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Analog Devices Inc./Maxim Integrated MAX1111EEE+T
- Part No.:
- MAX1111EEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1111EEE+T.pdf
- Description:
- IC ADC 8BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,635
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Product details
Overview
MAX1111EEE+T from Maxim Integrated is a low-power, 8-bit, 4-channel analog-to-digital converter (ADC) with integrated track/hold, 2.048V internal reference, SPI/QSPI/MICROWIRE-compatible serial interface, and software-configurable unipolar/bipolar single-ended/differential operation. It operates from a single 2.7V–5.5V supply, draws only 85µA at 50ksps, and supports portable data logging and hand-held measurement systems.
For engineers reviewing the MAX1111EEE+T datasheet, MAX1111EEE+T pinout, MAX1111EEE+T application, or MAX1111EEE+T equivalent, this page delivers verified electrical specs, real-world timing behavior, power-down control logic, analog input configuration modes, and precise ADC performance metrics including ±1 LSB total unadjusted error and 49dB SINAD at 50ksps.
Technical Context
The MAX1111EEE+T implements successive-approximation register (SAR) conversion with an internal track/hold circuit that acquires signals in ≤1µs and supports up to 50ksps sampling. Its flexible serial interface accepts either internal clock (400kHz typical) or external clock (50kHz–500kHz), with SSTRB providing end-of-conversion strobe for interrupt-driven firmware.
Analog input configuration is fully software-defined via an 8-bit control byte: bits SEL2–SEL0 select among four single-ended channels (CH0–CH3) or two differential pairs (CH0/CH1, CH2/CH3); UNI/BIP and SGL/DIF bits set polarity and input topology; PD1/PD0 enable 2µA automatic power-down or SHDN-pin-controlled shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR architecture delivering 256 discrete output codes with no missing codes over temperature. |
| Sampling Rate | Up to 50ksps using external clock; internal clock enables asynchronous readout at processor convenience. |
| Total Unadjusted Error | ±1 LSB (max), ensuring full-scale accuracy without calibration across 0°C to +70°C operating range. |
| Supply Current | 85µA at 50ksps; drops to 6µA in software power-down mode at 1ksps - critical for solar-powered remote sensors. |
| Reference Voltage | 2.048V internal reference (±0.3% initial accuracy, ±50ppm/°C drift), or external 1V–VDD reference support. |
| Input Configuration | 4 single-ended or 2 pseudo-differential analog inputs; COM pin sets zero-code voltage in single-ended mode. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 4-wire interface with MSB-first, falling-edge DOUT timing and CS-controlled tri-state outputs. |
Pinout & Package
The MAX1111EEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), optimized for space-constrained portable instrumentation and battery-powered data acquisition modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4 (CH0–CH3) | Analog Input Channels | Selectable as single-ended inputs or paired as CH0/CH1 and CH2/CH3 differential inputs; each protected by internal clamp diodes. |
| 5 (COM) | Common-Mode Reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion. |
| 10 (SHDN) | Three-Level Shutdown Control | High-impedance default; pulled low → 10µA shutdown; pulled high → disables internal reference while retaining digital logic. |
| 11 (REFIN) | Reference Input | Accepts external 1V–VDD reference; tied to REFOUT to enable internal 2.048V reference. |
| 12 (REFOUT) | Internal Reference Output | Provides 2.048V reference; requires 1µF bypass capacitor to AGND for stability and noise rejection. |
| 13 (AGND) | Analog Ground | Separate ground return for analog circuitry; must be isolated from DGND except at single-point star connection. |
| 14 (DGND) | Digital Ground | Ground reference for serial interface and logic; connects to system digital ground plane. |
| 15 (DOUT) | Serial Data Output | MSB-first 8-bit conversion result; three-stated when CS is high; timing synchronized to SCLK falling edge. |
| 16 (SSTRB) | Serial Strobe Output | Active-high pulse (2 SCLK cycles) before MSB shift-out in external clock mode; low→high transition signals conversion completion in internal clock mode. |
| 17 (DIN) | Serial Data Input | Accepts 8-bit control byte defining channel, polarity, mode, and clock source; tolerant to 5.5V inputs regardless of VDD. |
| 18 (CS) | Chip Select | Active-low enable; controls DOUT tri-state and DIN latching; voltage-tolerant up to 5.5V. |
| 19 (SCLK) | Serial Clock Input | Drives data transfer and (in external mode) conversion timing; 50kHz–500kHz range; 45–55% duty cycle required. |
| 20 (VDD) | Positive Supply | 2.7V–5.5V single supply powering analog core, digital interface, and internal reference; PSR = ±4mV over VDD variation. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (4-channel) or pseudo-differential (2-channel) operation selected via control-byte bits SGL/DIF and UNI/BIP - eliminates hardware rework for sensor interface changes. |
| Low-power operation with dual shutdown | 6µA at 1ksps in automatic software power-down; SHDN pin provides hardware-triggered 10µA shutdown - extends battery life in intermittent-sampling applications. |
| Integrated precision reference | 2.048V internal reference with ±0.3% initial accuracy and ±50ppm/°C tempco - removes need for external reference IC and associated layout complexity. |
| Robust serial interface compatibility | Native SPI/QSPI/MICROWIRE timing with CPOL=0/CPHA=0; 5.5V-tolerant DIN/SCLK/CS pins enable direct interfacing with both 3V and 5V microcontrollers. |
| Track/hold acquisition optimization | tACQ ≤1µs with source impedances <2.4kΩ; acquisition time scales predictably with higher RS via tACQ = 6×(RS + 6.5kΩ)×18pF - enables accurate settling time budgeting in front-end design. |
Applications
| Portable Data Logging | Hand-Held Measurement Devices |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and light intensity at 10ksps intervals over multi-day deployments. IC Role / Device Role / Timing Role: Primary ADC digitizing four analog sensor outputs; internal clock mode decouples conversion timing from host MCU activity to minimize system power. Use Value: 6µA power-down current and 2.048V reference stability enable >1-year battery life with 10-second wake-up intervals and sub-LSB accuracy. |
Use Scenario: Pocket-sized multimeter acquiring DC voltage, current, and resistance readings with auto-ranging and real-time display update. IC Role / Device Role / Timing Role: Signal-chain ADC handling multiplexed front-end measurements; software-configurable unipolar/bipolar mode supports both positive and negative voltage ranges. Use Value: ±1 LSB TUE and 49dB SINAD ensure calibrated accuracy across 4½-digit resolution without factory trimming or external op-amp buffering. |
| Medical Instruments | Solar-Powered Remote Systems |
|
Use Scenario: Portable ECG monitor capturing lead-II differential signals with motion artifact rejection and baseline wander compensation. IC Role / Device Role / Timing Role: Differential-input ADC sampling CH0/CH1 pair at 50ksps; COM pin referenced to mid-supply for bipolar operation. Use Value: Pseudo-differential architecture and ±0.5 LSB COM stability requirement enable clean 12-bit-equivalent dynamic range despite 8-bit resolution. |
Use Scenario: Off-grid agricultural telemetry unit measuring soil moisture, pH, and ambient temperature using energy harvesting and supercapacitor storage. IC Role / Device Role / Timing Role: Low-quiescent ADC enabling ultra-low-duty-cycle operation; SHDN pin synchronizes with solar charge controller to gate conversions during peak irradiance. Use Value: 85µA active current and 52µA at 10ksps allow >5000 conversions per harvested millijoule - maximizing usable data per energy unit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit, 200ksps SAR ADC; 2.7V–5.25V supply; no internal reference; requires external REF and track/hold. | Higher speed but demands more board area and BOM cost for reference and signal conditioning. | Choose ADS7822U only if >50ksps sampling or tighter THD (<−70dB) is required; MAX1111EEE+T reduces component count and layout risk. |
| MCP3004-I/P | 10-bit, 200ksps SAR ADC; SPI-only interface; internal 4.096V reference; 2.7V–5.5V supply; no SHDN pin. | Higher resolution but lacks programmable shutdown and bipolar input support - limits use in low-power or AC-coupled designs. | Prefer MCP3004-I/P when 10-bit resolution is mandatory and power budget allows >300µA continuous draw; MAX1111EEE+T excels in sub-100µA battery operation. |
Compared with ADS7822U and MCP3004-I/P, the MAX1111EEE+T uniquely integrates reference, track/hold, and three-level shutdown in a 16-pin QSOP - delivering lowest system-level component count and smallest PCB footprint for 8-bit portable data acquisition.
Availability
MAX1111EEE+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, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1111EEE+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 high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and portable applications.
The MAX1110/MAX1111 product line was designed specifically for ultra-low-power, multichannel data acquisition in battery- and energy-harvesting–powered systems where integration, supply flexibility, and guaranteed accuracy over temperature are critical.
FAQ
What is the maximum sampling rate supported by the MAX1111EEE+T?
The MAX1111EEE+T supports up to 50ksps when using an external serial clock at 500kHz with 10 clocks per conversion cycle. In internal clock mode, the conversion completes in 25µs (typical), allowing the host processor to read results at its own pace - though effective throughput remains limited by the 50ksps analog bandwidth and 1.5MHz small-signal input bandwidth.
How does the SHDN pin function on the MAX1111EEE+T?
The SHDN pin on the MAX1111EEE+T is a three-level input: left open (high-impedance) enables normal operation; pulled low reduces supply current to ≤10µA; pulled high disables the internal 2.048V reference while keeping digital logic active. This allows selective power gating of the analog section without resetting the serial interface state - a key advantage for wake-on-event architectures using the MAX1111EEE+T.
Can the MAX1111EEE+T operate with an external reference voltage?
Yes, the MAX1111EEE+T accepts an external reference voltage applied to the REFIN pin, ranging from 1V to VDD. When using an external reference, the internal 2.048V reference is disabled, and full-scale input range becomes equal to the applied reference voltage. The device maintains ±1 LSB total unadjusted error performance across the specified operating temperature range regardless of reference source.
What are the analog input voltage limits for the MAX1111EEE+T?
The MAX1111EEE+T analog inputs (CH0–CH3, COM) tolerate voltages from (AGND − 0.3V) to (VDD + 0.3V) due to internal protection diodes. However, for accurate conversions near full scale, input signals must stay within AGND + 50mV to VDD − 50mV. Exceeding these bounds forward-biases protection diodes and risks introducing errors exceeding ±1 LSB or damaging off-channel inputs if current exceeds 2mA.
Is the MAX1111EEE+T compatible with standard SPI interfaces?
Yes, the MAX1111EEE+T is fully compatible with standard SPI interfaces when configured with CPOL = 0 and CPHA = 0 - matching MICROWIRE and QSPI timing. It uses a 4-wire interface (CS, SCLK, DIN, DOUT) with MSB-first, falling-edge DOUT timing. DIN and SCLK accept 5.5V logic levels independent of VDD, enabling seamless interfacing with both 3V and 5V microcontrollers without level-shifting circuitry.
MAX1111EEE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 50k
- Number of Inputs:
- 2, 4
- Input Type:
- 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 ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1111EEE+T FAQ
1.How can I place an order for MAX1111EEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1111EEE+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 MAX1111EEE+T reliable?
The price and inventory of MAX1111EEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1111EEE+T is usually 5 days.
3.What payment methods are accepted for MAX1111EEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1111EEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1111EEE+T?
MAX1111EEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1111EEE+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 MAX1111EEE+T?
For technical support, including MAX1111EEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1111EEE+T requirements.
6.How does Aetrix verify that MAX1111EEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1111EEE+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 MAX1111EEE+T meets industry standards.
7.What is the process for return or replacement of MAX1111EEE+T?
All MAX1111EEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1111EEE+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 MAX1111EEE+T part is unused and in its original packaging.
Return procedure for MAX1111EEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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