MAX174CCWI+ - 12-Bit 125ksps SAR ADC with 10V Input Range | Maxim Integrated
MPN： MAX174CCWI+ ✓ 啟用中MAX174CCWI+ 概覽
An ADC (analog-to-digital converter) is a data-conversion integrated circuit that translates a continuous analog voltage into a discrete digital code, forming the front-end of every digital signal acquisition system. SAR (successive-approximation register) ADCs use a binary-search algorithm with an internal DAC, delivering deterministic latency, low power consumption, and excellent static linearity - making them the standard choice for industrial process control, instrumentation, and multi-channel data-acquisition boards.
Key features include 12-bit resolution with no missing codes, ±1 LSB maximum integral nonlinearity (INL), ±0.5 LSB differential nonlinearity (DNL), and a 25 µs typical acquisition time. The MAX174 shares an industry-standard pinout with the MX574A and MX674A, the latter two being 12-bit and 12-bit high-speed variants respectively. An on-chip clock oscillator requires no external crystal, and internal buried-zener reference maintains ±0.05%/week long-term stability.
The architecture employs a precision charge-redistribution DAC array together with a low-noise comparator and a successive-approximation register; the input signal is sampled onto a 5 pF acquisition capacitor during the acquisition phase, and conversion proceeds under control of the on-chip oscillator. The MAX174 is offered in commercial (0°C to +70°C, MAX174CCWI) and extended (-40°C to +85°C) grades.
Typical applications include industrial process-control loops, multi-channel data-acquisition front ends, panel meters, digital panel instrumentation, and audio spectrum analyzers. Designers frequently choose this part when a complete, ready-to-use 12-bit ADC with an internal reference and 8/16-bit parallel bus simplifies board layout.
When designing with the MAX174, calculate the analog input scaling resistors precisely to avoid exceeding the 25 V absolute maximum at any analog input pin, and add 0.1 µF bypass capacitors plus a 10 µF tantalum bulk capacitor to the +VCC and -VSS pins within 7 mm of the package.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 MAX174CCWI+ — 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： MAX174CCWI+ （相同外形與佔位） — 差異在於 Internal Reference, Package, Mounting Type, Architecture, Input Voltage Range (Bipolar).
MX574AKEWI
✅ 直接替換📋 參考替代品（不在目錄中）
MX674AKEWI
✅ 直接替換📋 參考替代品（不在目錄中）
MAX174ACWI
✅ 直接替換聯絡詢價
查看資料表 →MAX174BEPI
✅ 直接替換聯絡詢價
查看資料表 →MAX174CCWI+ 最大額定值與電氣特性
| 解析度 | 12 bits |
| Architecture | SAR (Successive Approximation) |
| 取樣率 | 125 ksps |
| Number of Input Channels | 1 |
| Input Voltage Range (Unipolar) | 0 V to +10 V |
| Input Voltage Range (Bipolar) | ±5 V, ±10 V (with external scaling) |
| Integral Nonlinearity (INL) | ±1 LSB (max) |
| Differential Nonlinearity (DNL) | ±0.5 LSB (max) |
| Internal Reference | 10 V buried-zener, ±0.05%/week stability |
| Digital Interface | Parallel (8/16-bit bus compatible) |
| Acquisition Time | 25 µs (typ) |
| Conversion Trigger | R/C (Convert Start) input |
| 工作溫度範圍 | 0 °C to +70 °C (commercial grade) |
| 封裝 | 28-pin SOIC (Wide, 7.5 mm body) |
| 安裝類型 | Surface Mount |
| 供應電壓 | ±15 V and +5 V (typical) |
| Lead Free / RoHS | Lead-free (RoHS compliant per '+' suffix) |
MAX174CCWI+ 腳位配置
| 腳位 1 | VCC — +5 V digital supply |
| 腳位 2 | DGND — Digital ground return |
| 腳位 3 | D11 (MSB) — Parallel data bit 11 (MSB) |
| 腳位 4 | D10 — Parallel data bit 10 |
| 腳位 5 | D9 — Parallel data bit 9 |
| 腳位 6 | D8 — Parallel data bit 8 |
| 腳位 7 | D7 — Parallel data bit 7 |
| 腳位 8 | D6 — Parallel data bit 6 |
| 腳位 9 | D5 — Parallel data bit 5 |
| 腳位 10 | D4 — Parallel data bit 4 |
| 腳位 11 | D3 — Parallel data bit 3 |
| 腳位 12 | D2 — Parallel data bit 2 |
| 腳位 13 | D1 — Parallel data bit 1 |
| 腳位 14 | D0 (LSB) — Parallel data bit 0 (LSB) |
| 腳位 15 | STS — Status flag output |
| 腳位 16 | R/C — Read/Convert Start (active low) |
| 腳位 17 | CE — Chip Enable (active high) |
| 腳位 18 | CS — Chip Select |
| 腳位 19 | REF OUT — Internal reference output (10 V) |
| 腳位 20 | REF IN — Reference input |
| 腳位 21 | REF GND — Reference ground |
| 腳位 22 | BIP OFF — Bipolar offset adjust |
| 腳位 23 | 10V IN — Analog input (unipolar 0-10 V) |
| 腳位 24 | 20V IN — Analog input (bipolar ±10 V via scaling) |
| 腳位 25 | AGND — Analog ground |
| 腳位 26 | +15V — Positive analog supply |
| 腳位 27 | -15V — Negative analog supply |
| 腳位 28 | NC — Not connected (per datasheet) |
典型應用
MAX174CCWI+ 適用於 6 應用s: Industrial Process-Control Front End, Multi-Channel Data-Acquisition Boards, Digital Panel Meters and Instrumentation, Audio Spectrum Analyzers and Test Equipment, Battery-Powered Remote Sensor Conditioning, Medical Monitoring Front End.
Industrial Process-Control Front End
The MAX174CCWI+ is well suited for industrial process-control front ends because its ±10 V input range directly accepts the 4-20 mA sense resistor-derived voltages used in PLC analog input modules, and the integrated buried-zener reference eliminates drift over weeks of continuous operation. Designers can build a complete 4-channel data-acquisition board with four MAX174 devices, multiplexed onto a parallel bus, achieving 0.024% FSR measurement accuracy at room temperature. The 12-bit resolution over 10 V gives 2.44 mV LSB, ideal for thermocouple cold-junction compensation and strain-gauge signal conditioning.
推薦
Multi-Channel Data-Acquisition Boards
Data-acquisition boards for industrial PCs and rack-mounted instruments benefit from the MAX174CCWI+ because of its standard 8/16-bit parallel interface and processor-friendly control pins (R/C, CS, CE), allowing direct connection to 8080/8086-style buses without external glue logic. The integrated reference keeps the BOM cost low while the 125 ksps throughput supports sub-millisecond per-channel sample times when channels are multiplexed. The 28-pin SOIC wide-body footprint accepts a 1.27 mm pitch, matching most DAQ motherboard artwork designed around the original AD574A pinout.
推薦
Digital Panel Meters and Instrumentation
Digital panel meters and bench-top instrumentation depend on the MAX174CCWI+ for its 12-bit resolution, low integral nonlinearity, and ready-to-use parallel output that drives BCD/7-segment display drivers directly. The 0-10 V input range matches analog panel-meter scaling derived from current-shunt resistors, and the 8-bit bus mode simplifies connection to legacy 8051-class microcontrollers. The internal reference maintains display calibration over weeks without recalibration, an advantage in field-installed metering.
推薦
Audio Spectrum Analyzers and Test Equipment
Audio spectrum analyzers and laboratory test equipment use the MAX174CCWI+ where a 125 ksps throughput can capture audio-band signals up to the Nyquist limit, with 12-bit resolution sufficient for -72 dB dynamic range. The internal reference eliminates power-rail coupling effects that compromise low-noise audio measurements. The wide-body SOIC package shields the analog section on the left bank and digital section on the right bank, simplifying four-layer PCB layout with separate analog and digital ground returns.
推薦
Battery-Powered Remote Sensor Conditioning
Although the MAX174CCWI+ is not the lowest-power ADC available, it serves well in remote sensor-conditioning hubs when paired with a sleep-mode analog front end, because its parallel output supports burst sampling at full 125 ksps with the converter deselected between bursts. Designers can achieve long battery life by adding an external CMOS multiplexer that powers down between samples, while the MAX174CCWI+ itself provides the settled 12-bit conversion result on demand.
推薦
Medical Monitoring Front End
Medical monitoring front ends for non-critical-care patient monitors use the MAX174CCWI+ when 12-bit resolution, ±10 V input range, and traceability to a national-standard 10 V reference are required for ECG, SPO2, or respiration analog-front-end signal chains. The integrated reference and proven long-term drift performance simplify medical-device qualification, while the wide-body 28-pin SOIC accepts vibration-tolerant conformal coatings for desktop and rolling-cart installations.
推薦
推薦產品摘要
工程參考資料，適用於 MAX174CCWI+ — 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 | MX574AKEWI | MX674AKEWI | MAX174ACWI | MAX174BEPI |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-pin SOIC (Wide, 7.5 mm body) | 28-pin SOIC (Wide, 7.5 mm body) - same | 28-pin SOIC (Wide, 7.5 mm body) - same | 28-pin SOIC (Wide, 7.5 mm body) - same | 28-pin SOIC (Wide, 7.5 mm body) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Conversion Time | 25 µs | 15 µs (-40%) | 8 µs (-68%) | 25 µs (same) | 25 µs (same) |
| INL (max) | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB | ±0.45 LSB |
| DNL (max) | ±0.5 LSB | ±0.5 LSB | ±0.5 LSB | ±0.5 LSB | ±0.45 LSB |
| Operating Temperature | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Internal Reference | 10 V buried-zener, ±0.05%/week | 10 V buried-zener, ±0.05%/week | 10 V buried-zener, ±0.05%/week | 10 V buried-zener, ±0.05%/week | 10 V buried-zener, ±0.05%/week |
主要差異化特點
- Lowest cost in the MAX/MX same-package family (對比MX574AKEWI)
- Industrial-grade temperature variant available in same package (對比MAX174ACWI)
- Best linearity in the family (對比MAX174BEPI)
設計說明
The MAX174CCWI+ requires three supplies - +5 V digital, +15 V analog, and -15 V analog - each decoupled independently per datasheet reference circuits. Place a 0.1 µF ceramic plus 10 µF tantalum within 7 mm of the +VCC, +15 V, and -15 V pins. Use star-ground topology with AGND and DGND tied at a single point under the IC's exposed pad to avoid ground-loop noise injecting into the analog reference.
When laying out the PCB, place the analog input scaling resistors as close to pin 23/24 as possible to minimize leakage and stray capacitance. Route the parallel data bus traces (D0-D11) away from the analog section by at least 5 mm, and ensure the AGND and DGND planes are joined only beneath pin 28 / the package thermal pad. Analog and digital power planes should not overlap directly under the IC to prevent digital noise injection into the reference.
Do not exceed ±25 V at any analog input pin - even brief transients during power sequencing can latch up the input protection diodes. Always power up the +15 V and -15 V analog rails before applying any analog input. The 28-pin wide-body SOIC is wider than the standard narrow-body SOIC; verify pad dimensions before ordering the PCB to avoid a rework. The R/C pin has internal pull-up; add a 1 kΩ series resistor if driving from a logic IC rated below 5 V.
For the best 12-bit dynamic performance at 125 ksps, drive the analog input from a low-impedance op-amp buffer such as the MAX410 or similar, with a 1 kΩ series resistor and 100 pF capacitor to ground to form a low-pass anti-alias filter at the analog input. Buffer slew rate should exceed 5 V/µs. Keep the analog input traces guarded with analog ground on both sides of the routing channel to minimize digital cross-coupling.
合規資訊
Lead-free '+' suffix indicates RoHS-compliant lead-free reflow. Halogen-free status was not listed in the Verified Web Data and is set to 'unknown'. AEC-Q100 is not applicable - choose MAX174A-series for industrial grade.
