MAX181BCPL - 12-Bit 8-Ch 100kSPS Data Acquisition | Maxim
料号： MAX181BCPL ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.2 | $252.00 |
| 100 | $21.75 | $2,175.00 |
| 500 | $18.4 | $9,200.00 |
| 1,000 | $15.95 | $15,950.00 |
MAX181BCPL 概述
A data-acquisition IC, often abbreviated DAS or DAQ, is a mixed-signal component that converts multiple real-world analog signals into a digital format that a microcontroller, DSP, or processor can interpret. Within the broader signal-chain hierarchy, the MAX181 sits between front-end sensors/transducers (which produce analog voltages or currents) and a host processor, belonging to the same product family as monolithic ADCs, mixed-signal front-ends, and DAS ICs that combine a MUX, ADC, and reference. Designers choose a fully integrated DAS when they need a small BOM and deterministic timing rather than a discrete mux + external ADC chain.
Key differentiating specifications include 100 kSPS throughput, 12-bit resolution with ±1 LSB linearity (max), a track/hold amplifier with sub-microsecond acquisition time, ±5 V input range on selected channels, and a parallel microprocessor interface. The MAX181BCPL operates from ±5 V supplies and supports bipolar input ranges by software configuration, removing the need for external signal conditioning on industrial-level signals.
Architecturally, the MAX181 uses a switched-capacitor charge-redistribution SAR core with an internal precision reference, an 8-input analog MUX with break-before-make switching, and an internal clock. The integrated design eliminates most timing skew between channels and removes the layout burden of routing high-frequency analog tracks between a separate MUX and ADC.
Typical applications include industrial process-control front ends, multichannel data loggers, portable instrumentation, and embedded analog I/O modules for PLCs. The wide input range, parallel interface, and through-hole PDIP package make it especially attractive for legacy retrofits and for evaluation/prototyping boards where socketed parts simplify rework.
When designing with the MAX181BCPL, ensure adequate decoupling on both AVDD and DVDD rails and verify that the input signal source impedance is below the datasheet's recommended maximum to maintain 12-bit accuracy. The through-hole PDIP footprint also simplifies hand-soldered prototypes and field replacements.
This page synthesizes distributor pricing for MAX181BCPL, drop-in PDIP-40 alternatives from the same Maxim MAX181 family, and design notes not collected in a single place elsewhere - giving procurement, design, and component-engineering teams a single reference for evaluating the part.
直接替换替代料： MAX181BCPL ——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： MAX181BCPL （相同外形与封装尺寸） ——差异在于 Package, Resolution, Input Type, Mounting Type, Operating Temperature Range.
快速对比工具——选择替代料号进行并排对比：
MAX181BCPL+
✅ 直接替换📋 参考替代料（不在目录中）
MAX181ACPL
✅ 直接替换📋 参考替代料（不在目录中）
MAX181ACPL+
✅ 直接替换📋 参考替代料（不在目录中）
MAX181CCPL+
✅ 直接替换📋 参考替代料（不在目录中）
MAX181AEPL
✅ 直接替换✓ 有现货
$17.2 / 个
查看数据手册 →MAX181CCPL
✅ 直接替换✓ 有现货
$5.95 / 个
查看数据手册 →MAX181BCPL 最大额定值与电气特性
| 功能 | Complete 8-Channel 12-Bit Data-Acquisition System |
| ADC Architecture | Successive Approximation (SAR) |
| 分辨率 | 12 bit |
| Number of Channels | 8 |
| 采样率 | 100 kSPS |
| Input Type | Single-Ended / Bipolar (software configurable) |
| 电源电压 | ±5 V (analog), +5 V (digital) |
| 接口 | Parallel (microprocessor-compatible) |
| Integral Linearity (INL) | ±1 LSB (max) |
| Analog Input Range | ±5 V (bipolar mode) |
| 封装 | 40-pin PDIP |
| Terminal Form | Through-Hole |
| Package Code | DIP |
| Operating Temperature Grade | Commercial (0C to +70C) |
| Package Shape | Rectangular |
| No. of Terminals | 40 |
MAX181BCPL 引脚配置
| 引脚 1 | CH0 — Analog input channel 0 |
| 引脚 2 | CH1 — Analog input channel 1 |
| 引脚 3 | CH2 — Analog input channel 2 |
| 引脚 4 | CH3 — Analog input channel 3 |
| 引脚 5 | CH4 — Analog input channel 4 |
| 引脚 6 | CH5 — Analog input channel 5 |
| 引脚 7 | CH6 — Analog input channel 6 |
| 引脚 8 | CH7 — Analog input channel 7 |
| 引脚 9 | AGND — Analog ground |
| 引脚 10 | AVSS — Negative analog supply (-5 V) |
| 引脚 11 | AVDD — Positive analog supply (+5 V) |
| 引脚 12 | REF — Reference voltage input/output |
| 引脚 13 | REFADJ — Reference adjust |
| 引脚 14 | VDD — Digital supply (+5 V) |
| 引脚 15 | DGND — Digital ground |
| 引脚 16 | D0 — Data bit 0 (LSB) |
| 引脚 17 | D1 — Data bit 1 |
| 引脚 18 | D2 — Data bit 2 |
| 引脚 19 | D3 — Data bit 3 |
| 引脚 20 | D4 — Data bit 4 |
| 引脚 21 | D5 — Data bit 5 |
| 引脚 22 | D6 — Data bit 6 |
| 引脚 23 | D7 — Data bit 7 |
| 引脚 24 | D8 — Data bit 8 |
| 引脚 25 | D9 — Data bit 9 |
| 引脚 26 | D10 — Data bit 10 |
| 引脚 27 | D11 — Data bit 11 (MSB) |
| 引脚 28 | HBEN — High-byte enable |
| 引脚 29 | CS — Chip select (active low) |
| 引脚 30 | RD — Read strobe (active low) |
| 引脚 31 | WR — Write strobe (active low) |
| 引脚 32 | MODE — Mode select |
| 引脚 33 | INT — Interrupt / conversion complete |
| 引脚 34 | CLK — External clock input |
| 引脚 35 | RANGE — Input range select (unipolar/bipolar) |
| 引脚 36 | ACQ — Acquire / track-hold control |
| 引脚 37 | NC — Not connected |
| 引脚 38 | NC — Not connected |
| 引脚 39 | NC — Not connected |
| 引脚 40 | NC — Not connected |
典型应用
MAX181BCPL 适用于 6 应用s: Industrial Process Control Front End, Multichannel Data Logger, Portable Instrumentation, Embedded Analog I/O Module, Legacy Equipment Retrofit, Evaluation and Prototyping Boards.
Industrial Process Control Front End
The MAX181BCPL fits industrial process-control front ends because its 8 single-ended input channels match the typical transducer count per PLC card (8 sensors or 4-7 analog process variables plus a calibration channel). With 12-bit resolution and ±1 LSB linearity (max) the device delivers roughly 0.024% full-scale accuracy, suitable for 4-20 mA-derived signals and 0-10 V actuator feedback after signal conditioning. Placed between the analog input terminals and the host PLC CPU, the MAX181's parallel interface allows direct bus attachment with no glue logic, and its ±5 V supplies tolerate the ±12 V industrial rails after resistive scaling. Unlike a discrete MUX + ADC pair, the integrated SAR + track/hold keeps channel-to-channel skew below one conversion cycle, which is critical for closed-loop control stability.
推荐
Multichannel Data Logger
The MAX181BCPL is well-suited to multichannel data loggers where many slow-changing analog signals (temperature, pressure, voltage, current) must be digitized and timestamped. Its 8 channels let one IC scan 8 sensors sequentially without an external MUX, and the 100 kSPS throughput is more than adequate when the bottleneck is the logger's sample-and-store rate. The internal track/hold settles in well under 1 microsecond, so consecutive channel conversions stay independent even with high source impedance (kΩ range). Compared with a discrete ADC + external MUX, the MAX181 eliminates the multiplexer break-before-make timing concern and the layout burden of routing 8 analog traces alongside a digital bus.
推荐
Portable Instrumentation
The MAX181BCPL's integrated single-IC form factor makes it attractive for portable instrumentation where PCB area and BOM count matter. By replacing a 4-chip solution (MUX + T/H + ADC + reference) with one package, designers save roughly 60-70% of the analog-section board area and shrink the layout's analog/digital boundary. The 12-bit/100 kSPS specification is sufficient for handheld multimeters, bench DMMs, and battery-powered field analyzers measuring DC and low-frequency AC parameters. The 40-pin PDIP through-hole package is also socket-friendly, supporting field-swap repairs in deployed handheld units.
推荐
Embedded Analog I/O Module
The MAX181BCPL serves embedded analog I/O modules (analog input slices for PLCs, distributed control nodes, and remote telemetry units) where 8 channels per node is the typical I/O density. Its parallel microprocessor-compatible interface allows direct connection to 8051, 68HC11, and similar legacy microcontrollers without glue logic, and the 100 kSPS throughput lets one module scan all 8 channels inside a 1 ms control period. The ±5 V input range and bipolar capability let the same hardware handle both 0-5 V unipolar sensors and ±5 V bipolar signals, reducing SKU count across product families.
推荐
Legacy Equipment Retrofit
The MAX181BCPL remains a critical drop-in for legacy equipment retrofits where original Maxim DASICs are failing or unobtainable. Many 1990s-era industrial controllers, test stations, and avionics subsystems specified the MAX181 family, and the 40-pin PDIP footprint is socket-compatible with original Through-Hole landing patterns. The part's NRND status makes secondary-market sourcing the practical path; authorized-stock MAX181BCPL+ or grade variants (A/C) extend the equipment's service life by 5-10 years without PCB rework.
推荐
Evaluation and Prototyping Boards
The MAX181BCPL is widely used in evaluation and prototyping boards, university lab courses, and engineering training kits because the 40-pin PDIP is breadboard-friendly and the parallel interface is straightforward to drive from an FPGA evaluation board or microcontroller dev kit. Designers can validate an 8-channel data-acquisition chain with a single IC and a few passive components, accelerating firmware development and algorithm testing before committing to a surface-mount variant for production.
推荐
推荐产品汇总
工程参考数据： MAX181BCPL ——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 | MAX181BCPL+ | MAX181ACPL | MAX181ACPL+ | MAX181CCPL+ | MAX181AEPL | MAX181CCPL |
|---|---|---|---|---|---|---|---|
| Package | PDIP-40 | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) | PDIP-40 (same) |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Channels | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Sampling Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS |
| INL (max) | ±1 LSB (B-grade) | ±1 LSB (B-grade) | Tighter A-grade | Tighter A-grade + RoHS | C-grade spec + RoHS | Tighter A-grade + extended temp | C-grade spec |
| Lead-Free / RoHS | No (lead-finish) | Yes (lead-free + RoHS) | No (lead-finish) | Yes (lead-free + RoHS) | Yes (lead-free + RoHS) | No (lead-finish) | No (lead-finish) |
| Temperature Grade | Commercial 0 to +70 C | Commercial 0 to +70 C | Commercial 0 to +70 C | Commercial 0 to +70 C | Commercial 0 to +70 C | Extended (A-grade E) | Commercial 0 to +70 C |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
关键差异点
- Maxim MAX181 family drop-in with same PDIP-40 footprint and 12-bit 100 kSPS SAR architecture （对比 MAX181ACPL)
- Lead-free RoHS drop-in variant without redesign （对比 MAX181BCPL+)
- Extended-temperature A-grade variant in same footprint （对比 MAX181AEPL)
设计说明
The MAX181BCPL requires three supplies: +5 V analog (AVDD), -5 V analog (AVSS), and +5 V digital (VDD). Decouple each supply pin with a 10 µF tantalum or electrolytic bulk capacitor plus a 0.1 µF ceramic capacitor placed within 5 mm of the pin. Separate analog and digital ground planes joined at a single point under the IC prevent digital switching noise from coupling into the analog front-end and degrading 12-bit accuracy.
Route the 8 analog input traces as a guarded bus with ground-side shielding, and keep them away from the parallel data bus and clock traces. Use a star-ground topology where the MAX181's AGND pin ties to the system analog ground at one point. Avoid running analog traces parallel to digital lines for more than a few millimetres; cross them at 90 degrees to minimize coupling.
Source impedance above 5 kΩ on the analog inputs degrades acquisition-time accuracy and increases channel-to-channel crosstalk at 100 kSPS. Insert a low-impedance buffer (op-amp follower such as the MAX4162 or similar) per channel if your sensor network exceeds this source impedance. Estimated settling-time degradation: a 10 kΩ source adds roughly 0.5 LSB at 100 kSPS for a 25 pF internal sample capacitor.
Do not leave any analog input floating when unconnected - tie unused CH0..CH7 inputs to AGND through a 10 kΩ resistor to prevent the input multiplexer from picking up ambient noise and producing spurious conversions. Also verify the RANGE pin (unipolar/bipolar) is tied correctly before issuing conversions; an open RANGE pin defaults the device to an undefined input range and yields code errors.
Estimated: at +5 V/100 kSPS the MAX181BCPL draws roughly 15 mA from AVDD plus 5 mA from VDD (CDIP commercial grade), so total power dissipation is ~100 mW. In the 40-pin PDIP the theta_JA is around 60 C/W, giving a junction-rise of 6 C above ambient - well below the 150 C maximum, so no heatsink is required for typical industrial control and instrumentation applications.
合规信息
MAX181BCPL (without '+' suffix) is the original lead-finished commercial part. The MAX181BCPL+ variant is lead-free / RoHS compliant. AEC-Q100 not applicable - this is a commercial-grade data-acquisition IC. Reach, halogen-free, and conflict-mineral status were not stated in the verified data and are marked unknown.
