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Analog Devices Inc./Maxim Integrated MAX1081ACUP
- Part No.:
- MAX1081ACUP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1081ACUP.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,068
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Product details
Overview
MAX1081ACUP from Maxim Integrated is a 10-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, multiplexer, and internal +2.5V reference. It operates from a single +2.7V to +3.6V supply, achieves 300ksps sampling rate, supports software-configurable unipolar/bipolar and single-ended/pseudo-differential inputs, and targets battery-powered data acquisition systems.
For engineers reviewing the MAX1081ACUP datasheet, MAX1081ACUP pinout, MAX1081ACUP application, or MAX1081ACUP equivalent, key selection criteria include its low-power operation (2.5mA at 300ksps), TSSOP-20 package compatibility, SPI/QSPI/MICROWIRE interface timing, and ±0.5LSB INL performance over 0°C to +70°C.
Technical Context
The MAX1081ACUP employs successive-approximation architecture with an on-chip track/hold and 8:1 analog multiplexer. Its pseudo-differential input structure samples only the positive channel (IN+) while referencing the negative side (IN−) to COM or paired channels-requiring IN− stability within ±0.5LSB during conversion.
It uses an external serial clock (up to 4.8MHz) for timing control and supports four power modes: normal (2.5mA), reduced-power (1.3mA), fast power-down (0.9mA), and full power-down (2µA). The internal reference buffer provides ±1.5% adjustability via REFADJ, and external reference operation is supported from 1.0V to VDD1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital output levels per conversion cycle |
| Sampling Rate | 300ksps - supports real-time capture of signals up to 150kHz Nyquist bandwidth |
| INL | ±0.5 LSB - ensures monotonicity and <0.05% full-scale linearity error after calibration |
| Supply Voltage | +2.7V to +3.6V - enables direct integration into 3.3V logic and battery-powered systems |
| Reference | Internal +2.5V ±1.5% adjustable - eliminates need for external reference in most portable applications |
| Power Modes | Four software-selectable states - allows dynamic current scaling from 2.5mA to 2µA based on sampling duty cycle |
| Interface | 4-wire SPI/QSPI/MICROWIRE-compatible - connects directly to microcontrollers without level-shifting or glue logic |
Pinout & Package
MAX1081ACUP is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP) with 0.65mm pitch, optimized for compact PCB layouts and thermal performance in portable instruments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Eight single-ended or four pseudo-differential input paths selectable via control byte |
| COM (Pin 9) | Common Reference Node | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5LSB during conversion |
| SHDN (Pin 10) | Hardware Shutdown Control | Active-low signal reduces supply current to 2µA; overrides software power modes |
| REF (Pin 11) | Reference Output/Input | Provides 2.500V internal reference or accepts external 1.0V–VDD1 reference when REFADJ = VDD1 |
| REFADJ (Pin 12) | Reference Buffer Adjustment | Enables ±1.5% fine-tuning of internal reference; disable buffer by tying to VDD1 |
| GND (Pin 13) | Analog/Digital Ground | Common return for analog and digital sections; requires low-impedance PCB connection |
| DOUT (Pin 14) | Serial Data Output | 3-state output delivering 10-bit result MSB-first; high-impedance when CS is high |
| SSTRB (Pin 15) | Serial Strobe Output | Pulses high one SCLK period before MSB appears on DOUT-synchronizes DSP capture |
| DIN (Pin 16) | Serial Data Input | Accepts 8-bit control byte defining channel, polarity, and power mode on SCLK rising edge |
| CS (Pin 17) | Chip Select | Active-low enable for serial interface; disables DOUT/SSTRB when high |
| SCLK (Pin 18) | Serial Clock Input | Drives conversion timing and data transfer; 4.8MHz max frequency defines 300ksps rate |
| VDD2 (Pin 19) | Digital Supply | Supplies digital core and interface; must match VDD1 within ±0.3V |
| VDD1 (Pin 20) | Analog Supply | Supplies analog front-end and reference; decoupling required per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel multiplexer + track/hold | Reduces external component count and board space vs. discrete ADC + MUX + T/H solutions |
| Software-configurable input modes | Single control byte selects unipolar/bipolar and single-ended/pseudo-differential operation per conversion |
| Internal +2.5V reference with ±1.5% adjustability | Eliminates external reference IC and trimmer potentiometer in cost-sensitive designs |
| Four power management modes | Enables sub-µA average current in burst-sampling applications via automatic wake-on-CS activation |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | Direct interfacing to common microcontrollers and DSPs without protocol translation logic |
Applications
| Portable Data Logging | Data Acquisition |
|---|---|
Use Scenario: Battery-operated environmental sensor node recording temperature, humidity, and pressure at 100Hz intervals. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple analog sensor outputs with minimal power overhead between samples. Use Value: 2µA full power-down current extends battery life to >2 years on two AA cells; 300ksps headroom supports oversampling for noise reduction. | Use Scenario: Industrial PLC module acquiring 8 analog process signals (4–20mA, thermocouple, RTD) with local preprocessing. IC Role / Device Role / Timing Role: High-channel-count, low-latency ADC enabling synchronized multi-channel sampling in deterministic control loops. Use Value: ±0.5LSB INL and 300ksps throughput ensure accurate closed-loop feedback without external calibration across temperature. |
| Medical Instruments | Battery-Powered Instruments |
Use Scenario: Handheld ECG monitor capturing lead-II differential signals with motion artifact rejection. IC Role / Device Role / Timing Role: Pseudo-differential ADC rejecting common-mode noise from body coupling while maintaining DC accuracy. Use Value: COM-referenced architecture and ±0.5LSB offset matching between CH pairs reduce baseline drift in low-frequency biopotential measurement. | Use Scenario: Field-deployable multimeter measuring AC/DC voltage, current, and resistance with auto-ranging. IC Role / Device Role / Timing Role: Flexible-input ADC supporting bipolar ranges and programmable gain via external op-amp configuration. Use Value: Software-selectable unipolar/bipolar mode and 2.7–3.6V operation allow seamless integration with Li-ion battery supply and precision front-end amplifiers. |
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 | 8-channel, 12-bit, 200ksps, +2.7V to +5.25V supply, no internal reference | Higher resolution but lower speed; requires external reference and higher supply headroom | Choose for precision DC measurements where 12-bit resolution outweighs speed and power penalties |
| MAX11100ETE+ | 8-channel, 10-bit, 500ksps, +2.7V to +3.6V, internal 2.048V reference, TQFN-16 | Faster sampling and smaller package, but fixed 2.048V reference limits full-scale range flexibility | Choose for space-constrained designs needing higher throughput and simplified layout, accepting fixed reference voltage |
Compared with ADS7822U and MAX11100ETE+, the MAX1081ACUP offers balanced 300ksps speed, adjustable 2.5V reference, and proven low-power operation across 0°C to +70°C-making it optimal for portable instrumentation requiring design flexibility and long battery life.
Availability
MAX1081ACUP is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply and guaranteed industrial temperature compliance.
Supply support for MAX1081ACUP 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 portable applications.
The MAX1080/MAX1081 family was engineered for low-power, multi-channel data acquisition in space- and energy-constrained systems-emphasizing integrated functionality, flexible input configuration, and robust serial interface compatibility.
FAQ
What is the maximum sampling rate of the MAX1081ACUP?
The MAX1081ACUP achieves a maximum sampling rate of 300ksps under specified conditions: VDD1 = VDD2 = +2.7V to +3.6V, fSCLK = 4.8MHz, 50% duty cycle, and 16 clocks per conversion cycle. This rate is validated across the full operating temperature range (0°C to +70°C) and supports real-time capture of signals up to 150kHz bandwidth.
Does the MAX1081ACUP require an external reference voltage?
No, the MAX1081ACUP includes an internal +2.500V reference with ±1.5% adjustability via the REFADJ pin. An external reference from 1.0V to VDD1 may be used instead by disabling the internal buffer-achieved by connecting REFADJ to VDD1. Both configurations are fully supported and characterized in the datasheet.
How does the pseudo-differential input mode work on the MAX1081ACUP?
In pseudo-differential mode, the MAX1081ACUP samples only the positive input (IN+) while referencing the negative input (IN−) to a stable node-either COM or a paired channel (e.g., CH0/CH1). The IN− node must remain stable within ±0.5LSB during conversion; any variation introduces measurable error. Channel pairing is controlled via the 3-bit SEL field in the 8-bit control byte.
What power-saving features does the MAX1081ACUP offer?
The MAX1081ACUP provides four software-selectable power modes: normal (2.5mA), reduced-power (1.3mA), fast power-down (0.9mA), and full power-down (2µA). Accessing the serial interface automatically wakes the device from any power-down state, and the quick turn-on time enables shut-down between consecutive conversions-reducing average current significantly at lower sampling rates.
Is the MAX1081ACUP pin-compatible with other devices in the MAX1080/MAX1081 family?
Yes, all MAX1080/MAX1081 variants-including MAX1081ACUP, MAX1081BCUP, and MAX1080x series-are pin-compatible in the 20-pin TSSOP package. Differences lie in temperature grade (CUP = 0°C to +70°C), initial accuracy (A-grade vs. B-grade), and supply voltage range (MAX1081 = +2.7V to +3.6V; MAX1080 = +4.5V to +5.5V), not pin function or layout.
MAX1081ACUP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 300k
- Number of Inputs:
- 4, 8
- Input Type:
- Pseudo-Differential, 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, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1081ACUP FAQ
1.How can I place an order for MAX1081ACUP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1081ACUP 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 MAX1081ACUP reliable?
The price and inventory of MAX1081ACUP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1081ACUP is usually 5 days.
3.What payment methods are accepted for MAX1081ACUP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1081ACUP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1081ACUP?
MAX1081ACUP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1081ACUP 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 MAX1081ACUP?
For technical support, including MAX1081ACUP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1081ACUP requirements.
6.How does Aetrix verify that MAX1081ACUP is sourced from the original manufacturer or authorized distributors?
All MAX1081ACUP 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 MAX1081ACUP meets industry standards.
7.What is the process for return or replacement of MAX1081ACUP?
All MAX1081ACUP units undergo pre-shipment inspection (PSI). If there is an issue with MAX1081ACUP, 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 MAX1081ACUP part is unused and in its original packaging.
Return procedure for MAX1081ACUP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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