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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 300KSPS 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,069
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Product details
Overview
MAX1081BEUP+ 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 delivers ±0.5 LSB INL and 60dB SINAD for precision data acquisition in portable instrumentation.
For engineers reviewing the MAX1081BEUP+ datasheet, MAX1081BEUP+ pinout, MAX1081BEUP+ application, or MAX1081BEUP+ equivalent, this page provides verified electrical specs, TSSOP-20 pin mapping, real-world use cases in battery-powered medical and process control systems, and two validated alternative ADCs with documented functional and power-supply differences.
Technical Context
The MAX1081BEUP+ uses successive-approximation (SAR) architecture with an internal switched-capacitor DAC and dedicated track/hold circuitry. Its pseudo-differential input stage samples only the positive channel (IN+) while referencing the negative side (IN−) to a stable COM node or paired channel - requiring ±0.5 LSB stability at IN− during conversion.
It implements a 4-wire SPI/QSPI/MICROWIRE-compatible serial interface with SSTRB strobe output for TMS320 DSP synchronization, and supports 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-on-CS activation.
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 |
| INL | ±0.5 LSB - ensures monotonicity and ≤0.05% full-scale linearity error across temperature |
| Supply Voltage | +2.7V to +3.6V - enables direct integration into 3.3V embedded systems without level-shifting |
| Reference | Internal +2.500V ±1.5% - eliminates external reference component while supporting REFADJ trimming |
| Power Modes | Four selectable states - reduces average current to <2µA in FULLPD mode between conversions |
| Input Configuration | 8-channel single-ended or 4-channel pseudo-differential - configurable via 3-bit SEL register |
Pinout & Package
MAX1081BEUP+ is housed in a 20-pin TSSOP package (4.4mm × 6.5mm, 0.65mm pitch) with exposed pad for thermal performance. Pin functions are electrically validated per Maxim's official datasheet Rev 0 (19-1685).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Eight single-ended or four pseudo-differential input pairs; each requires stable COM reference |
| COM (Pin 9) | Common-Mode Reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5 LSB during conversion |
| SHDN (Pin 10) | Hardware Shutdown Control | Active-low signal reducing supply current to 2µA; overrides software power modes |
| REF (Pin 11) | Reference Buffer Output / External Ref Input | Delivers 2.500V nominal when internal buffer enabled; accepts 1V–VDD1 external reference when REFADJ = VDD1 |
| REFADJ (Pin 12) | Reference Adjustment Terminal | Trims internal reference ±1.5%; disable buffer by tying to VDD1 |
| GND (Pin 13) | Analog & Digital Ground | Single ground plane required; separation not supported per design |
| DOUT (Pin 14) | Serial Data Output | 3-state output clocked on SCLK rising edge; high-impedance when CS = high |
| SSTRB (Pin 15) | Serial Strobe Output | Pulses high one SCLK period before MSB shift-out; synchronizes TMS320-family DSP capture |
| 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; disables DOUT/SSTRB and powers down interface when high |
| SCLK (Pin 18) | Serial Clock Input | Drives conversion timing and data transfer; 4.8MHz max for MAX1081; 40–60% duty cycle required |
| VDD2 (Pin 19) | Digital Supply | +2.7V to +3.6V supply for digital core and interface; must match VDD1 within ±0.3V |
| VDD1 (Pin 20) | Analog Supply | +2.7V to +3.6V supply for analog front-end and reference; decoupling mandatory at pin |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Track/Hold | Eliminates need for external sample-hold IC; 625ns acquisition time supports 300ksps sampling |
| Software-Configurable Input Mode | Single control byte selects unipolar/bipolar and single-ended/pseudo-differential operation per conversion |
| Low-Power Power-Down Modes | Full power-down draws only 2µA; auto-wake on CS enables burst-mode acquisition without firmware overhead |
| SPI/QSPI/MICROWIRE Compatibility | No external logic needed; CPOL=0/CPHA=0 configuration works directly with standard microcontroller peripherals |
| Internal Reference with Trim | 2.500V ±1.5% output with REFADJ pin allows system-level calibration without external DAC or resistor network |
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 analog lead signals at 250–500Hz with programmable gain and bipolar input range. Use Value: 300ksps capability enables oversampling for noise reduction; 2.5V internal reference ensures consistent scale across units without calibration drift. |
Use Scenario: Multi-sensor environmental logging (temperature, humidity, pressure) in remote field nodes. IC Role / Device Role / Timing Role: Central analog acquisition hub switching between 8 sensor channels using pseudo-differential mode to reject common-mode noise. Use Value: Full power-down mode cuts quiescent current to 2µA between readings, extending 2xAA battery life to >2 years at 1-minute intervals. |
| Industrial Process Controllers | Pen Digitizer Signal Conditioning |
|
Use Scenario: Analog feedback loop monitoring of motor current, voltage, and temperature in PLC I/O modules. IC Role / Device Role / Timing Role: High-accuracy 10-bit digitization of isolated analog inputs with ±0.5 LSB INL for closed-loop stability. Use Value: Internal +2.5V reference and ±3.0 LSB gain error specification ensure repeatability across production batches without per-unit trimming. |
Use Scenario: Position sensing in active stylus digitizers where pen tip voltage varies with proximity and pressure. IC Role / Device Role / Timing Role: Fast 300ksps sampling captures rapid pen movement transients; pseudo-differential mode rejects EMI from display drivers. Use Value: 625ns track/hold acquisition time and 3MHz full-power bandwidth preserve signal fidelity during high-speed strokes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply; no internal reference; requires external 2.5V ref; 200ksps max | Lacks integrated reference and power-down modes; needs additional ref IC and layout space | Choose when higher supply flexibility is needed and board area permits external reference |
| AD7476ARTZ-REEL7 | Single 2.35V–5.25V supply; no mux; no internal ref; 1MSPS; 3.5mW @ 1MSPS | Higher speed but no channel multiplexer or track/hold; requires external signal conditioning | Prefer for single-channel high-speed applications where mux and T/H are implemented externally |
Compared with ADS7822U and AD7476ARTZ-REEL7, MAX1081BEUP+ uniquely integrates multiplexer, track/hold, and trimmable 2.5V reference in a single 20-pin TSSOP - reducing BOM count and PCB footprint while enabling true 8-channel battery-operated data acquisition without external support components.
Availability
MAX1081BEUP+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial process controllers requiring stable component supply and long-term lifecycle support.
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 communications applications.
The MAX1080/MAX1081 family was engineered for low-power, multi-channel data acquisition in space-constrained, battery-sensitive systems - emphasizing integrated functionality, supply flexibility, and guaranteed AC/DC performance across automotive-grade temperature ranges.
FAQ
What is the maximum sampling rate of the MAX1081BEUP+?
The MAX1081BEUP+ achieves a maximum sampling rate of 300ksps under specified conditions: VDD1/VDD2 = +2.7V to +3.6V, fSCLK = 4.8MHz, and 16 clock cycles per conversion. This rate is confirmed in the Electrical Characteristics table for MAX1081 devices and applies directly to the MAX1081BEUP+ variant with its –40°C to +85°C operating range.
Does the MAX1081BEUP+ require an external reference voltage?
No, the MAX1081BEUP+ includes an internal +2.500V reference with ±1.5% 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 - the internal reference is fully functional and calibrated for standalone operation.
What power modes does the MAX1081BEUP+ support and how are they controlled?
The MAX1081BEUP+ supports four power modes: normal (2.5mA), reduced-power (1.3mA), fast power-down (0.9mA), and full power-down (2µA). These are selected via two bits (PD1/PD0) in the 8-bit control byte written to DIN, and may also be overridden by asserting the SHDN pin low for hardware shutdown.
Can the MAX1081BEUP+ interface directly with a TMS320 DSP?
Yes, the MAX1081BEUP+ 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 timing aligns precisely with TMS320-family DSP serial port capture requirements, enabling direct connection without glue logic or FPGA intervention.
What is the input voltage range for pseudo-differential operation on the MAX1081BEUP+?
In pseudo-differential mode, the MAX1081BEUP+ accepts input pairs CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. The valid input voltage range for each channel is 0V to VDD1, with COM referenced to GND. The differential input span is limited by the stability requirement at the IN− node: it must remain within ±0.5 LSB of its setpoint during conversion to maintain accuracy.
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:
- 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:
- -
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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