MAX117CAI+ - 8-Channel 8-Bit 400ksps ADC | Maxim
부품 번호: MAX117CAI+ ✓ 활성MAX117CAI+ 개요
A flash ADC is a sampling data-conversion IC that compares its analog input against an internal reference ladder and directly produces a digital output. The MAX117 belongs to the ADC category within data-converter ICs and broader semiconductor hierarchy. Its parallel architecture allows a microprocessor or digital controller to read each conversion result directly, making it useful for multichannel industrial monitoring, control, instrumentation, and embedded systems where several relatively slow sensor signals must be digitized.
The MAX117CAI+ converts at 400 ksps and uses a half-flash technique to achieve a 1.8 µs conversion time. Its PWRDN input reduces supply current to 1 µA typical for low-duty-cycle or portable equipment. A logic high on PWRDN wakes the converter to normal operation in less than 900 ns. The input and reference arrangement supports ratiometric operation, in which the converter follows the ratio between the measured input and its reference voltage.
Eight single-ended inputs provide the device with a practical advantage over single-channel ADCs in multichannel systems. Parallel output reduces the number of serial-clock cycles required after conversion, although it requires more connection paths between the ADC and the controller. The 28-pin SSOP package is suitable for through-hole assembly and is substantially larger than modern leadless packages, making board area an important design consideration.
Typical applications include temperature and pressure monitoring, industrial process control, battery-cell measurement, discrete sensor acquisition, laboratory instrumentation, and embedded control systems. For designs requiring higher resolution, more channels, or a more compact package, the MAX113/MAX117 family should be checked for the appropriate channel count and package variant.
Design around the specified +3 V supply, external reference behavior, conversion timing, and parallel data interface. Decoupling should be placed close to the supply and reference pins, while unused inputs and control pins should be connected according to the manufacturer pin-description table. Input signals must remain within the device's specified analog input range.
This product page consolidates the converter's core specifications, package information, application guidance, design considerations, and the documented drop-in option into an engineering-focused reference. It also distinguishes the MAX117CAI+ from the closely related MAX117CAI+T ordering code so procurement teams can identify the correct manufacturer suffix.
드롭인 대체품: MAX117CAI+ — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
MAX117CAI+T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX117CAI+ 최대 정격 & 전기적 특성
| ADC Type | Flash ADC |
| 분해능 | 8 bit |
| Number of Input Channels | 8 channels |
| Input Configuration | 8 single-ended inputs |
| Conversion Rate | 400 ksps |
| Conversion Time | 1.8 µs |
| 공급 전압 | +3 V |
| Shutdown Supply Current | 1 µA typical |
| Wake-Up Time | Less than 900 ns |
| Output Interface | Parallel |
| Controller Compatibility | Microprocessor-compatible |
| Reference Operation | Ratiometric operation |
| 패키지 | 28-pin SSOP |
| 실장 유형 | Surface Mount |
MAX117CAI+ 28-pin ssop 핀 구성 가이드
MAX117CAI+(28-pin ssop 패키지)의 핀 구성입니다. 이 아날로그 부품에는 입력, 출력, 전원 공급 핀이 있습니다. 오프셋 널, 보상, 인에이블 핀 구성은 제조사 데이터시트를 참조하십시오. 신호 컨디셔닝 및 증폭기 회로에 이상적입니다.
다음에 대한 상세 핀아웃 데이터 없음: MAX117CAI+.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
MAX117CAI+ 적합 용도: 6 애플리케이션s: Industrial Process Monitoring, Temperature and Pressure Acquisition, Battery-Powered Instrumentation, Embedded Control Systems, Laboratory and Test Equipment, Battery Cell Monitoring.
Industrial Process Monitoring
The MAX117CAI+ suits industrial monitoring boards that acquire several slow sensor signals, such as pressure, level, temperature, or actuator-position feedback. Its eight single-ended inputs reduce the number of separate converter packages required, while the 8-bit resolution can support threshold control and basic process supervision. At up to 400 ksps, the converter can complete a full eight-channel scan in 20 µs when conversions are performed consecutively. The parallel output is convenient for a microcontroller or programmable logic controller because each result can be captured through dedicated data lines. Design the analog front end to keep sensor voltages within the MAX117CAI+ input range and use ratiometric operation when the sensor and reference can share a stable excitation source.
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Temperature and Pressure Acquisition
The MAX117CAI+ can digitize several resistive or ratiometric sensor outputs in a compact data-acquisition module. Eight single-ended inputs allow the board to combine multiple temperature, pressure, or position channels, while the 1.8 µs conversion time provides ample timing margin for periodic measurement. Ratiometric operation is especially useful when the sensor resistance and analog reference respond to the same excitation, because the digital result then depends more directly on resistance ratio than on absolute excitation voltage. Use the converter's 8-bit output for coarse indication, setpoint control, or alarm thresholds where finer resolution is unnecessary. Verify sensor excitation levels, source impedance, reference stability, and input settling time against the manufacturer electrical characteristics.
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Battery-Powered Instrumentation
The MAX117CAI+ fits intermittently operated, battery-powered instruments that must conserve power between measurements. Its PWRDN input reduces supply current to 1 µA typical, and the manufacturer MAX113/MAX117 datasheet states that normal operation resumes in less than 900 ns after PWRDN is driven high. A measurement sequence can therefore sample eight analog channels at the required intervals rather than keeping the converter continuously active. This is particularly useful for portable environmental monitors and field-service instruments whose duty cycle is low. Account for wake-up time in the controller timing sequence, and ensure the reference and analog circuitry return to their intended states before the first conversion. The 8-bit resolution should be matched to the measurement requirement rather than used to imply precision beyond the sensor chain.
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Embedded Control Systems
The MAX117CAI+ provides a straightforward parallel-input ADC for an embedded controller requiring multiple low-speed analog measurements. A microcontroller can initiate conversions, read the 8-bit result over a parallel bus, and move to the next channel without a serial ADC clock. The 400 ksps conversion rate supports rapid scanning, although the practical scan rate will also depend on bus timing, input settling, and controller access. The device is useful for control panels, appliance controllers, and embedded instrumentation where control logic needs discrete measurements rather than a continuous high-resolution waveform. Use a common ground reference between the converter and analog sensors, place supply bypass capacitors near the package pins, and verify that every unused input is configured as required by the manufacturer pin-description table.
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Laboratory and Test Equipment
The MAX117CAI+ can serve as a multichannel front end in compact laboratory instruments, bench controllers, and educational measurement systems. Eight single-ended inputs make it possible to monitor several potentiometers, dividers, transducers, or status voltages without using a separate converter for each channel. Its parallel output supports direct connection to digital control logic, and the 400 ksps rate supports faster sampling than is typically required for slow panel meters or setpoint measurements. The half-flash architecture reaches conversion in 1.8 µs, but system accuracy still depends on reference quality, analog input conditioning, leakage, and PCB layout. Use a stable reference, maintain consistent grounding, and calibrate the completed measurement chain. The 28-pin SSOP footprint is easy to inspect and rework but requires considerably more board area than a leadless ADC.
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Battery Cell Monitoring
The MAX117CAI+ can support coarse multi-cell or multi-node voltage acquisition in battery-management equipment when the required measurement resolution is limited to 8 bits. Eight single-ended channels allow several divided cell voltages to be captured sequentially, while ratiometric reference behavior can support systems in which the reference tracks the monitored source. The 1.8 µs conversion time is short compared with the spacing normally required between battery measurements, and the 400 ksps rate supports rapid sampling during controlled test sequences. However, battery-management designs often demand accuracy, input range, and diagnostics beyond those of a general-purpose 8-bit ADC. Confirm that the divided cell voltages remain within the allowed input range, isolate sensitive measurement paths, and validate safety margins independently before using the converter in a protection-critical circuit.
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추천 제품 요약
엔지니어링 참조 데이터: MAX117CAI+ — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX117CAI+T |
|---|---|---|
| Package | 28-pin SSOP | 28-pin SSOP - same package |
| Brand | Analog Devices | Analog Devices |
| ADC Type | Flash ADC | Flash ADC |
| Resolution | 8 bit | 8 bit |
| Number of Input Channels | 8 channels | 8 channels |
| Input Configuration | 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 Supply Current | 1 µA typical | 1 µA typical |
| Output Interface | Parallel | Parallel |
주요 차별점
- Direct package-compatible ordering-code alternative (vs MAX117CAI+T)
- Eight-channel integration reduces converter count (vs MAX113)
- Very low standby demand for intermittent acquisition (vs MAX117CAI+T)
설계 노트
Place the supply bypass capacitor close to the MAX117CAI+ power and ground pins, and keep the analog and digital return paths connected to the same system ground unless the completed design uses a deliberate isolation strategy. Enable the PWRDN function only when the analog inputs and reference can tolerate the powered-down state. Account for the less-than-900 ns wake-up interval before requesting the first conversion. Reference stability directly affects conversion accuracy, so avoid routing the reference node through long traces or near high-current switching paths.
Use the manufacturer package drawing to reproduce the 28-pin SSOP land pattern, pin-1 orientation, and lead pitch exactly. Route the eight analog inputs away from digital output and control nets, and keep parallel output traces away from sensitive input traces to reduce capacitive crosstalk. Where the board includes both analog and digital sections, use a clear ground reference, minimize loop area in reference distribution, and provide adequate spacing around the analog pins according to the recommended layout in the MAX113/MAX117 datasheet.
Do not treat the 1.8 µs conversion time as the complete acquisition-system acquisition time. The source impedance, input capacitance, reference condition, sample-and-hold settling behavior, and controller bus cycle can determine the practical interval between valid samples. Also avoid assuming that an 8-bit result provides the accuracy of an 8-bit measurement; sensor error, reference error, resistor tolerance, noise, and layout can each reduce end-to-end precision. Validate these effects with the selected analog front end.
규정 준수 정보
No specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals statement was identified for the MAX117CAI+ ordering code. AEC-Q100 is not applicable to this commercial general-purpose data-conversion IC.