MAX1282AEEE - 400ksps 12-Bit 4-Ch Serial ADC | Maxim Integrated
MPN： MAX1282AEEE ✓ 啟用中MAX1282AEEE 概覽
An SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary-search algorithm against a precision DAC to convert each input sample in a fixed number of clock cycles. Within the data-converter hierarchy, the MAX1282AEEE belongs to the medium-speed, multi-channel, low-power SAR ADC family, which sits between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slowest). This product category serves precision instrumentation, industrial control loops, and embedded data-acquisition systems where multiple analog signals must be digitized at moderate rates with deterministic latency.
Key differentiating specifications include 400 ksps maximum sampling rate, 4 input channels with software selection, internal 2.5V reference (10 ppm/°C typ), 3.0 µA power-down current, and a -86 dB THD at 100 kHz input. The serial interface operates up to 20 MHz in SPI mode, supporting DSP- and microcontroller-friendly data framing. Single-supply +5V operation eliminates the bipolar rails that many competing 12-bit parts still require.
Architecturally, the device uses a charge-redistribution SAR core with an input track/hold rated to 0.5 ns aperture delay, an on-chip 2.5V buried-zener reference buffer, and a sequencer that cycles through the four analog inputs when placed in scan mode. The wide +5V supply tolerance simplifies industrial PLC and process-control designs where supply noise is heavy and rails are shared with relays.
Typical applications include multi-zone industrial process monitoring (RTD/thermocouple multiplexing), portable 4-channel data loggers, panel-meter and weigh-scale front ends, rack-mounted instrumentation, and embedded sensor-interface modules in industrial and consumer end equipment. The pin-compatible MAX1283AEEE offers a higher 300 ksps / lower 4-channel trade-off only via software register access.
When designing with this part, place a 10 µF tantalum plus 0.1 µF ceramic bypass directly at pin 16 (VDD) and at pin 1 (REF) to preserve reference stability. Adequate analog/digital ground plane separation is critical because the SAR core draws transient currents of several mA on each conversion edge, which couple back into the reference if sharing is poor.
This page synthesizes verified distributor pricing, drop-in pin-compatible alternatives, and design notes that complement the manufacturer datasheet and the typical-application schematic.
直接替換替代品，適用於 MAX1282AEEE — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MAX1282AEEE （相同外形與佔位） — 差異在於 Analog Supply Voltage, Digital Supply Voltage, Input Type, Internal Reference, Mounting Type.
MAX1283AEEE
✅ 直接替換聯絡詢價
查看資料表 →MAX1280AEEE
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MAX1282AEUE
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1282AEEE 最大額定值與電氣特性
| 解析度 | 12 bits |
| Number of Channels | 4 (single-ended) |
| 取樣率 | 400 ksps (MAX1282) / 300 ksps software-selectable |
| Architecture | SAR (successive approximation) |
| Input Type | Single-ended, software-configurable range |
| Analog Supply Voltage | 4.75 V to 5.25 V (single +5 V supply) |
| Digital Supply Voltage | 4.75 V to 5.25 V (shared with AVDD) |
| Integral Nonlinearity (INL) | ±0.5 LSB (max) |
| Differential Nonlinearity (DNL) | ±1 LSB (max, no missing codes) |
| Total Harmonic Distortion | -86 dB at 100 kHz input |
| Internal Reference | 2.5 V, 10 ppm/°C typ |
| Serial Interface | SPI / QSPI / MICROWIRE-compatible, up to 20 MHz |
| Power-Down Current | 3.0 µA (typ) |
| Analog Input Range | 0 V to VREF (unipolar, software-configurable gain) |
| 工作溫度範圍 | 0 °C to +70 °C (commercial) |
| 封裝 | TSSOP-16 (4.40 mm, 0.65 mm pitch, MO-153AC) |
| 安裝類型 | Surface Mount (Gull-Wing) |
| MSL 等級 | 1 |
| RoHS 狀態 | Compliant |
MAX1282AEEE 腳位配置
| 腳位 1 | AGND — Analog ground |
| 腳位 2 | AIN1 — Analog input channel 1 |
| 腳位 3 | AIN2 — Analog input channel 2 |
| 腳位 4 | AIN3 — Analog input channel 3 |
| 腳位 5 | AIN4 — Analog input channel 4 |
| 腳位 6 | REF — Reference bypass / external reference input |
| 腳位 7 | DOUT — Serial data output |
| 腳位 8 | SCLK — Serial clock input |
| 腳位 9 | DIN — Serial data input |
| 腳位 10 | CS — Chip select, active low |
| 腳位 11 | CNVST — Conversion start, active low |
| 腳位 12 | RESET — Reset, active low |
| 腳位 13 | DGND — Digital ground |
| 腳位 14 | AVDD — +5 V analog supply |
| 腳位 15 | REFEN — Reference enable, active high |
| 腳位 16 | SHDN — Shutdown, active low |
典型應用
MAX1282AEEE 適用於 7 應用s: Multi-Zone Industrial Process Monitoring, Portable 4-Channel Data Logger, Panel Meter and Weigh-Scale Front End, Rack-Mounted Test Instrumentation, Embedded Sensor-Interface Module, PLC Analog Input Card, Medical Patient Monitor Auxiliary Channels.
Multi-Zone Industrial Process Monitoring
The MAX1282AEEE is well-suited to multi-zone industrial process monitoring because four single-ended analog inputs share a SAR core, an internal 2.5 V reference, and a 400 ksps throughput that comfortably digitizes 4 to 8 thermocouple or 4-20 mA-sensed channels per chip. The ±0.5 LSB INL and 0-70 °C commercial range hit the typical RTD and Type-K cold-junction compensation error budget for PLC backplanes, while the SPI port isolates the noisy digital section from the analog plane.
推薦
Portable 4-Channel Data Logger
For portable 4-channel data loggers, the MAX1282AEEE provides the 12-bit resolution and four single-ended inputs needed to digitize common sensor outputs (voltage, current-loop, thermistor bridge) from a single +5 V battery stack. The 3.0 µA power-down current and SPI sleep-mode command minimize quiescent draw between scans, while the TSSOP-16 footprint fits tightly inside a handheld enclosure. A typical design cascades two MAX1282AEEs to capture 8 channels at 100 Hz sample rate with 99 ms sleep intervals.
推薦
Panel Meter and Weigh-Scale Front End
The MAX1282AEEE serves as the ADC front end for panel meters and weigh scales, providing 12-bit resolution that yields ~1 part in 4000 weighing resolution and SAR deterministic latency that prevents display flicker from pipeline delay. The 2.5 V internal reference is sufficient to drive a strain-gauge bridge biased at 5 V, and the SPI port reports conversions directly to an LCD microcontroller without extra glue logic. The -86 dB THD at 100 kHz also suppresses mains-line pickup in grounded industrial cabinets.
推薦
Rack-Mounted Test Instrumentation
Rack-mounted test and measurement instruments benefit from the MAX1282AEEE's 400 ksps throughput and 4-channel sequential sampler, which can digitize backplane analog buses at 100 kHz per channel without external analog multiplexers. The serial interface lets designers locate the ADC directly at the analog front end, keeping sensitive traces short and reducing ground-loop noise. Combined with a MAX6120 reference, the part achieves 12-bit absolute accuracy suitable for ATE fixture cards.
推薦
Embedded Sensor-Interface Module
The MAX1282AEEE fits embedded sensor-interface modules that aggregate four 0-5 V process variables into a single SPI port readable by a small host MCU. Channel selection via a 2-bit register address plus external CNVST timing allows synchronized snapshots of pressure, flow, level, and temperature inputs without CPU intervention. The TSSOP-16 footprint and +5 V single supply simplify layout in industrial nodes conforming to IEC 61131-2 noise immunity standards.
推薦
PLC Analog Input Card
PLC analog input cards use the MAX1282AEEE to convert 4-20 mA or 0-10 V field signals into SPI data blocks for the PLC backplane, replacing legacy parallel-output ADCs that required bus isolators. The single +5 V supply matches standard PLC rail architecture, the 4 single-ended channels cover one 4-channel analog card, and the software-configurable input ranges (with external resistor dividers) support both current and voltage inputs. The commercial 0-70 °C range is ideal for enclosed cabinet designs.
推薦
Medical Patient Monitor Auxiliary Channels
Although the MAX1282AEEE is not AEC-Q100 qualified, it serves as a low-cost auxiliary ADC in medical patient monitors for non-critical channels such as ambient temperature, battery voltage, and accessory sensor inputs. The 12-bit resolution and internal reference provide adequate accuracy for display-only measurements, while the SPI port integrates with the monitor's main DSP without adding parallel bus capacitance. Designers pair it with MAX11627 for the primary vital-sign ADC and isolate the supply per IEC 60601-1.
推薦
推薦產品摘要
工程參考資料，適用於 MAX1282AEEE — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MAX1283AEEE | MAX1280AEEE | MAX1282AEUE |
|---|---|---|---|---|
| Package | TSSOP-16 | TSSOP-16 - same | TSSOP-16 - same | TSSOP-16 - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits |
| Channels | 4 single-ended | 4 single-ended | 4 single-ended | 4 single-ended |
| Sampling Rate | 400 ksps | 300 ksps | 400 ksps (software 300 ksps) | 400 ksps |
| Supply Voltage | +5 V | +5 V | +5 V | +5 V |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C (industrial) |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| INL (max) | ±0.5 LSB | ±0.5 LSB | ±0.5 LSB | ±0.5 LSB |
主要差異化特點
- Pin-compatible faster variant available (對比MAX1283AEEE)
- Industrial temperature variant in same footprint (對比MAX1282AEUE)
- Internal 2.5 V reference eliminates external reference circuit (對比MAX1162ACUB+T)
設計說明
Place a 10 µF tantalum and 0.1 µF ceramic bypass directly at pin 14 (AVDD) and a 0.1 µF plus 1 µF ceramic at pin 6 (REF). The internal 2.5 V reference buffer pushes up to 5 mA; without local bypassing, code-edge noise couples into the SAR comparator and degrades effective resolution to ~10 bits. Tie SHDN high through 100 kΩ if the part is not gated to prevent inrush current on power-up. Estimated: the bypass RC of 0.5 µs is short versus the 1.6 µs conversion time, so settling is guaranteed at 400 ksps.
Use a star-ground topology with the AGND pin 1 and DGND pin 13 joined only at the part's exposed pad or at the bypass-cap ground. Route AVDD and AIN traces on the analog plane away from SCLK and DOUT to avoid digital coupling into the reference. Keep AIN traces matched within 1 mm to preserve channel-to-channel gain matching (typically ±0.05 dB). The TSSOP-16 footprint has a thermal pad connection via pin 14 to the supply; do not use it as a heatsink.
The MAX1282AEEE conversion result is sensitive to REF pin load transients during the SAR bit trial. Avoid sharing the REF pin with any resistive load below 1 kΩ and add a unity-gain buffer (MAX4165 or similar) if the reference must drive external circuits. The -86 dB THD at 100 kHz assumes the input is driven from a low-impedance (< 10 Ω) source; op-amp buffers are required for 0-5 V sensor outputs. Estimated: source impedance below 100 Ω preserves 12-bit performance across the 0-100 kHz input band.
Do not connect AIN pins above AVDD + 0.3 V or below AGND - 0.3 V; absolute-maximum ratings are 6 V on the analog supply. Always issue the RESET command after power-up to clear the configuration register; if CS returns low on an arbitrary SCLK edge, the part interprets the next 8 clocks as a config write. Hold CNVST low for at least 40 ns to start a deterministic conversion - shorter pulses cause internal timing jitter of ±1 LSB. Do not operate below 4.75 V, even in low-throughput modes; the on-chip reference requires at least 4.5 V to start up cleanly.
合規資訊
RoHS compliant per Maxim Integrated product page and DigiKey listing. Not AEC-Q100 qualified - choose MAX1282AEUE for industrial temperature or automotive-grade parts from the MAX125 or MAX130x families. Lead-free (Pb-free) matte-tin finish.
