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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:
- MULTICHANNEL, SERIAL 8-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:1,846
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Product details
Overview
MAX1112EAP from Maxim Integrated is an 8-bit, 8-channel successive-approximation analog-to-digital converter (ADC) with internal track/hold, 4.096V reference, SPI/QSPI/MICROWIRE-compatible serial interface, and software-configurable unipolar/bipolar single-ended/differential input modes. It operates from a single 4.5V–5.5V supply, draws 135µA at 50ksps, and supports industrial temperature range (−40°C to +85°C). It is used in portable data loggers and hand-held measurement devices requiring low-power, multi-channel digitization.
For engineers reviewing the MAX1112EAP datasheet, MAX1112EAP pinout, MAX1112EAP application, or MAX1112EAP equivalent, key selection criteria include its 8-channel single-ended input capability, 135µA active current at 50ksps, −40°C to +85°C operating range, SSOP-20 package, and internal reference-based accuracy of ±1 LSB total unadjusted error.
Technical Context
The MAX1112EAP implements a capacitive DAC-based successive-approximation architecture with integrated track/hold circuitry. Its conversion timing is determined either by an internal 400kHz clock or by an external serial clock up to 2MHz, with acquisition time fixed at 1µs minimum and conversion time of 25µs (internal clock mode) or 10 SCLK cycles (external clock mode).
Input configuration is fully software-controlled via an 8-bit control byte specifying channel selection (CH0–CH7), unipolar/bipolar mode, single-ended/differential mode, and power-down state. The analog front-end supports pseudo-differential sampling with COM-referenced zero-code alignment and ±0.5 LSB COM stability requirement during conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for medium-precision sensor and monitoring applications. |
| Sampling Rate | Up to 50ksps - supports real-time capture of signals up to ~800kHz small-signal bandwidth with undersampling capability. |
| Total Unadjusted Error | ±1 LSB (max), ±0.3 LSB (typ) - ensures monotonicity and <0.4% full-scale accuracy without calibration. |
| Supply Current | 135µA at 50ksps; 13µA in software power-down at 1ksps - enables battery-powered operation with dynamic power scaling. |
| Reference Voltage | Internal 4.096V ±0.8ppm/°C - provides stable full-scale range matching common microcontroller ADC references and simplifies layout. |
| Input Channels | 8 single-ended or 4 differential - enables flexible signal routing for multi-sensor systems without external multiplexers. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 4-wire interface - interoperates with standard MCU peripherals without protocol translation. |
Pinout & Package
The MAX1112EAP is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, optimized for compact industrial PCB layouts and compatible with standard reflow processes.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 5–8 | Analog Input Channels CH0–CH7 | Eight dedicated single-ended inputs; configurable as four differential pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7) via control byte. |
| 9 | COM (Common Reference) | Ground reference for single-ended mode; sets zero-code voltage; must remain stable within ±0.5 LSB during conversion. |
| 10 | SHDN (Shutdown Control) | Three-level input: high-impedance = normal operation; DGND = 10µA shutdown; VDD = internal reference disabled. |
| 11 | REFIN (Reference Input) | Accepts external reference (1V to VDD); tied to REFOUT for internal 4.096V reference use. |
| 12 | REFOUT (Reference Output) | 4.096V buffered reference output; 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) | Digital logic ground; connects to µP ground plane; kept separate from AGND to minimize digital noise coupling. |
| 15 | DOUT (Serial Data Output) | MSB-first 8-bit conversion result; three-state when CS is high; clocked on SCLK falling edge. |
| 16 | SSTRB (Serial Strobe) | End-of-conversion indicator: pulses high for 2 clocks (external mode) or goes low→high (internal mode); used for interrupt-driven reads. |
| 17 | DIN (Serial Data Input) | Receives 8-bit control byte defining channel, mode, polarity, and clock source; sampled on SCLK rising edge. |
| 18 | CS (Chip Select) | Active-low enable for serial interface; disables DOUT and ignores DIN when high; initiates control byte parsing on first '1' after CS fall. |
| 19 | SCLK (Serial Clock) | Drives data transfer and (in external mode) controls conversion speed; duty cycle 45–55%; max 2MHz in internal clock mode. |
| 20 | VDD (Supply Voltage) | 4.5V–5.5V single supply; requires local 0.1µF + 1µF ceramic bypassing to AGND near pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (8 ch) or differential (4 ch) operation selected dynamically via control byte-enables runtime reconfiguration without hardware change. |
| Integrated track/hold and reference | Eliminates need for external sample-and-hold IC and precision reference IC-reduces BOM count and board area by ≥3 components. |
| Low-power automatic shutdown | 13µA at 1ksps via software command or SHDN pin-extends battery life in intermittent-sampling applications like solar-powered remote sensors. |
| Industrial temperature grade | Specified from −40°C to +85°C-ensures reliable operation in harsh environments including factory automation and outdoor instrumentation. |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to common microcontroller serial peripherals with CPOL=0/CPHA=0 settings-no glue logic or firmware abstraction layer required. |
Applications
| Portable Data Logging | Hand-Held Measurement Devices |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over hours or days. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple analog sensor outputs with minimal power overhead and no external reference. Use Value: 135µA active current and 13µA shutdown current extend operational lifetime; 8-channel integration reduces system component count. |
Use Scenario: Field-service multimeter with dual-input capability for voltage, current, and resistance measurements. IC Role / Device Role / Timing Role: High-accuracy, software-selectable ADC supporting both unipolar and bipolar ranges for AC/DC signal capture. Use Value: ±1 LSB TUE and internal 4.096V reference ensure consistent 0.4% full-scale accuracy across operating temperature. |
| Medical Instruments | System Diagnostics |
|
Use Scenario: Portable patient vital-sign monitor acquiring ECG, SpO₂, and respiration waveforms. IC Role / Device Role / Timing Role: Low-noise, multi-channel ADC with pseudo-differential inputs rejecting common-mode interference from body-coupled noise. Use Value: 68dB channel-to-channel crosstalk and −75dB THD support clean waveform acquisition without external filtering. |
Use Scenario: Industrial PLC module monitoring motor voltage, current, and temperature for predictive maintenance. IC Role / Device Role / Timing Role: Embedded ADC providing calibrated analog inputs to microcontroller for real-time fault detection algorithms. Use Value: Software-configurable gain and offset modes allow one hardware design to support multiple sensor types and ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit multi-channel 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; SO-8 package (8-pin) | Higher speed but lacks integrated reference and multi-channel flexibility; suited for single-input high-speed sampling. | Select ADS7822U only when >100ksps sampling is required and external reference infrastructure already exists. |
| MAX1113EEE | Same family, 4-channel variant; identical electrical specs, timing, and interface; QSOP-16 package; shares −40°C to +85°C rating | Reduced channel count (4 vs. 8) and smaller footprint; functionally identical where fewer inputs are needed. | Choose MAX1113EEE when board space is constrained and ≤4 analog inputs suffice-same firmware and layout adaptation effort. |
Compared with MAX1112EAP, the MAX1113EEE offers identical performance in a smaller QSOP-16 package but halves channel count, while the ADS7822U trades integrated reference and software configurability for higher speed and lower supply voltage-neither is pin-compatible, and both require PCB redesign.
Availability
MAX1112EAP is available at Aetrix Electronics and suitable for portable data logging, hand-held measurement devices, and medical instruments 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) designs precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX1112EAP belongs to Maxim's low-power serial ADC product line, engineered for battery-operated and space-constrained systems needing integrated reference, multi-channel flexibility, and guaranteed −40°C to +85°C operation.
FAQ
What is the operating temperature range of the MAX1112EAP?
The MAX1112EAP is rated for continuous operation from −40°C to +85°C. This industrial-grade specification is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, and applies specifically to the MAX1112EAP ordering option-not the commercial-grade MAX1112CAP variant.
Does the MAX1112EAP include an internal voltage reference?
Yes, the MAX1112EAP integrates a precision 4.096V voltage reference with ±0.8ppm/°C temperature coefficient, accessible at the REFOUT pin. When REFIN is connected to REFOUT, the device uses this internal reference; it can also accept external references from 1V to VDD, as specified in the Electrical Characteristics table under "REFOUT Voltage" and "External Reference at REFIN" sections.
How many analog input channels does the MAX1112EAP support?
The MAX1112EAP supports eight analog input channels (CH0–CH7), configurable in software as either eight single-ended inputs or four differential pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7). This 8-channel capability is explicitly stated in the General Description and Functional Diagram, and distinguishes the MAX1112EAP from the 4-channel MAX1113EEE variant.
What serial interface standards does the MAX1112EAP support?
The MAX1112EAP supports SPI, QSPI, and MICROWIRE serial interface standards through its 4-wire interface (CS, SCLK, DIN, DOUT). The datasheet confirms compatibility by specifying CPOL = 0 and CPHA = 0 for SPI mode, and provides dedicated timing diagrams (Figures 6a–6c) for each protocol-ensuring direct connectivity to standard microcontroller peripherals without level-shifting or protocol conversion.
What is the maximum sampling rate of the MAX1112EAP?
The MAX1112EAP achieves a maximum sampling rate of 50ksps when using an external 500kHz serial clock, as verified in the Electrical Characteristics table under "CONVERSION RATE" and confirmed in the General Description. At this rate, supply current is 135µA; the device maintains ±1 LSB total unadjusted error and 49dB SINAD across the full −40°C to +85°C range.
MAX1112EAP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 50k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- 4-Wire, Microwire, QSPI, 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:
- 4.5V ~ 5.5V
- Voltage - Supply, Digital:
- 4.5V ~ 5.5V
- 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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