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Analog Devices Inc./Maxim Integrated MAX1081BEUP
- Part No.:
- MAX1081BEUP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1081BEUP.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,824
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Product details
Overview
MAX1081BEUP from Maxim Integrated is a 10-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, internal +2.5V reference, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.7V to +3.6V supply, delivers 300ksps sampling rate, and supports software-configurable unipolar/bipolar and single-ended/pseudo-differential inputs for portable data acquisition systems.
For engineers reviewing the MAX1081BEUP datasheet, MAX1081BEUP pinout, MAX1081BEUP application, or MAX1081BEUP equivalent, this page provides verified technical context, real-world design meanings of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support tailored for battery-powered instrumentation and medical device development.
Technical Context
The MAX1081BEUP uses successive-approximation register (SAR) architecture with an on-chip track/hold circuit that acquires input signals in ≤625ns. Its pseudo-differential input structure samples only the IN+ node while holding IN– stable, requiring ±0.5LSB stability at COM or selected negative channel during conversion.
It implements four software-selectable power modes-normal (2.5mA), reduced-power (1.3mA), fast power-down (0.9mA), and full power-down (2µA)-with automatic wake-up via serial interface activity. The internal reference buffer provides ±1.5% adjustment range and ±15ppm/°C temperature coefficient, supporting external reference use within 1V to VDD1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC output - delivers 1024 discrete digital codes over full-scale range. |
| Sampling Rate | 300ksps - enables accurate capture of signals up to 150kHz (Nyquist-limited) without aliasing in baseband applications. |
| Supply Voltage | +2.7V to +3.6V single supply - compatible with Li-ion and 3.3V system rails; eliminates dual-supply design complexity. |
| INL / DNL | ±0.5LSB / ±1.0LSB - ensures monotonicity and <0.05% full-scale linearity error after calibration, critical for precision sensor interfacing. |
| Reference | Internal +2.500V ±0.020V (±0.8%) - provides stable conversion基准 without external components; REFADJ allows ±1.5% fine-tuning. |
| Power Modes | Full power-down draws 2µA - reduces average current below 100µA at low duty-cycle sampling, extending battery life in portable instruments. |
| Input Configuration | 8 single-ended or 4 pseudo-differential channels - supports flexible signal routing with software-selectable unipolar/bipolar mode per conversion. |
Pinout & Package
MAX1081BEUP is housed in a 20-pin TSSOP package (4.4mm × 6.5mm, 0.65mm pitch), RoHS-compliant and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Selectable as positive inputs in single-ended mode or paired (CH0/CH1 etc.) as pseudo-differential inputs; each requires ≤4kΩ source impedance for full AC performance. |
| COM (Pin 9) | Common-mode reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5LSB during conversion to avoid gain/offset errors. |
| SHDN (Pin 10) | Hardware shutdown control | Active-low input; pulling low reduces supply current to 2µA (typ), enabling rapid system-level power gating. |
| REF (Pin 11) | Reference buffer output / external ref input | Supplies +2.500V (±0.8%) when internal reference enabled; accepts 1V to VDD1 external reference when REFADJ = VDD1. |
| REFADJ (Pin 12) | Reference buffer adjustment | Allows ±1.5% fine-tuning of internal reference voltage; connect to VDD1 to disable buffer and use external reference. |
| GND (Pin 13) | Analog/digital ground | Single ground plane required; separates noisier digital return paths from sensitive analog inputs to maintain SNR >60dB. |
| DOUT (Pin 14) | Serial data output | MSB-first 10-bit result shifted out on SCLK rising edge; high-impedance when CS is high to prevent bus contention. |
| SSTRB (Pin 15) | Serial strobe output | Pulses high for one SCLK period before MSB appears on DOUT - synchronizes DSP capture timing without external logic. |
| DIN (Pin 16) | Serial data input | Accepts 8-bit control byte (e.g., channel select, unipolar/bipolar config) on SCLK rising edge; leading '1' defines MSB start. |
| CS (Pin 17) | Chip select | Active-low enable; must be held low for entire 16-clock conversion cycle; high state places DOUT/SSTRB in high-Z. |
| SCLK (Pin 18) | Serial clock input | Drives conversion timing and data transfer; 4.8MHz max frequency sets 300ksps rate; 40–60% duty cycle required. |
| VDD2 (Pin 19) | Digital supply | Provides power to serial interface and logic; must be tied to VDD1 (±0.3V) to ensure proper level translation and noise isolation. |
| VDD1 (Pin 20) | Analog supply | Supplies analog core, T/H, and reference; decoupling with 4.7µF + 0.01µF at REF/REFADJ essential for ±0.5LSB accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold with ≤625ns acquisition time | Enables accurate sampling of fast transients without external TH circuitry; supports source impedances up to 4kΩ without AC performance loss. |
| Four software-selectable power modes | Reduces average current by >99% in full power-down mode, allowing microcontroller-driven burst sampling in battery-operated devices. |
| SPI/QSPI/MICROWIRE/TMS320-compatible interface | Eliminates protocol translation logic; direct connection to TI C2000 or STM32 SPI peripherals with CPOL=0/CPHA=0 configuration. |
| Internal +2.5V reference with ±1.5% adjustability | Removes need for external precision reference IC and trimming resistors, cutting BOM cost and PCB area in space-constrained designs. |
| Pseudo-differential input architecture | Provides common-mode rejection without matched external resistors; supports differential measurements using existing single-ended sensor outputs. |
Applications
| Portable Data Logging | Data Acquisition |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure every 10 seconds. IC Role / Device Role / Timing Role: ADC front-end digitizing multiple analog sensor outputs with low quiescent current and software-triggered conversions. Use Value: Full power-down mode draws only 2µA between samples, extending 2xAA battery life beyond 2 years at 10s intervals. | Use Scenario: Industrial PLC module acquiring 8-channel analog process signals (4–20mA, 0–10V) in noisy factory environments. IC Role / Device Role / Timing Role: Precision SAR ADC providing 10-bit resolution and ±0.5LSB INL for calibrated measurement accuracy across temperature. Use Value: Internal reference stability (±0.8% initial, ±15ppm/°C TC) eliminates drift-induced recalibration cycles in field-deployed units. |
| 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 converting CH0/CH1 pair with software-configurable bipolar range to accommodate ±2.5V ECG swing. Use Value: 300ksps sampling supports >100Hz bandwidth for diagnostic-quality waveform capture while maintaining >60dB SINAD. | Use Scenario: Portable multimeter measuring DC voltage, resistance, and continuity with auto-ranging and backlit LCD. IC Role / Device Role / Timing Role: Low-power 10-bit ADC performing rapid channel scans of internal reference dividers and input attenuators. Use Value: Reduced-power mode (1.3mA) enables continuous display refresh and button polling without depleting CR2032 coin cell in under 6 months. |
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 | 2.7V–5.25V supply, 200ksps, no internal reference, requires external 2.5V ref; 8-pin SOIC package. | Lacks integrated reference and track/hold; needs external op-amp buffering for high-Z sensors. | Choose when board space is constrained and external reference already exists in system. |
| MAX11100ETE+ | 12-bit resolution, 500ksps, +2.7V–3.6V supply, internal 2.048V ref, 16-pin TQFN package. | Higher resolution and speed but larger code footprint; different pinout and SPI timing requirements. | Choose when 12-bit precision and faster throughput justify layout redesign and firmware updates. |
Compared with ADS7822U, MAX1081BEUP reduces BOM count by integrating reference and track/hold, while MAX11100ETE+ trades simplicity for higher resolution-neither is pin-compatible, but both serve overlapping portable measurement use cases with distinct trade-offs in accuracy, power, and integration.
Availability
MAX1081BEUP is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply across industrial temperature ranges.
Supply support for MAX1081BEUP 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 automotive applications.
The MAX1080/MAX1081 family targets low-power, multi-channel data acquisition in space- and energy-constrained systems, emphasizing integration of reference, track/hold, and serial interface to minimize external components.
FAQ
What is the operating temperature range for MAX1081BEUP?
The MAX1081BEUP is specified for operation from –40°C to +85°C, making it suitable for industrial and medical environments where ambient conditions exceed commercial-grade limits. This rating matches the "E" grade suffix in the part number and is validated across all electrical parameters including INL, DNL, and reference stability.
Does MAX1081BEUP require an external reference?
No, MAX1081BEUP includes an internal +2.500V reference with ±0.8% initial accuracy and ±15ppm/°C temperature coefficient. An external reference can be used by disabling the internal buffer via REFADJ = VDD1, but it is not required for standard operation.
How does the pseudo-differential mode work on MAX1081BEUP?
In pseudo-differential mode, MAX1081BEUP samples only the IN+ node (e.g., CH0) while holding IN– (e.g., CH1) stable at a fixed voltage. The conversion result represents the difference (IN+ − IN–), but IN– must remain within ±0.5LSB of its setpoint during acquisition to avoid error-unlike true differential ADCs, it does not sample both nodes simultaneously.
What power modes does MAX1081BEUP support and how are they controlled?
MAX1081BEUP supports four power modes: normal (2.5mA), reduced-power (1.3mA), fast power-down (0.9mA), and full power-down (2µA). They are selected via two bits (PD1/PD0) in the control byte written to DIN; SHDN pin provides hardware override for full power-down independent of serial commands.
Is MAX1081BEUP compatible with standard SPI interfaces?
Yes, MAX1081BEUP is fully compatible with SPI, QSPI, and MICROWIRE protocols. It requires CPOL = 0 and CPHA = 0 configuration; data is clocked in/out on SCLK rising edge, MSB-first, with CS active-low enabling. No level-shifting or timing glue logic is needed for direct connection to STM32, PIC, or TI MSP430 microcontrollers.
MAX1081BEUP 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1081BEUP FAQ
1.How can I place an order for MAX1081BEUP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1081BEUP 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 MAX1081BEUP reliable?
The price and inventory of MAX1081BEUP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1081BEUP is usually 5 days.
3.What payment methods are accepted for MAX1081BEUP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1081BEUP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1081BEUP?
MAX1081BEUP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1081BEUP 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 MAX1081BEUP?
For technical support, including MAX1081BEUP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1081BEUP requirements.
6.How does Aetrix verify that MAX1081BEUP is sourced from the original manufacturer or authorized distributors?
All MAX1081BEUP 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 MAX1081BEUP meets industry standards.
7.What is the process for return or replacement of MAX1081BEUP?
All MAX1081BEUP units undergo pre-shipment inspection (PSI). If there is an issue with MAX1081BEUP, 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 MAX1081BEUP part is unused and in its original packaging.
Return procedure for MAX1081BEUP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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