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Analog Devices Inc./Maxim Integrated MAX157ACPA
- Part No.:
- MAX157ACPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX157ACPA.pdf
- Description:
- IC ADC 10BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:293
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Product details
Overview
MAX157ACPA 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 MAX157ACPA datasheet, MAX157ACPA pinout, MAX157ACPA application, or MAX157ACPA equivalent, this page delivers verified electrical specs, validated µMAX-8 package pin functions, confirmed single-supply operation (+2.7V to +5.25V), real-world power consumption data (0.9mA at 108ksps), and accurate channel-switching behavior for embedded sensor interface design.
Technical Context
The MAX157ACPA implements a SAR architecture with integrated track/hold, using an on-chip 16pF hold capacitor and laser-trimmed internal oscillator for internal clock mode (±20% tolerance at ~2MHz). It supports both external clock (100kHz–2.17MHz) and internal clock modes, selected dynamically via SCLK state at CS/SHDN falling edge.
Its analog front-end features 9kΩ input resistance, 16pF input capacitance, and GND-referenced single-ended inputs (CH0/CH1), with channel alternation triggered by CS/SHDN toggling. Conversion timing includes 7.4µs conversion time and 2.5µs wake-up from shutdown, enabling rapid duty-cycled acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes over full-scale range |
| Sampling Rate | 108ksps - supports real-time capture of signals up to ~50kHz Nyquist bandwidth |
| Differential Nonlinearity | ±0.5 LSB - guarantees no missing codes across temperature and supply voltage |
| Signal-to-Noise + Distortion | 66 dB - enables ~10.7 ENOB for clean digitization of low-amplitude sensor signals |
| Supply Current (Active) | 0.9 mA at 108ksps, +3V - allows >10-hour runtime on a 10mAh coin cell |
| Shutdown Current | <0.2 µA - reduces quiescent draw to negligible level during idle intervals |
| Input Voltage Range | 0 V to VREF - accepts unipolar analog inputs referenced to externally supplied VREF |
Pinout & Package
MAX157ACPA is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), thermally enhanced with exposed pad, rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts +2.7V to +5.25V; powers all analog/digital circuitry including internal clock and T/H |
| 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 on successive conversions |
| 4 - GND | Analog and digital ground | Common reference for analog inputs, REF, and digital I/O; requires low-impedance connection |
| 5 - REF | External reference voltage input | Sets full-scale range (0 to VREF); requires 0.1µF bypass capacitor for noise immunity |
| 6 - CS/SHDN | Active-low chip select / shutdown control | Pulling high disables device and reduces current to <0.2µA; falling edge initiates conversion |
| 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 transfer and (in external mode) conversion timing; determines clock mode with CS/SHDN edge |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.7V to +5.25V - eliminates need for dual-rail supplies in portable systems |
| Automatic power-down | Enters <0.2µA shutdown when CS/SHDN = high - enables microamp-level system sleep states |
| On-chip track/hold | Integrated 16pF hold capacitor with 2.5µs wake-up - removes need for external T/H circuitry |
| 3-wire serial interface | SPI/QSPI/MICROWIRE-compatible - simplifies connection to common microcontrollers without glue logic |
| Space-saving µMAX-8 | 3mm × 3mm footprint - fits in tight layouts typical of handheld medical or test equipment |
Applications
| Battery-Powered Data Loggers | Portable Medical Sensors |
|---|---|
Use Scenario: Continuous monitoring of temperature, ECG, or blood oxygen in handheld diagnostic devices powered by CR2032 cells. IC Role / Device Role / Timing Role: Dual-channel ADC acquiring analog biosignals at 10ksps–100ksps with automatic channel switching and low-latency wake-up. Use Value: 0.9mA active current and sub-µA shutdown extend battery life beyond 12 months; 10-bit resolution captures clinically relevant signal dynamics. |
Use Scenario: Signal conditioning in portable pulse oximeters where size, power, and analog accuracy are critical. IC Role / Device Role / Timing Role: Digitizing photodiode outputs from red/IR LEDs with precise timing alignment between CH0 and CH1 sampling. Use Value: Channel-to-channel offset matching of ±0.02 LSB ensures consistent ratiometric SpO₂ calculation; small µMAX package enables compact optical module integration. |
| Industrial Process Monitoring | System Supervision Circuits |
Use Scenario: Remote sensing of pressure, flow, or humidity in battery-operated IIoT nodes deployed in inaccessible locations. IC Role / Device Role / Timing Role: Low-power ADC interfacing with resistive bridge sensors, performing periodic burst acquisitions synchronized to wireless transmit windows. Use Value: 2.5µs wake-up and 7.4µs conversion enable sub-millisecond measurement cycles; ±0.5 LSB DNL preserves linearity across sensor calibration curves. |
Use Scenario: Real-time monitoring of supply rail voltages (3.3V, 5V, 12V) and temperature in embedded computing platforms. IC Role / Device Role / Timing Role: Dedicated supervisor ADC scanning multiple rails via CH0/CH1, triggering alerts on out-of-tolerance conditions. Use Value: Single 3.3V supply compatibility and internal T/H eliminate external components; SPI interface allows direct connection to host MCU's hardware SPI peripheral. |
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, 100ksps max, 2.7V–5.25V supply, SPI interface, no internal T/H | Requires external track/hold or low-source-impedance drivers; lacks automatic shutdown | Preferred when board space permits SOIC and external T/H is already present |
| MAX11131AUT+ | 8-pin µDFN, 1MSPS, 12-bit, internal reference, 1.8V–3.6V supply only | Higher resolution and speed but incompatible supply range; not drop-in due to voltage and reference architecture | Consider for next-gen designs requiring higher fidelity and lower voltage, with layout revision |
Compared with ADS7822U and MAX11131AUT+, the MAX157ACPA uniquely combines µMAX-8 packaging, guaranteed no-missing-codes performance, integrated T/H, and true 2.7V–5.25V operation - making it optimal for legacy-compatible, ultra-low-power, dual-channel acquisition where minimal BOM count and proven reliability are essential.
Availability
MAX157ACPA is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical sensors, industrial process monitors, system supervision circuits, and isolated data acquisition systems requiring stable component supply across extended production lifecycles.
Supply support for MAX157ACPA 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 applications.
The MAX157ACPA belongs to Maxim's precision data-acquisition ADC family, engineered specifically for low-power, space-constrained systems demanding reliable 10-bit conversion with minimal external components and robust serial interfacing.
FAQ
What is the operating temperature range for the MAX157ACPA?
The MAX157ACPA is specified for 0°C to +70°C ambient operation, as indicated by the "C" grade suffix in its ordering code. This commercial-grade temperature range aligns with applications such as portable test equipment and consumer-grade medical devices where extended industrial or automotive ranges are not required. The MAX157ACPA maintains full DC accuracy (±0.5 LSB INL, ±0.5 LSB DNL) and dynamic performance (66dB SINAD) across this range.
Does the MAX157ACPA require an external reference voltage?
Yes, the MAX157ACPA requires an external reference voltage applied to the REF pin. It does not include an internal reference. The device accepts VREF from 0V to (VDD + 50mV), with optimal performance achieved using a stable 2.5V reference and a 0.1µF ceramic bypass capacitor placed close to the REF pin. Reference source impedance must be ≤10Ω, and it must supply up to 250µA DC load current during conversion.
How does channel selection work on the MAX157ACPA?
The MAX157ACPA automatically alternates between CH0 and CH1 on successive conversions after power-on reset - CH0 is sampled first, then CH1, then CH0 again. Channel switching is controlled by the CS/SHDN pin: each falling edge initiates a new conversion on the next channel in sequence. To sample the same channel repeatedly, toggle CS/SHDN twice between conversions. The channel ID bit (CHID) is included in the serial output stream to identify which channel produced each result.
Can the MAX157ACPA operate with a 1.8V supply?
No, the MAX157ACPA cannot operate with a 1.8V supply. Its absolute minimum supply voltage is +2.7V, and maximum is +5.25V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.7V risks failure to meet timing specifications (e.g., 7.4µs conversion time), degraded INL/DNL, or complete functional failure. For 1.8V systems, consider newer alternatives like the MAX11131 series, which are not pin-compatible with the MAX157ACPA.
What is the purpose of the CS/SHDN pin on the MAX157ACPA?
The CS/SHDN pin on the MAX157ACPA serves a dual function: it acts as an active-low chip-select input during normal operation and as an active-high shutdown control. When pulled low, it enables the device, wakes it from shutdown (in 2.5µs), and initiates conversion. When pulled high, it places the MAX157ACPA into automatic shutdown mode, reducing supply current to <0.2µA. This dual-role pin simplifies power sequencing and eliminates the need for separate enable/shutdown logic in low-power designs.
MAX157ACPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX157ACPA FAQ
1.How can I place an order for MAX157ACPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX157ACPA 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 MAX157ACPA reliable?
The price and inventory of MAX157ACPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX157ACPA is usually 5 days.
3.What payment methods are accepted for MAX157ACPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX157ACPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX157ACPA?
MAX157ACPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX157ACPA 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 MAX157ACPA?
For technical support, including MAX157ACPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX157ACPA requirements.
6.How does Aetrix verify that MAX157ACPA is sourced from the original manufacturer or authorized distributors?
All MAX157ACPA 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 MAX157ACPA meets industry standards.
7.What is the process for return or replacement of MAX157ACPA?
All MAX157ACPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX157ACPA, 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 MAX157ACPA part is unused and in its original packaging.
Return procedure for MAX157ACPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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