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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:3,217
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Product details
Overview
MAX1081AEUP 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 low-power portable instrumentation.
For engineers reviewing the MAX1081AEUP datasheet, MAX1081AEUP pinout, MAX1081AEUP application, or MAX1081AEUP equivalent, this page delivers verified electrical specs, TSSOP-20 pin mapping, real-world use cases in battery-powered data acquisition, and two validated alternative ADCs for similar low-voltage, multi-channel sampling roles.
Technical Context
The MAX1081AEUP employs successive-approximation register (SAR) architecture with an on-chip track/hold and 8:1 analog multiplexer. Its conversion timing is synchronized to an external 4.8MHz serial clock, requiring 16 clock cycles per 10-bit result, and features four programmable power modes - normal, reduced-power (1.3mA), fast power-down (0.9mA), and full power-down (2µA).
It uses a flexible 4-wire SPI/QSPI/MICROWIRE-compatible serial interface with CS, SCLK, DIN, and DOUT, plus dedicated SSTRB strobe output for TMS320-family DSP synchronization. Input configuration is controlled via an 8-bit software command byte defining channel selection, input mode, and power state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes over full-scale range |
| Sampling Rate | 300ksps - supports up to 300,000 conversions per second at 4.8MHz SCLK |
| Supply Voltage | +2.7V to +3.6V - enables direct integration into 3V battery-powered systems without LDO overhead |
| INL / DNL | ±0.5 LSB / ±1.0 LSB - ensures monotonicity and <0.05% full-scale linearity error across temperature |
| Reference | Internal +2.500V ±1.5% - eliminates external reference component while supporting REFADJ trimming |
| Power Modes | Full power-down draws 2µA - allows microamp-level sleep between conversions in duty-cycled sensing |
| Input Channels | 8 single-ended or 4 pseudo-differential - provides flexible signal routing without external mux IC |
Pinout & Package
MAX1081AEUP is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP) with 0.65mm pitch, rated for -40°C to +85°C operation. The package is RoHS-compliant and thermally optimized for compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Support software-selectable single-ended or pseudo-differential pairing (e.g., CH0/CH1); each requires stable COM reference |
| COM (Pin 9) | Common-mode reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5LSB during conversion |
| SHDN (Pin 10) | Hardware shutdown control | Active-low input; pulls supply current to 2µA typical when asserted, independent of serial interface state |
| REF (Pin 11) | Reference buffer output / external ref input | Supplies 2.500V nominal internal reference; accepts 1V–VDD1 external 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 | Single ground plane required; separates noise-sensitive analog section from digital I/O |
| DOUT (Pin 14) | Serial data output | 3-state output enabled only when CS is low; MSB-first 10-bit result shifted out on SCLK rising edge |
| SSTRB (Pin 15) | Serial strobe output | Pulses high for one SCLK period before MSB appears on DOUT - synchronizes TMS320 DSP capture timing |
| DIN (Pin 16) | Serial data input | Accepts 8-bit control byte defining channel, input mode, and power state; sampled on SCLK rising edge |
| CS (Pin 17) | Chip select | Active-low enable; disables DOUT/SSTRB and places device in high-impedance state when high |
| SCLK (Pin 18) | Serial clock input | Drives conversion timing and data transfer; 4.8MHz max frequency defines 300ksps throughput |
| VDD2 (Pin 19) | Digital supply | Provides power to serial interface and logic; must be tied to VDD1 for single-supply operation |
| VDD1 (Pin 20) | Analog supply | Primary supply for analog core, T/H, and reference; must be clean and decoupled with 4.7µF + 0.01µF |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold + 8:1 multiplexer | Eliminates need for external sample-hold or analog switch ICs in multi-sensor monitoring systems |
| Software-configurable input modes | Single control byte selects unipolar/bipolar and single-ended/pseudo-differential operation per conversion |
| Four selectable power modes | Enables dynamic power scaling - e.g., FULLPD between samples cuts average current below 100µA at 1ksps |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | Direct connection to common microcontrollers and DSPs without level shifters or glue logic |
| Internal +2.5V reference with REFADJ | Reduces BOM count and layout area; ±1.5% adjustability supports calibration for precision applications |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 100Hz intervals. IC Role / Device Role / Timing Role: ADC front-end digitizing multiple analog sensor outputs with minimal power overhead and no external reference. Use Value: 2µA full power-down current extends coin-cell life beyond 2 years; 300ksps headroom supports burst-mode diagnostics. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with patient isolation and low-noise amplification. IC Role / Device Role / Timing Role: Pseudo-differential ADC converting amplified biopotential signals while rejecting common-mode interference from mains coupling. Use Value: ±0.5 LSB INL ensures accurate amplitude measurement of microvolt-level cardiac waveforms; COM stability requirement guides PCB grounding strategy. |
| Battery-Powered Instruments | Process Control Sensors |
Use Scenario: Field-deployable pH/ORP meter using electrochemical probes powered by two AA cells. IC Role / Device Role / Timing Role: Single-supply ADC interfacing with rail-to-rail op-amps and compensating for battery voltage sag during measurement cycles. Use Value: +2.7V to +3.6V operating range matches alkaline battery discharge curve; internal reference avoids drift from supply variation. |
Use Scenario: Industrial 4–20mA loop-powered transmitter measuring thermocouple or RTD outputs in hazardous locations. IC Role / Device Role / Timing Role: Low-power, isolated ADC capturing calibrated analog process variables for HART communication. Use Value: 8-channel capability supports multi-point temperature profiling; 3MHz full-power bandwidth accommodates fast thermal transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, multi-channel, low-voltage ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200ksps, +2.7V to +5.25V supply, no internal reference | Limited to lower-precision industrial controls where 8-bit quantization suffices | Select when cost sensitivity outweighs resolution needs and external reference is acceptable |
| MAX11100ETE+ | 12-bit resolution, 500ksps, +2.7V to +3.6V supply, internal 2.048V reference, 12-channel | Higher precision and channel count for upgraded medical or test equipment | Choose when system requires >10-bit ENOB and additional analog inputs without increasing board area |
Compared with MAX1081AEUP, ADS7822U trades resolution and reference integration for lower unit cost, while MAX11100ETE+ offers higher resolution and channel density at increased power and price - making MAX1081AEUP optimal for cost-constrained, 10-bit portable instrumentation.
Availability
MAX1081AEUP is available at Aetrix Electronics and suitable for portable data logging, battery-powered instruments, and medical instrumentation 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 demanding industrial, medical, and communications applications.
The MAX1080/MAX1081 family was engineered for low-power, multi-channel data acquisition in space- and energy-constrained systems - emphasizing single-supply operation, integrated reference, and flexible serial interfacing without external support components.
FAQ
What is the maximum sampling rate supported by the MAX1081AEUP?
The MAX1081AEUP supports a maximum sampling rate of 300ksps, achieved when operated with a 4.8MHz serial clock and configured for standard 16-clock conversions. This rate is guaranteed across its full operating temperature range of -40°C to +85°C and supply range of +2.7V to +3.6V. At lower clock frequencies, the sampling rate scales linearly - for example, a 2.4MHz SCLK yields ~150ksps throughput. The MAX1081AEUP does not support oversampling or decimation modes.
Does the MAX1081AEUP require an external reference voltage?
No, the MAX1081AEUP does not require an external reference voltage because it integrates a precision +2.500V ±1.5% reference buffer. This internal reference can be used directly or adjusted via the REFADJ pin for calibration. An external reference (1V to VDD1) may be applied to the REF pin only if the internal buffer is disabled by connecting REFADJ to VDD1 - a configuration that forfeits the internal reference's temperature stability and trim capability.
How does the pseudo-differential input mode work on the MAX1081AEUP?
The MAX1081AEUP implements pseudo-differential input by sampling only the positive input (IN+) while holding the negative input (IN-) stable at a fixed reference (e.g., COM or paired channel). Valid pairs are CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. Unlike true differential ADCs, the IN- node is not actively sampled; it must remain stable within ±0.5LSB during conversion to avoid error. This architecture reduces pin count and complexity while retaining common-mode rejection for moderate-noise environments.
What power-saving features does the MAX1081AEUP offer?
The MAX1081AEUP provides 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 bits in the 8-bit command byte. Critically, the device automatically wakes from any power-down state upon CS assertion and completes conversion within microseconds - enabling aggressive duty cycling in battery-operated systems without sacrificing responsiveness.
Is the MAX1081AEUP pin-compatible with other devices in the MAX1080/MAX1081 family?
Yes, the MAX1081AEUP is pin-compatible with all variants in the MAX1080/MAX1081 family, including MAX1080ACUP, MAX1080BCUP, MAX1080AEUP, MAX1081ACUP, and MAX1081BCUP. All share identical 20-pin TSSOP packaging, pin functions, and footprint. Differences lie solely in performance grade (A/B grade INL/DNL), temperature range (-40°C to +85°C for AEUP), and supply voltage range (+2.7V to +3.6V for MAX1081 vs. +4.5V to +5.5V for MAX1080), allowing drop-in substitution where voltage and spec compliance align.
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:
- 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:
- -
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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