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Analog Devices Inc./Maxim Integrated MAX1111EPE+
- Part No.:
- MAX1111EPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1111EPE+.pdf
- Description:
- IC ADC 8BIT SAR 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,091
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Product details
Overview
MAX1111EPE+ 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–5.5V supply and draws only 85µA at 50ksps sampling rate, making it suitable for portable data loggers and hand-held measurement devices.
For engineers reviewing the MAX1111EPE+ datasheet, MAX1111EPE+ pinout, MAX1111EPE+ application, or MAX1111EPE+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the MAX1111EPE+ in its 16-pin QSOP package.
Technical Context
The MAX1111EPE+ uses successive-approximation (SAR) architecture with an internal track/hold circuit enabling up to 50ksps sampling. Its conversion timing is governed by either an internal 400kHz clock or an external serial clock (50kHz–2MHz), with acquisition time as low as 1µs and aperture jitter under 50ps.
It supports four single-ended or two differential analog inputs via software-configurable control byte (8-bit), with full-scale range set by internal 2.048V reference or external 1V–VDD reference. Input common-mode range spans AGND to VDD, and digital I/O tolerates 5.5V signals independent of VDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR - delivers 256 discrete output codes with no missing codes over temperature. |
| Sampling Rate | Up to 50ksps - enables real-time monitoring of fast transients in solar-powered remote sensors. |
| Total Unadjusted Error | ±1 LSB (max), ±0.3 LSB (typ) - ensures accurate digitization without factory calibration in medical instruments. |
| Supply Current | 85µA at 50ksps; 6µA in software power-down - extends battery life in 4–20mA loop-powered systems. |
| Reference Voltage | Internal 2.048V ±0.8% (REFOUT), or external 1V–VDD - allows precise scaling for 0–2.048V or bipolar ±1.024V inputs. |
| Input Configuration | 4 single-ended or 2 pseudo-differential channels - supports flexible sensor interfacing in system diagnostics. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 4-wire protocol - simplifies integration with ARM Cortex-M and legacy 8-bit µCs. |
Pinout & Package
The MAX1111EPE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for space-constrained portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, CH0–CH3 | Analog Input Channels | Four single-ended or two differential input pairs; COM referenced for zero-code alignment. |
| 5, COM | Common-Mode Reference | Ground reference for single-ended mode; must be stable to ±0.5 LSB for full accuracy. |
| 6, REFIN | Reference Input | Accepts internal REFOUT (2.048V) or external 1V–VDD reference; sets full-scale range. |
| 7, REFOUT | Internal Reference Output | 2.048V ±0.8% output; requires 1µF bypass capacitor to AGND for stability and noise rejection. |
| 8, AGND | Analog Ground | Separate ground return for analog circuitry; must be isolated from DGND to minimize noise coupling. |
| 9, DGND | Digital Ground | Return path for serial interface and logic; connected to AGND at single point near device. |
| 10, SHDN | Three-Level Shutdown Control | Pulled low → 10µA shutdown; high impedance → normal operation; pulled high → reference disabled. |
| 11, DOUT | Serial Data Output | MSB-first, SCLK-falling-edge aligned; high-impedance when CS = high - enables bus sharing. |
| 12, SSTRB | Serial Strobe Output | Signals end-of-conversion: pulses high (2×SCLK) in external mode; goes high after 25µs in internal mode. |
| 13, CS | Active-Low Chip Select | Enables serial interface; DOUT enters high-Z when CS = high - supports multi-device SPI buses. |
| 14, SCLK | Serial Clock Input | Drives data transfer and (in external mode) conversion timing; accepts 50kHz–2MHz, 45–55% duty cycle. |
| 15, DIN | Serial Data Input | Accepts 8-bit control byte (START, SELx, UNI/BIP, SGL/DIF, PD1/PD0); tolerant to 5.5V inputs. |
| 16, VDD | Positive Supply | 2.7V–5.5V single supply; powers analog and digital sections; PSR = ±4mV over 2.7V–3.6V range. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended/differential and unipolar/bipolar selection via 8-bit control byte - eliminates hardware rework across sensor types. |
| Internal track/hold with 1µs acquisition | Enables accurate sampling of high-Z sources (<2.4kΩ source impedance has negligible AC error) - reduces need for external op-amp buffers. |
| 2.048V internal reference | ±0.8% initial accuracy and ±50ppm/°C drift - provides stable full-scale scaling without external precision reference ICs. |
| 5.5V-tolerant digital I/O | CS, SCLK, DIN accept 5.5V regardless of VDD - allows direct interfacing with 5V µCs while operating from 3.3V supply. |
| Interrupt-capable SSTRB output | Provides hardware end-of-conversion signal - enables interrupt-driven firmware, reducing polling overhead in low-power sleep cycles. |
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 using single-ended mode and internal reference. Use Value: 85µA active current and 6µA power-down extend 2xAA battery life beyond 12 months. |
Use Scenario: Pocket-sized multimeter measuring DC voltage, current, and resistance with auto-ranging. IC Role / Device Role / Timing Role: Configured in differential mode to reject common-mode noise from probe leads during precision voltage measurements. Use Value: ±1 LSB TUE and 49dB SINAD ensure 3½-digit accuracy without post-calibration. |
| Medical Instruments | Solar-Powered Remote Systems |
Use Scenario: Portable pulse oximeter acquiring analog photodiode signals for SpO₂ calculation. IC Role / Device Role / Timing Role: Samples dual-channel red/IR LED signals synchronously using internal clock mode to decouple conversion timing from µC load. Use Value: 25µs internal conversion time and SSTRB-driven interrupt enable deterministic sampling at 100Hz. |
Use Scenario: Off-grid weather station powered by 6V solar panel + supercapacitor, transmitting data hourly via LoRaWAN. IC Role / Device Role / Timing Role: Digitizes thermistor, anemometer, and rain gauge outputs in low-duty-cycle bursts. Use Value: Software power-down reduces quiescent draw to 6µA between samples - critical for energy harvesting viability. |
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, 2.7–5.5V, SPI-only interface, no internal reference - requires external 2.048V ref. | Higher speed but lacks software-configurable bipolar mode and internal track/hold - less suited for low-noise sensor front-ends. | Choose ADS7822U only if >50ksps sampling is required and external reference is acceptable. |
| MCP3004-I/P | 10-bit, 200ksps, 2.7–5.5V, SPI interface, internal 4.096V ref - higher resolution but larger package (14-pin PDIP). | Offers 10-bit resolution but consumes 500µA at 200ksps - unsuitable for ultra-low-power battery applications. | Choose MCP3004-I/P when resolution >8-bit is mandatory and power budget allows ~6× higher active current. |
Compared with ADS7822U and MCP3004-I/P, the MAX1111EPE+ uniquely balances ultra-low power (6–85µA), integrated 2.048V reference, flexible input configuration, and QSOP footprint - making it optimal for size- and energy-constrained portable instrumentation where 8-bit resolution suffices.
Availability
MAX1111EPE+ is available at Aetrix Electronics and suitable for portable data logging, hand-held measurement devices, and solar-powered remote systems requiring stable component supply across extended production lifecycles.
Supply support for MAX1111EPE+ 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 portable applications.
The MAX1111EPE+ belongs to Maxim's low-power serial ADC product line, engineered specifically for battery-operated instrumentation where integration, accuracy, and microamp-level power efficiency are critical.
FAQ
What is the maximum sampling rate of the MAX1111EPE+?
The MAX1111EPE+ achieves up to 50ksps when using an external 500kHz serial clock. In internal clock mode, the conversion time is fixed at 25µs (typ), yielding ~40ksps effective rate. The device guarantees no missing codes and ±1 LSB total unadjusted error across this full range, making it suitable for dynamic signal capture in handheld test equipment where the MAX1111EPE+ serves as the primary digitizer.
Does the MAX1111EPE+ require an external reference voltage?
No - the MAX1111EPE+ includes a precision 2.048V internal reference (REFOUT) with ±0.8% initial accuracy and ±50ppm/°C temperature coefficient. REFOUT must be bypassed with a 1µF capacitor to AGND. An external reference (1V–VDD) may be applied to REFIN for custom full-scale ranges, but it is not required. This integrated reference eliminates BOM cost and board area for the MAX1111EPE+ in space-constrained designs.
How does the SHDN pin function on the MAX1111EPE+?
The SHDN pin on the MAX1111EPE+ is a three-level input: high-impedance enables normal operation; pulled low reduces supply current to ≤10µA; pulled high disables the internal reference while keeping digital logic active. Unlike simple on/off shutdown, this flexibility allows selective power gating - for example, disabling the reference during standby while retaining register state, which accelerates wake-up in systems using the MAX1111EPE+ for periodic sensor reads.
Can the MAX1111EPE+ interface directly with a 5V microcontroller?
Yes - the MAX1111EPE+ digital pins (CS, SCLK, DIN) tolerate input voltages up to 5.5V regardless of VDD, enabling direct connection to 5V µCs even when the MAX1111EPE+ operates from 3.3V. DOUT and SSTRB are CMOS-compatible and swing rail-to-rail. No level-shifting circuitry is needed, simplifying hardware design and improving reliability in mixed-voltage systems using the MAX1111EPE+.
What is the purpose of the SSTRB output on the MAX1111EPE+?
The SSTRB (Serial Strobe) output on the MAX1111EPE+ provides hardware notification of conversion completion: in external clock mode, it pulses high for two SCLK periods before MSB output; in internal clock mode, it goes low at conversion start and high at completion (~25µs later). This signal enables interrupt-driven firmware, eliminating polling and reducing µC active time - a key advantage for battery life in applications deploying the MAX1111EPE+ in portable medical or environmental monitors.
MAX1111EPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1111EPE+ FAQ
1.How can I place an order for MAX1111EPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1111EPE+ 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 MAX1111EPE+ reliable?
The price and inventory of MAX1111EPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1111EPE+ is usually 5 days.
3.What payment methods are accepted for MAX1111EPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1111EPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1111EPE+?
MAX1111EPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1111EPE+ 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 MAX1111EPE+?
For technical support, including MAX1111EPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1111EPE+ requirements.
6.How does Aetrix verify that MAX1111EPE+ is sourced from the original manufacturer or authorized distributors?
All MAX1111EPE+ 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 MAX1111EPE+ meets industry standards.
7.What is the process for return or replacement of MAX1111EPE+?
All MAX1111EPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1111EPE+, 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 MAX1111EPE+ part is unused and in its original packaging.
Return procedure for MAX1111EPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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