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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:
- 2-CHANNEL, SERIAL 8-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:7,501
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Product details
Overview
The MAX1108EUB from Maxim Integrated is a low-power, 8-bit, dual-channel successive-approximation analog-to-digital converter (ADC) with internal track/hold, +2.048V reference, and SPI/QSPI/MICROWIRE-compatible 4-wire serial interface. It operates from +2.7V to +3.6V, draws only 105µA at 50ksps, supports software-configurable unipolar/bipolar and single-ended/differential inputs, and includes VDD monitoring-ideal for battery-powered portable data loggers and hand-held measurement devices.
For engineers reviewing the MAX1108EUB datasheet, MAX1108EUB pinout, MAX1108EUB application, or MAX1108EUB equivalent, this page delivers verified electrical specs (INL ±0.2 LSB, tCONV = 20 µs, VREF = +2.048V), package mapping (10-pin µMAX), functional pin roles, real-world use cases, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX1108EUB employs a charge-redistribution SAR architecture with integrated track/hold and auto-zero rail, enabling accurate 8-bit conversion without external hold capacitors. Its flexible control-byte programming allows runtime selection of input mode (unipolar/bipolar), reference source (internal +2.048V or external 1V–VDD), clock source (internal 400kHz oscillator or external 50–500kHz), and power-down state.
Conversion timing is tightly coupled to clock edges: acquisition begins on the falling edge after bit 4 (SEL0) of the control byte, and hold initiates on the falling edge after bit 2 (I/EREF). The device achieves 1.5MHz small-signal bandwidth and supports undersampling of transient signals, while requiring stable COM voltage (±0.5LSB) during conversion for pseudo-differential accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR - delivers discrete digital output with monotonic transfer function and no missing codes over temperature. |
| Sampling Rate | Up to 50ksps - enables real-time capture of signals up to 25kHz (Nyquist-limited) or higher via undersampling techniques. |
| Internal Reference | +2.048V - provides full-scale range of 0–2.048V in unipolar mode; eliminates need for external precision reference in many applications. |
| Supply Current | 105µA at 3V/50ksps - supports multi-year operation from coin-cell batteries in portable instrumentation. |
| Power-Down Current | 0.5µA - reduces system standby power by >200×, critical for solar-powered remote sensors and wake-on-event designs. |
| INL / DNL | ±0.2 LSB / ±0.1 LSB (typ) - ensures high code-to-code linearity for accurate amplitude measurement in medical and diagnostic tools. |
| Small-Signal BW | 1.5MHz - allows faithful digitization of fast transients and harmonics beyond Nyquist frequency when anti-aliased. |
Pinout & Package
The MAX1108EUB is housed in a compact 10-pin µMAX package (3mm × 3mm, 0.5mm pitch), occupying only 20% of an 8-pin plastic DIP footprint-optimized for space-constrained portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; powers analog and digital sections; PSR ±0.4mV/V ensures stable conversion under supply ripple. |
| CH0 (Pin 2) | Analog input channel 0 | Sampled input (SI) in single-ended or pseudo-differential mode; common-mode range 0 to VDD; max input ±50mV beyond rails. |
| CH1 (Pin 3) | Analog input channel 1 | Second independent analog input; shares same configuration and timing as CH0; supports channel-to-channel offset matching ±0.1 LSB. |
| GND (Pin 4) | Analog/digital ground | Single ground reference for all analog and digital circuitry; requires low-impedance connection to minimize noise coupling. |
| REF (Pin 5) | Reference voltage terminal | Outputs internal +2.048V or accepts external 1V–VDD reference; bypass with 1µF capacitor for <0.5LSB settling. |
| COM (Pin 6) | Common-mode reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5LSB during conversion to avoid error. |
| CS (Pin 7) | Active-low chip select | Enables serial communication; DOUT enters high-impedance state when CS is high-enables bus sharing with other SPI peripherals. |
| DIN (Pin 8) | Serial data input | Receives 8-bit control byte on rising SCLK edges; configures input mode, clock source, reference, and power state. |
| DOUT (Pin 9) | Serial data output | Three-state output; delivers 8-bit conversion result MSB-first on falling SCLK edges; compatible with 3V/5V logic systems. |
| SCLK (Pin 10) | Serial clock input | Clocks data in/out; in external mode sets conversion speed (50–500kHz); in internal mode shifts data only (up to 2MHz). |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Runtime selection of unipolar/bipolar and single-ended/pseudo-differential via 8-bit control byte-eliminates hardware redesign for signal range changes. |
| VDD monitoring capability | Dedicated mode measures supply voltage directly using internal reference-enables battery health tracking without external resistive divider. |
| Integrated track/hold with no external capacitor | On-chip 18pF hold capacitor and 6.5kΩ input resistance enable full 8-bit accuracy with source impedances ≤2.7kΩ at 2MHz clock. |
| SPI/QSPI/MICROWIRE compatibility | Standard 4-wire interface with CPOL=CPHA=0 timing-direct connection to microcontrollers (e.g., STM32, MSP430) without level shifters or glue logic. |
| Low-power shutdown with fast wake-up | 0.5µA shutdown current and 12ms wake-up time-supports duty-cycled sensing in energy-harvesting systems with minimal latency penalty. |
Applications
| Portable Data Logging | Hand-Held Measurement Devices |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and light levels every 10 seconds. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes analog sensor outputs; internal reference and low quiescent current extend battery life; SPI interface enables direct MCU readout. Use Value: Eliminates external reference and hold capacitor, reducing BOM count by 2 components and PCB area by >30% versus discrete solutions. | Use Scenario: Pocket-sized multimeter measuring DC voltage, current, and resistance with auto-ranging. IC Role / Device Role / Timing Role: Configurable unipolar/bipolar input handles both positive and negative test leads; VDD monitoring tracks battery charge state for low-battery alert. Use Value: Single 8-bit ADC replaces two separate 8-bit converters and a supervisor IC-reducing component count and calibration complexity. |
| Medical Instruments | System Diagnostics |
Use Scenario: Portable ECG front-end capturing lead-II differential signals at 1ksps with baseline wander correction. IC Role / Device Role / Timing Role: Pseudo-differential mode digitizes CH0–COM pair; COM referenced to mid-supply enables AC-coupled input; 1.5MHz BW supports high-frequency artifact rejection. Use Value: ±0.1 LSB DNL and 49dB SINAD ensure clinical-grade amplitude fidelity for waveform interpretation and arrhythmia detection. | Use Scenario: Industrial PLC module monitoring 4–20mA loop current and supply rail health in factory automation. IC Role / Device Role / Timing Role: CH0 reads loop current via shunt resistor; CH1 monitors VDD; software reconfiguration adapts to different sensor types without firmware update. Use Value: Dual-channel integration and VDD monitoring reduce external components by 4 (op-amps, references, supervisors), improving long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit dual-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit, 200ksps, +2.7V–+5.25V supply, internal 2.5V ref, SPI interface, 8-pin SOIC package | Higher speed but larger footprint; no bipolar mode or VDD monitoring; requires external decoupling at REF | Choose for higher throughput where board space permits and bipolar input is unnecessary. |
| MAX1110EUB | 8-bit, dual-channel, +2.7V–+3.6V, 150µA @ 50ksps, +2.048V ref, identical µMAX-10 package and pinout | Higher supply current; same feature set and software compatibility; lower production volume | Drop-in replacement if MAX1108EUB is unavailable; verify thermal performance under continuous conversion. |
Compared with ADS7822U, MAX1108EUB offers smaller size, bipolar input, and VDD monitoring at lower power-but trades off maximum sampling rate. Against MAX1110EUB, it delivers 30% lower active current and identical functionality, making it the preferred choice for ultra-low-power portable designs.
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 extended 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and portable applications.
The MAX1108EUB belongs to Maxim's precision low-power ADC product line, designed 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 ordering suffix "EUB" (per Maxim's ordering information table). This extended industrial temperature range ensures reliable performance in outdoor sensor nodes, automotive diagnostics tools, and factory-floor equipment where ambient conditions vary widely. All electrical specifications-including INL, gain error, and supply current-are guaranteed across this full range.
Does the MAX1108EUB support bipolar input configurations?
Yes, the MAX1108EUB supports bipolar input operation via software configuration of its control byte. In bipolar mode, the full-scale range becomes ±VREF/2 (±1.024V with internal reference), and output data is delivered in two's-complement format. This allows direct digitization of AC-coupled signals such as audio waveforms or differential sensor outputs without external level-shifting circuitry-confirmed in the Modes of Operation section and Table 2 of the datasheet.
Can the MAX1108EUB use an external reference voltage?
Yes, the MAX1108EUB accepts an external reference voltage applied to the REF pin, ranging from 1V to VDD. When using an external reference, the internal +2.048V reference is disabled, and full-scale conversion corresponds to the applied reference value. The device specifies ±0.4mV load regulation and requires a 1µF bypass capacitor at REF for stability-details confirmed in the Electrical Characteristics and Pin Description sections.
What is the minimum acquisition time required for accurate conversion on the MAX1108EUB?
The MAX1108EUB specifies a minimum track/hold acquisition time (tACQ) of 1µs at the maximum 2MHz SCLK frequency. This value is derived from the internal RC time constant (6 × (RS + 6.5kΩ) × 18pF) and is guaranteed across temperature and supply voltage. For source impedances ≤2.7kΩ, no additional acquisition delay is needed; higher impedances require reduced clock rates per the datasheet's design guidance.
Is the MAX1108EUB pin-compatible with other devices in the MAX1108/MAX1109 family?
Yes, the MAX1108EUB is pin-compatible with all variants in the MAX1108/MAX1109 family-including MAX1108CUB, MAX1109CUB, and MAX1109EUB-as they share the identical 10-pin µMAX package and pinout. This allows drop-in substitution between temperature grades (CUB vs. EUB) and voltage versions (MAX1108 vs. MAX1109), provided the system's supply voltage and reference requirements are met.
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:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 50k
- Number of Inputs:
- 1, 2
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- 4-Wire Serial, Microwire, QSPI, 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:
- Internal Oscillator
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-uMAX
- 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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