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Analog Devices Inc./Maxim Integrated MAX159ACPA+
- Part No.:
- MAX159ACPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX159ACPA+.pdf
- Description:
- IC ADC 10BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,649
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Product details
Overview
MAX159ACPA+ from Maxim Integrated is a 10-bit pseudo-differential successive-approximation analog-to-digital converter (ADC) with SPI/QSPI/MICROWIRE-compatible 3-wire serial interface, 108ksps sampling rate, ±0.5 LSB DNL, and 2.25MHz small-signal bandwidth. It operates from a single +2.7V to +5.25V supply and draws only 0.9mA at full speed, making it suitable for portable instrumentation and isolated data acquisition systems.
For engineers reviewing the MAX159ACPA+ datasheet, MAX159ACPA+ pinout, MAX159ACPA+ application, or MAX159ACPA+ equivalent, key selection criteria include its pseudo-differential input architecture, internal track/hold, automatic shutdown (<0.2µA), 8-pin µMAX package, and compatibility with low-power microcontroller interfaces requiring minimal board space and supply current.
Technical Context
The MAX159ACPA+ implements a SAR ADC architecture with an integrated track/hold stage and laser-trimmed internal oscillator for internal clock mode operation. Its pseudo-differential input pair (CH+, CH−) samples only the CH+ signal while requiring CH− to remain stable within ±0.5 LSB relative to GND during conversion.
It supports two clock modes: external clock (100kHz–2.17MHz) for maximum throughput, and internal clock (≤100kHz or >2.17MHz) for system flexibility. The 3-wire serial interface outputs a 16-bit frame including EOC flag, channel ID, 10-bit result, and two sub-LSB bits, with data valid on SCLK falling edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes over full-scale range |
| Sampling Rate | 108ksps - enables real-time capture of signals up to ~50kHz Nyquist bandwidth |
| Differential Nonlinearity | ±0.5 LSB - guarantees no missing codes across temperature and supply range |
| Small-Signal Bandwidth | 2.25MHz - supports accurate digitization of fast transients and undersampling applications |
| Supply Current (Active) | 0.9mA at 108ksps, +3V - enables battery operation with multi-hour runtime in low-duty-cycle systems |
| Shutdown Current | <0.2µA - reduces quiescent power to negligible level during idle intervals |
| INL | ±0.5 LSB - ensures end-point calibrated accuracy within 0.05% of full scale |
Pinout & Package
MAX159ACPA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), specified for 0°C to +70°C operating temperature range. The package features exposed pad for thermal enhancement and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive supply input | Accepts +2.7V to +5.25V; powers all analog and digital circuitry |
| 2 CH0 (CH+) | Pseudo-differential positive input | Analog signal input; sampled during conversion; referenced to CH− |
| 3 CH1 (CH−) | Pseudo-differential negative input | Reference node for CH+; must remain stable within ±0.5 LSB vs. GND |
| 4 GND | Analog and digital ground | Common return path; requires low-impedance connection to minimize noise coupling |
| 5 REF | External reference voltage input | Sets full-scale range (0 to VREF); requires 0.1µF bypass capacitor for stability |
| 6 CS/SHDN | Active-low chip select / active-high shutdown | Pulling high disables device and enters <0.2µA shutdown; falling edge initiates conversion |
| 7 DOUT | Serial data output | 3-wire SPI-compatible output; tri-states when CS/SHDN is high; data valid on SCLK falling edge |
| 8 SCLK | Serial clock input | Drives data transfer and conversion timing; state at CS/SHDN fall selects internal/external clock mode |
Key Features
| Feature | Design Value |
|---|---|
| Pseudo-differential input architecture | Enables rejection of common-mode noise on CH− while sampling CH+, improving measurement integrity in noisy environments |
| Internal track/hold with 2.5µs wake-up | Eliminates need for external T/H circuitry and allows rapid response to conversion triggers without external timing coordination |
| Automatic power-down on CS/SHDN high | Reduces system-level standby power without software intervention-critical for energy-harvesting and battery-limited nodes |
| SPI/QSPI/MICROWIRE-compatible interface | Direct connection to industry-standard microcontroller serial peripherals without level-shifting or protocol translation logic |
| On-chip laser-trimmed oscillator | Provides ±20% clock accuracy for internal mode, freeing host MCU from clock generation and enabling flexible polling-based readout |
Applications
| Battery-Powered Instrumentation | Isolated Data Acquisition |
|---|---|
|
Use Scenario: Handheld multimeter or portable sensor node acquiring voltage/current readings intermittently over days on coin-cell power. IC Role / Device Role / Timing Role: Primary ADC converting analog sensor outputs to digital; manages its own power state via CS/SHDN to minimize average current draw. Use Value: 0.9mA active current and <0.2µA shutdown enable >1-year battery life at 1-sample-per-second duty cycle. |
Use Scenario: Industrial field transmitter with galvanic isolation barrier digitizing 4–20mA loop signals or thermocouple outputs. IC Role / Device Role / Timing Role: Isolated-side ADC providing precise, low-noise conversion; pseudo-differential input rejects common-mode noise induced across isolation barrier. Use Value: ±0.5 LSB DNL and 2.25MHz small-signal bandwidth ensure accurate representation of fast transients despite isolation-induced signal degradation. |
| Medical Patient Monitoring | Process-Control Sensor Interface |
|
Use Scenario: Wearable ECG front-end digitizing low-amplitude biopotential signals with strict size and power constraints. IC Role / Device Role / Timing Role: Signal-chain ADC accepting pseudo-differential electrode inputs; internal T/H eliminates external components and saves PCB area. Use Value: 8-pin µMAX footprint and integrated reference buffer interface reduce BOM count and layout complexity in miniaturized medical enclosures. |
Use Scenario: PLC analog input module measuring temperature, pressure, or flow using RTDs or strain gauges in factory automation. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC interfacing to precision sensor bridges; INL ±0.5 LSB ensures compliance with Class A industrial accuracy standards. Use Value: Gain error temperature coefficient of ±0.8 ppm/°C minimizes calibration drift across 0°C to +70°C operating range. |
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, 200ksps, SPI-only interface, no internal T/H, requires external reference buffer | Higher resolution but lacks pseudo-differential input and automatic shutdown; needs additional support circuitry | Select when 12-bit accuracy outweighs board space and power savings of MAX159ACPA+ |
| MAX11100ETE+ | 12-bit, 1MSPS, internal reference, 10-pin µMAX, ±1 LSB INL, no pseudo-differential mode | Higher speed and integrated reference simplify design but consume 2.5mA active current and lack CH−-based noise rejection | Prefer for high-throughput systems where common-mode noise immunity is less critical than sampling rate |
Compared with ADS7822U and MAX11100ETE+, the MAX159ACPA+ offers unique pseudo-differential input capability and ultra-low shutdown current in a compact 8-pin µMAX, making it optimal for space-constrained, battery-operated systems requiring robust noise rejection without added support components.
Availability
MAX159ACPA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, isolated data acquisition, medical patient monitoring, and process-control sensor interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX159ACPA+ 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 MAX159ACPA+ belongs to Maxim's low-power serial ADC product line, engineered specifically for portable and isolated measurement systems where accuracy, size, and micropower operation are jointly critical.
FAQ
What is the input configuration supported by the MAX159ACPA+?
The MAX159ACPA+ supports pseudo-differential analog input: CH+ (pin 2) is the sampled signal node, while CH− (pin 3) serves as a stable reference that must remain within ±0.5 LSB of GND during conversion. This architecture rejects common-mode noise without requiring matched differential drivers, distinguishing it from true differential or single-ended ADCs like the MAX157.
Does the MAX159ACPA+ require an external reference voltage?
Yes, the MAX159ACPA+ requires an external reference voltage applied to the REF pin (pin 5). The reference must deliver ≥250µA DC load current with ≤10Ω output impedance and be bypassed with a 0.1µF capacitor. The device accepts reference voltages from 0V to (VDD + 50mV), though optimal performance is achieved with 2.5V references.
How does the MAX159ACPA+ enter and exit shutdown mode?
The MAX159ACPA+ enters shutdown automatically when CS/SHDN (pin 6) is pulled high, reducing supply current to <0.2µA. It exits shutdown on the falling edge of CS/SHDN, with a guaranteed wake-up time of 2.5µs if the external reference is stable within 1 LSB; otherwise, longer stabilization time is required before valid conversion.
What serial interface protocols is the MAX159ACPA+ compatible with?
The MAX159ACPA+ is fully compatible with SPI, QSPI, and MICROWIRE protocols. It uses CPOL = 0 and CPHA = 0 timing, with data valid on the SCLK falling edge and sampled on the rising edge. Its 3-wire interface (CS/SHDN, SCLK, DOUT) eliminates the need for a separate MISO/MOSI pair, simplifying microcontroller integration.
What is the significance of the 8-pin µMAX package for the MAX159ACPA+?
The 8-pin µMAX package (3mm × 3mm) gives the MAX159ACPA+ a compact footprint ideal for space-constrained designs such as handheld instruments and wearable sensors. Its exposed thermal pad improves power dissipation, and the package is rated for 0°C to +70°C operation-matching commercial-grade requirements for cost-sensitive, high-volume applications.
MAX159ACPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 108k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- 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:
- -
MAX159ACPA+ FAQ
1.How can I place an order for MAX159ACPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX159ACPA+ 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 MAX159ACPA+ reliable?
The price and inventory of MAX159ACPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX159ACPA+ is usually 5 days.
3.What payment methods are accepted for MAX159ACPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX159ACPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX159ACPA+?
MAX159ACPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX159ACPA+ 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 MAX159ACPA+?
For technical support, including MAX159ACPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX159ACPA+ requirements.
6.How does Aetrix verify that MAX159ACPA+ is sourced from the original manufacturer or authorized distributors?
All MAX159ACPA+ 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 MAX159ACPA+ meets industry standards.
7.What is the process for return or replacement of MAX159ACPA+?
All MAX159ACPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX159ACPA+, 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 MAX159ACPA+ part is unused and in its original packaging.
Return procedure for MAX159ACPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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