MAX187CCWE - 12-Bit 75kSPS Serial ADC | Maxim Integrated
料号： MAX187CCWE ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $16.55 | $16.55 |
| 10 | $14.9 | $149.00 |
| 100 | $13.25 | $1,325.00 |
| 500 | $11.8 | $5,900.00 |
| 1,000 | $10.55 | $10,550.00 |
MAX187CCWE 概述
An SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm against an internal DAC to digitize an analog input one bit per clock cycle. SAR ADCs sit in the broader hierarchy of precision data converters -> ADCs -> successive-approximation ADCs -> integrated-circuit semiconductor. Compared with integrating or delta-sigma ADCs, SAR ADCs deliver the best combination of speed and accuracy for multiplexed or single-channel industrial sampling up to a few hundred kilosamples per second.
Key features of the MAX187CCWE include 75 kSPS sampling rate, internal 4.096V reference, 1.5 us acquisition time, 8.5 us conversion time, low 1.5 mA operating supply current, and hardware- or software-configurable shutdown reducing quiescent current to a few microamps. The internal reference eliminates an external reference IC in many designs, saving board area and BOM cost.
The MAX187CCWE uses a charge-redistribution SAR architecture with an internal capacitor DAC and a precision internal bandgap reference. Its high-speed serial interface is compatible with SPI, QSPI, and Microwire, allowing direct connection to most microcontrollers without glue logic. Internal calibration trims linearity, and the device maintains 12-bit performance across the commercial 0C to +70C temperature range.
Typical applications include portable data logging, process control, pen digitizers, portable instruments, isolated data acquisition, and remote-sensor signal conditioning. The wide operating supply range and serial interface make it ideal for compact, low-power embedded designs where a microcontroller-based SPI host is already present.
When designing with the MAX187CCWE, ensure the analog input does not exceed VDD + 0.3V to avoid latch-up. Place a 0.1 uF bypass capacitor close to the supply pin and keep analog traces short to minimize digital-noise coupling into the high-impedance input.
This page synthesizes distributor pricing, drop-in alternatives within the MAX187 family, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： MAX187CCWE ——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： MAX187CCWE （相同外形与封装尺寸） ——差异在于 Conversion Time, Package, Resolution, Shutdown Current.
快速对比工具——选择替代料号进行并排对比：
MAX187CCWE+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX187BCWE
✅ 直接替换📋 参考替代料（不在目录中）
MAX187ACWE
✅ 直接替换📋 参考替代料（不在目录中）
MAX187BCWE+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX189CCWE
✅ 直接替换📋 参考替代料（不在目录中）
MAX187CCWE 最大额定值与电气特性
| 分辨率 | 12 bit |
| 采样率 | 75 kSPS |
| Number of Channels | 1 |
| Input Type | Single-Ended |
| Architecture | SAR (Successive Approximation) |
| 电源电压 | 4.75 V to 5.25 V (single +5V) |
| Analog Input Range | 0 V to 5 V |
| Internal Reference | 4.096 V |
| Conversion Time | 8.5 us |
| Track/Hold Acquisition | 1.5 us |
| Operating Supply Current | 1.5 mA typical |
| 关断电流 | Few uA (microamps) |
| 接口 | 3-wire SPI/QSPI/Microwire compatible serial |
| 封装 | 16-pin SOIC wide (WSOIC-16) |
| 安装类型 | Surface Mount |
| 工作温度 | 0C to +70C (commercial grade, C suffix) |
MAX187CCWE 引脚配置
| 引脚 1 | VDD — +5V power supply input |
| 引脚 2 | AIN — Analog input (0V to 5V) |
| 引脚 3 | REF — Reference voltage (4.096V internal) |
| 引脚 4 | AGND — Analog ground |
| 引脚 5 | SHDN — Shutdown input, active low |
| 引脚 6 | DOUT — Serial data output |
| 引脚 7 | SCLK — Serial clock input |
| 引脚 8 | CS — Chip select, active low |
| 引脚 9 | DGND — Digital ground |
| 引脚 10 | NC — Not connected |
| 引脚 11 | NC — Not connected |
| 引脚 12 | NC — Not connected |
| 引脚 13 | NC — Not connected |
| 引脚 14 | NC — Not connected |
| 引脚 15 | NC — Not connected |
| 引脚 16 | NC — Not connected |
典型应用
MAX187CCWE 适用于 6 应用s: Portable Data Logging, Process Control Instrumentation, Pen Digitizer and Tablet Input, Isolated Data Acquisition Modules, Remote Sensor Signal Conditioning, Portable Medical Instruments.
Portable Data Logging
The MAX187CCWE is ideal for portable battery-powered data loggers requiring 12-bit accuracy at moderate sample rates. Its 1.5 mA active supply current and few-microamp shutdown current allow duty-cycled sampling schemes that extend battery life significantly - a logger sampling at 1 kHz with 99% idle time draws an average current well under 100 uA from a +5V rail. The internal 4.096V reference eliminates an external reference IC, reducing BOM cost and PCB area. The 3-wire SPI interface connects directly to microcontrollers such as PIC, AVR, and ARM Cortex-M0 parts, simplifying firmware integration. With 75 kSPS throughput, the device comfortably handles multi-channel multiplexed sensor acquisition when paired with an external analog mux. Recommended companion parts: MAX16052 (voltage supervisor) and MAX6033 (precision reference backup).
推荐
Process Control Instrumentation
In industrial process-control applications such as 4-20 mA loop-powered transmitters, PLC analog input modules, and SCADA remote terminal units, the MAX187CCWE delivers reliable 12-bit digitization of 0-5V transducer signals. Its SAR architecture provides deterministic latency with no pipeline delay, critical for closed-loop control loops. The 1.5 us acquisition time combined with 8.5 us conversion supports sampling multiple channels in sequence when used with a front-end mux. Hardware shutdown allows the ADC to be powered down between conversions to reduce heat dissipation in sealed enclosures. The commercial temperature grade (0C to +70C) suits control cabinet environments; for harsher industrial settings, the pin-compatible MAX187BCWE industrial-grade variant is recommended. Recommended companion parts: MAX14850 (isolated RS-485) and MAX31865 (RTD interface).
推荐
Pen Digitizer and Tablet Input
The MAX187CCWE is well suited to digitize the position signals from pen digitizers, graphic tablets, and touch-input overlays, where 12-bit resolution and 75 kSPS sampling capture stylus coordinates with smooth tracking. Its low 1.5 mA operating current extends battery life in wireless stylus designs, and the shutdown pin enables instant power-down when the pen is idle. The high-speed 3-wire serial interface streams conversion data directly to the tablet's microcontroller without burdening the SPI bus. The internal 4.096V reference provides a stable full-scale range that aligns well with typical digitizer sensor signal amplitudes, eliminating the need for an external reference IC and reducing the pen-tip BOM. Recommended companion parts: MAX17048 (battery fuel gauge) and MAX8814 (boost converter).
推荐
Isolated Data Acquisition Modules
For isolated analog input modules used in medical, industrial, or power-monitoring applications, the MAX187CCWE provides 12-bit digitization on the field side of an isolation barrier. Its low 1.5 mA supply current keeps field-side power dissipation low, easing thermal design in compact modules. The serial SPI interface crosses the isolation barrier with minimal channels - only three signals (CS, SCLK, DOUT) need to be optically or magnetically isolated, simplifying BOM cost. The internal 4.096V reference removes a part count on the field side, which is critical when isolation barriers make rework expensive. The shutdown pin can be tied to a microcontroller GPIO to enable duty-cycling, further reducing average current. Recommended companion parts: MAX14850 (digital isolator) and MAX31855 (thermocouple interface).
推荐
Remote Sensor Signal Conditioning
In remote sensor interface applications such as environmental monitoring stations, weather instruments, and agricultural IoT nodes, the MAX187CCWE digitizes analog sensor outputs with 12-bit accuracy. Its +5V single-supply operation matches common transducer excitation voltages, and the 0-5V input range accommodates the majority of bridge, thermistor, and electrochemical sensor outputs. The on-chip 4.096V reference simplifies calibration routines by providing a known full-scale value. The 75 kSPS throughput supports oversampling techniques to achieve effective resolution beyond 12 bits when lower bandwidth is acceptable. The shutdown mode drops quiescent current to a few microamps, enabling aggressive duty-cycling for solar-powered deployments. Recommended companion parts: MAX31865 (RTD) and MAX44009 (ambient light sensor).
推荐
Portable Medical Instruments
Battery-powered medical instruments such as handheld pulse oximeters, portable spirometers, and point-of-care diagnostic devices benefit from the MAX187CCWE's combination of 12-bit resolution, low 1.5 mA supply current, and small 16-pin SOIC package. The SAR architecture delivers a single-shot conversion result without pipeline delay, simplifying firmware synchronization with physiological events. The internal 4.096V reference minimizes external components - critical for medical devices where BOM count and board area affect cost and reliability. The shutdown feature reduces standby current to a few microamps between patient measurements, extending battery life across multi-day clinical shifts. The SPI-compatible 3-wire interface connects directly to low-power microcontrollers. Recommended companion parts: MAX30003 (biopotential AFE) and MAX86140 (PPG sensor).
推荐
推荐产品汇总
工程参考数据： MAX187CCWE ——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 | MAX187CCWE+T | MAX187BCWE | MAX187ACWE | MAX187BCWE+T | MAX189CCWE |
|---|---|---|---|---|---|---|
| Package | 16-pin SOIC wide (WSOIC-16) | 16-pin SOIC wide (WSOIC-16) - same | 16-pin SOIC wide (WSOIC-16) - same | 16-pin SOIC wide (WSOIC-16) - same | 16-pin SOIC wide (WSOIC-16) - same | 16-pin SOIC wide (WSOIC-16) - same |
| Brand | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 75 kSPS | 75 kSPS | 75 kSPS | 75 kSPS | 75 kSPS | 75 kSPS |
| Temperature Grade | Commercial 0C to +70C | Commercial 0C to +70C | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Commercial 0C to +70C |
| Internal Reference | Yes, 4.096V | Yes, 4.096V | Yes, 4.096V | Yes, 4.096V | Yes, 4.096V | No, external required |
| Linearity Grade (INL) | C-grade +/-1 LSB | C-grade +/-1 LSB | B-grade +/-0.5 LSB | A-grade +/-0.5 LSB (tighter) | B-grade +/-0.5 LSB | C-grade +/-1 LSB |
| Supply Current | 1.5 mA typical | 1.5 mA typical | 1.5 mA typical | 1.5 mA typical | 1.5 mA typical | 1.5 mA typical |
| Operating Supply Voltage | 4.75V to 5.25V (+5V nominal) | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V |
关键差异点
- Internal 4.096V reference integrated on-chip （对比 MAX189CCWE)
- Commercial temperature grade option at lowest cost （对比 MAX187BCWE)
- SAR architecture delivers deterministic zero-latency conversion （对比 MAX187ACWE (same A-grade upgrade))
设计说明
The MAX187CCWE draws 1.5 mA typical during active conversion, dropping to a few microamps in shutdown mode. Place a 0.1 uF ceramic bypass capacitor as close as possible to the VDD pin (pin 1) to suppress high-frequency noise from the internal clock and SAR logic. A 10 uF tantalum or ceramic bulk capacitor on the VDD rail provides additional low-frequency decoupling for clean reference performance. When operating from a switching regulator upstream, add an LC pi-filter or ferrite bead to prevent switching noise from coupling into the analog input through the supply pin.
Route analog input traces (AIN, REF) away from digital signals (CS, SCLK, DOUT) and high-current switching traces to minimize digital-noise coupling. Use a single-point ground connection between AGND (pin 4) and DGND (pin 9) at the ADC, with a continuous ground plane underneath the device to provide a low-impedance return path. The REF pin should be bypassed with a 4.7 uF to 10 uF low-ESR capacitor close to the pin to stabilize the internal reference and reduce conversion noise. Keep all analog traces short and use guard rings around the AIN trace if operating in high-noise environments.
The MAX187CCWE SAR ADC achieves 12-bit accuracy only when the input source can drive the 1.5 us acquisition time correctly. Source impedance above 1 kohm requires an external input buffer op-amp (such as the MAX9617 or MAX4230) to prevent acquisition-time distortion. The internal track/hold has a 30 pF hold capacitor that must charge fully during the 1.5 us acquisition window; undersized source drive leads to gain and linearity errors. For multiplexed applications, allow at least 1.5 us settling time after switching channels before initiating a conversion.
Do not exceed the absolute maximum analog input of VDD + 0.3V; voltages above this can trigger latch-up and permanently damage the device. Do not leave the SHDN pin floating - tie it to VDD through a 100 kohm resistor or drive it from a logic output; a floating SHDN pin can drift to mid-supply and cause unpredictable behavior. Do not drive the REF pin with an external source while VDD is removed, as reverse-current through the reference pin can damage the internal reference cell. Always verify the CS signal timing against the datasheet timing diagram, as CS rising during conversion will abort the conversion and corrupt the DOUT data.
合规信息
RoHS and REACH compliance status not directly stated in the verified distributor listings. Lead-free per Maxim Integrated RoHS transition. Not AEC-Q100 qualified - this is a commercial-grade ADC; automotive applications would require a different part. Conflict minerals compliance per Maxim Integrated declaration.
