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Analog Devices Inc./Maxim Integrated MAX1108EUB+
- Part No.:
- MAX1108EUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1108EUB+.pdf
- Description:
- IC ADC 8BIT SAR 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,647
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Product details
Overview
The MAX1108EUB+ from Maxim Integrated is a low-power, 8-bit, dual-channel successive-approximation ADC with integrated track/hold, internal +2.048V reference, SPI/QSPI/MICROWIRE-compatible 4-wire serial interface, and software-configurable unipolar/bipolar input modes. It operates from +2.7V to +3.6V, draws only 105µA at 50ksps, and supports battery monitoring in portable data loggers and hand-held measurement devices.
For engineers reviewing the MAX1108EUB+ datasheet, MAX1108EUB+ pinout, MAX1108EUB+ application, or MAX1108EUB+ equivalent, this device offers verified 8-bit resolution, ±0.5 LSB DNL, 49dB SINAD at 10kHz, 1µs acquisition time, and µMAX-10 package compatibility - critical for space-constrained, low-quiescent-power analog front-end designs.
Technical Context
The MAX1108EUB+ employs a charge-redistribution SAR architecture with an on-chip track/hold and auto-zero rail referenced to VDD/2. Its conversion process is fully controlled via an 8-bit software-configurable control byte that selects input channel (CH0/CH1), reference source (internal/external), clock mode (internal/external), and input polarity (unipolar/bipolar).
It supports two clocking schemes: external SCLK drives both data transfer and conversion (50–500kHz), or internal oscillator enables autonomous conversion (400kHz typical). The analog input multiplexer routes sampled input (SI) and reference input (RI) to a 18pF holding capacitor, requiring RI stability within ±0.5LSB during conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR - delivers discrete digital output codes with monotonicity and no missing codes over temperature. |
| Sampling Rate | Up to 50ksps - enables real-time capture of signals up to 0.8MHz full-power bandwidth in undersampling applications. |
| INL / DNL | ±1 LSB / ±0.5 LSB - ensures accurate code transition boundaries and linearity for precision sensor interfacing. |
| Supply Current | 105µA at 50ksps, 0.5µA in power-down - extends battery life in solar-powered remote systems and portable instruments. |
| Reference Voltage | +2.048V internal - provides stable, temperature-compensated full-scale range without external components. |
| SINAD | 49dB at 10kHz - supports reliable signal fidelity for medical instrument front-ends and receive-signal strength indicators. |
| Package | 10-pin µMAX (3mm × 3mm) - occupies 20% footprint of 8-pin DIP, enabling high-density PCB layouts. |
Pinout & Package
The MAX1108EUB+ is housed in a 10-pin µMAX package with exposed pad (thermal performance optimized for surface-mount assembly). Pin 1 is VDD; pin 4 is GND; pin 5 is REF; pins 2 and 3 are CH0 and CH1 analog inputs; pin 6 is COM; pins 7–10 are CS, DIN, DOUT, and SCLK digital interface signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply rail | Accepts +2.7V to +3.6V; powers internal reference, T/H, and logic; requires local 0.1µF bypass to GND. |
| CH0 (Pin 2) | Analog input channel 0 | Sampled input (SI) in unipolar/bipolar modes; common-mode range 0V to VDD; max overvoltage ±0.3V. |
| CH1 (Pin 3) | Analog input channel 1 | Second independent sampled input; shares same electrical specs and configuration flexibility as CH0. |
| GND (Pin 4) | Analog/digital ground | Single ground reference for all analog and digital circuitry; must be low-impedance return path. |
| REF (Pin 5) | Reference voltage terminal | Outputs +2.048V internal reference or accepts external 1V–VDD reference; bypass with 1µF to GND. |
| COM (Pin 6) | Common-mode reference | Sets zero-code point in single-ended mode; must remain stable within ±0.5LSB during conversion. |
| CS (Pin 7) | Active-low chip select | Enables serial interface when low; places DOUT in high-impedance state when high. |
| DIN (Pin 8) | Serial data input | Accepts 8-bit control byte on rising SCLK edges; configures channel, reference, clock, and polarity modes. |
| DOUT (Pin 9) | Serial data output | Three-state output; delivers 8-bit conversion result MSB-first on falling SCLK edges; high-Z when CS = high. |
| SCLK (Pin 10) | Serial clock input | Clocks data in/out; in external clock mode, also controls conversion timing (50–500kHz required). |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Selects unipolar/bipolar and single-ended/pseudo-differential operation per conversion via 8-bit control byte - eliminates hardware rework for multi-sensor platforms. |
| VDD monitoring mode | Dedicated configuration bit enables direct measurement of supply voltage - simplifies battery health diagnostics without external resistive dividers. |
| Internal track/hold with no external hold capacitor | Integrated 18pF hold capacitor and auto-zero rail eliminate external components and layout sensitivity - reduces BOM count and board area. |
| SPI/QSPI/MICROWIRE-compatible interface | 4-wire serial protocol with standard CPOL=CPHA=0 timing - enables plug-and-play integration with ARM Cortex-M, PIC, and MSP430 microcontrollers. |
| Low-power shutdown mode | 0.5µA quiescent current achieved by writing SHDN bit in configuration register - preserves battery charge between measurements in intermittent-sampling systems. |
Applications
| Portable Data Logging | Hand-Held Measurement Devices |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and light intensity over weeks on coin-cell power. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes two analog sensors simultaneously; internal reference and low 105µA supply current minimize system power budget. Use Value: Enables >6-month battery life at 1Hz sampling; eliminates need for external voltage reference IC and reduces PCB area by 30% vs. discrete solutions. | Use Scenario: Pocket-sized multimeter measuring DC voltage, current, and resistance with auto-ranging and backlit LCD. IC Role / Device Role / Timing Role: Configurable unipolar/bipolar input supports both positive and negative voltage ranges; VDD monitoring verifies battery level before measurement. Use Value: Single IC replaces three discrete functions (ADC, reference, supply monitor); software-selectable modes reduce firmware complexity and calibration effort. |
| Medical Instruments | Solar-Powered Remote Systems |
Use Scenario: Portable pulse oximeter acquiring photodiode signals from red and infrared LEDs with precise timing synchronization. IC Role / Device Role / Timing Role: Dual-channel pseudo-differential sampling captures LED current and ambient light rejection; 1µs acquisition time supports fast LED pulsing. Use Value: Achieves 49dB SINAD at 10kHz for clean SpO₂ calculation; internal track/hold removes need for external op-amp buffer stages. | Use Scenario: Wireless soil moisture sensor deployed in agricultural fields, powered solely by small solar panel and supercapacitor. IC Role / Device Role / Timing Role: Low 0.5µA shutdown current preserves stored energy; software-triggered conversions minimize active time per reading. Use Value: Extends operational uptime to >90 days under partial sun; µMAX package withstands thermal cycling in outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit dual-channel serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7–5.25V supply; 1.25mW @ 50ksps; no internal reference; requires external 2.5V ref; SPI-only interface | Lacks internal reference and VDD monitoring; higher power draw limits battery life in ultra-low-power nodes | Choose when external precision reference already exists and higher throughput (>100ksps) is needed |
| MAX1112CPE+ | 8-pin PDIP; +4.5V to +5.5V only; 130µA @ 50ksps; +4.096V internal ref; no VDD monitoring mode | Higher supply voltage requirement excludes 3V-only systems; larger package increases board area | Choose for legacy through-hole designs or where +5V rail is standard and µMAX thermal performance is not critical |
Compared with ADS7822U and MAX1112CPE+, the MAX1108EUB+ uniquely integrates +2.048V reference, VDD monitoring, and 0.5µA shutdown in a 3mm × 3mm µMAX package - making it optimal for compact, battery-sensitive, single-supply embedded systems requiring dual-channel flexibility without external support components.
Availability
MAX1108EUB+ is available at Aetrix Electronics and suitable for portable data logging, hand-held measurement devices, and medical instruments requiring stable component supply across industrial temperature ranges (-40°C to +85°C).
Supply support for MAX1108EUB+ 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 MAX1108EUB+ belongs to Maxim's low-power serial ADC product line, engineered specifically for battery-operated instrumentation where size, power, and configurability outweigh raw speed requirements.
FAQ
What is the operating temperature range for the MAX1108EUB+?
The MAX1108EUB+ is rated for operation from -40°C to +85°C, as confirmed by its E-grade ordering suffix and the "MAX110_EUB" designation in Maxim's official ordering information table. This extended industrial temperature range ensures reliable performance in outdoor remote sensors and automotive cabin instrumentation where ambient conditions vary widely. The MAX1108EUB+ maintains specified INL, DNL, and reference accuracy across this full range.
Does the MAX1108EUB+ require external components for basic operation?
No, the MAX1108EUB+ requires only two external components for nominal operation: a 0.1µF ceramic capacitor from VDD to GND and a 1µF capacitor from REF to GND. These provide supply decoupling and internal reference stabilization, respectively. No external reference, op-amp buffers, hold capacitors, or clock sources are needed - the device integrates track/hold, +2.048V reference, and internal oscillator.
How does the VDD monitoring mode work in the MAX1108EUB+?
The MAX1108EUB+ implements VDD monitoring by internally routing the supply rail to the analog input multiplexer. When configured via the control byte (SEL2–SEL0 = 111), the device performs a conversion using VDD as the sampled input and the internal +2.048V reference - yielding a digital code proportional to VDD. This eliminates external resistor dividers and enables real-time battery health checks in portable systems.
Can the MAX1108EUB+ interface directly with a 3.3V microcontroller SPI port?
Yes, the MAX1108EUB+ digital interface is fully compatible with 3.3V SPI controllers. Its DIN, SCLK, and CS inputs accept logic-high thresholds as low as 2.0V (VIH min = 2.0V at VDD ≤ 3.6V), and DOUT outputs VOH ≥ VDD − 0.5V - ensuring robust 3.3V-level signaling. No level-shifting circuitry is required when interfacing with STM32, ESP32, or nRF52-series MCUs.
What is the maximum achievable sampling rate using the internal clock of the MAX1108EUB+?
The MAX1108EUB+ internal oscillator operates at 400kHz typical, enabling a maximum sampling rate of 50ksps (400kHz ÷ 8 clocks/conversion). This is confirmed in the Electrical Characteristics table under "Internal Clock Frequency" and "Conversion Time" sections. At this rate, the device achieves 49dB SINAD and ±0.5 LSB DNL - meeting requirements for audio pre-amplifier monitoring and sensor fusion in edge devices.
MAX1108EUB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 50k
- Number of Inputs:
- 2
- 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:
- 10-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1108EUB+ FAQ
1.How can I place an order for MAX1108EUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1108EUB+ 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 MAX1108EUB+ reliable?
The price and inventory of MAX1108EUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1108EUB+ is usually 5 days.
3.What payment methods are accepted for MAX1108EUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1108EUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1108EUB+?
MAX1108EUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1108EUB+ 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 MAX1108EUB+?
For technical support, including MAX1108EUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1108EUB+ requirements.
6.How does Aetrix verify that MAX1108EUB+ is sourced from the original manufacturer or authorized distributors?
All MAX1108EUB+ 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 MAX1108EUB+ meets industry standards.
7.What is the process for return or replacement of MAX1108EUB+?
All MAX1108EUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1108EUB+, 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 MAX1108EUB+ part is unused and in its original packaging.
Return procedure for MAX1108EUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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