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Analog Devices Inc./Maxim Integrated MAX1081BCUP+T
- Part No.:
- MAX1081BCUP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1081BCUP+T.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,363
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Product details
Overview
MAX1081BCUP+T from Maxim Integrated is a 10-bit, 300ksps serial analog-to-digital converter with integrated 8-channel multiplexer, track/hold, and internal +2.5V reference. It operates from a single +2.7V to +3.6V supply, supports software-configurable unipolar/bipolar and single-ended/pseudo-differential inputs, and targets low-power portable instrumentation such as battery-powered data loggers and medical sensors.
For engineers reviewing the MAX1081BCUP+T datasheet, MAX1081BCUP+T pinout, MAX1081BCUP+T application, or MAX1081BCUP+T equivalent, this page delivers verified electrical specs, real-world timing behavior, power-mode trade-offs, and precise ADC interface guidance for embedded signal acquisition systems.
Technical Context
The MAX1081BCUP+T uses successive-approximation architecture with a switched-capacitor DAC and internal track/hold circuitry. 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, REDP, FASTPD, FULLPD) and features a 4-wire SPI/QSPI/MICROWIRE-compatible serial interface with SSTRB strobe output for TMS320-family DSP synchronization. Conversion is clocked by an external SCLK up to 4.8MHz, with 16 clocks per 10-bit result.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes across full-scale range |
| Sampling Rate | 300ksps - supports continuous acquisition of signals up to 150kHz Nyquist bandwidth |
| Supply Voltage | +2.7V to +3.6V - enables direct integration into 3.3V logic and battery-powered systems |
| INL / DNL | ±0.5 LSB / ±1.0 LSB - ensures monotonicity and <0.05% full-scale linearity error over temperature |
| Reference | Internal +2.500V ±1.5% - eliminates external reference component; adjustable via REFADJ pin |
| Power Consumption | 2.5mA (normal), 2µA (FULLPD) - allows duty-cycled operation to extend battery life in portable devices |
| Input Channels | 8 single-ended or 4 pseudo-differential - provides flexible sensor interfacing without external mux |
Pinout & Package
MAX1081BCUP+T is housed in a 20-pin TSSOP package (4.4mm × 6.5mm, 0.65mm pitch), optimized for compact PCB layouts and thermal performance in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Selectable as positive inputs in single-ended mode or paired as IN+/IN− in pseudo-differential mode |
| 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 signal reduces supply current to 2µA; overrides software power modes |
| REF (Pin 11) | Reference buffer output / external reference input | Supplies 2.500V nominal reference; accepts 1.0V to 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 and digital ground | Single ground plane required; separation not needed due to internal partitioning |
| 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-directly interfaces TMS320 DSPs |
| DIN (Pin 16) | Serial data input | Accepts 8-bit control byte defining channel, polarity, and power mode prior to conversion |
| 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; max 4.8MHz; 40–60% duty cycle required |
| VDD2 (Pin 19) | Digital supply | Must match VDD1; tolerance ±0.3V between supplies prevents latch-up |
| VDD1 (Pin 20) | Analog supply | +2.7V to +3.6V; powers analog core, T/H, and reference buffer |
Key Features
| Feature | Design Value |
|---|---|
| Pseudo-differential input architecture | Supports 4 differential pairs (CH0/CH1, CH2/CH3, etc.) while sampling only IN+, reducing noise coupling vs. true differential |
| Four software-selectable power modes | REDP (1.3mA), FASTPD (0.9mA), FULLPD (2µA) enable dynamic power scaling between conversions |
| Internal reference with ±1.5% adjustability | Eliminates external reference IC and trim components; REFADJ allows calibration to system-level accuracy requirements |
| SPI/QSPI/MICROWIRE/TMS320-compatible interface | Direct connection to microcontrollers and DSPs without level shifters or glue logic-reduces BOM and layout complexity |
| Track/hold acquisition time | 625ns minimum-enables accurate sampling of fast-rising transients with source impedances ≤4kΩ |
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 low quiescent current and software-triggered conversion sequencing. Use Value: 2.5mA normal-mode current and FULLPD mode reduce average power to <10µA at 1Hz sampling, extending AA battery life beyond 2 years. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with motion artifact rejection. IC Role / Device Role / Timing Role: Pseudo-differential ADC converting CH0/CH1 pair with COM referenced to right-leg drive, rejecting common-mode interference. Use Value: ±0.5LSB INL and 70dB SFDR preserve diagnostic waveform fidelity; 300ksps rate supports oversampling for digital filtering. |
| Battery-Powered Instruments | Process Control Sensors |
|
Use Scenario: Field-deployable pH/ORP meter operating from two AAA cells for industrial water quality testing. IC Role / Device Role / Timing Role: Single-supply ADC interfacing electrochemical sensor with programmable gain amplifier and internal reference. Use Value: +2.7V min supply allows operation down to 2.8V battery voltage; internal 2.5V reference maintains measurement consistency across battery discharge curve. |
Use Scenario: DIN-rail mounted temperature transmitter converting RTD/thermocouple signals to 4–20mA loop output. IC Role / Device Role / Timing Role: High-accuracy ADC digitizing conditioned analog inputs with offset/gain calibration stored in external EEPROM. Use Value: ±3.0LSB gain error and ±0.2LSB channel-to-channel offset matching ensure <0.1% total system error after calibration. |
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 | Lacks integrated reference and power-down modes-needs additional components for portable use | Choose when higher supply flexibility and lower cost outweigh need for internal reference and ultra-low-power modes |
| MAX11100ETE+ | 12-bit resolution; 500ksps; +2.7V–3.6V; internal 2.048V reference; SPI-only interface | Higher resolution and speed but larger 16-pin TQFN package and no SSTRB output for DSP sync | Choose when 12-bit precision and faster sampling are critical, and TQFN footprint and missing SSTRB are acceptable |
Compared with ADS7822U and MAX11100ETE+, the MAX1081BCUP+T uniquely balances 300ksps throughput, integrated reference adjustability, four power modes, and TMS320-compatible SSTRB-making it optimal for compact, battery-sensitive, DSP-linked acquisition systems where BOM count and firmware overhead matter.
Availability
MAX1081BCUP+T is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1081BCUP+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 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 integrated functionality, supply flexibility, and robust serial interfacing.
FAQ
What is the maximum sampling rate supported by the MAX1081BCUP+T?
The MAX1081BCUP+T supports a maximum sampling rate of 300ksps, achieved with a 4.8MHz SCLK and 16-clock conversion cycle. This rate is specified under conditions of +2.7V to +3.6V supply, bipolar input mode, and 75kHz sine-wave input. At lower clock frequencies or in reduced-power modes, the effective sampling rate decreases proportionally.
Does the MAX1081BCUP+T require an external reference voltage?
No-the MAX1081BCUP+T includes an internal +2.500V ±1.5% reference buffer. It can operate fully autonomously using this reference, or accept an external 1.0V to VDD1 reference applied to the REF pin when REFADJ is tied to VDD1 to disable the internal buffer. No external reference is required for basic operation.
How does the pseudo-differential input mode work on the MAX1081BCUP+T?
In pseudo-differential mode, the MAX1081BCUP+T selects IN+ and IN− from predefined channel pairs (e.g., CH0/CH1). Only IN+ is actively sampled by the track/hold; IN− remains held stable during conversion. The device computes the difference (IN+ − IN−), but IN− must stay within ±0.5LSB of its nominal value relative to GND to maintain accuracy-unlike true differential ADCs that sample both nodes.
What are the power consumption values for each operating mode of the MAX1081BCUP+T?
The MAX1081BCUP+T draws 2.5mA in normal mode, 1.3mA in reduced-power (REDP) mode, 0.9mA in fast power-down (FASTPD) mode, and 2µA in full power-down (FULLPD) mode. All modes retain register contents and wake instantly upon serial interface access-enabling aggressive power cycling between conversions without reconfiguration overhead.
Can the MAX1081BCUP+T interface directly with a TMS320-series DSP?
Yes-the MAX1081BCUP+T features an SSTRB (serial strobe) output that pulses high for exactly one SCLK period before the MSB of the conversion result appears on DOUT. This strobe aligns with TMS320-family DSP serial port timing requirements, enabling direct hardware synchronization without external logic or firmware delay loops.
MAX1081BCUP+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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1081BCUP+T FAQ
1.How can I place an order for MAX1081BCUP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1081BCUP+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 MAX1081BCUP+T reliable?
The price and inventory of MAX1081BCUP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1081BCUP+T is usually 5 days.
3.What payment methods are accepted for MAX1081BCUP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1081BCUP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1081BCUP+T?
MAX1081BCUP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1081BCUP+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 MAX1081BCUP+T?
For technical support, including MAX1081BCUP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1081BCUP+T requirements.
6.How does Aetrix verify that MAX1081BCUP+T is sourced from the original manufacturer or authorized distributors?
All MAX1081BCUP+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 MAX1081BCUP+T meets industry standards.
7.What is the process for return or replacement of MAX1081BCUP+T?
All MAX1081BCUP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1081BCUP+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 MAX1081BCUP+T part is unused and in its original packaging.
Return procedure for MAX1081BCUP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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