MAX181AEPL - 12-Bit 8-Ch 100ksps Data Acquisition IC | Maxim
料号： MAX181AEPL ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.75 | $257.50 |
| 100 | $22.4 | $2,240.00 |
| 500 | $19.95 | $9,975.00 |
| 1,000 | $17.2 | $17,200.00 |
MAX181AEPL 概述
A Data Acquisition System (DAS) of this type combines an analog front end (multiplexer + T/H + reference) with a successive-approximation ADC and a digital interface. In the broader system taxonomy, a DAS sits below a data logger or DAQ module and above a discrete SAR ADC; it sits inside the larger category of mixed-signal data converter ICs, which themselves fall under signal-chain and data-acquisition semiconductors. By integrating the multiplexer and reference, the MAX181AEPL removes the need to specify, lay out, and calibrate those external sub-blocks.
Key features include eight analog input channels (software-configurable single-ended or differential), a 100 ksps throughput rate, ±5 V input range capability (with ±12 V or ±15 V supplies), successive-approximation conversion, software-selectable unipolar or bipolar operation, and a low-power +5 V supply requirement. The internal reference and T/H deliver the bandwidth and accuracy needed to digitize multiplexed signals without inter-channel settling loss.
Technically, the MAX181AEPL uses a charge-balancing successive-approximation architecture with an auto-calibrating internal DAC and an input T/H that supports settling to 12-bit accuracy at the full 100 ksps rate. The internal buried-zener reference provides low drift over temperature, eliminating the need for an external reference in most applications. The microprocessor interface supports both 8-bit-wide and 12-bit-wide bus reads, plus standard Read/Convert signals for compatibility with common µP families.
Typical applications include industrial process-control front ends, multi-channel instrumentation data loggers, multiplexed sensor signal conditioning, automatic test equipment (ATE) scan digitizers, and embedded 12-bit measurement subsystems. The 8-channel count maps directly to typical sensor-per-channel counts (4-8 analog sensors per board).
When designing with the MAX181AEPL, pay attention to analog-input common-mode and overvoltage protection at the multiplexer. The internal reference, while low-drift, requires a properly decoupled supply rail; place 10 µF tantalum and 0.1 µF ceramic bypass capacitors close to the supply pins. For best 12-bit performance in multiplexed mode, include a T/H settling delay before conversion start.
This page consolidates distributor stock and pricing, drop-in MAX181-family alternatives, and practical layout/calibration notes that go beyond what the datasheet alone provides.
直接替换替代料： MAX181AEPL ——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： MAX181AEPL （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：
MAX181AEPL+
✅ 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）
MAX181CEPL+
✅ 直接替换📋 参考替代料（不在目录中）
MAX181CCPL
✅ 直接替换✓ 有现货
$5.95 / 个
查看数据手册 →MAX180AEPP
✅ 直接替换📋 参考替代料（不在目录中）
MAX181AEPL 最大额定值与电气特性
| Product Type | Data Acquisition System (DAS) / SAR ADC |
| 分辨率 | 12 bit |
| Number of Analog Input Channels | 8 |
| Channel Configuration | Single-ended or differential (software-selectable) |
| Conversion Architecture | Successive Approximation with Track-and-Hold |
| Throughput (max) | 100 ksps |
| 输入电压范围 | 0 to +5 V (unipolar) / ±5 V (bipolar) at +5 V supply |
| Analog Supply Voltage | +5 V (analog) and +12 V to +15 V or ±12 V to ±15 V |
| Digital Supply Voltage | +5 V |
| Internal Reference | Yes, low-drift buried zener reference |
| Microprocessor Interface | 8-/12-bit µP-compatible parallel bus |
| 工作温度范围 | 0 C to +70 C (E suffix, industrial) |
| 封装 | 40-pin PDIP (PL) |
| 安装类型 | Through-Hole (DIP) |
| 引脚数量 | 40 |
MAX181AEPL 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 | AV+ — Analog positive supply (+5 V or +12 V to +15 V) |
| 引脚 11 | AV-/VSS — Analog negative supply (0 V or -12 V to -15 V) |
| 引脚 12 | REF — Internal reference output |
| 引脚 13 | REFADJ — Reference adjust (trim) |
| 引脚 14 | AVDD — Analog +5 V supply |
| 引脚 15 | DVDD — Digital +5 V supply |
| 引脚 16 | DGND — Digital ground |
| 引脚 17 | D0 — Data bit 0 (LSB) |
| 引脚 18 | D1 — Data bit 1 |
| 引脚 19 | D2 — Data bit 2 |
| 引脚 20 | D3 — Data bit 3 |
| 引脚 21 | D4 — Data bit 4 |
| 引脚 22 | D5 — Data bit 5 |
| 引脚 23 | D6 — Data bit 6 |
| 引脚 24 | D7 — Data bit 7 |
| 引脚 25 | D8 — Data bit 8 |
| 引脚 26 | D9 — Data bit 9 |
| 引脚 27 | D10 — Data bit 10 |
| 引脚 28 | D11 — Data bit 11 (MSB) |
| 引脚 29 | CS — Chip select (active low) |
| 引脚 30 | RD — Read strobe (active low) |
| 引脚 31 | WR — Write / convert start |
| 引脚 32 | MODE — 8-bit / 12-bit bus mode select |
| 引脚 33 | INT — Conversion-complete interrupt |
| 引脚 34 | CLK — External clock input (or internal RC select) |
| 引脚 35 | UNI/BIP — Unipolar / bipolar input range select |
| 引脚 36 | SGL/DIF — Single-ended / differential input select |
| 引脚 37 | NC — Not connected (per datasheet) |
| 引脚 38 | NC — Not connected (per datasheet) |
| 引脚 39 | NC — Not connected (per datasheet) |
| 引脚 40 | NC — Not connected (per datasheet) |
典型应用
MAX181AEPL 适用于 6 应用s: Industrial Process Control Front End, Multichannel Data Logger, Automatic Test Equipment (ATE) Scan Input, Multiplexed Sensor Signal Conditioning, Embedded 12-bit Measurement Subsystem, Legacy Board Repair and Replacement.
Industrial Process Control Front End
The MAX181AEPL fits industrial process-control front ends because its 12-bit resolution over an 8-channel multiplexer maps directly to the 4-8 analog sensor count typical of PLC analog input cards. With software-selectable unipolar 0-5 V or bipolar ±5 V, ±12 V, ±15 V ranges, the device accepts outputs directly from RTD conditioners, 4-20 mA loop shunts, thermocouple amplifiers, and pressure transducers. The on-chip Track-and-Hold and buried-zener reference remove inter-channel settling errors in multiplexed scanning at the full 100 ksps rate, while the 8/12-bit µP interface glues directly to 8051, 68HC11, and similar industrial controller buses used in legacy PLC and SCADA hardware.
推荐
Multichannel Data Logger
For portable and bench-top multichannel data loggers, the MAX181AEPL delivers 12-bit accuracy at 100 ksps across eight channels in a single IC, which dramatically shrinks the BOM compared with a discrete multiplexer plus SAR ADC solution. The on-chip reference eliminates an extra component and calibration step, while the integrated T/H preserves 12-bit settling at the full conversion rate - critical for capturing fast transients from temperature, strain, and vibration sensors. The 40-pin PDIP package is straightforward to hand-prototype, and the parallel µP bus simplifies integration with common microcontroller data-logger platforms. Power consumption is low enough for battery-powered logging when the converter duty-cycled between conversions.
推荐
Automatic Test Equipment (ATE) Scan Input
In ATE scan digitizers and rack-and-stack instrumentation, the MAX181AEPL provides the per-channel throughput required to multiplex many analog test points into a single 12-bit digitizer. The 100 ksps rate, combined with software-selectable single-ended or differential input configurations, lets one IC scan 8 DUT-side measurement nodes without an external instrumentation amplifier - useful for board-test fixtures where board area and BOM count matter. The on-chip reference and T/H ensure repeatable absolute readings between channels, which improves measurement correlation across test points. Designers can cascade multiple MAX181-family devices on a single µP bus to scale channel count further.
推荐
Multiplexed Sensor Signal Conditioning
The MAX181AEPL is well suited to multiplexed sensor signal conditioning where multiple analog sensors - thermocouples, load cells, flow meters, photodiodes - share one ADC. Software-configurable unipolar/bipolar and single-ended/differential input modes allow direct connection to bridge sensors in differential mode and single-ended transducers in unipolar mode through the same device. The internal low-drift zener reference stabilizes gain across temperature, important when sensor accuracy must be maintained over hours of operation. The 8-channel count matches common sensor-per-board designs, and the integrated T/H guarantees that rapid multiplexed scans preserve 12-bit conversion accuracy.
推荐
Embedded 12-bit Measurement Subsystem
Embedded 12-bit measurement subsystems built around legacy 8-bit microcontrollers (8051, 68HC11, Z80) benefit from the MAX181AEPL because its parallel 8/12-bit µP interface avoids the overhead of serial ADC protocols. The 8-channel input multiplexer maps to typical sensor count in industrial embedded designs, and the 100 ksps rate exceeds the throughput requirement of most slow-control loops. The integrated reference, T/H, and ADC remove three external components from the BOM, shrinking PCB area in space-constrained embedded modules. With software-configurable input ranges, one IC handles both 0-5 V digital-board rails and ±10 V or ±15 V industrial transducer outputs.
推荐
Legacy Board Repair and Replacement
The MAX181AEPL is primarily in demand today as a legacy board-repair and replacement part for installed-base industrial, medical, and test equipment where the original DAS IC has failed and full board redesign is impractical. Because it shares the 40-pin PDIP footprint with the rest of the MAX181 family (MAX181ACPL, MAX181CEPL+, MAX181CCPL), maintenance technicians can substitute parts within the family based on stock availability. The integrated architecture - multiplexer, T/H, reference, ADC, and µP interface - in a single through-hole IC means a board swap restores full 12-bit, 8-channel data acquisition without re-engineering the analog front end. For high-volume repair needs, sourcing through Maxim authorized distributors and obsolete-stock specialists is the standard procurement path.
推荐
推荐产品汇总
工程参考数据： MAX181AEPL ——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 | MAX181AEPL+ | MAX181ACPL | MAX181ACPL+ | MAX181CEPL+ | MAX181CCPL | MAX180AEPP |
|---|---|---|---|---|---|---|---|
| Package | PDIP-40 (through-hole) | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same | PDIP-28 - different package |
| 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 |
| Analog Input Channels | 8 | 8 | 8 | 8 | 8 | 8 | 6 |
| Throughput | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps |
| Temperature Grade | Industrial (0 to +70 C, 'E' suffix) | Industrial 'E' (0 to +70 C) | Commercial 'C' (0 to +70 C) | Commercial 'C' (0 to +70 C) | Commercial 'C' (0 to +70 C) | Commercial 'C' (0 to +70 C) | Industrial 'E' (0 to +70 C) |
| Accuracy Tier | Standard (E suffix) | Standard | Higher accuracy ('A' grade) | Higher accuracy ('A' grade) | Standard | Standard | Standard |
| Lead-Free / RoHS | Unknown (non-'+' suffix) | Yes ('+' = lead-free RoHS) | No (non-'+' suffix) | Yes ('+' = lead-free RoHS) | Yes ('+' = lead-free RoHS) | No (non-'+' suffix) | No (non-'+' suffix) |
| Pin-Out Compatibility vs MAX181AEPL | - | Drop-in (identical die, same PDIP-40) | Drop-in (same PDIP-40, same 8-ch architecture) | Drop-in (same PDIP-40, same 8-ch architecture) | Drop-in (same PDIP-40, same 8-ch architecture) | Drop-in (same PDIP-40, same 8-ch architecture) | Not drop-in (PDIP-28, 6-channel) |
关键差异点
- 8 analog input channels in a single IC （对比 MAX180AEPP)
- Higher-accuracy 'A' grade available in same package （对比 MAX181AEPL+)
- Industrial temperature grade option （对比 MAX181CCPL)
- On-chip reference and Track-and-Hold （对比 Discrete 12-bit SAR ADC + external MUX + external reference)
设计说明
The MAX181AEPL needs both an analog +5 V rail and a digital +5 V rail; some variants also accept ±12 V or ±15 V analog supplies for extended bipolar input ranges. Place a 10 µF tantalum in parallel with a 0.1 µF ceramic bypass capacitor directly on each supply pin (AVDD, DVDD, AV+/VSS) within 5 mm of the IC. This decoupling is critical because the buried-zener reference and T/H settle to 12-bit accuracy only when the analog rail is quiet; switching-noise riding on AVDD directly degrades INL.
Estimated: when multiplexing eight channels at 100 ksps, the input Track-and-Hold requires approximately 1-2 µs of acquisition time to settle to 12-bit accuracy after a full-scale channel-to-channel step. Software drivers should insert this T/H settling delay between channel selection (writing the MUX address) and the start of conversion (rising edge of WR or INT-based auto-zero). Skipping this delay is the most common cause of channel-to-channel crosstalk in multiplexed 12-bit systems.
Do not let analog input voltages exceed the analog supply rails, especially in unipolar mode where CH0-CH7 must remain within 0 to AV+; the multiplexer does not include input clamps. For ±12 V or ±15 V industrial signals, verify AV+/VSS supplies are configured to those rails (not +5 V) before applying input power, otherwise the multiplexer ESD structures will forward-bias and the part will be damaged. Add external TVS or series resistors on each channel if overvoltage transients are possible.
Keep analog grounds (AGND) and digital grounds (DGND) tied at a single star point near the IC, with separate analog and digital ground returns converging only at the supply-side bulk capacitor. Route digital data bus traces (D0-D11, CS, RD, WR, INT) away from analog input traces (CH0-CH7, REF) to avoid digital noise coupling into the analog front end; place the AGND/DGND split underneath the IC body so the package pin-out naturally separates noisy digital and quiet analog pin groups.
The MAX181AEPL in 40-pin PDIP dissipates well under 500 mW even at 100 ksps continuous conversion across all 8 channels, so thermal management is generally not a limiting design consideration. Designers should still confirm that the operating ambient temperature is within the 0 C to +70 C industrial (E-grade) range, especially in enclosed industrial cabinets where ambient can approach 60-70 C without active airflow.
合规信息
RoHS / REACH / lead-free status not stated in the verified distributor pages. The '+' suffix variants (MAX181AEPL+, MAX181ACPL+, MAX181CEPL+) are typically lead-free / RoHS-compliant per Maxim/ADI convention; non-'+' variants (MAX181AEPL, MAX181ACPL, MAX181CCPL, MAX180AEPP) were generally released before lead-free mandates and may not be RoHS-compliant. AEC-Q100 is not applicable - this is a commercial/industrial through-hole data-acquisition IC, not an automotive-qualified part.
