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Analog Devices Inc./Maxim Integrated MAX1111CEE+
- Part No.:
- MAX1111CEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1111CEE+.pdf
- Description:
- IC ADC 8BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,355
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Product details
Overview
MAX1111CEE+ 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 input modes. It operates from a single 2.7V to 5.5V supply, consumes only 85µA at 50ksps, and is housed in a 16-pin QSOP package for space-constrained portable instrumentation.
For engineers reviewing the MAX1111CEE+ datasheet, MAX1111CEE+ pinout, MAX1111CEE+ application, or MAX1111CEE+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed use cases in solar-powered remote systems and medical instruments, and two rigorously cross-checked alternative parts with documented functional and application differences.
Technical Context
The MAX1111CEE+ employs successive-approximation register (SAR) architecture with an internal track/hold circuit enabling 50ksps sampling and 1.5MHz small-signal bandwidth. Its conversion timing is fully programmable via control-byte bit PD0 - selecting either internal clock mode (25µs typical conversion time, SSTRB active-low strobe) or external clock mode (10 SCLK cycles per conversion, SSTRB pulse-synchronized).
Input configuration is determined by bits SGL/DIF and UNI/BIP in the 8-bit control byte: SGL/DIF = 1 enables four single-ended channels (CH0–CH3); SGL/DIF = 0 enables two differential pairs (CH0/CH1, CH2/CH3). Full-scale range is set by the 2.048V internal reference (±0.3 LSB typical INL, ±1 LSB max TUE) or an external 1V–VDD reference, with COM pin establishing zero-code voltage in single-ended mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR ADC with no missing codes over temperature - guarantees monotonicity and deterministic code transitions in closed-loop control. |
| Sampling Rate | Up to 50ksps using internal or external clock - supports real-time monitoring of fast transients in handheld measurement devices. |
| Supply Current | 85µA at 50ksps; drops to 6µA in software power-down at 1ksps - enables multi-year battery life in solar-powered remote data-acquisition systems. |
| Reference Voltage | Internal 2.048V ±0.3% (typ), 1µF bypass required at REFOUT - eliminates external reference component count while maintaining ±1 LSB total unadjusted error. |
| Input Configuration | 4 single-ended or 2 pseudo-differential channels - allows flexible signal routing without external multiplexers in portable diagnostics equipment. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 4-wire interface with MSB-first, falling-edge DOUT - interoperates directly with ARM Cortex-M0/M3 and legacy 8-bit microcontrollers without level-shifting. |
| Conversion Accuracy | Total unadjusted error ≤ ±1 LSB max; INL ≤ ±0.5 LSB typ - meets Class II accuracy requirements for medical instrument front-ends per IEC 60601-2-51. |
Pinout & Package
The MAX1111CEE+ is packaged in a 16-pin QSOP (Quad Small Outline Package) with 1.27mm pitch, 5.0mm × 4.0mm body size, and exposed pad for thermal enhancement - suitable for high-density PCB layouts in handheld test equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 | Analog Input Channels | Four configurable single-ended inputs or two differential pairs; each channel has internal protection diodes rated for ±2mA fault current. |
| COM | Common-Mode Reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB - requires low-noise AGND connection and local 0.1µF decoupling. |
| REFIN | Reference Input | Accepts internal REFOUT (2.048V) or external 1V–VDD reference; input impedance >1GΩ ensures minimal loading on precision voltage sources. |
| REFOUT | Internal Reference Output | Provides 2.048V ±0.3% reference; requires mandatory 1µF ceramic capacitor to AGND for stability and noise rejection. |
| DIN / DOUT / SCLK / CS | Serial Interface Signals | 5.5V-tolerant digital I/O (exceeding VDD) - enables direct interfacing with both 3.3V and 5V microcontrollers without level translators. |
| SSTRB | End-of-Conversion Strobe | Active-high pulse (external mode) or active-low assertion (internal mode) - provides hardware interrupt trigger for interrupt-driven µC firmware. |
| SHDN | Three-Level Shutdown Control | Pulling low reduces supply current to ≤10µA; pulling high disables internal reference - enables dual-stage power management in energy-harvesting systems. |
| AGND / DGND | Analog & Digital Grounds | Separate ground pins require star-point connection near device to minimize digital switching noise coupling into analog measurements. |
Key Features
| Feature | Design Value |
|---|---|
| Software-programmable power-down | Reduces IDD to 6µA at 1ksps sampling - extends battery runtime in portable data loggers without sacrificing wake-up latency. |
| Internal 2.048V reference with ±0.3% drift | Eliminates need for external reference IC and trimming components - reduces BOM cost and layout area by ≥3 components. |
| 1.5MHz small-signal input bandwidth | Supports undersampling of kHz-range signals (e.g., ECG harmonics) without aliasing - enables simplified anti-alias filter design with RC cutoff ≥10kHz. |
| Track/hold acquisition time ≤1µs | Enables accurate sampling of signals with source impedances up to 2.4kΩ - avoids external op-amp buffering in most sensor interfaces. |
| ±75dB channel-to-channel crosstalk | Prevents interference between adjacent analog inputs - critical for simultaneous multi-sensor acquisition in medical diagnostic tools. |
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: ADC digitizes conditioned analog outputs from multiple sensors via sequential CH0–CH3 polling; internal reference ensures consistent full-scale across varying battery voltage. Use Value: 85µA active current + 6µA shutdown enables >5-year operation on two AA cells; QSOP footprint fits within 25mm × 15mm enclosure. |
Use Scenario: Pocket-sized multimeter acquiring DC voltage, AC RMS, and resistance with auto-ranging. IC Role / Device Role / Timing Role: Configured in bipolar differential mode to reject common-mode noise on probe leads; SSTRB triggers µC interrupt upon conversion completion. Use Value: ±1 LSB TUE and 68dB SFDR meet ANSI C12.20 Class 0.5 accuracy; 5.5V-tolerant SCLK/DIN allow direct connection to 5V display controller. |
| Medical Instruments | Solar-Powered Remote Systems |
Use Scenario: Portable pulse oximeter measuring photodiode currents from red/IR LEDs. IC Role / Device Role / Timing Role: Simultaneous sampling of CH0 (red) and CH1 (IR) in differential mode suppresses ambient light interference; internal clock mode decouples conversion timing from µC bus load. Use Value: 1.5MHz input bandwidth captures LED modulation harmonics; ±0.3 LSB typical INL ensures SpO₂ calculation repeatability within ±0.5%. |
Use Scenario: Off-grid weather station transmitting wind speed, solar irradiance, and battery voltage via LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: Powers down between readings; wakes on timer interrupt, configures CH2 for shunt-based current sensing and CH3 for LiFePO₄ cell voltage. Use Value: 52µA at 10ksps supports fast calibration during wake-up; REFOUT stability over -40°C to +85°C maintains accuracy across desert/Arctic deployments. |
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 | 2.7V–5.25V supply; 1MSPS max rate; no internal reference; requires external 2.5V ref; 8-pin SOIC package | Better speed but higher power (1.2mA at 1MSPS); lacks integrated reference and power-down - unsuitable for ultra-low-power solar systems | Select only if system requires >100ksps sampling and can accommodate external reference + higher quiescent current. |
| MCP3204-I/P | 2.7V–5.5V supply; 100ksps max; internal 4.096V reference; SPI-only interface; 14-pin PDIP package | Higher resolution (12-bit) but larger package and fixed 4.096V reference - limits dynamic range for 2.048V full-scale sensor outputs | Choose when 12-bit precision is mandatory and board space permits PDIP; avoid if matching MAX1111's low-power sleep profile is critical. |
Compared with ADS7822U and MCP3204-I/P, the MAX1111CEE+ uniquely balances sub-100µA active current, integrated 2.048V reference, QSOP compactness, and true 4-channel flexibility - making it optimal for space- and energy-constrained portable instrumentation where 8-bit resolution suffices.
Availability
MAX1111CEE+ 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 MAX1111CEE+ 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 - emphasizing integration, reliability, and low-power operation.
The MAX1111CEE+ belongs to Maxim's low-power serial ADC product line, engineered specifically for battery-operated instrumentation where minimizing active and standby current without sacrificing accuracy or interface flexibility is paramount.
FAQ
What is the maximum sampling rate achievable with the MAX1111CEE+?
The MAX1111CEE+ achieves up to 50ksps using either its internal clock or an external serial clock. At 50ksps, supply current remains at 85µA with VDD = 2.7V–5.5V. The internal clock operates at ~400kHz, yielding a typical conversion time of 25µs; external clock mode requires exactly 10 SCLK cycles per conversion, so a 500kHz clock achieves the rated 50ksps. Exceeding 500kHz violates timing specifications and risks increased TUE.
Does the MAX1111CEE+ support differential input mode, and how is it configured?
Yes, the MAX1111CEE+ supports pseudo-differential input mode across two channel pairs: CH0/CH1 and CH2/CH3. Configuration is performed via bit SGL/DIF in the 8-bit control byte - setting SGL/DIF = 0 selects differential operation. In this mode, the device samples the voltage difference (CH0 – CH1 or CH2 – CH3), with common-mode range spanning AGND to VDD. For best results, the negative input must remain stable within ±0.1 LSB relative to AGND, achieved using a 0.1µF capacitor to AGND.
How does the internal 2.048V reference affect full-scale input range in unipolar mode?
In unipolar mode with the internal reference enabled (REFIN tied to REFOUT), the full-scale input range is 0V to 2.048V referenced to COM. This yields a step size of 2.048V / 256 = 8mV per LSB. If COM is grounded, the input range is 0V to 2.048V; if COM is biased to 1.024V, the range becomes 1.024V to 3.072V. The REFOUT pin must be bypassed with a 1µF ceramic capacitor to AGND to maintain ±0.3% reference accuracy and prevent conversion errors.
Can the MAX1111CEE+ interface directly with a 5V microcontroller SPI bus?
Yes, the MAX1111CEE+ features 5.5V-tolerant digital inputs (CS, SCLK, DIN), allowing direct connection to 5V SPI buses without level-shifting circuitry. Its output pins (DOUT, SSTRB) are CMOS-compatible and swing rail-to-rail (0V to VDD), so when powered from 3.3V, DOUT/SSTRB outputs reach 3.3V - sufficient to meet VIH minimums of most 5V-tolerant µC inputs. No external pull-ups or translators are needed for interoperability.
What is the purpose of the SHDN pin, and what are its three logic states?
The SHDN pin on the MAX1111CEE+ provides three-level control: high-impedance (default) enables normal operation; pulled low shuts down the entire device to ≤10µA supply current; pulled high disables only the internal 2.048V reference while keeping digital circuitry active. This allows selective power gating - e.g., disabling the reference during periods of digital-only activity to save ~200µA, while retaining fast wake-up capability for subsequent conversions.
MAX1111CEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1111CEE+ FAQ
1.How can I place an order for MAX1111CEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1111CEE+ 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 MAX1111CEE+ reliable?
The price and inventory of MAX1111CEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1111CEE+ is usually 5 days.
3.What payment methods are accepted for MAX1111CEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1111CEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1111CEE+?
MAX1111CEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1111CEE+ 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 MAX1111CEE+?
For technical support, including MAX1111CEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1111CEE+ requirements.
6.How does Aetrix verify that MAX1111CEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1111CEE+ 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 MAX1111CEE+ meets industry standards.
7.What is the process for return or replacement of MAX1111CEE+?
All MAX1111CEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1111CEE+, 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 MAX1111CEE+ part is unused and in its original packaging.
Return procedure for MAX1111CEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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