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Analog Devices Inc./Maxim Integrated MAX1112EAP+
- Part No.:
- MAX1112EAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1112EAP+.pdf
- Description:
- IC ADC 8BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:210
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Product details
Overview
The MAX1112EAP+ from Maxim Integrated is an 8-bit, 8-channel successive-approximation analog-to-digital converter (ADC) with integrated track/hold, 4.096V internal reference, SPI/QSPI/MICROWIRE-compatible serial interface, and software-configurable unipolar/bipolar and single-ended/differential input modes. It operates from a single 4.5V–5.5V supply, draws only 135µA at 50ksps, and supports industrial temperature range (−40°C to +85°C). It is used in portable data loggers and solar-powered remote sensing systems requiring low-power, multi-channel digitization.
For engineers reviewing the MAX1112EAP+ datasheet, MAX1112EAP+ pinout, MAX1112EAP+ application, or MAX1112EAP+ equivalent, key selection considerations include its 8-channel single-ended / 4-channel differential input flexibility, 13µA power-down current at 1ksps, ±1 LSB total unadjusted error, 50ksps max sampling rate, and SSOP-20 package compatibility with space-constrained embedded measurement designs.
Technical Context
The MAX1112EAP+ uses a capacitive DAC-based successive-approximation architecture with an internal track/hold circuit that acquires input signals in ≤1µs and completes conversion in 25µs (internal clock mode) or 10 SCLK cycles (external clock mode). Its analog front-end supports pseudo-differential sampling with COM-referenced inputs and configurable common-mode voltage ranging from AGND to VDD.
Conversion control is managed via an 8-bit software-programmable control byte defining channel selection (CH0–CH7), unipolar/bipolar mode, single-ended/differential mode, and clock/power-down settings. The serial interface operates synchronously with SCLK falling-edge data output and rising-edge data input, supporting both interrupt-driven (via SSTRB strobe) and polled readout architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital codes for precise low-to-mid-speed signal digitization |
| Sampling Rate | Up to 50ksps - enables real-time monitoring of sensor outputs in battery-operated field instruments |
| Total Unadjusted Error | ±1 LSB (max), ±0.3 LSB (typ) - ensures accurate calibration-free measurements across industrial temperature range |
| Supply Current | 135µA at 50ksps; 13µA in software power-down at 1ksps - extends battery life in portable and remote deployments |
| Reference Voltage | Internal 4.096V ±0.8 ppm/°C - provides stable full-scale scaling without external precision reference components |
| Input Configuration | 8 single-ended or 4 differential channels - supports flexible sensor interfacing including thermocouples, RTDs, and bridge transducers |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 4-wire protocol - simplifies integration with ARM Cortex-M, PIC, and legacy microcontrollers |
Pinout & Package
The MAX1112EAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, optimized for compact PCB layouts in handheld and distributed sensing applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 20) | Positive supply input | Accepts 4.5V–5.5V; requires local 0.1µF + 1µF bypassing to AGND for noise-sensitive ADC operation |
| AGND (Pin 13) | Analog ground reference | Must be separated from DGND and tied at single point to minimize ground bounce in mixed-signal systems |
| DGND (Pin 14) | Digital ground reference | Provides return path for serial interface and logic circuits; isolation from AGND reduces digital switching noise coupling |
| CH0–CH7 (Pins 1–4, 5–8) | Analog input channels | Software-selectable 8 single-ended or 4 differential inputs; CH4–CH7 available only on MAX1112 family |
| COM (Pin 9) | Common-mode reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5 LSB during conversion |
| REFIN (Pin 11) | Reference voltage input | Connect to REFOUT for internal 4.096V reference; accepts external 1V–VDD reference for custom full-scale ranges |
| REFOUT (Pin 12) | Internal reference output | Provides buffered 4.096V reference; requires 1µF capacitor to AGND for stability and settling |
| CS (Pin 18) | Active-low chip select | Enables serial interface; DOUT enters high-impedance state when CS is high to allow bus sharing |
| SCLK (Pin 19) | Serial clock input | Drives data transfer and (in external clock mode) controls conversion timing; supports up to 2MHz in internal clock mode |
| DIN (Pin 17) | Serial data input | Receives 8-bit control byte on SCLK rising edge; first logic "1" defines MSB start bit for flexible framing |
| DOUT (Pin 15) | Serial data output | Outputs 8-bit conversion result on SCLK falling edge in MSB-first format; high-impedance when CS is high |
| SSTRB (Pin 16) | Serial strobe output | Signals end-of-conversion: pulses high for two clocks (external mode) or goes high after 25µs (internal mode) for interrupt use |
| SHDN (Pin 10) | Three-level shutdown input | High-impedance = active; pulled low = 10µA shutdown; pulled high = internal reference disabled |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Single-ended/differential and unipolar/bipolar selection via control byte - eliminates hardware rework for varying sensor types |
| Integrated track/hold and reference | Eliminates need for external sample-hold amplifier and precision voltage reference - reduces BOM count and layout area |
| Low-power automatic shutdown | 13µA at 1ksps with software-triggered entry - enables duty-cycled acquisition in energy-harvesting systems |
| Flexible serial interface timing | Supports both internal clock (25µs fixed conversion) and external clock (10-cycle programmable) modes - decouples ADC timing from MCU clock constraints |
| Robust analog input protection | Clamp diodes allow −0.3V to VDD+0.3V input swing without damage - enhances reliability in noisy industrial environments |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over 72-hour intervals. IC Role / Device Role / Timing Role: Primary ADC digitizing 8 analog sensor outputs with synchronized sampling and low-latency serial readout. Use Value: 135µA active current and 13µA shutdown current extend operational life beyond 12 months on two AA cells. |
Use Scenario: Handheld blood glucose meter with electrochemical test strip interface and LCD display. IC Role / Device Role / Timing Role: Signal conditioner and digitizer for amperometric current measurement across variable strip impedance. Use Value: ±1 LSB TUE and software-selectable bipolar mode enable accurate low-current detection without factory calibration. |
| Solar-Powered Remote Monitoring | Industrial System Diagnostics |
Use Scenario: Off-grid solar telemetry unit measuring panel voltage, battery SOC, and load current in desert deployment. IC Role / Device Role / Timing Role: Multi-channel front-end ADC acquiring DC parameters with automatic power cycling between readings. Use Value: Internal 4.096V reference ensures consistent full-scale accuracy despite wide VDD variation (4.5V–5.5V). |
Use Scenario: PLC I/O module monitoring motor winding resistance, coolant temperature, and vibration sensor outputs. IC Role / Device Role / Timing Role: Local digitizer for analog diagnostics channels, reducing noise-prone long-line analog transmission. Use Value: 8-channel single-ended capability consolidates multiple 4–20mA loop receivers into one compact SSOP-20 footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit multi-channel serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply; 1MSPS max rate; no internal reference; requires external REF | Better speed but higher power (1.2mA); lacks integrated track/hold and reference | Select for higher throughput where external reference and layout area are acceptable |
| MAX1113EAE+ | 16-pin QSOP; 4 single-ended / 2 differential channels; identical core architecture and specs | Reduced channel count; smaller footprint; same power/performance per channel | Select when only 4 analog inputs are needed and board space is critical |
Compared with the MAX1112EAP+, the ADS7822U offers higher speed but demands external support components and consumes ~9× more active current, while the MAX1113EAE+ provides identical performance in half the pin count and area-making it ideal for scaled-down channel requirements.
Availability
The MAX1112EAP+ is available at Aetrix Electronics and suitable for portable instrumentation, solar-powered telemetry, and industrial diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1112EAP+ 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 design house specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX1112EAP+ belongs to Maxim's precision low-power ADC product line, engineered specifically for battery- and energy-harvesting–powered measurement systems needing integrated signal conditioning and minimal external components.
FAQ
What is the operating temperature range of the MAX1112EAP+?
The MAX1112EAP+ is rated for industrial operation from −40°C to +85°C, as confirmed by its EAP suffix designation and Absolute Maximum Ratings table. This range ensures reliable performance in outdoor sensor enclosures, factory-floor equipment, and automotive under-hood auxiliary modules where ambient temperatures exceed commercial-grade limits. The MAX1112EAP+ maintains ±1 LSB total unadjusted error across this full span.
Does the MAX1112EAP+ require an external reference voltage?
No, the MAX1112EAP+ includes a precision 4.096V internal reference with ±0.8 ppm/°C temperature coefficient, eliminating the need for external reference components in most applications. REFOUT is internally connected to REFIN by default; users may override it with an external 1V–VDD reference if custom full-scale scaling is required. The internal reference is factory-trimmed and contributes directly to the ±1 LSB TUE specification.
How many analog input channels does the MAX1112EAP+ support?
The MAX1112EAP+ supports eight analog input channels (CH0–CH7), configurable as either eight single-ended inputs or four differential pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7). This dual-mode flexibility is controlled entirely via software using bits SGL/DIF and SEL0–SEL2 in the 8-bit control byte. The MAX1112EAP+ pinout physically exposes all eight channels, distinguishing it from the 4-channel MAX1113 variant.
What serial interface standards is the MAX1112EAP+ compatible with?
The MAX1112EAP+ features a 4-wire SPI-compatible serial interface that meets MICROWIRE™, SPI™, and QSPI™ timing and protocol requirements. It uses CS, SCLK, DIN, and DOUT signals with MSB-first data transfer, supports CPOL=0/CPHA=0 configuration, and provides SSTRB as an end-of-conversion strobe for interrupt-driven firmware. No level-shifting or protocol translation is needed when interfacing with standard microcontroller SPI peripherals.
Can the MAX1112EAP+ operate in power-down mode, and how is it controlled?
Yes, the MAX1112EAP+ supports two independent power-down mechanisms: software-controlled (via PD1/PD0 bits in the control byte) and hardware-controlled (via the SHDN pin). Software power-down reduces supply current to 13µA at 1ksps sampling, while pulling SHDN low achieves ≤10µA shutdown. Both methods retain register state and allow wake-up in <1µs, making them suitable for burst-mode acquisition in ultra-low-power systems.
MAX1112EAP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 50k
- Number of Inputs:
- 4, 8
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1112EAP+ FAQ
1.How can I place an order for MAX1112EAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1112EAP+ 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 MAX1112EAP+ reliable?
The price and inventory of MAX1112EAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1112EAP+ is usually 5 days.
3.What payment methods are accepted for MAX1112EAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1112EAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1112EAP+?
MAX1112EAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1112EAP+ 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 MAX1112EAP+?
For technical support, including MAX1112EAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1112EAP+ requirements.
6.How does Aetrix verify that MAX1112EAP+ is sourced from the original manufacturer or authorized distributors?
All MAX1112EAP+ 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 MAX1112EAP+ meets industry standards.
7.What is the process for return or replacement of MAX1112EAP+?
All MAX1112EAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1112EAP+, 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 MAX1112EAP+ part is unused and in its original packaging.
Return procedure for MAX1112EAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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