MAX174CCWI+ - 12-Bit 125ksps SAR ADC with 10V Input Range | Maxim Integrated
MPN: MAX174CCWI+ ✓ Hoạt độngMAX174CCWI+ Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MAX174CCWI+ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MAX174CCWI+ (cùng hình factor và footprint) — khác nhau ở Internal Reference, Package, Mounting Type, Architecture, Input Voltage Range (Bipolar).
MX574AKEWI
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MX674AKEWI
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX174ACWI
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX174BEPI
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX174CCWI+ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Architecture | SAR (Successive Approximation) |
| Tỷ lệ lấy mẫu | 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 |
| Khoảng nhiệt độ hoạt động | 0 °C to +70 °C (commercial grade) |
| Hộp | 28-pin SOIC (Wide, 7.5 mm body) |
| Kiểu lắp đặt | Surface Mount |
| Điện áp cung cấp | ±15 V and +5 V (typical) |
| Lead Free / RoHS | Lead-free (RoHS compliant per '+' suffix) |
Cấu hình chân MAX174CCWI+
| Chân 1 | VCC — +5 V digital supply |
| Chân 2 | DGND — Digital ground return |
| Chân 3 | D11 (MSB) — Parallel data bit 11 (MSB) |
| Chân 4 | D10 — Parallel data bit 10 |
| Chân 5 | D9 — Parallel data bit 9 |
| Chân 6 | D8 — Parallel data bit 8 |
| Chân 7 | D7 — Parallel data bit 7 |
| Chân 8 | D6 — Parallel data bit 6 |
| Chân 9 | D5 — Parallel data bit 5 |
| Chân 10 | D4 — Parallel data bit 4 |
| Chân 11 | D3 — Parallel data bit 3 |
| Chân 12 | D2 — Parallel data bit 2 |
| Chân 13 | D1 — Parallel data bit 1 |
| Chân 14 | D0 (LSB) — Parallel data bit 0 (LSB) |
| Chân 15 | STS — Status flag output |
| Chân 16 | R/C — Read/Convert Start (active low) |
| Chân 17 | CE — Chip Enable (active high) |
| Chân 18 | CS — Chip Select |
| Chân 19 | REF OUT — Internal reference output (10 V) |
| Chân 20 | REF IN — Reference input |
| Chân 21 | REF GND — Reference ground |
| Chân 22 | BIP OFF — Bipolar offset adjust |
| Chân 23 | 10V IN — Analog input (unipolar 0-10 V) |
| Chân 24 | 20V IN — Analog input (bipolar ±10 V via scaling) |
| Chân 25 | AGND — Analog ground |
| Chân 26 | +15V — Positive analog supply |
| Chân 27 | -15V — Negative analog supply |
| Chân 28 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
MAX174CCWI+ phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX174CCWI+ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Lowest cost in the MAX/MX same-package family (vsMX574AKEWI)
- Industrial-grade temperature variant available in same package (vsMAX174ACWI)
- Best linearity in the family (vsMAX174BEPI)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
