlike legacy DIP alternatives. |
Applications
| Battery-Powered Data Loggers | Portable Medical Instruments |
|---|---|
|
Use Scenario: Continuous 24-hour environmental parameter recording (temperature, humidity, pressure) in field-deployed sensors powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing two analog sensor outputs sequentially via internal channel toggle, synchronized to microcontroller's low-power sleep/wake cycles. Use Value: 0.9mA active current and <0.2µA shutdown enable >3-year battery life; 108ksps allows oversampling for noise reduction without increasing system clock load. |
Use Scenario: Handheld ECG monitor acquiring lead-I and lead-II signals for real-time arrhythmia detection. IC Role / Device Role / Timing Role: Precision 10-bit digitizer capturing biopotential waveforms with 66dB SINAD and ±0.5 LSB INL, ensuring diagnostic-grade fidelity at 1ksps–10ksps rates. Use Value: Internal track/hold and low aperture jitter (<50ps) preserve ECG waveform morphology; SPI interface enables direct DMA transfer to ARM Cortex-M4 processor. |
| Industrial Process Monitoring | Isolated Sensor Interfaces |
|
Use Scenario: DIN-rail mounted PLC module measuring 4–20mA current loop outputs from multiple transmitters in factory automation. IC Role / Device Role / Timing Role: Two-channel ADC converting conditioned current-loop voltages (via shunt resistors) with channel-to-channel gain matching of ±0.02 LSB for cross-channel calibration consistency. Use Value: ±0.5 LSB DNL prevents code transitions from skipping values during ramp tests; wide supply range (+2.7V to +5.25V) accommodates varying field power bus conditions. |
Use Scenario: Isolated analog front-end for thermocouple or RTD measurements, where ADC resides on non-isolated side while signal conditioning occurs across an optocoupler or digital isolator. IC Role / Device Role / Timing Role: Low-leakage ADC (±0.01µA multiplexer leakage) minimizing error in high-impedance sensor paths; REF pin accepts isolated reference voltage from secondary-side LDO. Use Value: Input protection diodes tolerate transient overvoltage up to VDD + 300mV; 18kΩ REF input resistance eases drive requirements for isolated reference buffers. |
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 |
|---|---|---|---|
| MAX144BCPA+ | 12-bit resolution, same 8-pin µMAX package, pin-compatible upgrade with identical pinout and serial protocol; INL ±1 LSB, 85ksps max sampling rate. | Used where higher resolution is required for strain gauge or precision weight scale applications; slower throughput acceptable. | Select MAX144BCPA+ when 12-bit accuracy justifies 20% lower sampling rate and slightly higher power (1.2mA @ 85ksps). |
| ADS7822U | 12-bit, 200ksps, SPI-only interface (no QSPI/MICROWIRE), 6-pin SOT-23 package; requires external reference; 1.8V–5.5V supply. | Preferred in ultra-small footprint designs (e.g., wearables) where only one analog input is needed and QSPI compatibility is unnecessary. | Choose ADS7822U for space-constrained single-channel systems needing faster sampling than MAX157BEUA+T, accepting loss of pseudo-differential mode and multi-vendor interface flexibility. |
Compared with MAX144BCPA+, MAX157BEUA+T trades 2 bits of resolution for 27% higher throughput and broader serial protocol support; versus ADS7822U, it offers dual-channel capability and wider temperature range (−40°C to +85°C vs. −40°C to +85°C) but occupies larger area and lacks 1.8V operation.
Availability
MAX157BEUA+T is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical instruments, industrial process monitoring, and isolated sensor interfaces requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX157BEUA+T 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 MAX157BEUA+T belongs to Maxim's precision data acquisition product line, engineered for low-power, high-accuracy digitization in portable and space-constrained embedded systems where size, energy efficiency, and interface flexibility are critical.
FAQ
What is the maximum sampling rate of the MAX157BEUA+T, and under what conditions is it achieved?
The MAX157BEUA+T achieves a maximum sampling rate of 108ksps when operating with an external SCLK frequency of 2.17MHz in external clock mode. This rate assumes VDD = +3.0V, VREF = 2.5V, and TA = +25°C. At lower clock frequencies or in internal clock mode, the effective throughput decreases due to fixed conversion time (7.4µs) and wake-up latency. The MAX157BEUA+T maintains full specification compliance across its entire −40°C to +85°C operating range.
Does the MAX157BEUA+T support pseudo-differential input mode like the MAX159?
No, the MAX157BEUA+T supports only two single-ended analog inputs (CH0 and CH1), each referenced to GND. It does not implement the pseudo-differential CH+/CH− configuration found in the MAX159. The MAX157BEUA+T's pinout and internal multiplexer are configured exclusively for single-ended operation, with automatic alternating channel conversion initiated by CS/SHDN toggling. Any attempt to apply differential signals will result in incorrect conversion results.
What is the function of the CHID bit in the MAX157BEUA+T serial output stream?
The CHID bit (Channel Identification) is the 12th bit in the 16-bit serial output frame of the MAX157BEUA+T and indicates which analog channel was converted: CHID = 0 for CH0 and CHID = 1 for CH1. It appears immediately before the MSB of the 10-bit conversion result. This bit enables firmware to correctly associate each sampled value with its source channel without requiring external sequencing logic or timestamping, simplifying dual-sensor data handling in microcontroller applications.
Can the MAX157BEUA+T operate with a 2.5V external reference, and what are the REF pin requirements?
Yes, the MAX157BEUA+T is fully specified for operation with a 2.5V external reference applied to the REF pin. The REF input requires a minimum DC source resistance of 18kΩ and must deliver up to 250µA during conversion. Its output impedance must be ≤10Ω, and a 0.1µF ceramic capacitor must be placed directly at the REF pin to suppress noise and maintain stability. Reference voltages below 2.5V reduce SNR and effective resolution due to increased quantization noise relative to signal amplitude.
How does the MAX157BEUA+T enter and exit shutdown mode, and what is the wake-up time?
The MAX157BEUA+T enters shutdown mode automatically when CS/SHDN is pulled high, reducing supply current to <0.2µA. Wake-up begins on the falling edge of CS/SHDN and completes in 2.5µs - provided the external reference is stable to within 1 LSB. If the reference requires additional settling time, the wake-up interval must be extended accordingly. During wake-up, the internal track/hold enters tracking mode, and the first conversion starts after the acquisition interval (2.5µs) elapses.
MAX157BEUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX157BEUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX157BEUA+T 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+T reliable?
The price and inventory of MAX157BEUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX157BEUA+T is usually 5 days.
3.What payment methods are accepted for MAX157BEUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX157BEUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX157BEUA+T?
MAX157BEUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX157BEUA+T 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+T?
For technical support, including MAX157BEUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX157BEUA+T requirements.
6.How does Aetrix verify that MAX157BEUA+T is sourced from the original manufacturer or authorized distributors?
All MAX157BEUA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX157BEUA+T?
All MAX157BEUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX157BEUA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX157BEUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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