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Analog Devices Inc./Maxim Integrated MAX157BCUA+
- Part No.:
- MAX157BCUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX157BCUA+.pdf
- Description:
- IC ADC 10BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:118
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Product details
Overview
MAX157BCUA+ 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 operating from +2.7V to +5.25V.
For engineers reviewing the MAX157BCUA+ datasheet, MAX157BCUA+ pinout, MAX157BCUA+ application, or MAX157BCUA+ equivalent, this page delivers verified electrical specifications, µMAX-8 package terminal mapping, real-world use scenarios in medical instruments and system supervision, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The MAX157BCUA+ implements an on-chip track-and-hold (T/H) circuit with 2.5µs wake-up time and 7.4µs conversion time using an internal laser-trimmed oscillator or external clock up to 2.17MHz. It supports automatic power-down mode drawing <0.2µA supply current when CS/SHDN is high.
Its analog input structure accepts 0V to VREF signals on CH0 and CH1 (both referenced to GND), with channel switching controlled by CS/SHDN toggling. The device requires an external reference (0–VDD+50mV) capable of sourcing 250µA DC load current and uses a 0.1µF bypass capacitor at REF for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR architecture with no missing codes over temperature |
| Sampling Rate | 108ksps maximum throughput; supports variable rates down to 1ksps |
| Differential Nonlinearity | ±0.5 LSB ensures monotonic operation across full temperature range |
| Supply Voltage Range | +2.7V to +5.25V single supply enables direct Li-ion or 3.3V system integration |
| Power Consumption | 0.9mA at 108ksps (+3V); drops to 10µA at 1ksps and <0.2µA in shutdown |
| Reference Input | External REF pin requiring 0.1µF bypass capacitor; supports 0–VDD+50mV range |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire protocol with MSB-first 16-bit output frame |
Pinout & Package
MAX157BCUA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), RoHS-compliant, with exposed pad for thermal enhancement and standard JEDEC MO-187AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections |
| CH0 (Pin 2) | Analog input channel 0 | Single-ended input referenced to GND; default channel after power-on reset |
| CH1 (Pin 3) | Analog input channel 1 | Single-ended input referenced to GND; alternates with CH0 during continuous conversions |
| GND (Pin 4) | Analog and digital ground | Common return path; must be low-impedance and star-connected for noise control |
| REF (Pin 5) | External reference voltage input | Sets full-scale range (0 to VREF); requires 0.1µF ceramic bypass capacitor |
| CS/SHDN (Pin 6) | Active-low chip select / active-high shutdown | Pulling high enters <0.2µA shutdown; falling edge initiates conversion and wake-up |
| SCLK (Pin 7) | Serial clock input | Controls data transfer timing; determines internal vs. external clock mode based on level at CS/SHDN fall |
| DOUT (Pin 8) | Serial data output | 3-state output with MSB-first 16-bit frame; high-impedance when CS/SHDN = high |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Operates from +2.7V to +5.25V without external level shifters or dual supplies |
| Automatic power-down | Enters <0.2µA shutdown automatically when CS/SHDN is high; 2.5µs wake-up time |
| On-chip track/hold | Eliminates need for external T/H amplifier; supports 2.25MHz small-signal bandwidth |
| Pin-compatible upgrade path | Direct replacement for 12-bit MAX144/MAX145 in same µMAX-8 footprint |
| Low-noise serial interface | SPI/QSPI/MICROWIRE compatibility ensures seamless integration with common microcontrollers |
Applications
| Battery-Powered Systems | Portable Data Logging |
|---|---|
Use Scenario: Continuous voltage monitoring in handheld multimeters powered by coin-cell batteries. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes sensor outputs and supply rails with minimal quiescent current. Use Value: 0.9mA active current and <0.2µA shutdown enable multi-year battery life at 1ksps sampling. |
Use Scenario: Environmental sensor node recording temperature, humidity, and light levels every 10 seconds. IC Role / Device Role / Timing Role: Low-power 10-bit converter interfaces directly to microcontroller SPI bus with automatic channel sequencing. Use Value: Internal T/H and 2.5µs wake-up allow rapid sampling bursts followed by deep sleep, minimizing system energy per sample. |
| Medical Instruments | System Supervision |
Use Scenario: Patient vital sign monitor acquiring ECG lead voltages and battery status in compact wearable form factor. IC Role / Device Role / Timing Role: Single-ended dual-input ADC conditions analog front-end signals before digital processing. Use Value: ±0.5 LSB DNL and 66dB SINAD ensure clinical-grade accuracy without post-calibration firmware compensation. |
Use Scenario: Industrial PLC module monitoring rail voltages, temperature sensors, and fault indicators across multiple subsystems. IC Role / Device Role / Timing Role: System-level supervisor ADC provides real-time health telemetry via shared SPI bus. Use Value: 108ksps throughput and 16-bit serial output format simplify firmware parsing and reduce host CPU 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 |
|---|---|---|---|
| MAX144BCPA+ | 12-bit resolution, same µMAX-8 package, 100ksps max sampling rate, higher INL (±1 LSB) | Requires higher precision but lower speed; better suited for static sensor measurement than dynamic signal capture | Select when resolution >10 bits is mandatory and 100ksps suffices |
| ADS7822U | 12-bit, 200ksps, SPI-only interface, no internal T/H, requires external reference buffer | Higher speed and resolution but increases BOM count and layout complexity | Select when system demands >108ksps and can accommodate external support components |
Compared with MAX157BCUA+, MAX144BCPA+ offers higher resolution in identical packaging but trades off speed and linearity; ADS7822U delivers faster throughput but lacks integrated track/hold and requires additional reference conditioning circuitry.
Availability
MAX157BCUA+ is available at Aetrix Electronics and suitable for battery-powered systems, portable data logging, medical instruments, and system supervision requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX157BCUA+ 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX157BCUA+ belongs to Maxim's low-power serial ADC product line, engineered specifically for space-constrained, battery-operated systems needing high accuracy, fast wake-up, and minimal active current.
FAQ
What is the maximum sampling rate of the MAX157BCUA+?
The MAX157BCUA+ achieves a maximum sampling rate of 108ksps under external clock mode with fSCLK = 2.17MHz. At this rate, it draws 0.9mA from a +3V supply. Lower throughput rates (e.g., 1ksps) reduce current to 10µA, enabling ultra-low-power operation while maintaining full 10-bit performance. The device retains no missing codes across its full operating temperature range.
Does the MAX157BCUA+ require an external reference voltage?
Yes, the MAX157BCUA+ requires an external reference voltage applied to the REF pin. It supports reference voltages from 0V to VDD+50mV, with optimal performance at 2.5V. A 0.1µF ceramic capacitor must be placed close to the REF pin to ensure stability. The reference must source up to 250µA DC load current during conversion and maintain output impedance ≤10Ω.
How does channel selection work on the MAX157BCUA+?
The MAX157BCUA+ features two single-ended analog inputs (CH0 and CH1), both referenced to GND. After power-on reset, it defaults to CH0. Channel switching occurs automatically on each conversion cycle when CS/SHDN is held low - alternating between CH0 and CH1. To convert the same channel repeatedly, toggle CS/SHDN twice between conversions. CHID bit in the output stream identifies the active channel.
What package type is used for the MAX157BCUA+?
The MAX157BCUA+ is packaged in an 8-pin µMAX (3mm × 3mm, 0.8mm height) with exposed thermal pad. This RoHS-compliant package matches JEDEC MO-187AC mechanical dimensions and provides superior thermal performance versus plastic DIP alternatives. It is pin-compatible with the MAX144/MAX145 12-bit upgrade family.
Can the MAX157BCUA+ operate from a 3.3V supply?
Yes, the MAX157BCUA+ operates fully across +2.7V to +5.25V, making it compatible with standard 3.3V logic and power domains. At +3.3V, typical supply current is 1.05mA at 108ksps, and shutdown current remains below 0.2µA. All digital interface levels (VIH/VIL) and analog input ranges scale correctly within this supply range without external level translation.
MAX157BCUA+ 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX157BCUA+ FAQ
1.How can I place an order for MAX157BCUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX157BCUA+ 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 MAX157BCUA+ reliable?
The price and inventory of MAX157BCUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX157BCUA+ is usually 5 days.
3.What payment methods are accepted for MAX157BCUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX157BCUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX157BCUA+?
MAX157BCUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX157BCUA+ 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 MAX157BCUA+?
For technical support, including MAX157BCUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX157BCUA+ requirements.
6.How does Aetrix verify that MAX157BCUA+ is sourced from the original manufacturer or authorized distributors?
All MAX157BCUA+ 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 MAX157BCUA+ meets industry standards.
7.What is the process for return or replacement of MAX157BCUA+?
All MAX157BCUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX157BCUA+, 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 MAX157BCUA+ part is unused and in its original packaging.
Return procedure for MAX157BCUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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