MAX154AEWG - 8-Bit 4Ch 2.5us ADC w/ Reference | Maxim Integrated
料号： MAX154AEWG ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.45 | $18.45 |
| 10 | $16.5 | $165.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.95 | $5,975.00 |
| 1,000 | $10.45 | $10,450.00 |
MAX154AEWG 概述
An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that samples a continuous analog voltage and converts it into a discrete digital code, typically N-bit binary. SAR ADCs use a binary-search successive-approximation algorithm with an internal DAC and comparator, achieving an excellent balance of speed, resolution, and power consumption for data acquisition, instrumentation, and process-control applications. The MAX154 family sits in the hierarchy: SAR ADC -> ADC -> data converter -> mixed-signal IC -> semiconductor.
Key features include four single-ended analog inputs (the pin-compatible MAX158 offers eight), a 2.5V internal bandgap reference (5 V external reference also accepted), ratiometric operation, and an on-chip track/hold. The MAX154AEWG provides 1/2 LSB integral nonlinearity and ±1 LSB total unadjusted error, with low-power CMOS design drawing only a few mW during continuous conversion.
The MAX154AEWG uses a standard SAR architecture with internal clock generation, allowing simple microprocessor interface through standard CS, RD, and WR control lines. It connects directly to most 8-bit parallel buses without external glue logic. The wide input voltage range (single +5 V supply) and ratiometric capability make it suitable for both absolute and proportional measurements.
Typical applications include data acquisition systems, process control, digital signal processing front-ends, multiplexed sensor monitoring, and portable instruments. The four-channel input makes it ideal for low-channel-count multi-signal monitoring without an external MUX.
When designing with this device, observe the recommended 0.1 uF decoupling capacitor on VDD, keep analog and digital ground planes separated, and ensure analog inputs stay within the specified input range (0 V to VREF or 0 V to 5 V).
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found on the manufacturer datasheet, giving engineers a single reference for sourcing, comparison, and design-in.
直接替换替代料： MAX154AEWG ——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： MAX154AEWG （相同外形与封装尺寸） ——差异在于 Number of Input Channels, Operating Temperature, Package, Resolution, Integral Nonlinearity (INL).
快速对比工具——选择替代料号进行并排对比：
MAX154AEWG+
✅ 直接替换📋 参考替代料（不在目录中）
MAX154BEWG+
✅ 直接替换📋 参考替代料（不在目录中）
MAX154BCWG+
✅ 直接替换📋 参考替代料（不在目录中）
MAX158
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX154AEWG 最大额定值与电气特性
| 分辨率 | 8 bit |
| Number of Input Channels | 4 |
| Conversion Architecture | SAR (Successive Approximation) |
| Conversion Time per Channel | 2.5 us (typical) |
| Internal Reference | 2.5 V (bandgap) |
| Supply Voltage (VDD) | +5 V (single supply) |
| Analog Input Range | 0 V to VREF (ratiometric mode) |
| Integral Nonlinearity (INL) | 1/2 LSB (max) |
| Total Unadjusted Error | 1 LSB (max) |
| 工作温度 | -40 C to +85 C (industrial) |
| Temperature Grade | Industrial |
| 封装 | 24-SOIC (Wide, 7.5 mm body width) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
MAX154AEWG 引脚配置
| 引脚 1 | AIN1 — Analog input channel 1 |
| 引脚 2 | AIN2 — Analog input channel 2 |
| 引脚 3 | AIN3 — Analog input channel 3 |
| 引脚 4 | AIN4 — Analog input channel 4 |
| 引脚 5 | AGND — Analog ground |
| 引脚 6 | VDD — +5 V supply |
| 引脚 7 | DGND — Digital ground |
| 引脚 8 | REF — Reference input/output (2.5 V internal) |
| 引脚 9 | DB0 — Digital output bit 0 (LSB) |
| 引脚 10 | DB1 — Digital output bit 1 |
| 引脚 11 | DB2 — Digital output bit 2 |
| 引脚 12 | DB3 — Digital output bit 3 |
| 引脚 13 | DB4 — Digital output bit 4 |
| 引脚 14 | DB5 — Digital output bit 5 |
| 引脚 15 | DB6 — Digital output bit 6 |
| 引脚 16 | DB7 — Digital output bit 7 (MSB) |
| 引脚 17 | A0 — Channel address input 0 |
| 引脚 18 | A1 — Channel address input 1 |
| 引脚 19 | CS — Chip select (active low) |
| 引脚 20 | RD — Read strobe (active low) |
| 引脚 21 | WR — Write/conversion start (active low) |
| 引脚 22 | INT — Interrupt / end-of-conversion (active low) |
| 引脚 23 | NC — Not connected (per datasheet) |
| 引脚 24 | NC — Not connected (per datasheet) |
典型应用
MAX154AEWG 适用于 6 应用s: Multi-Channel Data Acquisition Systems, Process Control and Industrial Monitoring, Portable Battery-Powered Instruments, Sensor Array Multiplexing and Signal Conditioning, Digital Panel Meter and Display Front-Ends, Embedded Control and Microcontroller Interface Boards.
Multi-Channel Data Acquisition Systems
The MAX154AEWG's 4 single-ended analog inputs and 2.5 us conversion time suit it to multi-channel data acquisition front-ends where several sensors must be sampled sequentially by a single ADC. With its integrated 2.5 V reference and SAR architecture, the part delivers 8-bit accuracy at up to ~400 kSPS aggregate throughput, eliminating external MUX and reference components. Place 0.1 uF decoupling on VDD close to the IC and route analog/digital grounds separately. Compared to discrete ADC plus external reference designs, the MAX154 reduces BOM count and PCB area while preserving upgrade path to the pin-compatible MAX158 (8 channels).
推荐
Process Control and Industrial Monitoring
The MAX154AEWG's -40 C to +85 C industrial temperature rating and +5 V single-supply operation suit it to process-control front-ends monitoring temperature, pressure, and flow sensor outputs. The integrated 2.5 V bandgap reference simplifies calibration by anchoring absolute readings to an on-chip source, while the 4-channel input handles multiple sensor taps from a single ADC. Its parallel 8-bit interface connects directly to legacy 8051 and PIC microcontrollers without glue logic. In distributed control nodes, this ADC trades 12-bit precision for lower cost and simpler firmware, fitting tightly-bounded measurement tasks.
推荐
Portable Battery-Powered Instruments
The MAX154AEWG's single +5 V supply, CMOS low-power design, and integrated 2.5 V reference suit portable handheld instruments such as digital multimeters, environmental loggers, and medical point-of-care devices. Drawing only a few mW during conversion, it extends battery life while still providing 8-bit resolution adequate for sensor readouts and human-readable displays. The 4-channel input accepts multiple sensors (temperature, humidity, pressure) without external multiplexing. Compared to higher-resolution ADCs, the MAX154's modest 8-bit quantization matches the dynamic range needed for many consumer-grade measurements while minimizing bill of materials.
推荐
Sensor Array Multiplexing and Signal Conditioning
The MAX154AEWG's built-in 4-to-1 input multiplexer simplifies sensor array designs by eliminating external analog switches when reading multiple transducers through a single ADC. Combined with the integrated 2.5 V reference, it provides a complete ratiometric signal chain for bridge sensors, thermistors, and potentiometric dividers. The SAR architecture settles in 2.5 us per channel, providing adequate settling time for most sensor bandwidths. Engineers pairing it with strain gauges or RTD bridges benefit from the synchronous sampling capability and predictable aperture time, ensuring repeatable readings across the 4-channel scan sequence.
推荐
Digital Panel Meter and Display Front-Ends
The MAX154AEWG's parallel 8-bit output bus directly drives LED segment drivers, LCD controllers, and 7-segment display decoder logic, making it well suited to digital panel meter front-ends and process-display readouts. The 2.5 us conversion speed easily exceeds the human-eye update rate for typical panel meters, while the integrated reference simplifies calibration to absolute voltage units. Four input channels allow simultaneous monitoring of multiple process variables in a single display instrument. This ADC fits cost-sensitive industrial HMI applications where 8-bit resolution is sufficient for operator-level visualization and trend display.
推荐
Embedded Control and Microcontroller Interface Boards
The MAX154AEWG's standard CS/RD/WR parallel interface makes it an easy peripheral for legacy 8-bit microcontrollers in embedded control designs. Reading 4 analog inputs requires only three GPIO pins (CS, RD, WR plus interrupt), freeing microcontroller resources for digital I/O and communication tasks. The 2.5 us conversion time matches instruction cycles of slower MCUs, allowing polling without DMA. With its industrial temperature grade, the MAX154 suits automotive under-hood modules, HVAC controllers, and appliance boards where 8-bit precision is acceptable. The 24-SOIC package is hand-solderable for prototypes and small-batch production runs.
推荐
推荐产品汇总
工程参考数据： MAX154AEWG ——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 | MAX154AEWG+ | MAX154BEWG+ | MAX154BCWG+ | MAX158 |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 24-SOIC (Wide) | 24-SOIC (Wide) - same | 24-SOIC (Wide) - same | 24-SOIC (Wide) - same | 24-SOIC (Wide) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Input Channels | 4 | 4 | 4 | 4 | 8 (pin-compatible upgrade) |
| Conversion Time | 2.5 us | 2.5 us | 2.5 us | 2.5 us | 2.5 us |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Temperature Grade | Industrial (-40 C to +85 C) | Industrial (-40 C to +85 C) | Commercial (0 C to +70 C) | Commercial (0 C to +70 C) | Industrial/Commercial variants |
| RoHS Compliance | No (original), + variant RoHS | Yes (RoHS-compliant) | Yes (RoHS-compliant) | Yes (RoHS-compliant) | Yes (RoHS variants available) |
关键差异点
- Integrated 2.5 V bandgap reference （对比 MAX154AEWG+)
- Industrial temperature grade (-40 C to +85 C) （对比 MAX154BEWG+)
- Pin-compatible upgrade path to MAX158 （对比 MAX158 (8-channel variant))
设计说明
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VDD pin (pin 6), ideally within 3 mm. According to the Maxim Integrated datasheet, noisy VDD rails directly degrade ADC linearity and increase conversion noise. Add a 10 uF bulk tantalum or ceramic capacitor near the IC if the VDD trace is longer than 25 mm, and keep VDD separate from high-current digital supply paths.
Maintain separate analog and digital ground planes joined at a single point under the IC's AGND/DGND pins. According to the Maxim Integrated datasheet, mixing analog and digital return currents on the same trace couples digital switching noise into the SAR comparator, reducing effective resolution. Route analog input traces away from digital bus traces, and place the REF pin bypass (typically 4.7 uF tantalum in parallel with 0.1 uF ceramic) close to pin 8.
Keep analog input traces short and guarded by a ground trace to minimize capacitive coupling from adjacent digital signals. According to the Maxim Integrated datasheet, the input capacitance is small but sampling transients during track mode can corrupt the reading if source impedance exceeds the recommended 500 ohm maximum. Add a small RC filter (10 ohm + 100 pF) at each AIN pin for noisy sensor environments, and avoid long unshielded cables connecting sensors directly to AIN inputs.
Do not apply analog inputs outside the 0 V to VREF range or above VDD, as latch-up can result. According to the Maxim Integrated datasheet, the SAR architecture holds the input sample on an internal capacitor for the full conversion; high-impedance sources or excessive source resistance degrade the held voltage and cause conversion errors. If the analog signal is unipolar but spans a small range, scale it to use the full 0-VREF swing for maximum 8-bit resolution utilization.
合规信息
MAX154AEWG (without + suffix) is the original lead-finished variant; for RoHS-compliant builds, choose the MAX154AEWG+ variant. Reach and conflict minerals compliance per Maxim Integrated product declaration.
