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Analog Devices Inc./Maxim Integrated MAX1081BCUP
- Part No.:
- MAX1081BCUP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1081BCUP.pdf
- Description:
- IC ADC 10BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,348
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Product details
Overview
The MAX1081BCUP 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, supports software-configurable unipolar/bipolar and single-ended/pseudo-differential inputs, and achieves up to 300ksps sampling rate - ideal for battery-powered data acquisition in portable medical instruments and industrial sensor interfaces.
For engineers reviewing the MAX1081BCUP datasheet, MAX1081BCUP pinout, MAX1081BCUP application, or MAX1081BCUP equivalent, key selection criteria include its 300ksps throughput at 2.5mA supply current, ±0.5 LSB INL over temperature, 20-pin TSSOP package with SPI/QSPI/MICROWIRE compatibility, and four programmable power modes enabling µA-level shutdown current.
Technical Context
The MAX1081BCUP uses successive-approximation architecture with an on-chip track/hold and 8:1 analog multiplexer. Its input stage supports pseudo-differential operation across four channel pairs (CH0/CH1 through CH6/CH7), where only the positive input is sampled while the negative side must remain stable within ±0.5 LSB during conversion.
It features a 4-wire serial interface synchronized to an external SCLK (up to 4.8MHz), with CS-controlled three-state outputs (DOUT, SSTRB) and direct TMS320-family DSP compatibility via the strobe output. Internal reference buffering allows ±1.5% adjustment via REFADJ, or full external reference support from 1V to VDD1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes for precision measurement of analog signals. |
| Sampling Rate | 300ksps - enables real-time capture of signals up to 150kHz (Nyquist-limited) in high-fidelity data logging. |
| INL (Integral Nonlinearity) | ±0.5 LSB - ensures monotonicity and <0.05% full-scale error after calibration, critical for accurate system-level linearity. |
| Supply Voltage Range | +2.7V to +3.6V - matches Li-ion and regulated 3.3V rail systems without level-shifting or LDO overhead. |
| Power Modes | Normal (2.5mA), REDP (1.3mA), FASTPD (0.9mA), FULLPD (2µA) - allows dynamic power scaling between conversions to extend battery life. |
| Reference | Internal +2.500V ±1.5% (adjustable) or external 1V–VDD1 - eliminates need for external reference IC in space-constrained designs. |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - integrates directly with common microcontrollers and DSPs without glue logic. |
Pinout & Package
MAX1081BCUP is housed in a 20-pin thin shrink small-outline package (TSSOP) with exposed pad (not thermally enhanced), compatible with standard surface-mount reflow processes and PCB assembly automation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Eight single-ended or four pseudo-differential analog inputs; software-selectable via control byte. |
| COM (Pin 9) | Common Reference Node | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB for accuracy. |
| SHDN (Pin 10) | Hardware Shutdown Control | Active-low input that reduces supply current to 2µA (typ); independent of serial interface state. |
| REF (Pin 11) | Reference Output/Input | Provides buffered +2.5V internal reference or accepts external 1V–VDD1 reference when REFADJ = VDD1. |
| REFADJ (Pin 12) | Reference Adjustment Terminal | Allows ±1.5% fine-tuning of internal reference; disable buffer by tying to VDD1. |
| GND (Pin 13) | Analog/Digital Ground | Single ground plane required; separation not needed due to internal partitioning and low noise design. |
| DOUT (Pin 14) | Serial Data Output | Three-state MSB-first output; high-impedance when CS is high, synchronized to SCLK rising edge. |
| SSTRB (Pin 15) | Serial Strobe Output | Pulses high one clock period before MSB appears on DOUT - enables precise timing capture in DSP/FPGA interfaces. |
| 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 for serial interface; disables DOUT/SSTRB and prevents spurious conversions when high. |
| SCLK (Pin 18) | Serial Clock Input | External clock (≤4.8MHz) controlling conversion speed, data transfer timing, and internal state machine. |
| VDD2 (Pin 19) | Digital Supply | +2.7V to +3.6V supply for digital core and interface; decoupling required per layout guidelines. |
| VDD1 (Pin 20) | Analog Supply | +2.7V to +3.6V supply for analog front-end; may be tied to VDD2 but benefits from separate filtering. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel analog multiplexer + track/hold | Reduces external signal conditioning components and PCB area; eliminates need for external sample-hold IC in multi-sensor systems. |
| Software-configurable input modes | Enables runtime switching between unipolar/bipolar and single-ended/pseudo-differential configurations without hardware change. |
| Four selectable power modes | Supports adaptive power management - e.g., FULLPD between samples cuts average current below 100µA at 1ksps. |
| Internal +2.5V reference with ±1.5% adjustability | Removes external reference IC and associated passive components, reducing BOM count and layout complexity. |
| SPI/QSPI/MICROWIRE/TMS320-compatible interface | Direct connection to industry-standard controllers without level shifters or protocol translation logic. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG, pulse oximetry, or temperature signals in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary ADC digitizing analog sensor outputs with 10-bit resolution and 300ksps throughput. Use Value: Low 2.5mA active current and 2µA FULLPD mode extend single-cell Li-ion battery life beyond 100 hours in intermittent-read applications. |
Use Scenario: Field-deployed environmental monitoring nodes capturing temperature, humidity, and pressure at 1–10Hz intervals. IC Role / Device Role / Timing Role: Multi-channel analog front-end ADC interfacing with microcontroller via SPI for scheduled sampling bursts. Use Value: Integrated multiplexer and track/hold eliminate external MUX and TH circuits, reducing component count and board footprint by >30%. |
| Industrial Process Controllers | Pen Digitizer Signal Conditioning |
Use Scenario: Analog I/O module in PLC or RTU acquiring 4–20mA loop signals and thermocouple outputs. IC Role / Device Role / Timing Role: Precision ADC with bipolar input support and ±0.5 LSB INL for calibrated sensor signal digitization. Use Value: Internal reference stability (±15ppm/°C) and PSR >60dB minimize calibration drift across 0°C to +70°C operating range. |
Use Scenario: Active stylus pen digitizers requiring fast, low-noise sampling of capacitive position sensing electrodes. IC Role / Device Role / Timing Role: High-speed 8-channel ADC synchronizing with touch controller timing to resolve X/Y coordinate pairs. Use Value: 300ksps rate and pseudo-differential mode reject common-mode noise from display interference, improving positional accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, multi-channel, low-power serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply; 200ksps; no internal reference; requires external REF; 8-pin SOIC | Lacks integrated reference and track/hold; needs external op-amp buffering for high-Z sources | Select when board space is constrained and external reference already exists in system. |
| MAX11126ETE+ | 12-bit resolution; 500ksps; +2.7V–3.6V; internal 2.048V ref; 16-pin TQFN | Higher resolution and speed but larger package and higher 3.5mA active current | Select when system requires >10-bit precision and can accommodate higher power and different footprint. |
Compared with ADS7822U and MAX11126ETE+, the MAX1081BCUP offers optimal balance of integrated functionality (MUX+T/H+ref), ultra-low shutdown current (2µA), and compact 20-pin TSSOP - making it preferred for cost-sensitive, battery-operated, space-constrained designs needing verified 10-bit performance.
Availability
MAX1081BCUP is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered data loggers, industrial process controllers, and pen digitizer signal conditioning requiring stable component supply and long-term production continuity.
Supply support for MAX1081BCUP 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX1080/MAX1081 family was designed for low-power, multi-channel data acquisition in space- and energy-constrained systems - emphasizing integration (MUX, T/H, ref), flexible interface, and guaranteed performance across commercial temperature ranges.
FAQ
What is the maximum sampling rate supported by the MAX1081BCUP?
The MAX1081BCUP 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 achieved using 16 clock cycles per conversion and is validated across the full 0°C to +70°C operating temperature range for the BCUP grade.
Does the MAX1081BCUP require an external reference voltage?
No, the MAX1081BCUP does not require an external reference voltage. It includes an internal +2.500V ±1.5% reference with adjustable output via REFADJ. An external reference (1V to VDD1) may be used instead by disabling the internal buffer - but this is optional, not mandatory - and the MAX1081BCUP functions fully with its internal reference enabled.
How does the power-down functionality work on the MAX1081BCUP?
The MAX1081BCUP provides four software-selectable power modes: Normal (2.5mA), Reduced Power (REDP, 1.3mA), Fast Power-Down (FASTPD, 0.9mA), and Full Power-Down (FULLPD, 2µA). Accessing the serial interface automatically powers up the device, and quick turn-on time allows FULLPD between conversions - enabling sub-100µA average current at low sampling rates.
What input configurations does the MAX1081BCUP support?
The MAX1081BCUP supports both unipolar and bipolar input ranges, and either single-ended (CH0–CH7 vs. COM) or pseudo-differential (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7) operation - all configured via an 8-bit software control byte written to DIN. The pseudo-differential mode samples only the positive input but requires the negative input to remain stable within ±0.5 LSB.
Is the MAX1081BCUP pin-compatible with other devices in the MAX1080/MAX1081 family?
Yes, the MAX1081BCUP is pin-compatible with all members of the MAX1080/MAX1081 family offered in the 20-pin TSSOP package, including MAX1080ACUP, MAX1080BCUP, and MAX1081AEUP. Pin assignments, electrical characteristics, and interface behavior are identical across these variants - only supply voltage range, sampling rate, and temperature grade differ.
MAX1081BCUP 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1081BCUP FAQ
1.How can I place an order for MAX1081BCUP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1081BCUP 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 reliable?
The price and inventory of MAX1081BCUP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1081BCUP is usually 5 days.
3.What payment methods are accepted for MAX1081BCUP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1081BCUP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1081BCUP?
MAX1081BCUP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1081BCUP 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?
For technical support, including MAX1081BCUP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1081BCUP requirements.
6.How does Aetrix verify that MAX1081BCUP is sourced from the original manufacturer or authorized distributors?
All MAX1081BCUP 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 meets industry standards.
7.What is the process for return or replacement of MAX1081BCUP?
All MAX1081BCUP units undergo pre-shipment inspection (PSI). If there is an issue with MAX1081BCUP, 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 part is unused and in its original packaging.
Return procedure for MAX1081BCUP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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