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Analog Devices Inc./Maxim Integrated MAX1081AEUP+T
- Part No.:
- MAX1081AEUP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1081AEUP+T.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,864
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Product details
Overview
MAX1081AEUP+T 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, delivers 300ksps sampling rate, supports software-configurable unipolar/bipolar and single-ended/pseudo-differential inputs, and targets battery-powered data acquisition in portable medical instruments and industrial sensors.
For engineers reviewing the MAX1081AEUP+T datasheet, MAX1081AEUP+T pinout, MAX1081AEUP+T application, or MAX1081AEUP+T equivalent, this page provides verified electrical parameters, TSSOP-20 pin mapping, real-world use cases, and two validated alternative parts for low-power, multi-channel ADC selection in space-constrained embedded systems.
Technical Context
The MAX1081AEUP+T uses successive-approximation register (SAR) architecture with an on-chip track/hold circuit and 8:1 analog multiplexer. Its input stage supports pseudo-differential operation across four channel pairs (CH0/CH1, CH2/CH3, etc.) while maintaining single-ended acquisition timing.
It features a 4-wire SPI/QSPI/MICROWIRE-compatible serial interface with SSTRB strobe output for TMS320-family DSP synchronization, and implements four software-selectable power modes - normal (2.5mA), reduced-power (1.3mA), fast power-down (0.9mA), and full power-down (2µA) - enabling dynamic current scaling between conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR conversion with no missing codes over temperature (MAX1081A grade) |
| Sampling Rate | 300ksps maximum - sets minimum 3.33µs conversion time at 4.8MHz SCLK |
| Supply Voltage | +2.7V to +3.6V single supply - enables direct integration with 3.3V logic and Li-ion battery rails |
| INL / DNL | ±0.5LSB integral nonlinearity and ±1.0LSB differential nonlinearity - ensures monotonicity and <0.05% full-scale error |
| Reference | Internal +2.500V ±1.5% adjustable reference with REFADJ pin - eliminates external reference component cost and layout area |
| Power Modes | Four software-controlled states: normal, REDP, FASTPD, FULLPD - allows sub-1µA quiescent current during idle intervals |
| Input Configuration | 8-channel single-ended or 4-channel pseudo-differential - supports flexible sensor interfacing without external signal conditioning |
Pinout & Package
MAX1081AEUP+T is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP) with 0.65mm pitch, JEDEC MO-153 compliant, and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Eight single-ended or four pseudo-differential inputs; each channel must remain within GND to VDD1 range |
| COM (Pin 9) | Common-mode reference | Sets zero-code voltage in single-ended mode; requires stability within ±0.5LSB for accuracy |
| SHDN (Pin 10) | Hardware shutdown control | Active-low input that reduces supply current to 2µA when asserted; independent of serial interface state |
| REF (Pin 11) | Reference buffer output / external reference input | Provides 2.500V nominal internal reference; accepts 1.0V to VDD1 external reference when REFADJ = VDD1 |
| REFADJ (Pin 12) | Reference adjustment terminal | Enables ±1.5% fine-tuning of internal reference; disable buffer by tying to VDD1 |
| GND (Pin 13) | Analog and digital ground | Single ground plane required; separation not recommended due to shared GND pin |
| DOUT (Pin 14) | Serial data output | 3-state output synchronized to SCLK rising edge; high-impedance when CS is high |
| SSTRB (Pin 15) | Serial strobe output | Pulses high for one SCLK period before MSB appears on DOUT - used for TMS320 DSP frame sync |
| DIN (Pin 16) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; first '1' bit defines MSB position |
| CS (Pin 17) | Chip select | Active-low enable for serial interface; disables DOUT/SSTRB outputs when high |
| SCLK (Pin 18) | Serial clock input | Drives conversion timing and data transfer; 0.5–4.8MHz range with 40–60% duty cycle |
| VDD2 (Pin 19) | Digital supply | Must be tied to VDD1; voltage mismatch >±0.3V violates absolute maximum rating |
| VDD1 (Pin 20) | Analog supply | +2.7V to +3.6V primary supply; powers analog front-end, reference, and digital core |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold and 8:1 multiplexer | Eliminates need for external sample-hold IC and analog switch, reducing BOM count and board area |
| Software-configurable input mode | Runtime selection of unipolar/bipolar and single-ended/pseudo-differential via control byte - enables flexible sensor interface without hardware change |
| Low-power operation down to 2µA | Full power-down mode cuts supply current to microamp level between conversions - extends battery life in portable logging devices |
| SPI/QSPI/MICROWIRE compatibility | Direct connection to microcontroller serial peripherals without level shifters or glue logic - simplifies firmware integration |
| Internal reference with ±1.5% adjustability | Reduces system cost and layout complexity vs. discrete reference ICs; REFADJ allows calibration trimming |
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: 10-bit ADC captures analog lead signals at 300ksps with pseudo-differential input to reject common-mode noise from body coupling. Use Value: Internal +2.5V reference and 2.5mA active current enable >24-hour runtime on 500mAh battery; TSSOP-20 footprint fits compact PCB layouts. |
Use Scenario: Environmental parameter recording (temperature, humidity, pressure) in field-deployed IoT nodes. IC Role / Device Role / Timing Role: Multi-channel ADC interfaces eight analog sensors sequentially, using software-configurable unipolar mode for RTD and thermistor bridges. Use Value: Four power modes allow deep sleep between hourly readings, reducing average current to <10µA; REFADJ enables factory calibration traceability. |
| Industrial Process Monitoring | Pen Digitizer Signal Acquisition |
|
Use Scenario: Analog feedback loop sampling in PLC I/O modules requiring isolation and precision. IC Role / Device Role / Timing Role: ADC digitizes 4–20mA transducer outputs via precision shunt resistor, using single-ended mode with COM referenced to isolated ground. Use Value: ±0.5LSB INL and ±1.0LSB DNL ensure <0.05% measurement linearity across 0–100°C operating range; 3MHz full-power bandwidth supports transient detection. |
Use Scenario: Position sensing in active stylus digitizers where pen tip voltage varies with proximity and pressure. IC Role / Device Role / Timing Role: High-speed 300ksps sampling captures rapid pen movement dynamics; pseudo-differential mode rejects noise from display EMI. Use Value: SSTRB strobe output synchronizes digitizer controller timing to ADC MSB arrival, eliminating sampling jitter in coordinate calculation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, multi-channel, low-power ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply, 200ksps, SPI-only interface, no internal reference | Requires external 2.5V reference and level-shifting for 3.3V systems; lacks SSTRB strobe for DSP sync | Choose when lower cost is critical and external reference is already present in design |
| MAX11100ETE+ | 12-bit resolution, 500ksps, +2.7V–3.6V supply, internal 2.048V reference, 16-TQFN | Higher resolution but larger code width; different pinout and package prevents drop-in replacement | Choose when 12-bit precision is required and PCB layout can accommodate TQFN-16 |
Compared with ADS7822U and MAX11100ETE+, the MAX1081AEUP+T offers optimal balance of 10-bit accuracy, 300ksps speed, integrated reference, and TSSOP-20 compatibility for space-constrained, battery-operated systems requiring deterministic timing via SSTRB.
Availability
MAX1081AEUP+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial process monitoring, and pen digitizer signal acquisition requiring stable component supply across extended temperature ranges.
Supply support for MAX1081AEUP+T 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.
The MAX1080/MAX1081 family was engineered for low-power, multi-channel data acquisition in portable and battery-operated equipment, emphasizing integration of reference, track/hold, and serial interface in a minimal footprint.
FAQ
What is the operating temperature range for MAX1081AEUP+T?
The MAX1081AEUP+T is specified for -40°C to +85°C operation, matching the "E" grade designation in its part number suffix. This extended industrial temperature range ensures reliable performance in outdoor instrumentation, automotive cabin sensors, and factory-floor controllers where ambient conditions exceed commercial limits. All electrical specifications in the datasheet are guaranteed across this full range.
Does MAX1081AEUP+T require an external reference voltage?
No, MAX1081AEUP+T includes an internal +2.500V ±1.5% reference with adjustable output via the REFADJ pin. An external reference (1.0V to VDD1) may be used only if the internal buffer is disabled by connecting REFADJ to VDD1. The internal reference eliminates BOM cost and layout area typically needed for discrete reference ICs, making MAX1081AEUP+T ideal for compact, cost-sensitive designs.
How does the power-down functionality work in MAX1081AEUP+T?
MAX1081AEUP+T supports four software-selectable power modes: normal (2.5mA), reduced-power (1.3mA), fast power-down (0.9mA), and full power-down (2µA). These are controlled via PD1/PD0 bits in the configuration register. In full power-down, supply current drops to 2µA while retaining register contents; serial interface access automatically wakes the device with fast turn-on time, enabling shut-down between every conversion to minimize average current in low-duty-cycle applications.
Can MAX1081AEUP+T interface directly with a TMS320 DSP?
Yes, MAX1081AEUP+T features a dedicated SSTRB (serial strobe) output that pulses high for one SCLK period before the MSB of the conversion result appears on DOUT. This strobe signal is explicitly designed for direct connection to TMS320-family DSPs to synchronize frame capture and eliminate sampling jitter. No external logic or timing circuitry is required - the interface is fully compatible with TI's C5000/C6000 serial port configurations.
What is the maximum source impedance supported for analog inputs on MAX1081AEUP+T?
MAX1081AEUP+T specifies a minimum track/hold acquisition time (tACQ) of 625ns. Using the formula tACQ = 7 × (RS + RIN) × 12pF with RIN = 800Ω, the maximum recommended source impedance is 4kΩ to maintain full AC performance. Source impedances below 4kΩ have negligible impact on SINAD or THD; higher impedances require longer inter-conversion delays or external buffering to meet timing and accuracy requirements.
MAX1081AEUP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX1081AEUP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1081AEUP+T 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+T reliable?
The price and inventory of MAX1081AEUP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1081AEUP+T is usually 5 days.
3.What payment methods are accepted for MAX1081AEUP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1081AEUP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1081AEUP+T?
MAX1081AEUP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1081AEUP+T 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+T?
For technical support, including MAX1081AEUP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1081AEUP+T requirements.
6.How does Aetrix verify that MAX1081AEUP+T is sourced from the original manufacturer or authorized distributors?
All MAX1081AEUP+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX1081AEUP+T?
All MAX1081AEUP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1081AEUP+T, 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+T part is unused and in its original packaging.
Return procedure for MAX1081AEUP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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