MAX118EAI+ - 8-Bit 8-Channel 1Msps ADC | Analog Devices
MPN： MAX118EAI+ ✓ 啟用中MAX118EAI+ 概覽
A flash ADC is a parallel-input data converter that uses multiple internal comparators to convert an analog voltage into a digital code in one conversion cycle. The MAX118 family provides microprocessor-compatible 4-channel and 8-channel options for designers who need rapid sampling without the complexity of a serial data interface. Its 1µA power-down mode makes it especially useful when the acquisition circuit must remain available while consuming very little standby power.
The MAX118EAI+ provides eight 8-bit conversion channels, a 1Msps conversion rate, an external reference, and an active-low power-down input. The parallel output arrangement can connect directly to a suitable microprocessor, microcontroller, FPGA, or input/output interface. The 28-SSOP package offers more input and control pins than small serial-interface ADC packages, making careful PCB planning important for signal routing and grounding.
Its half-flash architecture supports a typical conversion time of 660ns, equivalent to a throughput of 1Msps. The eight-bit resolution provides 256 code levels per input, making the converter appropriate for position sensing, simple process monitoring, digital potentiometer feedback, industrial control, and embedded data acquisition. Conversion timing, input settling, reference stability, and the acquisition system’s bandwidth must be evaluated together when interpreting sampled results.
Typical uses include industrial control panels, multichannel sensor interfaces, battery-powered monitoring equipment, laboratory measurement systems, and microcontroller-based instrumentation. The active-low power-down feature can disable the converter during idle periods and return it to normal operation in less than 200ns, according to the manufacturer’s MAX118 product page.
Design the MAX118EAI+ around a low-impedance reference, short analog input paths, and a quiet return plane. Place input and reference decoupling close to the device, route digital output traces away from sensitive analog inputs, and account for logic levels when interfacing the parallel outputs to another digital component. The 28-SSOP footprint requires adequate routing space for eight channels and the associated digital signals.
This product page combines manufacturer specifications, sourcing guidance, verified drop-in alternatives, and practical PCB considerations. The comparison and design guidance help engineers determine whether the MAX118EAI+ fits a specific acquisition architecture, interface voltage requirement, channel count, and standby-power budget.
直接替換替代品，適用於 MAX118EAI+ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MAX118EAI+ （相同外形與佔位） — 差異在於 Conversion Time, Package, Power-Down Current, Power-Down Recovery Time, Resolution.
MAX118EAI+T
✅ 直接替換📋 參考替代品（不在目錄中）
MAX118CAI+
✅ 直接替換聯絡詢價
查看資料表 →MAX118EAI
✅ 直接替換📋 參考替代品（不在目錄中）
MAX118EAI+ 最大額定值與電氣特性
| ADC Type | Flash ADC |
| 解析度 | 8 bit |
| Number of Input Channels | 8 channels |
| Input Type | Single-ended |
| Conversion Rate | 1Msps |
| Conversion Time | 660ns |
| 供應電壓 | +5V |
| Power-Down Current | Typically 1µA |
| Power-Down Recovery Time | Less than 200ns |
| 介面 | Parallel |
| Reference Type | External |
| Architecture | Half-flash |
| 封裝 | 28-SSOP |
| Number of Terminals | 28 |
| Terminal Form | Gull wing |
| Temperature Grade | Industrial |
| Package Shape | Rectangular |
MAX118EAI+ rectangular 腳位配置指南
MAX118EAI+（rectangular 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： MAX118EAI+.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX118EAI+ 適用於 6 應用s: Industrial Multichannel Sensor Acquisition, Microcontroller Data Acquisition, Low-Power Intermittent Measurement, Process Control and Automation, Laboratory and Instrumentation, Position and Feedback Measurement.
Industrial Multichannel Sensor Acquisition
The MAX118EAI+ fits industrial monitoring boards that must scan eight analog sensor channels at up to 1Msps. Its eight single-ended inputs eliminate the need for eight separate converter packages, while the 660ns half-flash conversion time provides a practical basis for high-speed sampling. Place each sensor path close to the converter, maintain a continuous return plane, and decouple the +5V supply near the device. The parallel interface requires enough board area for eight data lines and careful separation between switching digital outputs and low-level analog inputs.
推薦
Microcontroller Data Acquisition
MAX118EAI+ is appropriate when a microcontroller needs fast acquisition through a parallel bus rather than a serial ADC. The 8-bit resolution supports coarse measurements such as position, potentiometer angle, and discrete analog thresholds, while the 1Msps throughput can capture rapidly changing waveforms. The processor or FPGA must be able to capture the parallel output without timing conflicts. Confirm logic-level compatibility, add isolation or level translation when necessary, and route the eight data outputs away from sensitive input traces to reduce conversion-edge coupling.
推薦
Low-Power Intermittent Measurement
The MAX118EAI+ supports battery-operated or intermittently powered measurement systems because its active-low power-down mode typically reduces current to 1µA and recovery takes less than 200ns. A controller can keep the converter disabled between measurement bursts, enable it, capture one or more conversions, and return it to power-down without a long startup delay. The external reference and input circuitry must also be controlled for accurate low-power readings, especially if leakage or reference shutdown introduces additional error during the measurement interval.
推薦
Process Control and Automation
The MAX118EAI+ can monitor several process variables in an automation controller, including pressure, temperature, flow-sensor outputs, and resistive sensor bridges conditioned into the 0-to-5V input range. Eight channels permit periodic updates from multiple sensing points while the half-flash converter reaches a 1Msps sampling rate. For closed-loop control, evaluate the total acquisition latency, input settling time, reference accuracy, and digital bus access. Keep analog conditioning close to the ADC and use a solid ground reference to obtain repeatable conversion results.
推薦
Laboratory and Instrumentation
MAX118EAI+ is useful in compact laboratory instruments that sample several analog channels and require a straightforward parallel readout. Its eight-bit resolution is suitable for basic meter, waveform, and calibration functions where high precision is not essential. The +5V analog supply and external reference allow reference selection to match the measurement range, while the 28-SSOP package supports conventional surface-mount assembly. For bench accuracy, evaluate offset, gain, and reference stability according to the manufacturer’s test conditions before treating an 8-bit code as a precision measurement.
推薦
Position and Feedback Measurement
The MAX118EAI+ can acquire output from potentiometers, angular position sensors, and other analog feedback elements when an 8-bit measurement is sufficient. Eight channels allow several axes or redundant feedback signals to be sampled with one converter, reducing component count and simplifying synchronization. The 1Msps throughput provides ample margin for many position-control loops, although the complete signal path determines practical accuracy. Verify input range, settling behavior, connector protection, and the update time required by the motion-control loop.
推薦
工程參考資料，適用於 MAX118EAI+ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MAX118EAI+T | MAX118CAI+ | MAX118EAI |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit |
| Input Channels | 8 channels | 8 channels | 8 channels | 8 channels |
| Conversion Rate | 1Msps | 1Msps | 1Msps | 1Msps |
| Supply Voltage | +5V | +5V | +5V | +5V |
| Interface | Parallel | Parallel | Parallel | Parallel |
| Architecture | Half-flash | Half-flash | Half-flash | Half-flash |
| Reference Type | External | External | External | External |
| Power-Down Current | Typically 1µA | Typically 1µA | Typically 1µA | Typically 1µA |
主要差異化特點
- Eight input channels in one converter (對比MAX1112EAP+)
- Direct parallel readout (對比MAX1112EAP+)
- Fast half-flash conversion (對比MAX1112EAP+)
設計說明
Route the eight analog inputs as short, quiet traces over a continuous ground plane, and place the input-conditioning components close to the MAX118EAI+ rather than near the signal source. A long unprotected input path increases susceptibility to crosstalk and pickup. Keep the parallel data outputs on the opposite side of the package where practical, and avoid routing them beneath analog inputs or the external reference connection.
Use a low-impedance external reference and decouple the +5V supply near the device. Reference noise appears directly in the conversion result, while supply disturbance can affect the ADC’s internal reference and comparator behavior. Verify the reference voltage and input range against the manufacturer’s electrical characteristics, and ensure that the source impedance and sample-and-hold settling time are compatible with the 660ns conversion interval.
Do not treat the 8-bit resolution as 256 exact physical levels unless the analog front end and reference are designed appropriately. Offset, gain error, input noise, reference drift, and source impedance can consume several codes. Use the manufacturer’s timing and accuracy information to establish the usable measurement range, and validate each analog channel rather than calibrating only one representative input.
Because the 28-SSOP device exposes a parallel interface, plan the PCB layer flow so the eight data lines reach the processor or FPGA without unnecessary stubs. Maintain a continuous return path beneath signal routes, use appropriate input protection and source impedance, and keep the power-down and conversion-control traces away from high-current switching nodes. Confirm pin orientation against the manufacturer package drawing before releasing artwork.
合規資訊
The product is an industrial-temperature analog-to-digital converter. Specific RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations should be confirmed from the current manufacturer documentation or declaration for the exact order code.