MAX190ACWG - 12-Bit 75ksps SAR ADC, SOIC-24 | Analog Devices
料号： MAX190ACWG ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $24.52 | $24.52 |
| 10 | $22.1 | $221.00 |
| 100 | $19.45 | $1,945.00 |
| 500 | $17.8 | $8,900.00 |
| 1,000 | $16.2 | $16,200.00 |
MAX190ACWG 概述
An ADC (Analog-to-Digital Converter) is a data-acquisition component that converts continuous analog signals into discrete digital codes. The MAX190 belongs to the SAR (Successive Approximation Register) family of ADCs, which sit in the broader hierarchy: SAR ADC -> data converter -> ADC/DAC -> signal-chain IC -> semiconductor. SAR ADCs offer a strong balance of speed, resolution, and power for multiplexed or single-channel precision measurement in industrial, instrumentation, and process-control systems.
Key features of the MAX190ACWG include ±0.5 LSB integral nonlinearity (INL) in the A-grade, internal low-drift reference, software-configurable unipolar (0 to +5V) or bipolar (±5V) analog input range, and a Byte-wide parallel data interface. The device requires an external 2.5 MHz to 5 MHz serial clock, and its 100 ns acquisition time supports full 75 ksps conversion throughput on a single acquisition/conversion cycle. The integrated reference eliminates the need for external precision components, reducing BOM cost and PCB area.
Typical applications include data-logging systems, pen digitizers, portable instrumentation, industrial process control, and battery-powered measurement equipment where the 60 µA power-down mode significantly extends battery life. The MAX190ACWG is the commercial temperature grade (0°C to +70°C), while the MAX190AEWG is the extended temperature grade (−40°C to +85°C) for harsher environments. Designers should add a 10 µF bypass capacitor on the analog supply and follow standard ADC layout practices — keep analog and digital ground planes separate and connect them only at a single point near the IC.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers evaluate the MAX190ACWG for both new designs and legacy maintenance.
直接替换替代料： MAX190ACWG ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MAX190AEWG+
✅ 直接替换📋 参考替代料（不在目录中）
MAX190BCWG+
✅ 直接替换📋 参考替代料（不在目录中）
MAX190BEWG+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX190ACWG+
✅ 直接替换📋 参考替代料（不在目录中）
MAX190BCNG
✅ 直接替换📋 参考替代料（不在目录中）
MAX190ACWG 最大额定值与电气特性
| 分辨率 | 12 bits |
| Sample Rate | 75 ksps |
| Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 1 input |
| Analog Supply Voltage | 4.75 V to 5.25 V (single +5V supply) |
| Digital Supply Voltage | Compatible with +5V logic |
| Analog Input Range | 0 V to +5 V (unipolar) or ±5 V (bipolar, software-configurable) |
| Integral Nonlinearity (INL) | ±0.5 LSB (A-grade, max) |
| Internal Reference Voltage | 4.096 V |
| 静态电流 | 3 mA (active), 60 µA (power-down) |
| Input Acquisition Time | 100 ns |
| External Clock | 2.5 MHz to 5 MHz |
| Data Interface | Byte-wide parallel |
| 工作温度范围 | 0 °C to +70 °C (commercial, AC suffix) |
| 封装 | 24-pin SOIC (wide, 7.5 mm body width) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (lead-free + suffix) |
MAX190ACWG 引脚配置
| 引脚 1 | AGND — Analog ground |
| 引脚 2 | AIN — Analog input |
| 引脚 3 | AGND — Analog ground (sense pin) |
| 引脚 4 | REF — Internal 4.096 V reference output |
| 引脚 5 | REFADJ — Reference adjust input |
| 引脚 6 | AVDD — Analog +5 V supply |
| 引脚 7 | DVDD — Digital +5 V supply |
| 引脚 8 | DGND — Digital ground |
| 引脚 9 | DOUT11 — Data output bit 11 (MSB) |
| 引脚 10 | DOUT10 — Data output bit 10 |
| 引脚 11 | DOUT9 — Data output bit 9 |
| 引脚 12 | DOUT8 — Data output bit 8 |
| 引脚 13 | DOUT7 — Data output bit 7 |
| 引脚 14 | DOUT6 — Data output bit 6 |
| 引脚 15 | DOUT5 — Data output bit 5 |
| 引脚 16 | DOUT4 — Data output bit 4 |
| 引脚 17 | DOUT3 — Data output bit 3 |
| 引脚 18 | DOUT2 — Data output bit 2 |
| 引脚 19 | DOUT1 — Data output bit 1 |
| 引脚 20 | DOUT0 — Data output bit 0 (LSB) |
| 引脚 21 | BIPOLAR — Input range select: LOW = 0-5V, HIGH = ±5V |
| 引脚 22 | CLK — External clock input (2.5-5 MHz) |
| 引脚 23 | CS — Chip select (active low) |
| 引脚 24 | HBEN — High-byte enable for byte-wide read |
典型应用
MAX190ACWG 适用于 6 应用s: Industrial Process Control / PLC Analog Input Modules, Portable Data Loggers, Pen Digitizers and Tablet Input, Test & Measurement Instrumentation, Medical Monitoring Equipment, Battery-Powered Measurement.
Industrial Process Control / PLC Analog Input Modules
The MAX190ACWG's ±0.5 LSB INL and software-configurable 0-5 V / ±5 V input range make it well suited for industrial PLC analog input modules. Its internal 4.096 V reference eliminates an external reference component, simplifying BOM and reducing drift over temperature. At 75 ksps it samples 4-20 mA-conditioned signals or direct thermocouple/bridge outputs through a front-end mux, while the 60 µA power-down mode supports low-duty-cycle scan architectures. Designers should add 10 µF + 0.1 µF supply bypass and keep analog/digital grounds separated to a single point.
推荐
Portable Data Loggers
The MAX190ACWG is well matched to portable data loggers because its 60 µA power-down mode dramatically extends battery life between sample bursts, and the integrated 4.096 V reference removes the cost and current draw of an external precision reference. The 75 ksps sample rate easily handles multi-channel sensor scans through an external mux, while the 12-bit resolution covers temperature, voltage, and strain-gauge measurements with adequate dynamic range. The byte-wide parallel interface supports a quick read-out to a microcontroller or low-power FPGA during periodic wake-up cycles.
推荐
Pen Digitizers and Tablet Input
The MAX190ACWG's 75 ksps sampling rate and 100 ns acquisition time are well suited to pen-digitizer and tablet-input applications, where the digitizer must capture stylus position updates at high refresh rates. Its internal reference simplifies the analog front end, and the 12-bit resolution delivers 4096 levels per axis — sufficient for sub-pixel tablet accuracy. The parallel data interface allows a host microcontroller to read coordinates quickly between display refresh cycles. The commercial 0-70°C range covers indoor use; choose the MAX190AEWG for outdoor tablets.
推荐
Test & Measurement Instrumentation
For bench-top and rack-mount test instruments, the MAX190ACWG's ±0.5 LSB INL and internal low-drift reference provide the linearity needed for accurate voltage, current, and sensor measurements. The byte-wide parallel output simplifies connection to legacy 8-bit microcontrollers and DSPs without a serial-interface controller. The 75 ksps rate is sufficient for non-oscilloscope measurement instruments — DMMs, source-measure units, and dataloggers — and the ±5 V bipolar range allows direct digitization of signals without external conditioning.
推荐
Medical Monitoring Equipment
The MAX190ACWG's 12-bit resolution and ±0.5 LSB INL are well suited to medical monitoring equipment like bedside patient monitors, where the ADC digitizes filtered ECG, SpO2, or temperature signals. The internal reference removes drift concerns that plague external references in long-life medical devices. The 60 µA power-down mode extends battery life on portable patient monitors. The commercial 0-70°C range covers most clinical environments; for ambulance/field use choose the MAX190AEWG (extended temp). The SAR architecture provides instant-on sampling needed for real-time waveforms.
推荐
Battery-Powered Measurement
The MAX190ACWG's software-controlled power-down mode at just 60 µA enables low-duty-cycle battery-powered measurement applications. A microcontroller can power-up the ADC for a single conversion and immediately drop back to sleep, dramatically extending battery life in remote sensor nodes. The internal 4.096 V reference eliminates the standby current of an external reference. At 75 ksps the ADC samples faster than most sensor bandwidths, allowing oversampling for noise reduction. The wide-input voltage range supports direct battery-monitoring on lithium battery stacks up to 5V per cell.
推荐
推荐产品汇总
工程参考数据： MAX190ACWG ——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 | MAX190AEWG+ | MAX190BCWG+ | MAX190BEWG+ | MAX190ACWG+ | MAX190BCNG |
|---|---|---|---|---|---|---|
| Package | 24-pin SOIC (WG) | 24-pin SOIC (WG) - same | 24-pin SOIC (WG) - same | 24-pin SOIC (WG) - same | 24-pin SOIC (WG) - same | 24-pin DIP (NG) - through-hole |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sample Rate | 75 ksps | 75 ksps | 75 ksps | 75 ksps | 75 ksps | 75 ksps |
| INL (max) | ±0.5 LSB (A-grade) | ±0.5 LSB (A-grade) | ±1 LSB (B-grade) | ±1 LSB (B-grade) | ±0.5 LSB (A-grade) | ±1 LSB (B-grade) |
| Operating Temperature | 0 °C to +70 °C | −40 °C to +85 °C (extended) | 0 °C to +70 °C | −40 °C to +85 °C (extended) | 0 °C to +70 °C | 0 °C to +70 °C |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| Power-Down Current | 60 µA | 60 µA | 60 µA | 60 µA | 60 µA | 60 µA |
| Active Supply Current | 3 mA (typ) | 3 mA (typ) | 3 mA (typ) | 3 mA (typ) | 3 mA (typ) | 3 mA (typ) |
关键差异点
- A-grade linearity ( ±0.5 LSB INL) （对比 MAX190BCWG+)
- Commercial temperature grade pricing advantage （对比 MAX190AEWG+)
- Integrated precision reference eliminates external components （对比 MAX1290 (successor))
设计说明
Power the MAX190ACWG from a clean +5V analog supply; add a 10 µF tantalum or ceramic + 0.1 µF ceramic bypass as close as possible to the AVDD pin (pin 6). The DVDD pin (pin 7) should be tied to the same +5V supply but bypassed separately to avoid digital switching noise coupling into the analog domain. Estimated: with 3 mA active current and 5V supply, the ADC dissipates approximately 15 mW — a negligible thermal load.
Use a separate analog ground plane and a separate digital ground plane on the PCB, joining them at a single point directly under the MAX190ACWG (the AGND/DGND pins). Route digital output lines (DOUT0-DOUT11) away from the analog input and REF pins to avoid coupling switching transients into the input signal path. Place the 10 µF supply bypass capacitor on the same layer as the IC to minimize via inductance.
Do not exceed the absolute maximum analog input voltage of ±15 V on AIN (pin 2) — over-voltage on the analog input can permanently damage the device. Tie the BIPOLAR pin (pin 21) HIGH for ±5V bipolar mode and LOW for 0-5V unipolar mode; software-controlled input range is not supported. The CLK pin (pin 22) requires an external 2.5-5 MHz clock — operation without a clock will halt conversion. Ensure HBEN (pin 24) is tied LOW for low-byte-first reads or HIGH for high-byte-first reads.
合规信息
MAX190ACWG is lead-free and RoHS compliant per Maxim/Analog Devices product page. Not AEC-Q100 qualified — this is a commercial/industrial part, not an automotive-grade ADC. For automotive designs choose MAX190xEWG variants only after qualifying for the specific automotive environment.
