MAX166CEWP - 8-Bit 200ksps SAR ADC with T/H & Reference | Maxim
MPN： MAX166CEWP ✓ 啟用中MAX166CEWP 概覽
A successive-approximation ADC is a type of data converter that uses a binary-search algorithm against an internal precision reference to digitize an analog input. The SAR architecture, combined with an integrated track-and-hold, delivers a 5 μs conversion time plus acquisition time while eliminating the need for an external reference. The MAX166 occupies a defined place in the signal-chain hierarchy: ADC → data converter → mixed-signal IC → semiconductor.
Key features include a single 5 V analog supply (with separate analog and digital grounds), an 8-bit parallel microprocessor interface with three-state latched outputs, standard chip-select (CS) and read (RD) control inputs, a BUSY status output, and an input range of 0 V to 2.46 V (or 0 V to VREF when an external reference is driven into the REF pin). Throughput is 200 ksps, conversion time is 5 μs, and the operating temperature range is -40 °C to +85 °C (C-grade / commercial-industrial).
Typical applications include process-control data acquisition, portable instrumentation, isolated industrial front ends, and embedded 8-bit microcontroller analog input modules where a small, reference-inclusive ADC simplifies the BOM and saves PCB area. Because the reference and T/H are integrated, the MAX166 is a strong fit for 4 mA-to-20 mA loop digitization through a single op-amp front end.
When designing with this device, place the 10 μF/0.1 μF decoupling pair as close as possible to VDD and AGND, keep the analog input trace short and guarded, and tie unused digital outputs (DB0-DB7) high through pull-ups if the bus will be shared with other peripherals. The MAX166C variant (commercial temperature range) is pin-compatible with the MAX166E extended-temperature version and with the MAX165 family.
This page consolidates distributor stock, parametric comparison, and PCB design notes that supplement the manufacturer datasheet with selection and sourcing context.
直接替換替代品，適用於 MAX166CEWP — 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： MAX166CEWP （相同外形與佔位） — 差異在於 Architecture, Conversion Time, Input Voltage Range, Internal Reference, Operating Temperature.
MAX166DEWP+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX166CCWP+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX166CEWP+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX166AEWP+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX165BCWN
✅ 直接替換聯絡詢價
查看資料表 →MAX166CEWP 最大額定值與電氣特性
| Manufacturer | Maxim Integrated (Analog Devices) |
| 功能 | Analog-to-Digital Converter (ADC) |
| 解析度 | 8 bit |
| Architecture | Successive Approximation (SAR) |
| Number of Channels | 1 |
| Sample Rate | 200 kSPS |
| Conversion Time | 5 us (typical) |
| 輸入電壓範圍 | 0 V to 2.46 V (or 0 V to VREF) |
| Internal Reference | 2.46 V bandgap (on-chip) |
| 供應電壓 | 5 V (single supply) |
| 介面 | Parallel, μP-compatible (CS, RD, BUSY) |
| 資料匯流排寬度 | 8 bit, three-state latched |
| Track-and-Hold | Yes, integrated |
| 工作溫度 | -40 C to +85 C |
| 封裝 | 20-pin SOIC (0.300 inch, wide body) |
| Screening Level | Industrial |
| 安裝類型 | Surface Mount |
MAX166CEWP 腳位配置
| 腳位 1 | DB4 — Data bit 4 output (three-state) |
| 腳位 2 | DB5 — Data bit 5 output (three-state) |
| 腳位 3 | DB6 — Data bit 6 output (three-state) |
| 腳位 4 | DB7 — Data bit 7 output (MSB, three-state) |
| 腳位 5 | BUSY — Busy output - high during conversion |
| 腳位 6 | RD — Read input - active low, enables output buffers |
| 腳位 7 | CS — Chip select - active low |
| 腳位 8 | DGND — Digital ground |
| 腳位 9 | DB0 — Data bit 0 output (LSB, three-state) |
| 腳位 10 | DB1 — Data bit 1 output (three-state) |
| 腳位 11 | DB2 — Data bit 2 output (three-state) |
| 腳位 12 | DB3 — Data bit 3 output (three-state) |
| 腳位 13 | VDD — +5 V digital supply |
| 腳位 14 | AGND — Analog ground |
| 腳位 15 | AIN — Analog input (0 V to 2.46 V) |
| 腳位 16 | REF — Reference voltage (2.46 V internal) |
| 腳位 17 | MODE — Mode select (read-mode / convert-mode) |
| 腳位 18 | WR — Write / convert-start input |
| 腳位 19 | VDD — +5 V analog supply |
| 腳位 20 | NC — Not connected (per datasheet) |
典型應用
MAX166CEWP 適用於 7 應用s: Industrial Process-Control Data Acquisition, Portable Instrumentation and Handheld Meters, Isolated Industrial Sensor Front End, Embedded Microcontroller Analog Input Modules, Automotive Sensor Signal Conditioning, Test and Measurement Front Panel Digitizers, Energy and Power-Metering Sub-Systems.
Industrial Process-Control Data Acquisition
The MAX166CEWP's 200 ksps sample rate, integrated 2.46 V reference, and integrated track-and-hold make it well suited to multi-loop industrial process control. A single MAX166CEWP digitizes a 4-20 mA loop after a 250 ohm sense resistor and a scaling op-amp, while the 8-bit parallel interface streams conversion results directly into a microcontroller or PLC front end. With 5 us conversion time, the part can comfortably over-sample each loop at 1 kHz, enabling digital averaging to improve effective resolution beyond the raw 8 bits. The -40 C to +85 C industrial temperature grade handles unconditioned cabinet environments without derating.
推薦
Portable Instrumentation and Handheld Meters
Battery-powered handheld meters benefit from the MAX166CEWP's single 5 V supply and integrated reference, which removes the need for an external reference IC and minimizes quiescent draw. The 20-SOIC wide-body package is easy to hand-solder and rework, simplifying prototyping. The 8-bit resolution is sufficient for bar-graph displays, simple digital panel meters, and handheld multimeter secondary inputs where absolute accuracy of about 0.5 percent of full scale is acceptable. The integrated track-and-hold removes the external sample-hold op-amp, shrinking the BOM and the PCB footprint.
推薦
Isolated Industrial Sensor Front End
In isolated analog input modules, the MAX166CEWP digitizes the analog signal on the field (high-voltage) side close to the sensor, sending only digital bits across the isolation barrier. This eliminates the bulky analog optocoupler or isolation amplifier and significantly improves noise immunity and CMRR. The MAX166CEWP's 200 ksps throughput comfortably handles 4-20 mA loop rates, thermocouple or RTD pre-amplified signals, and 0-10 V industrial control inputs. The parallel interface connects to a local microcontroller that then drives a digital isolator such as an ADuM1411.
推薦
Embedded Microcontroller Analog Input Modules
The MAX166CEWP's μP-compatible parallel bus, CS/RD control inputs, and BUSY flag make it a natural fit for 8051, PIC, and low-end ARM Cortex-M0 designs that lack a built-in ADC or need a fast external one. With 200 ksps throughput and 8-bit resolution it can digitize audio-bandwidth signals or capture fast transients on control lines. The integrated 2.46 V reference simplifies firmware calibration routines because the ADC's full-scale is internally defined, so the MCU only needs to apply a single gain trim value stored in EEPROM at production.
推薦
Automotive Sensor Signal Conditioning
When used with appropriate external TVS and RC filtering, the MAX166CEWP can digitize automotive sensors such as throttle position, pedal position, and HVAC damper feedback. The industrial -40 C to +85 C temperature grade handles cabin and under-hood-adjacent environments; for harsher under-hood placement an upgraded grade such as MAX166DEWP+ is recommended. The 200 ksps sample rate is overkill for slow automotive sensors but enables diagnostic oversampling and rapid fault detection. The parallel bus allows simple connection to a vehicle MCU without consuming scarce SPI resources.
推薦
Test and Measurement Front Panel Digitizers
Bench-top instruments such as bench multimeters, panel meters, and laboratory data loggers can use the MAX166CEWP for low-cost analog input digitizing where 8-bit resolution is acceptable. The 200 ksps sample rate supports waveform capture of audio-bandwidth signals or transient events. The MAX166CEWP's integrated track-and-hold eliminates the need for an external sample-and-hold amplifier, while the parallel interface streams data into an FPGA or microcontroller display driver. The wide 20-SOIC package simplifies hand rework during development.
推薦
Energy and Power-Metering Sub-Systems
Single-phase energy meters and power-monitoring modules use the MAX166CEWP to digitize current-sense signals from a shunt or current transformer after signal conditioning. The integrated 2.46 V reference is stable enough to maintain AC-line measurement accuracy to about 1 percent over the industrial temperature range. The 8-bit resolution is sufficient for cost-optimized residential energy meters where a separate metering IC is too expensive. The 200 ksps sample rate allows sampling of the 50/60 Hz mains many times per cycle, supporting RMS and reactive-power calculations in firmware.
推薦
推薦產品摘要
工程參考資料，適用於 MAX166CEWP — 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 | MAX166DEWP+ | MAX166CCWP+ | MAX166CEWP+ | MAX166AEWP+ | MAX165BCWN |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 20-SOIC (wide, 0.300 in) | 20-SOIC (wide, 0.300 in) - same | 20-SOIC (wide, 0.300 in) - same | 20-SOIC (wide, 0.300 in) - same | 20-SOIC (wide, 0.300 in) - same | 18-SOIC |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Sample Rate | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 200 ksps |
| Internal Reference | Yes (2.46 V bandgap) | Yes (2.46 V) | Yes (2.46 V) | Yes (2.46 V) | Yes (2.46 V) | No (external required) |
| Operating Temperature | -40 C to +85 C | -55 C to +125 C (extended) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | -40 C to +85 C (automotive grade) | 0 C to +70 C |
| Interface | Parallel 8-bit (CS/RD/BUSY) | Parallel 8-bit - same | Parallel 8-bit - same | Parallel 8-bit - same | Parallel 8-bit - same | Parallel 8-bit - same |
| Track-and-Hold | Integrated | Integrated | Integrated | Integrated | Integrated | Integrated |
主要差異化特點
- Integrated 2.46 V reference eliminates an external reference IC (對比MAX165BCWN)
- Extended-temperature sibling MAX166DEWP+ available with same pinout (對比MAX166CCWP+)
- Industrial -40 C to +85 C temperature grade as standard (對比MAX166CCWP+ (commercial 0 C to +70 C))
- Lead-free / RoHS-compliant + variant available with same die (對比MAX166CEWP (non-plus SnPb finish))
設計說明
Estimated: at 5 V supply the MAX166CEWP draws approximately 4-6 mA during active conversion, equivalent to 20-30 mW. Decouple VDD (pin 13) and the AVDD pin (pin 19) with a 10 uF tantalum or ceramic plus a 0.1 uF ceramic placed within 5 mm of each supply pin. Keep the AGND and DGND pins tied to a common ground plane at a single point near the ADC; do not run digital return currents through the analog ground trace, as this couples switching noise into the reference.
Route the analog input trace as a guarded pair with AGND on both sides, and keep it short (under 25 mm) to minimize coupling from digital lines. Place the REF decoupling capacitor (typically 10 uF electrolytic in parallel with 0.1 uF ceramic) directly at pin 16, and avoid routing digital signals (DB0-DB7, CS, RD, BUSY) across the analog input or reference traces. If the design uses the internal reference, do not draw DC current from REF - buffer it with an op-amp if multiple loads must be driven.
Three common pitfalls: (1) Driving the analog input beyond 0 V to 2.46 V (or VDD), which can latch up or damage the input; always add a clamping/TVS structure for industrial use. (2) Forgetting to wait for BUSY to fall before reading DB0-DB7 - the datasheet's timing diagram shows a 5 us conversion window. (3) Using a long CS pulse when reading; CS must remain low for the entire read cycle and must be de-asserted between conversions if the bus is shared. Failing to handle the BUSY-to-data delay correctly is the most frequent cause of misread conversions.
Use a star-ground topology with AGND and DGND tied at a single point under the IC. Place the MAX166CEWP close to the analog input connector so the analog signal never has to cross digital regions. Place a small ferrite bead or 10 ohm resistor in series with VDD to suppress digital switching noise from entering the analog supply. Keep the parallel data bus traces short and series-terminate with 33-47 ohm resistors if the bus runs longer than 50 mm to the host microcontroller.
合規資訊
RoHS compliance refers to the MAX166CEWP+ variant (lead-free finish); the legacy MAX166CEWP non-plus variant uses SnPb finish. AEC-Q100 not applicable to C/E grades - choose MAX166AEWP+ for automotive qualification.
