MAX117CPI - 8-Channel 8-Bit 400ksps ADC | Analog Devices
部品番号: MAX117CPI ✓ 生産中MAX117CPI 概要
An ADC is a data-conversion IC that translates an analog input voltage into a digital code for processing, measurement, or control. The MAX117 belongs to the ADC hierarchy, where flash ADCs use parallel or semi-parallel internal comparison stages to support relatively high sampling rates. Its eight inputs make it useful when a system must monitor several analog signals through one converter rather than using a separate ADC for each channel.
Key characteristics include 8-bit resolution, eight analog inputs, a maximum sampling rate of 400 ksps, and a conversion time of 1.8 microseconds. The MAX117CPI uses a +3 V supply, provides microprocessor-compatible interfacing, and includes a power-down function. These features suit compact control and measurement systems where low supply voltage, multiple inputs, and straightforward digital interfacing are more important than high-resolution conversion.
The half-flash architecture provides a practical balance between conversion speed and implementation complexity. At 400 ksps, one conversion can nominally occupy 1.8 microseconds before software or hardware overhead is added. An 8-bit converter represents each analog input with one byte of digital data, which is appropriate for threshold monitoring, switch-position decoding, simple sensor measurement, and supervisory control functions where additional resolution would not materially improve the system result.
Typical uses include industrial control panels, battery-operated instruments, digital thermometers, multichannel sensor interfaces, automotive accessory modules, and embedded monitoring systems. The eight inputs can support several resistive sensors, discrete thresholds, or mixed analog signals sharing a common measurement front end. The MAX117 is especially relevant where the host processor requires a simple parallel ADC interface rather than a serial data-conversion protocol.
Designers should confirm signal-range compatibility, supply sequencing, acquisition timing, and input-signal settling before committing the eight analog channels to a board. Input conditioning may be required when sources exceed the converter's input range or drive the inputs too slowly for the selected sampling rate. Digital interface timing and reference behavior must also be checked against the manufacturer's pin-description table.
This product page consolidates the converter's principal electrical characteristics, verified package information, drop-in family options, and application-oriented design guidance. It is intended to shorten component selection while keeping the final circuit decisions with the engineer and the manufacturer datasheet.
ドロップイン代替品: MAX117CPI — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
MAX113CPI
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MAX113CPI+
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MAX113EPI
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MAX113EPI+
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MAX117CPI+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX117CPI 最大定格＆電気的特性
| Converter Type | Flash analog-to-digital converter |
| 分解能 | 8 bit |
| Number of Analog Inputs | 8 inputs |
| サンプリングレート | 400 ksps |
| Conversion Time | 1.8 us |
| 電源電圧 | +3 V |
| インターフェースタイプ | Microprocessor-compatible parallel interface |
| Conversion Method | Half-flash |
| Power-Down Function | Supported |
| Package Type | 28-pin through-hole DIP |
| Package Code | PDIP-28 |
| Terminal Count | 28 terminals |
| Package Shape | Rectangular |
| 実装タイプ | Through-hole |
| Temperature Grade | Commercial |
| Moisture Sensitivity Level | MSL 1 (unlimited floor life) |
MAX117CPI rectangular ピン配置ガイド
MAX117CPI (rectangular パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: MAX117CPI.
詳細は データシート をご参照ください。
主な用途
MAX117CPI の用途: 6 件s: Industrial Multichannel Sensor Monitoring, Battery-Powered Portable Instrumentation, Automotive Accessory Monitoring, Digital Thermometer and Resistance Measurement, Switch Position and Threshold Decoding, Embedded Control and Data Acquisition.
Industrial Multichannel Sensor Monitoring
The MAX117CPI is suitable for industrial monitoring systems that must scan several analog sensor outputs with one parallel ADC. Its eight inputs reduce the number of separate converter packages when compared with single- or dual-channel alternatives, while 8-bit resolution is appropriate for supervisory and threshold measurements. The 400 ksps conversion rate allows the host processor to complete eight sequential conversions in substantially less than the time needed for many slower monitoring systems. Each source must remain within the specified analog input range and settle before sampling, so resistive sensors may require input buffers or suitable acquisition timing. The single +3 V supply also helps align the converter with compact embedded controller boards.
おすすめ
Battery-Powered Portable Instrumentation
The MAX117CPI can serve as the measurement front end in portable instruments operating from a +3 V rail. Eight analog inputs permit multiplexing among resistive sensors, position indicators, or analog control signals without requiring eight separate converter ICs. The half-flash architecture reaches 1.8 microseconds per conversion, supporting 400 ksps sampling when rapid scanning is needed. For battery-focused designs, the available power-down function can reduce activity between measurement bursts, although system timing must account for device wake-up behavior. Input buffering, passive filtering, and reference stability remain important because battery impedance and sensor settling can affect the accuracy of an 8-bit measurement.
おすすめ
Automotive Accessory Monitoring
The MAX117CPI is functionally suitable for monitoring multiple low-speed analog signals in automotive accessory or body-control modules where eight channels, 8-bit resolution, and a +3 V supply align with the measurement task. A host microcontroller can select each input through the converter's microprocessor-compatible interface and acquire a result at up to 400 ksps. Vehicle environments require careful attention to transient protection, ground quality, reference accuracy, and qualification documentation for the exact device. Because automotive-grade qualification for the MAX117CPI has not been established by the available product information, an AEC-Q100-qualified device should be selected when that requirement applies to the finished module.
おすすめ
Digital Thermometer and Resistance Measurement
The MAX117CPI can support multi-sensor thermometry when resistive probes or conditioned analog temperature signals are connected to several inputs. Eight channels allow one converter to scan multiple temperature zones, while an 8-bit result is generally appropriate for coarse thermal indication, thermal switching, and fan-control thresholds. The 400 ksps rate is substantially faster than required for slow temperature changes and leaves ample acquisition margin for multiplexing. The circuit should include suitable probe excitation, input conditioning, and protection, while software must compensate for probe resistance and reference variation when greater accuracy is required.
おすすめ
Switch Position and Threshold Decoding
The MAX117CPI is well suited to switch-position decoding and discrete threshold monitoring because it combines eight analog inputs with a microprocessor-compatible parallel interface. Each switch or sensor output can be evaluated as an 8-bit code, allowing firmware to identify operating states without multiple dedicated comparator channels. The 1.8 microsecond conversion time supports fast sequential scanning, while the 8-bit resolution provides 256 digital codes across the converter's specified input span. Design work should include hysteresis or debouncing for mechanical switches, input conditioning for contact bounce, and validation of logic thresholds against the converter's transfer characteristics.
おすすめ
Embedded Control and Data Acquisition
The MAX117CPI fits embedded control boards that periodically acquire several analog variables and present the results to a microprocessor or microcontroller. Its parallel interface reduces firmware complexity compared with a serial ADC, while the single +3 V supply simplifies integration with common embedded platforms. Eight inputs can represent mixed quantities such as supply voltage, temperature proxies, position signals, and discrete analog states. At 400 ksps, the converter has ample conversion bandwidth for supervisory sampling, but designers must allocate acquisition, conversion, and data-read intervals separately. Reference accuracy, source impedance, and analog filtering directly influence the usefulness of the resulting 8-bit codes.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MAX117CPI — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MAX113CPI | MAX113CPI+ | MAX113EPI | MAX113EPI+ | MAX117CPI+ |
|---|---|---|---|---|---|---|
| Package | PDIP-28 | PDIP-28 | PDIP-28 | PDIP-28 | PDIP-28 | PDIP-28 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Analog Input Count | 8 inputs | 4 inputs, 50% fewer than MAX117CPI | 4 inputs, 50% fewer than MAX117CPI | 4 inputs, 50% fewer than MAX117CPI | 4 inputs, 50% fewer than MAX117CPI | 8 inputs |
| Sampling Rate | 400 ksps | 400 ksps | 400 ksps | 400 ksps | 400 ksps | 400 ksps |
| Conversion Time | 1.8 us | 1.8 us | 1.8 us | 1.8 us | 1.8 us | 1.8 us |
| Supply Voltage | +3 V | +3 V | +3 V | +3 V | +3 V | +3 V |
| Interface | Microprocessor-compatible parallel interface | Microprocessor-compatible parallel interface | Microprocessor-compatible parallel interface | Microprocessor-compatible parallel interface | Microprocessor-compatible parallel interface | Microprocessor-compatible parallel interface |
| Power-Down Function | Supported | Supported | Supported | Supported | Supported | Supported |
主な差別化要因
- Twice the input-channel count of the MAX113 family alternatives （vs MAX113CPI)
- Maintains the complete primary conversion specification in the listed ordering variant （vs MAX117CPI+)
- Higher channel density without changing the core family interface （vs MAX113EPI)
設計ノート
Do not treat the 400 ksps figure as the complete system acquisition rate. Each conversion occupies 1.8 microseconds, after which the host must perform channel selection, input settling, control signaling, and data retrieval. A multiplexer and source with high output impedance can require a longer acquisition interval than the converter's conversion time. Validate the complete timing chain with the worst-case source resistance, sensor bandwidth, and host-bus cycle.
Keep the eight analog input tracks away from the parallel digital output and control lines to reduce switching-noise pickup. Route each input according to the source impedance: high-impedance sensors benefit from short traces, guarding, and an input buffer, while low-impedance sources require less protection. Place analog grounding and decoupling in accordance with the manufacturer's reference layout and pin-description table. Because the package is a through-hole DIP, pay particular attention to through-hole lead spacing and the orientation of pin 1.
Design the +3 V rail so it remains stable while the eight input channels are scanned and the digital bus changes direction. Provide local bypass capacitance close to the supply and ground pins, and keep switching-regulator or digital-supply routing away from sensitive analog inputs. Use the power-down function during idle periods, but confirm wake-up timing before relying on it for rapid, periodic measurements. Reference stability and grounding should be evaluated together because they directly affect the 8-bit conversion result.
コンプライアンス情報
The product information identifies a commercial-grade MAX117CPI but does not provide RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification declarations for the exact MPN.
