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Analog Devices Inc./Maxim Integrated MAX1109CUB+T
- Part No.:
- MAX1109CUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1109CUB+T.pdf
- Description:
- IC ADC 8BIT SAR 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,495
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Product details
Overview
The MAX1109CUB+T from Maxim Integrated is a low-power, 8-bit, dual-channel successive-approximation analog-to-digital converter (ADC) with internal track/hold, +4.096V reference, SPI/QSPI/MICROWIRE-compatible 4-wire serial interface, and software-configurable unipolar/bipolar input modes. It operates from +4.5V to +5.5V, consumes 130µA at 50ksps, and supports VDD monitoring for battery-powered instrumentation.
For engineers reviewing the MAX1109CUB+T datasheet, MAX1109CUB+T pinout, MAX1109CUB+T application, or MAX1109CUB+T equivalent, this page delivers verified electrical specs, µMAX package layout, real-world use cases in portable diagnostics and solar-powered remote systems, and two confirmed alternative ADCs with documented functional and supply-voltage differences.
Technical Context
The MAX1109CUB+T uses 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 configures reference source (internal +4.096V or external 1V–VDD), clock mode (internal 400kHz oscillator or external 50–500kHz), and input topology (single-ended, pseudo-differential, unipolar, or bipolar).
Conversion timing is tightly coupled to the serial clock: in external-clock mode, each conversion requires exactly 10 SCLK cycles (e.g., 20µs at 500kHz); acquisition time is fixed at 1µs, and aperture jitter is under 50ps. The device enters 0.5µA power-down mode via software command and wakes in 12ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR - delivers 256 discrete output codes with no missing codes over temperature |
| Supply Voltage | +4.5V to +5.5V - compatible with standard 5V logic and industrial power rails |
| Sampling Rate | Up to 50ksps - supports real-time monitoring of sensor signals in handheld instruments |
| Internal Reference | +4.096V ±0.5LSB - enables full-scale 0–4.096V unipolar or ±2.048V bipolar measurement without external reference IC |
| Power Consumption | 130µA at 50ksps / 0.5µA in shutdown - extends battery life in solar- or 4–20mA-powered remote nodes |
| INL / DNL | ±0.5LSB / ±1LSB - ensures monotonicity and <0.2% end-point linearity error across full temperature range |
| Small-Signal BW | 1.5MHz - allows undersampling of transient events beyond Nyquist limit with anti-alias filtering |
Pinout & Package
The MAX1109CUB+T is housed in a 10-pin µMAX package (3mm × 3mm, 0.5mm pitch), offering 20% footprint vs. 8-pin DIP and optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +4.5V to +5.5V; powers internal reference, T/H, and digital core |
| CH0 (Pin 2) | Analog input channel 0 | Sampled input (SI) in single-ended or pseudo-differential mode; 0–VDD common-mode range |
| CH1 (Pin 3) | Analog input channel 1 | Second independent analog input; shares same configuration and timing as CH0 |
| GND (Pin 4) | Analog/digital ground | Single ground reference for all analog and digital functions; must be low-impedance |
| COM (Pin 6) | Common reference input | Sets zero-code voltage in single-ended mode; stable to ±0.5LSB during conversion |
| REF (Pin 5) | Reference voltage terminal | Outputs +4.096V internal reference or accepts external 1V–VDD reference; bypass with 1µF capacitor |
| CS (Pin 7) | Active-low chip select | Enables serial communication; DOUT goes high-Z when CS = high |
| DIN (Pin 8) | Serial data input | Receives 8-bit control byte on rising SCLK edges; configures mode, channel, polarity, clock source |
| DOUT (Pin 9) | Serial data output | Three-state output; delivers 8-bit result MSB-first on falling SCLK edges; high-Z when CS = high |
| SCLK (Pin 10) | Serial clock input | Clocks data in/out; sets conversion speed in external-clock mode (50–500kHz) |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended, pseudo-differential, unipolar, or bipolar operation selected via 8-bit control byte - eliminates hardware rework for multi-sensor platforms |
| VDD monitoring mode | Dedicated configuration bit enables direct measurement of supply voltage - replaces external resistor divider in battery-health circuits |
| SPI/QSPI/MICROWIRE compatibility | No level-shifting or glue logic required - interfaces directly with STM32, MSP430, and PIC microcontrollers using standard firmware drivers |
| Internal track/hold with 1µs acquisition | Eliminates need for external sample-hold IC and associated passive components - reduces BOM count and PCB area |
| 0.5µA shutdown current | Reduces quiescent draw by >260× vs. active mode - critical for intermittent-sampling applications like environmental loggers |
Applications
| Portable Data Logging | Hand-Held Measurement Devices |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and light intensity every 10 seconds. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing analog outputs from three sensors (two channels used, third multiplexed via COM switching), with VDD monitoring ensuring accurate low-battery detection. Use Value: 130µA active current and 0.5µA shutdown extend 2xAA alkaline battery life to >2 years; µMAX package enables compact enclosure design. | Use Scenario: Pocket-sized multimeter measuring DC voltage, resistance, and continuity with autoranging and backlit LCD. IC Role / Device Role / Timing Role: Primary ADC acquiring high-accuracy readings in unipolar mode (0–4.096V full scale) with internal reference, while supporting bipolar offset calibration via COM pin. Use Value: ±0.5LSB INL and ±1LSB DNL ensure 0.2% measurement accuracy; SPI interface simplifies firmware integration with low-cost MCU. |
| Medical Instruments | Solar-Powered Remote Systems |
Use Scenario: Portable pulse oximeter measuring photodiode currents from red and IR LEDs through transimpedance amplifiers. IC Role / Device Role / Timing Role: Dual-channel ADC sampling synchronized LED drive signals and photodiode outputs in pseudo-differential mode to reject common-mode noise. Use Value: 1.5MHz small-signal bandwidth captures fast LED pulses; 50ksps rate supports >100Hz sampling for SpO₂ calculation. | Use Scenario: Off-grid weather station powered by 6V solar panel and supercapacitor, transmitting sensor data hourly via LoRaWAN. IC Role / Device Role / Timing Role: ADC performing burst measurements of solar voltage, battery voltage, and ambient temperature before entering 0.5µA shutdown until next wake-up. Use Value: VDD monitoring eliminates separate fuel-gauge IC; 4.5–5.5V supply range matches regulated solar output; µMAX thermal performance sustains reliability in outdoor enclosures. |
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 | 2.7–5.25V supply; 125µA @ 50ksps; internal 2.5V ref; SPI-only interface | Lacks VDD monitoring mode and bipolar input support; lower supply voltage ceiling | Select when operating below 4.5V or requiring higher resolution (12-bit) - not drop-in compatible due to different control protocol and pinout |
| TLV2548IPW | 2.7–5.5V supply; 1.5mW @ 200ksps; internal 2.5V ref; 8-channel mux; no VDD monitor | Higher power (≈300µA), larger TSSOP-20 package, no software-selectable bipolar mode | Choose for multi-sensor systems needing >2 channels; requires PCB redesign and firmware adaptation - not pin-compatible |
Compared with ADS7822U and TLV2548IPW, the MAX1109CUB+T uniquely combines 4.5–5.5V operation, VDD monitoring, bipolar capability, and µMAX packaging - making it optimal for 5V-powered portable diagnostics where supply headroom and feature integration are critical.
Availability
MAX1109CUB+T is available at Aetrix Electronics and suitable for portable data logging, hand-held measurement devices, and solar-powered remote systems requiring stable component supply and long-term manufacturability.
Supply support for MAX1109CUB+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 MAX1108/MAX1109 product line targets ultra-low-power, space-constrained data acquisition systems - delivering integrated reference, track/hold, and serial interface in minimal footprint for battery-operated instrumentation.
FAQ
What is the maximum sampling rate supported by the MAX1109CUB+T?
The MAX1109CUB+T supports up to 50ksps in external clock mode with a 500kHz SCLK. Conversion time is fixed at 20µs (10 clock cycles), and the internal oscillator runs at 400kHz - limiting internal-clock mode to ~40ksps. This rate is sufficient for monitoring slow-varying sensor signals in handheld instruments and remote telemetry systems.
Does the MAX1109CUB+T require external components for basic operation?
Yes - a 1µF capacitor is required between REF and GND when using the internal +4.096V reference, and a 0.1µF capacitor is recommended at COM for noise reduction in VDD monitoring mode. No external hold capacitor or reference IC is needed, but anti-alias filtering is advised for input signals above 1.5MHz to prevent aliasing.
Can the MAX1109CUB+T measure negative voltages?
Yes, in bipolar input mode: the MAX1109CUB+T accepts differential inputs where |CH0 − COM| or |CH1 − COM| ranges from 0 to ±2.048V (half the internal reference), outputting twos-complement codes. However, absolute pin voltages must remain within GND − 0.3V to VDD + 0.3V - true negative supply rails are not supported.
How does the VDD monitoring mode function in the MAX1109CUB+T?
In VDD monitoring mode, the MAX1109CUB+T internally routes VDD to the CH0 input and uses COM as reference, producing an 8-bit code proportional to supply voltage. With +4.096V internal reference, each LSB equals 15.625mV - enabling precise battery-level estimation without external resistive dividers or dedicated fuel-gauge ICs.
Is the MAX1109CUB+T pin-compatible with the MAX1108CUB+T?
No - although both share the same 10-pin µMAX package and pinout, the MAX1109CUB+T is specified for +4.5V to +5.5V operation and features a +4.096V internal reference, whereas the MAX1108CUB+T operates from +2.7V to +3.6V with +2.048V reference. Swapping them requires verifying supply rail compatibility and recalibrating reference-dependent measurements.
MAX1109CUB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1109CUB+T FAQ
1.How can I place an order for MAX1109CUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1109CUB+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 MAX1109CUB+T reliable?
The price and inventory of MAX1109CUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1109CUB+T is usually 5 days.
3.What payment methods are accepted for MAX1109CUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1109CUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1109CUB+T?
MAX1109CUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1109CUB+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 MAX1109CUB+T?
For technical support, including MAX1109CUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1109CUB+T requirements.
6.How does Aetrix verify that MAX1109CUB+T is sourced from the original manufacturer or authorized distributors?
All MAX1109CUB+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 MAX1109CUB+T meets industry standards.
7.What is the process for return or replacement of MAX1109CUB+T?
All MAX1109CUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1109CUB+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 MAX1109CUB+T part is unused and in its original packaging.
Return procedure for MAX1109CUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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