MAX120ENG+ - 12-Bit 500ksps SAR ADC | Maxim Integrated
MPN： MAX120ENG+ ✓ 啟用中MAX120ENG+ 概覽
An ADC is an analog-to-digital converter, a semiconductor that samples a continuous analog voltage and converts it into a numeric code for processing or storage. Within the data-converter hierarchy, the MAX120ENG+ is a single-channel SAR ADC. Successive approximation compares the sampled input against an internal trial DAC and internal reference until the conversion reaches its specified resolution. This architecture provides predictable sampling behavior for control and measurement systems without the complexity of a continuously operating high-speed converter.
The MAX120ENG+ converts single-ended analog input signals into 12-bit digital words. Its 500 ksps maximum conversion rate provides 2 microseconds per conversion before acquisition overhead. The 24-pin PDIP package is intended for through-hole PCB assembly and offers generous spacing between pins for hand soldering, prototyping, inspection, and applications using standard perforated-board construction.
The MAX120E family combines a 12-bit SAR conversion core with parallel digital output and integrated reference circuitry. Parallel data access avoids the serial-interface overhead associated with many mixed-signal converters. A parallel bus can also simplify connections to older processors, FPGA interfaces, latch arrays, or dedicated data-capture logic, provided the timing of acquisition, conversion, and data transfer is coordinated correctly.
Typical uses include industrial process monitoring, laboratory measurement equipment, sensor signal acquisition, embedded control systems, waveform sampling, and closed-loop control. The single-channel architecture is particularly appropriate when one analog quantity must be sampled with high conversion throughput. Multiplexed systems can also use the converter when switching the analog source externally, although the multiplexer settling time must be allowed before each acquisition.
PCB design should keep the analog input path short and isolate it from digital output and clock activity. Place input filtering and reference-decoupling components near the relevant device pins, provide a stable ground reference, and route high-current outputs away from the analog input. Because the converter uses a parallel interface, confirm signal direction, acquisition timing, and bus contention against the manufacturer pin-description table before finalizing the schematic.
This product page combines the verified device specifications, package details, sourcing guidance, equivalent-part analysis, and practical PCB guidance into one engineering-focused reference. It also distinguishes true PDIP-24 alternatives from parts that may be functionally similar but do not establish the same board-level replacement requirement.
直接替換替代品，適用於 MAX120ENG+ — 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： MAX120ENG+ （相同外形與佔位） — 差異在於 Input Type, Track and Hold.
MAX120CNG+
✅ 直接替換聯絡詢價
查看資料表 →MAX122BENG+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1271BENG+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX172AENG+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX120ENG+ 最大額定值與電氣特性
| ADC Type | Successive-approximation ADC |
| 解析度 | 12 bit |
| Number of Input Channels | 1 channel |
| Input Type | Single-ended |
| Maximum Sampling Rate | 500 ksps |
| Conversion Time at Maximum Rate | 2 us |
| Data Output Type | Parallel word access |
| Digital Output Width | 12 bit |
| Process Technology | BiCMOS |
| Reference Type | Internal |
| Track and Hold | Track-and-hold input |
| 封裝 | 24-pin PDIP |
| 腳位數 | 24 pins |
| 安裝方式 | Through-hole |
| Temperature Grade | Industrial |
MAX120ENG+ 24-pin pdip 腳位配置指南
MAX120ENG+（24-pin pdip 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： MAX120ENG+.
請參閱 資料表 以查看完整腳位配置。
典型應用
MAX120ENG+ 適用於 6 應用s: Industrial Process Monitoring, Sensor Signal Acquisition, Laboratory Measurement Equipment, Embedded Control Systems, Waveform and Transient Sampling, Data Acquisition Modules.
Industrial Process Monitoring
The MAX120ENG+ is appropriate for acquiring a single industrial process variable when 12-bit resolution and a 500 ksps conversion rate provide sufficient speed. Place the converter behind an input-conditioning network that converts the sensor or transmitter output into a voltage within the ADC input range. The 2 microsecond conversion interval at 500 ksps allows rapid sampling, while the parallel output can feed a processor, FPGA interface, or capture register. Because the device has one single-ended input, external multiplexing can expand channel count, but each selected source must settle for the acquisition time specified by the manufacturer.
推薦
Sensor Signal Acquisition
The MAX120ENG+ suits sensors that require more frequent conversion than a slow general-purpose ADC but do not demand resolution beyond 12 bits. Its single-ended input, internal reference, and track-and-hold function form the core of a straightforward acquisition channel. Place the transducer interface, anti-alias filter, and input conditioning close to the converter to limit noise pickup. The 500 ksps maximum rate produces one 12-bit sample every 2 microseconds under ideal conversion timing, while the parallel bus provides direct access to the acquisition and processing logic.
推薦
Laboratory Measurement Equipment
The MAX120ENG+ can serve as the acquisition converter in laboratory instruments that measure one analog channel and require deterministic parallel data transfer. Its 12-bit resolution provides 4096 code levels, while the 500 ksps rate supports waveform and event sampling beyond the needs of many slowly changing measurements. The internal reference reduces the number of external reference components, although precision analog measurements still require careful grounding, input buffering, and filtering. The 24-pin PDIP package is particularly convenient for instrument prototypes built on perforated board.
推薦
Embedded Control Systems
The MAX120ENG+ fits embedded controllers that need periodic feedback from an analog sensor and can accommodate a parallel interface. Its 500 ksps capability is more than adequate for many motor, thermal, pressure, and position control loops, while 12-bit resolution supports moderate control precision. The through-hole PDIP-24 package simplifies prototype assembly and rework. Interface the parallel outputs through appropriately buffered logic when the converter is not located next to the controller, and account for output timing so that the processor reads stable data after conversion.
推薦
Waveform and Transient Sampling
The MAX120ENG+ is suitable for repetitive waveform sampling when each sample must be represented by 12 bits and converted at up to 500 ksps. A sample period of 2 microseconds gives a theoretical maximum signal bandwidth of 250 kHz before allowing for acquisition and transfer overhead, so the usable bandwidth will be lower in a practical system. The track-and-hold input and parallel output help preserve a direct sampling path. Use an anti-alias filter, stable triggering, and memory logic that captures each output word without contending with the next conversion.
推薦
Data Acquisition Modules
The MAX120ENG+ supports compact single-channel data-acquisition modules that expose a 12-bit sample stream to a host processor. Its parallel output can connect to a latch, FPGA, or microcontroller input bank, while the internal reference and track-and-hold function simplify the front end. The PDIP-24 format supports through-hole assembly, making it practical for educational, industrial monitoring, and legacy control modules. For multi-channel instruments, place a suitable multiplexer ahead of the input and honor the converter's acquisition interval during source switching.
推薦
推薦產品摘要
工程參考資料，適用於 MAX120ENG+ — 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 | MAX120CNG+ | MAX122BENG+ | MAX1271BENG+ | MAX172AENG+ |
|---|---|---|---|---|---|
| Package | PDIP-24 | PDIP-24 | PDIP-24 | PDIP-24 | PDIP-24 |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Mounting Style | Through-hole | Through-hole | Through-hole | Through-hole | Through-hole |
主要差異化特點
- Direct 24-pin PDIP board compatibility (對比MAX120CNG+)
- Higher sampling capability than the generic comparator context (對比MAX122BENG+)
- Single-channel simplified acquisition architecture (對比MAX1271BENG+)
- Parallel output simplifies direct acquisition interfaces (對比MAX172AENG+)
設計說明
Route the single-ended analog input directly to the MAX120ENG+ and keep the path short and away from the 12 parallel output lines. Place the source impedance, anti-alias filter, and any input buffer close to the converter. A long input trace can behave as an antenna and allow switching-node energy to appear directly in the conversion result.
Do not treat the stated 500 ksps rate as a guaranteed complete sample rate without accounting for acquisition, conversion, and output-transfer intervals. The 2 microfigure conversion interval does not include every system overhead. If an external multiplexer is used, allow its settling time before the track-and-hold acquisition begins and verify the resulting total sampling period against the application timing.
Use the manufacturer application circuit as the basis for input, reference, and bypass-capacitor placement. Connect decoupling components close to their associated pins with short ground returns. Maintain a continuous analog-ground path beneath or near the converter and separate noisy digital return currents from the input reference to reduce conversion error and digital coupling.
The parallel output bus can expose timing skew, ringing, or contention if routed incorrectly. Keep output traces short where possible, match signal lengths when the receiving device has a narrow setup window, and avoid connecting two devices to the same output bus simultaneously. Confirm acquisition, conversion-complete, and data-valid timing against the manufacturer datasheet before setting processor read-control sequencing.
Design the analog and digital supply paths so converter switching currents do not share a narrow return segment with the input reference. Use local bypass capacitance and provide clean supply distribution at the device pins. The exact supply voltage, current, power dissipation, and allowable ripple must be established from the manufacturer electrical-characteristics table before final rail selection.
合規資訊
The target-specific compliance status is not stated in the manufacturer product information. RoHS status shown for MAX1271BENG+ in comparison material is not transferred to the MAX120ENG+. This industrial ADC is not identified as an AEC-Q100-qualified automotive device.