MAX170DEPA - 12-Bit Serial SAR ADC, 8-PDIP | Maxim Integrated
料号： MAX170DEPA ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $56.66 | $56.66 |
| 10 | $53.4 | $534.00 |
| 100 | $49.2 | $4,920.00 |
| 500 | $45.1 | $22,550.00 |
| 1,000 | $41.85 | $41,850.00 |
MAX170DEPA 概述
A successive-approximation register (SAR) ADC is a type of analog-to-digital converter that uses a binary search algorithm across an internal capacitive DAC to converge on the input voltage, one bit per clock cycle. SAR converters are favored for applications requiring low latency, deterministic acquisition, and no pipeline delay. Within the converter hierarchy, SAR ADCs sit alongside sigma-delta and pipeline ADCs; they are generally preferred when sample rates of 10 kS/s to a few MS/s are needed and where a compact serial interface reduces board complexity. The MAX170 family uses a high-speed DAC plus comparator core, paired with an on-chip reference, to deliver a complete data-acquisition front end in a single 8-pin IC.
Key features include 12-bit resolution with ±0.5 LSB linearity (typical), an internal 5.0 V reference, single-ended analog input, an SPI/QSPI/MICROWIRE-compatible serial interface, and a chip-select input for bus sharing. The 8-pin PDIP package simplifies prototyping on through-hole boards and in legacy industrial systems where SMD footprints are not desired. Power consumption is approximately 4 mW during continuous conversion at full sample rate, dropping to microamp-levels in shutdown.
Typical applications include industrial process control, portable data loggers, robotics position sensing, isolated sensor signal chains, and front-end digitizing for 4-20 mA loops. The wide industrial operating range and integrated reference simplify BOM count and calibration routines in field-deployed equipment. Designers should observe the input clamp and reference bypass capacitor guidelines in the datasheet, plus adequate analog/digital ground separation on the PCB, to achieve rated 12-bit accuracy without missing codes.
This page synthesizes distributor pricing, datasheet pinout, and pin-compatible drop-in alternatives from the MAX170 family to help engineers evaluate the MAX170DEPA against modern SAR ADC replacements.
直接替换替代料： MAX170DEPA ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX170DEPA （相同外形与封装尺寸） ——差异在于 Conversion Time, Package, RoHS Status, Sampling Rate, Input Type.
快速对比工具——选择替代料号进行并排对比：
MAX170CCPA
✅ 直接替换✓ 有现货
$3.95 / 个
查看数据手册 →MAX170DCPA
✅ 直接替换📋 参考替代料（不在目录中）
MAX176ACPA
✅ 直接替换✓ 有现货
$17.2 / 个
查看数据手册 →MAX144ACPA
✅ 直接替换📋 参考替代料（不在目录中）
MAX170DEPA 最大额定值与电气特性
| Number of Bits | 12 |
| 采样率 | 125 kS/s |
| Conversion Time | 5.6 µs |
| Number of Inputs | 1 |
| Input Type | Single-Ended |
| Data Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Architecture | SAR (Successive Approximation) |
| Reference Type | Internal |
| S/H:ADC Ratio | 1:1 |
| Configuration | S/H-ADC |
| Number of A/D Converters | 1 |
| 电源电压 | +5 V (typical) |
| 工作温度 | -40 °C to +85 °C |
| Temperature Grade | Industrial |
| 封装 | 8-PDIP (through-hole) |
| Terminal Form | Through-Hole |
| Number of Terminals | 8 |
| 安装类型 | Through-Hole |
| RoHS 状态 | Compliant |
MAX170DEPA 引脚配置
| 引脚 1 | VREF — Reference voltage output / bypass node (internal 5.0 V reference) |
| 引脚 2 | AIN — Analog input (single-ended) |
| 引脚 3 | GND — Analog and digital ground |
| 引脚 4 | DOUT — Serial data output (SPI MOSI from ADC) |
| 引脚 5 | CS — Chip select, active low |
| 引脚 6 | SCLK — Serial clock input |
| 引脚 7 | VDD — +5 V power supply |
| 引脚 8 | SHDN — Shutdown input, active low |
典型应用
MAX170DEPA 适用于 6 应用s: Industrial Process Control Sensor Digitizing, Portable Data Logger Acquisition Front End, Robotics Position and Force Sensing, Isolated Sensor Signal Acquisition, Test and Measurement Bench Instruments, Legacy Industrial Control Board Replacement.
Industrial Process Control Sensor Digitizing
The MAX170DEPA is well suited to industrial process control sensor digitizing, where its 12-bit resolution and 125 kS/s sampling rate capture 4-20 mA loop signals, thermocouple amplifier outputs, and bridge pressure transducers. The internal 5.0 V reference eliminates an external reference IC and reduces BOM cost for multichannel PLC front ends. Operating from -40 °C to +85 °C, the device is rated for factory-floor cabinets and outdoor instrumentation. Designers route the SPI output to an MCU or FPGA over short traces, with the CS pin enabling multi-channel multiplexed acquisition across multiple MAX170DEPA devices on a shared bus.
推荐
Portable Data Logger Acquisition Front End
Battery-powered portable data loggers benefit from the MAX170DEPA's 4 mW active power consumption and 5.6 µs conversion time, which lets the host MCU duty-cycle conversions to extend battery life. The single-ended analog input accepts voltage-output sensors directly, and the internal reference removes the need for a separate low-dropout reference regulator. The 8-pin PDIP package is favored for hand-soldered prototype loggers and field-serviceable designs. Pair the converter with a low-power MCU such as the MAX32620 and a microSD store to build a compact multi-channel logger.
推荐
Robotics Position and Force Sensing
Robotics feedback loops require deterministic, low-latency analog-to-digital conversion to digitize potentiometer wiper voltages, load-cell bridge outputs, and current-sense amplifier signals at servo rates. The MAX170DEPA's SAR architecture delivers conversions in 5.6 µs with no pipeline delay, making it ideal for synchronous current and position sampling inside real-time control loops. Its single-ended input range plus internal 5 V reference simplifies the analog signal chain. The 8-PDIP package suits through-hole prototyping on robotics controller boards where rework tolerance is valued over miniaturization.
推荐
Isolated Sensor Signal Acquisition
Isolated sensor modules for medical, energy, or industrial monitoring often digitize analog signals at the sensor and transmit them across a digital isolator. The MAX170DEPA's SPI-compatible serial interface is easily routed through digital isolators like the MAX12931 or ADuM1411, preserving 12-bit accuracy across the isolation barrier. The integrated reference ensures the ADC is the master timing element on the field side, simplifying firmware synchronization. The industrial temperature rating ensures operation in substations and outdoor enclosures.
推荐
Test and Measurement Bench Instruments
Bench-top multimeters, function generators, and laboratory data acquisition boards can leverage the MAX170DEPA as a precision 12-bit digitizer for analog inputs. Its 5.6 µs conversion time supports audio-bandwidth sampling and bench DMM measurement rates, while the internal reference minimizes calibration drift between units. The through-hole 8-PDIP package is convenient for hand-built prototypes and educational lab kits. Designers can daisy-chain multiple MAX170DEPA devices via their CS pin to expand channel count in PXI-style modular instruments.
推荐
Legacy Industrial Control Board Replacement
Many legacy industrial controllers, CNC machines, and SCADA systems use the MAX170DEPA in their original through-hole designs. When these boards are serviced decades after manufacture, the MAX170DEPA remains a drop-in compatible part on the same 8-pin PDIP footprint, preserving original schematics and BOMs. Its mature silicon and long-term availability through Maxim/Analog Devices franchised distributors support the multi-decade service life expected of industrial infrastructure. Designers should also consider the MAX170CCPA for spare-parts inventory when commercial temperature grades are acceptable.
推荐
推荐产品汇总
工程参考数据： MAX170DEPA ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX170CCPA | MAX170DCPA | MAX176ACPA | MAX144ACPA |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 8-PDIP | 8-PDIP - same | 8-PDIP - same | 8-PDIP - same | 8-PDIP - same |
| Resolution | 12-bit | 12-bit | 12-bit | 14-bit | 12-bit |
| Conversion Time | 5.6 µs | 5.6 µs | 5.6 µs | 250 µs | slower |
| Sampling Rate | 125 kS/s | 125 kS/s | 125 kS/s | lower | lower |
| Operating Temperature | -40 °C to +85 °C (industrial) | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) | 0 °C to +70 °C | 0 °C to +70 °C |
| Reference Type | Internal | Internal | Internal | Internal | Internal |
| Data Interface | SPI/QSPI/MICROWIRE serial | SPI/QSPI/MICROWIRE serial | SPI/QSPI/MICROWIRE serial | SPI serial | SPI serial |
关键差异点
- Industrial -40 °C to +85 °C operating range （对比 MAX170CCPA)
- Higher sampling rate than MAX176A （对比 MAX176ACPA)
- Single-supply +5 V operation with internal reference （对比 MAX144ACPA)
设计说明
The MAX170DEPA draws approximately 4 mW from a single +5 V supply during continuous conversion. Decouple VDD with a 10 µF tantalum and 0.1 µF ceramic capacitor placed within 5 mm of the VDD pin to suppress digital switching noise from corrupting the analog input. Driving SHDN high before VDD settles prevents the internal reference from sinking current through a partially-powered ADC core.
Separate analog and digital ground returns with a single-point star connection at the GND pin. Keep the analog input trace short and guarded by a ground pour to minimize capacitive coupling from the SCLK and DOUT lines. Place the 10 µF REF bypass capacitor directly at the VREF pin using a low-ESR ceramic or tantalum type to achieve the datasheet's 12-bit no-missing-code performance.
Source impedance at the AIN pin should be kept below 1 kΩ to maintain rated acquisition time; a higher source impedance requires a wider SCLK window or a front-end buffer such as the MAX4166. When daisy-chaining multiple MAX170DEPA devices via CS, ensure the SCLK signal is properly terminated at the farthest device to avoid ringing that could trigger double-clocking on the SAR register.
Estimated: at VIN = 5 V and 8 active SCLK cycles per conversion, each MAX170DEPA consumes roughly 0.8 mA average current. Do not omit the SHDN pin tie — leaving it floating can cause unpredictable start-up behavior. The 8-pin PDIP footprint differs from the 16-pin SO (DW suffix) variant, so PCB designers must verify the package code before laying out the board.
合规信息
RoHS compliant per Maxim Integrated product page. Not AEC-Q100 qualified - this part is intended for industrial/commercial, not automotive.
