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Analog Devices Inc./Maxim Integrated MAX11645EUA+T
- Part No.:
- MAX11645EUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX11645EUA+T.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:12,186
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Product details
Overview
MAX11645EUA+T from Maxim Integrated is a low-power, 12-bit, 2-channel I²C-compatible analog-to-digital converter with internal track/hold, 2.048V reference, and ultra-compact 8-pin μMAX® package. It operates from 2.7V–3.6V, draws only 6µA at 1ksps, supports software-configurable unipolar/bipolar and single-ended/differential inputs, and targets battery-powered sensor monitoring in portable medical instruments and solar-powered remote systems.
For engineers reviewing the MAX11645EUA+T datasheet, MAX11645EUA+T pinout, MAX11645EUA+T application, or MAX11645EUA+T equivalent, this page delivers verified electrical parameters, I²C timing modes (Fast Mode up to 400kHz and High-Speed Mode up to 1.7MHz), differential nonlinearity (±1 LSB), internal reference accuracy (±80mV over temperature), and validated pin mapping for μMAX® layout integration.
Technical Context
The MAX11645EUA+T uses successive-approximation architecture with fully differential track/hold circuitry, enabling accurate sampling of transient signals up to 5MHz small-signal bandwidth. Its internal 2.048V reference and programmable input configuration (SGL/DIF, BIP/UNI) allow flexible analog front-end design without external components.
It implements AutoShutdown™ to reduce supply current below 1µA between conversions and supports two I²C clocking modes: Fast Mode (400kHz, ≤22.2ksps) and High-Speed Mode (1.7MHz, up to 94.4ksps), with slave address 0110110 (R/W bit determines direction).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.5mV full-scale step size with 2.048V reference |
| INL / DNL | ±1 LSB - ensures monotonicity and <0.025% end-point linearity error across temperature |
| Supply Range | 2.7V to 3.6V - compatible with single-cell Li-ion and 3.3V system rails |
| Sampling Rate | Up to 94.4ksps (HS mode) - supports real-time monitoring of fast transients in power-supply supervision |
| I²C Interface | 400kHz Fast Mode & 1.7MHz High-Speed Mode - enables high-throughput sensor data streaming without CPU polling overhead |
| Reference Voltage | Internal 2.048V ±40mV (−40°C to +85°C) - eliminates need for external precision reference in space-constrained designs |
| Power Consumption | 6µA at 1ksps, 0.5µA in Power-Down - extends battery life in handheld portable applications beyond 10 years |
Pinout & Package
MAX11645EUA+T is housed in an 8-pin μMAX® package (3.0mm × 3.0mm, 0.5mm pitch), optimized for high-density PCB layouts. Pin functions are electrically validated per Maxim's official pin description and confirmed on production-grade WLP and μMAX variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | AIN0, AIN1 | Analog input channels - support software-selectable single-ended (vs. GND) or differential (AIN0–AIN1) acquisition |
| 3 | N.C. | No internal connection - must be left floating or tied to GND; no routing or decoupling required |
| 4 | REF | Reference I/O - outputs internal 2.048V reference when enabled; accepts external 1V–VDD reference when configured |
| 5 | SCL | I²C clock input - controls data transfer timing; supports 400kHz/1.7MHz modes with defined rise/fall times (≤300ns) |
| 6 | SDA | I²C bidirectional data line - requires external pull-up (≥750Ω); handles acknowledge/nack signaling per I²C protocol |
| 7 | GND | Analog/digital ground - shared return path; must be connected to low-impedance system ground plane |
| 8 | VDD | Positive supply - bypassed to GND with 0.1µF ceramic capacitor placed within 2mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces IDD to <1µA between conversions - eliminates need for external enable control in intermittent-sampling systems |
| Internal FIFO with Channel-Scan Mode | Enables automatic round-robin sampling of both AIN0 and AIN1 - simplifies firmware for dual-sensor monitoring |
| Software-Configurable Input Modes | Single-ended/differential and unipolar/bipolar selection via setup/configuration bytes - replaces discrete mux and level-shifting circuitry |
| Ultra-Tiny μMAX® Package | 3.0mm × 3.0mm footprint - fits in <9mm² board area, ideal for wearable and implantable medical devices |
| Extended Temperature Range | Guaranteed operation from −40°C to +85°C - suitable for industrial edge nodes and outdoor solar telemetry |
Applications
| Handheld Portable Medical Devices | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) with dual electrode sensing and low-power MCU host. IC Role / Device Role / Timing Role: ADC digitizes analog electrochemical signals from two electrodes at 1ksps with auto-scan mode. Use Value: 6µA quiescent current extends coin-cell battery life to >2 years; internal 2.048V reference ensures consistent calibration across temperature. |
Use Scenario: Portable multimeter measuring voltage, current, and resistance with auto-ranging. IC Role / Device Role / Timing Role: Configurable 2-channel ADC acquires reference and sense signals simultaneously in differential mode. Use Value: ±1 LSB INL guarantees measurement repeatability to 0.025% accuracy; I²C HS mode enables rapid range switching without bus contention. |
| Solar-Powered Remote Monitoring | Power-Supply Supervision |
Use Scenario: Off-grid environmental sensor node powered by 3.7V LiPo + solar charger. IC Role / Device Role / Timing Role: Measures panel voltage, battery voltage, and temperature using single-ended inputs with internal reference. Use Value: 2.7V–3.6V supply range matches LiPo discharge curve; 0.5µA shutdown current prevents parasitic drain during nighttime sleep. |
Use Scenario: FPGA or ASIC power-rail monitoring in telecom baseband cards. IC Role / Device Role / Timing Role: Digitizes 12V, 3.3V, and 1.2V rails via resistive dividers; triggers alert on out-of-tolerance condition. Use Value: 5MHz analog bandwidth captures rail collapse events; PSRR of ±2.0 LSB/V rejects switching noise from adjacent DC/DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit I²C ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, SPI interface only; no internal reference; 2.7V–5.25V supply; 1.25µs conversion time | Requires external reference and SPI host - unsuitable for I²C-only systems or space-constrained layouts | Select only if SPI infrastructure exists and μMAX® footprint is not required |
| MAX11603EUA+ | 10-bit resolution; same μMAX® package and I²C interface; 2.048V reference; lower power (3µA @ 1ksps) | Limited to 10-bit precision - insufficient for high-accuracy medical or metrology use cases | Choose for cost-sensitive, lower-precision battery monitoring where 0.1% accuracy is acceptable |
Compared with ADS7822U and MAX11603EUA+, the MAX11645EUA+T uniquely combines I²C compatibility, 12-bit precision, integrated 2.048V reference, and μMAX® packaging - making it optimal for compact, low-power, high-accuracy sensor interfaces where bus simplicity and layout density are critical.
Availability
MAX11645EUA+T is available at Aetrix Electronics and suitable for handheld portable medical devices, battery-powered test equipment, and solar-powered remote systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX11645EUA+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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX11644/MAX11645 product line was designed for ultra-low-power, space-constrained sensor signal conditioning - delivering high-resolution ADC performance in wafer-level and μMAX® packages for next-generation portable and energy-harvesting systems.
FAQ
What is the maximum sample rate achievable with MAX11645EUA+T?
The MAX11645EUA+T achieves up to 94.4ksps in I²C High-Speed Mode (1.7MHz SCL), limited by internal clock frequency and conversion time of 10.6µs with external clock. In Fast Mode (400kHz), throughput drops to 22.2ksps. The device automatically enters AutoShutdown™ between conversions unless continuous sampling is explicitly enabled via configuration register.
Does MAX11645EUA+T require an external reference voltage?
No - the MAX11645EUA+T includes a factory-trimmed 2.048V internal reference with ±40mV tolerance over −40°C to +85°C. External reference (1V to VDD) is optional and selected via setup byte; using the internal reference eliminates BOM cost and board space while maintaining 12-bit linearity (±1 LSB INL).
How is differential input configured on MAX11645EUA+T?
Differential input is enabled by setting the SGL/DIF bit to '0' in the configuration byte. When active, the MAX11645EUA+T measures AIN0 minus AIN1. Bipolar operation (±VREF/2 range, two's complement output) is then selected via the BIP/UNI bit in the setup byte; unipolar mode (0 to VREF) is default and used for single-ended inputs.
What are the I²C slave address options for MAX11645EUA+T?
The MAX11645EUA+T has a fixed 7-bit slave address of 0110110 (0x36 hex). The R/W bit (bit 0) determines direction: write = 0x6C, read = 0x6D. No address pins or hardware strapping options exist - all variants share this address, requiring bus arbitration in multi-device systems.
Can MAX11645EUA+T operate from a 3.3V supply while maintaining full 12-bit performance?
Yes - the MAX11645EUA+T is specified for 2.7V–3.6V operation and maintains full 12-bit performance (±1 LSB INL/DNL, 70dB SINAD) across this range. At VDD = 3.3V, typical supply current is 670µA at 94.4ksps and 6µA at 1ksps, with internal reference output stable at 2.048V ±0.5%.
MAX11645EUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 94.4k
- Number of Inputs:
- 1, 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- I2C
- 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:
- 8-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11645EUA+T FAQ
1.How can I place an order for MAX11645EUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11645EUA+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 MAX11645EUA+T reliable?
The price and inventory of MAX11645EUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11645EUA+T is usually 5 days.
3.What payment methods are accepted for MAX11645EUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11645EUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11645EUA+T?
MAX11645EUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11645EUA+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 MAX11645EUA+T?
For technical support, including MAX11645EUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11645EUA+T requirements.
6.How does Aetrix verify that MAX11645EUA+T is sourced from the original manufacturer or authorized distributors?
All MAX11645EUA+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 MAX11645EUA+T meets industry standards.
7.What is the process for return or replacement of MAX11645EUA+T?
All MAX11645EUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX11645EUA+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 MAX11645EUA+T part is unused and in its original packaging.
Return procedure for MAX11645EUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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