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Analog Devices Inc./Maxim Integrated MAX1081AEUP+
- Part No.:
- MAX1081AEUP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1081AEUP+.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,650
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Product details
Overview
MAX1081AEUP+ from Maxim Integrated is a 10-bit, 8-channel serial analog-to-digital converter (ADC) operating from a single +2.7V to +3.6V supply, delivering 300ksps sampling rate with ±0.5 LSB INL and internal +2.5V reference. It integrates an analog multiplexer, track/hold circuit, and SPI/QSPI/MICROWIRE-compatible 4-wire serial interface - designed for precision data acquisition in battery-powered medical instruments and portable data loggers.
For engineers reviewing the MAX1081AEUP+ datasheet, MAX1081AEUP+ pinout, MAX1081AEUP+ application, or MAX1081AEUP+ equivalent, this page delivers verified electrical specs, thermal performance across –40°C to +85°C, power-mode behavior (2.5mA normal / 2µA full power-down), and real-world interface timing for TMS320 DSP integration and low-noise signal chain design.
Technical Context
The MAX1081AEUP+ uses successive-approximation architecture with a switched-capacitor DAC and integrated track/hold. Its pseudo-differential input structure supports four differential channel pairs (CH0/CH1 through CH6/CH7) while sampling only the positive input - requiring stable COM or IN– reference within ±0.5 LSB during conversion.
It features software-configurable unipolar/bipolar operation, four selectable power modes (normal, REDP, FASTPD, FULLPD), and automatic wake-on-CS activation. The internal reference buffer provides ±1.5% adjustment range via REFADJ, and external reference support extends input range to 1V–VDD1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for medium-precision sensor digitization. |
| Sampling Rate | 300ksps - enables capture of signals up to 150kHz Nyquist bandwidth in baseband applications. |
| INL | ±0.5 LSB - ensures monotonicity and <0.05% full-scale linearity error after calibration. |
| Supply Voltage | +2.7V to +3.6V - compatible with Li-ion and 3.3V system rails without level-shifting. |
| Power Consumption | 2.5mA at 300ksps - allows continuous acquisition in portable instruments with >100-hour battery life at 1ksps duty cycling. |
| Reference | Internal +2.5V ±1.5% adjustable - eliminates external reference IC, reducing BOM count and layout area. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive cabin-edge environments. |
Pinout & Package
MAX1081AEUP+ is housed in a 20-pin TSSOP package (4.4mm × 6.5mm, 0.65mm pitch), thermally optimized for compact PCB layouts and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Eight single-ended inputs or four pseudo-differential pairs; input capacitance 18pF limits source impedance to ≤4kΩ for full AC performance. |
| COM (Pin 9) | Common-Mode Reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5 LSB relative to GND during conversion. |
| SHDN (Pin 10) | Hardware Shutdown Control | Active-low input reduces supply current to 2µA; overrides software power modes for emergency low-power state. |
| REF (Pin 11) | Reference Output/Input | Supplies 2.500V ±20mV internal reference; accepts external 1V–VDD1 reference when REFADJ = VDD1. |
| REFADJ (Pin 12) | Reference Buffer Adjustment | Allows ±1.5% fine-tuning of internal reference; bypass capacitor ≥0.01µF required for stability. |
| GND (Pin 13) | Analog/Digital Ground | Single ground plane required; separation from noisy digital returns prevents INL degradation. |
| DOUT (Pin 14) | Serial Data Output | MSB-first, SPI-compatible output; high-impedance when CS is high - enables bus sharing. |
| SSTRB (Pin 15) | Serial Strobe Output | Pulses high one SCLK period before MSB appears on DOUT - synchronizes TMS320-family DSP capture timing. |
| DIN (Pin 16) | Serial Data Input | Accepts 8-bit control byte defining channel, polarity, and power mode; latched on SCLK rising edge. |
| CS (Pin 17) | Chip Select | Active-low enable; asserts serial interface and powers up device from power-down modes on falling edge. |
| SCLK (Pin 18) | Serial Clock Input | Accepts 0.5–4.8MHz clock; 50% duty cycle required; controls conversion speed and interface timing margins. |
| VDD2 (Pin 19) | Digital Supply | +2.7V to +3.6V rail powering logic and interface; must be within ±0.3V of VDD1. |
| VDD1 (Pin 20) | Analog Supply | +2.7V to +3.6V rail powering ADC core and reference; decoupling ≥4.7µF at REF mandatory. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel analog multiplexer + track/hold | Reduces external signal conditioning components; supports channel scanning at 300ksps aggregate rate. |
| Software-configurable unipolar/bipolar mode | Enables flexible sensor interfacing (e.g., thermocouples vs. RTDs) without hardware changes. |
| Four power modes (FULLPD = 2µA) | Permits adaptive power management - e.g., FULLPD between samples in 1ksps data loggers. |
| SPI/QSPI/MICROWIRE/TMS320-compatible interface | Eliminates protocol translation logic; direct connection to C2000 and C5000 DSP families via SSTRB sync pulse. |
| Internal +2.5V reference with ±1.5% adjustability | Removes need for external reference IC and trimming resistors - cuts BOM cost and board space by ~30%. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous ECG waveform digitization in handheld patient monitors with 3.3V Li-ion supply. IC Role / Device Role / Timing Role: Primary ADC capturing 12-bit-equivalent clinical waveforms at 1ksps using pseudo-differential CH0/CH1 pair and internal reference. Use Value: 300ksps headroom enables oversampling for noise reduction; 2.5mA active current extends battery life beyond 72 hours. |
Use Scenario: Environmental parameter logging (temperature, humidity, pressure) in remote field nodes. IC Role / Device Role / Timing Role: Multi-sensor hub ADC scanning eight channels every 10 seconds, entering FULLPD between reads. Use Value: 2µA shutdown current minimizes quiescent drain; single-supply operation avoids dual-rail regulators. |
| Industrial Process Monitoring | Pen Digitizer Signal Acquisition |
|
Use Scenario: Analog feedback loop sampling in PLC I/O modules deployed in factory automation cabinets. IC Role / Device Role / Timing Role: High-accuracy 10-bit digitization of 4–20mA transducer outputs with bipolar input configuration. Use Value: ±0.5 LSB INL ensures compliance with IEC 61000-4-5 surge immunity requirements for measurement integrity. |
Use Scenario: X/Y coordinate sampling in active stylus digitizers for tablets and signature pads. IC Role / Device Role / Timing Role: Low-latency acquisition of pen tip position signals from resistive overlay sensors at 200Hz update rate. Use Value: 625ns track/hold acquisition time supports fast pen movement without positional smearing. |
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 REF and REFBUF. | Lacks integrated reference and power modes - demands additional components for same functionality. | Choose when external reference precision >2.5V ±0.5% is required or when legacy ADS78xx firmware compatibility is critical. |
| MAX11100ETE+ | 12-bit resolution; 500ksps; +2.7V–3.6V; internal 2.048V reference; 16-pin TQFN. | Higher resolution but no SSTRB output - incompatible with TMS320 DSP sync timing. | Prefer when SNR >70dB is mandatory and DSP co-synchronization is not needed. |
Compared with MAX1081AEUP+, ADS7822U increases component count and layout complexity due to missing reference and power control, while MAX11100ETE+ trades deterministic DSP synchronization for higher resolution - making MAX1081AEUP+ optimal for cost-sensitive, DSP-coupled, battery-operated systems needing proven 10-bit linearity.
Availability
MAX1081AEUP+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1081AEUP+ 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 industrial, medical, and communications applications - emphasizing integration, reliability, and low-power operation.
The MAX1080/MAX1081 family was engineered to replace multi-chip ADC solutions in space-constrained, battery-sensitive systems - combining multiplexing, track/hold, reference, and serial interface into a single 20-pin TSSOP device.
FAQ
What is the maximum sampling rate supported by the MAX1081AEUP+?
The MAX1081AEUP+ supports a maximum sampling rate of 300ksps under specified conditions: VDD1/VDD2 = +2.7V to +3.6V, fSCLK = 4.8MHz, and bipolar input mode. This rate is guaranteed across the full –40°C to +85°C operating temperature range and enables accurate digitization of signals up to 150kHz using Nyquist criteria. The MAX1081AEUP+ achieves this performance while maintaining ±0.5 LSB INL and 60dB SINAD.
Does the MAX1081AEUP+ include an internal voltage reference?
Yes, the MAX1081AEUP+ integrates a precision +2.500V ±20mV internal reference with ±1.5% adjustment range via the REFADJ pin. This eliminates the need for an external reference IC in most applications. When higher accuracy is required, an external reference from 1V to VDD1 can be applied to the REF pin by disabling the internal buffer - achieved by pulling REFADJ to VDD1. The MAX1081AEUP+'s reference buffer supports load regulation of ≤2mV/mA.
How does the power-down functionality work on the MAX1081AEUP+?
The MAX1081AEUP+ offers four software-selectable power modes: normal (2.5mA), reduced power (1.3mA), fast power-down (0.9mA), and full power-down (2µA). Power mode selection is controlled via two bits (PD1/PD0) in the 8-bit control byte sent to DIN. Additionally, the SHDN pin provides hardware override - pulling it low forces immediate entry into full power-down regardless of software state. The device automatically wakes on CS falling edge, with turn-on time short enough to allow power-down between consecutive conversions.
Can the MAX1081AEUP+ interface directly with TMS320-series DSPs?
Yes, the MAX1081AEUP+ supports direct connection to TMS320-family digital signal processors via its dedicated SSTRB (serial strobe) output. SSTRB pulses high for exactly one SCLK period immediately before the MSB of the conversion result appears on DOUT - providing precise timing alignment for DSP capture registers. No external glue logic is required, and the 4-wire SPI-compatible interface operates natively with C2000 and C5000 series devices when configured with CPOL = 0 and CPHA = 0.
What are the analog input configuration options for the MAX1081AEUP+?
The MAX1081AEUP+ supports both single-ended and pseudo-differential analog input configurations, selected via the SGL/DIF bit in the control byte. In single-ended mode, CH0–CH7 are referenced to COM; in pseudo-differential mode, inputs are paired as CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. Unlike true differential ADCs, only the positive input (IN+) is sampled - the negative input (IN–) must remain stable within ±0.5 LSB during conversion to maintain accuracy.
MAX1081AEUP+ 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:
- Active
- 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:
- -
MAX1081AEUP+ FAQ
1.How can I place an order for MAX1081AEUP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1081AEUP+ 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 MAX1081AEUP+ reliable?
The price and inventory of MAX1081AEUP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1081AEUP+ is usually 5 days.
3.What payment methods are accepted for MAX1081AEUP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1081AEUP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1081AEUP+?
MAX1081AEUP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1081AEUP+ 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 MAX1081AEUP+?
For technical support, including MAX1081AEUP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1081AEUP+ requirements.
6.How does Aetrix verify that MAX1081AEUP+ is sourced from the original manufacturer or authorized distributors?
All MAX1081AEUP+ 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 MAX1081AEUP+ meets industry standards.
7.What is the process for return or replacement of MAX1081AEUP+?
All MAX1081AEUP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1081AEUP+, 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 MAX1081AEUP+ part is unused and in its original packaging.
Return procedure for MAX1081AEUP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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