MAX117EAI+ - 8-Bit 400 ksps ADC | Maxim Integrated
MPN: MAX117EAI+ ✓ فعالMAX117EAI+ نمای کلی
An analog-to-digital converter, or ADC, converts an analog voltage into a numeric code for processing by a microcontroller, logic circuit, or display controller. The MAX117EAI+ belongs to the flash-converter family of ADCs, combining a sampling architecture with parallel digital outputs. Eight channels allow one converter to monitor multiple sensors, potentiometer positions, or control signals while retaining a direct microprocessor interface.
Key operating characteristics include an 8-bit resolution, eight analog inputs, and a maximum conversion rate of 400 ksps. The converter uses a half-flash technique to achieve its 1.8 µs conversion time. Its single 3 V supply operation simplifies power architecture, while the 1 µA shutdown current helps reduce energy use when the measurement system is inactive.
The parallel output interface exposes the converted value to external digital circuitry and supports microprocessor-compatible system designs. The 28-pin SSOP package is suitable for through-hole assembly and conventional PCB layouts. Because resolution is 8 bits, each ideal conversion code represents one of 256 output levels, making the device appropriate for control, monitoring, and display applications that do not require higher precision.
Typical uses include industrial sensor interfaces, digital potentiometer and potentiometer emulation, panel controls, process monitoring, and embedded control systems. Multiple analog channels can reduce the number of separate converter packages when several low-bandwidth measurements must be acquired. The 400 ksps rate is especially useful when the system needs to update several measured values rapidly.
Designers should verify the analog input range, conversion timing, acquisition requirements, and digital interface timing in the manufacturer datasheet before finalizing the PCB. The supply and reference paths require appropriate bypassing, and unused analog inputs should be handled according to the device guidance. The low-power shutdown function should be controlled so that settling and acquisition timing remain valid after wake-up.
This product page combines the known operating specifications, package information, replacement guidance, and application-oriented design considerations for engineers evaluating the MAX117EAI+. It also distinguishes the directly documented family alternative from options that would require functional or layout verification before use.
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MAX117CAI+
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مشاهده دیتاشیت ←MAX117EAI+ حداکثر مقادیر مجاز و مشخصات الکتریکی
| Device Type | 8-bit flash analog-to-digital converter |
| Analog Input Channels | 8 channels |
| Input Configuration | 8 single-ended inputs |
| رزولوشن | 8 bits |
| Conversion Rate | 400 ksps |
| Conversion Time | 1.8 µs |
| ولتاژ تغذیه | 3 V |
| جریان خاموشی | 1 µA |
| Conversion Architecture | Half-flash |
| نوع رابط | Microprocessor-compatible parallel output |
| بسته‌بندی | 28-pin SSOP |
| نوع نصب | Surface mount |
راهنمای پیکربندی پین MAX117EAI+ 28-pin ssop
پیکربندی پین برای MAX117EAI+ (پکیج 28-pin ssop). این قطعه آنالوگ دارای پین‌های ورودی، خروجی و تغذیه است. برای پیکربندی‌های پین offset null، جبران‌سازی و فعال‌سازی به دیتاشیت سازنده مراجعه کنید. ایده‌آل برای مدارهای شرطی‌سازی سیگنال و تقویت‌کننده.
داده پین‌آوت تفصیلی موجود نیست برای MAX117EAI+.
به دیتاشیت برای پیکربندی کامل پین‌ها.
کاربردهای معمول
MAX117EAI+ مناسب است برای 6 کاربردs: Industrial Sensor Interface, Digital Potentiometer Interface, Process Control Monitoring, Embedded Control System, Panel and Control Interface, Battery-Powered Measurement.
Industrial Sensor Interface
The MAX117EAI+ fits multi-sensor monitoring because it provides eight single-ended analog inputs, 8-bit resolution, and conversion rates up to 400 ksps. It can acquire several control voltages or sensor outputs without requiring a separate converter package for each channel. Its 1.8 µs conversion time supports responsive updates, while the parallel output supports direct connection to microprocessor or logic acquisition circuitry. The 3 V single-supply architecture also simplifies systems that do not require multiple analog rails. Before deployment, confirm that each sensor output remains within the allowed input range and that the required accuracy, noise, and conversion timing are acceptable for the measurement system.
Digital Potentiometer Interface
The eight-channel MAX117EAI+ can monitor the wiper positions of multiple digital potentiometers or programmable resistor networks. Eight-bit resolution gives 256 possible codes, which is suitable for many user-interface and position-control systems where high precision is not essential. The 400 ksps maximum conversion rate allows the controller to refresh several wiper measurements rapidly, and the 1.8 µs conversion time supports high-speed sampling loops. The parallel interface can reduce the need for a serial ADC and associated multiplexing. Firmware should treat each conversion as an 8-bit result and should observe the acquisition and output timing specified in the manufacturer datasheet.
Process Control Monitoring
The MAX117EAI+ is applicable to basic process-control monitoring where several analog variables must be converted for a controller. Eight single-ended inputs can represent temperature, pressure, level, or valve-position signals, and the 400 ksps conversion capability permits frequent updates. The device's 8-bit resolution provides enough levels for coarse control loops, panel displays, and threshold decisions, but it may not suit precision measurement or applications requiring low quantization error. Use the manufacturer datasheet to establish input limits, settling requirements, and timing margins. Shutdown current of 1 µA also makes the converter practical in systems that periodically deactivate unused monitoring sections.
Embedded Control System
The MAX117EAI+ suits embedded controllers that need a simple parallel ADC front end. Its microprocessor-compatible 8-bit output avoids adding a serial communication protocol between the converter and the digital controller, while eight channels consolidate several analog measurements into one package. The 3 V supply and 400 ksps rate align with compact control boards that perform routine thresholding, feedback, or display updates. Software should coordinate the read strobe and conversion timing rather than assume continuous free-running behavior. Confirm the required acquisition interval, input settling, and output enable sequence in the manufacturer datasheet, particularly when converting rapidly changing analog signals.
Panel and Control Interface
Eight single-ended inputs allow the MAX117EAI+ to support multi-axis controls, selector positions, or analog command inputs in a compact panel interface. Its 8-bit resolution is practical for coarse menu navigation, status indicators, and proportional control where human-scale resolution is sufficient. A conversion time of 1.8 µs provides ample throughput for refreshing the interface, and the parallel output can connect directly to a display controller or embedded processor. Labeling, scaling, and calibration should account for the eight-bit code width. The shutdown function can conserve power when the panel is inactive, but the controller must provide adequate settling time before the first valid reading after wake-up.
Battery-Powered Measurement
The MAX117EAI+ can serve intermittently powered measurement systems because it operates from 3 V and offers a 1 µA shutdown mode. Eight channels reduce the component count when a battery-powered device must monitor several analog conditions, while the 400 ksps rate allows quick measurements during an active acquisition interval. The low-power mode is especially useful for periodic sensing, energy-harvested nodes, and portable instruments that spend most of their time asleep. The complete system budget must include regulator quiescent current, digital-interface leakage, and processor activity in addition to the ADC shutdown current. Verify startup timing and signal settling before sampling immediately after power restoration.
داده‌های مرجع مهندسی برای MAX117EAI+ — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | MAX117CAI+ |
|---|---|---|
| Package | 28-pin SSOP | 28-pin SSOP |
| Brand | Maxim Integrated | Maxim Integrated |
| Resolution | 8 bits | 8 bits |
| Analog Input Channels | 8 single-ended inputs | 8 single-ended inputs |
| Conversion Rate | 400 ksps | 400 ksps |
| Conversion Time | 1.8 µs | 1.8 µs |
| Supply Voltage | 3 V | 3 V |
| Shutdown Current | 1 µA | 1 µA |
| Conversion Architecture | Half-flash | Half-flash |
| Digital Interface | Microprocessor-compatible parallel output | Microprocessor-compatible parallel output |
تفاوت‌های کلیدی
- Direct eight-channel parallel ADC functionality (در مقابلMAX117CAI+)
- Low-power shutdown capability (در مقابلMAX117CAI+)
- Exact ordering-code continuity (در مقابلMAX117CAI+)
یادداشت‌های طراحی
Route the eight analog inputs away from digital output and control traces to minimize conversion errors. Keep analog and digital return paths disciplined around the 28-pin SSOP, and place input and reference bypassing according to the manufacturer datasheet. The parallel output can create fast edge currents, so sensitive analog traces should not run directly beneath or alongside those outputs.
Do not treat the 1 µA shutdown specification as the complete device power budget. Include processor, interface, pull-up, regulator, and external-component currents when calculating battery life. Also allow the required wake-up and acquisition interval before the first conversion after shutdown; an early sample may not represent a settled conversion result.
Use the manufacturer timing diagrams to coordinate the read strobe, output enable, and acquisition signals. Short digital traces and a stable 3 V rail are particularly important because the converter provides only 8-bit resolution, leaving limited code margin for timing-induced or supply-induced errors. Avoid adding bus capacitance or extra logic without checking the interface timing limits.
Confirm the 28-pin SSOP footprint, pad dimensions, solder-mask details, and pin-1 orientation against the manufacturer package drawing before layout release. The cross-reference information supports package and terminal consistency for MAX117CAI+, but board designers should still compare the land pattern and every pin function. Preserve component placement access for assembly and inspection.
اطلاعات انطباق
No explicit compliance declarations were identified for the MAX117EAI+. AEC-Q100 is not applicable because this ADC is not presented as an automotive-qualified device.