MAX1270AENG - 12-Bit 8-Ch 110ksps SPI/QSPI ADC, +5V, DIP-24 | Maxim
MPN： MAX1270AENG ✓ 啟用中MAX1270AENG 概覽
What is a SAR ADC? A successive-approximation register analog-to-digital converter is a precision data-conversion architecture that performs one bit per clock cycle using an internal DAC and comparator to converge on the analog input voltage. SAR ADCs sit in the hierarchy Data Acquisition System (DAS) > ADC > data converter > mixed-signal IC, and are favored where low-latency, deterministic conversions and small footprint matter more than ultra-high sampling rates. The MAX1270 also integrates an 8-channel input MUX, track/hold, reference, and serial host interface into a single IC, eliminating external signal-conditioning glue for low-channel-count systems.
Key features include 12-bit resolution with 0.5 LSB linearity, software-selectable unipolar input ranges of 0 to VREF, 0 to VREF/2, bipolar ±VREF/2 and ±VREF (with VREF = 4.096 V internal or external), an internal 4.096 V reference (MAX1270A variant), ±17 V fault-protected analog inputs that survive transients beyond the supply rails, and a 2.5 MHz bandwidth track/hold. Throughput of 110 ksps at a 5 MHz SPI clock is paired with a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface and an internal or external serial clock source.
Architecture-wise the device combines an 8-to-1 input multiplexer, a fully differential capacitive-DAC-based SAR core, on-chip reference, and SPI logic in a single CMOS die. Power dissipation is held low at typically 6 mA (operating) and 10 µA (shutdown), simplifying thermal management even at 110 ksps continuous conversion. Hardware averaging and an external acquisition input simplify synchronization to system interrupts or timer events.
Typical applications include industrial process-control front-ends, multi-channel data loggers, battery-pack monitoring, programmable logic controller (PLC) analog input modules, and embedded sensor conditioning for instrumentation. Designers choose the MAX1270AENG for fault-tolerant analog inputs where field wiring may carry transients.
A practical design trade-off is selecting the correct input range for signal headroom versus resolution: ±VREF/2 maximizes dynamic range for bipolar sensors, while 0 to VREF/2 doubles LSB resolution for low-level unipolar signals such as thermocouples or strain gauges.
This page synthesizes authorized distributor stock, drop-in DIP-24 alternatives, and application design guidance for the MAX1270AENG - compiling practical knowledge across datasheet, lifecycle and footprint domains that a single distributor page typically does not cover.
直接替換替代品，適用於 MAX1270AENG — 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： MAX1270AENG （相同外形與佔位） — 差異在於 Number of Channels, Resolution, Manufacturer, Operating Temperature Range, Package.
MAX1270AENG+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1270BENG+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1270ACNG+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1270BCNG+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX162ACNG+
✅ 直接替換聯絡詢價
查看資料表 →MAX1270AENG 最大額定值與電氣特性
| Manufacturer | Maxim Integrated (now part of Analog Devices) |
| 解析度 | 12 bit |
| Number of Channels | 8 |
| 取樣率 | 110 ksps |
| Number of ADCs | 1 |
| Data Interface | MICROWIRE, QSPI, SPI, Serial (3-wire) |
| Input Type | Pseudo-Differential / Single-Ended, MUX |
| 供應電壓 | 5 V single supply |
| Analog Supply Voltage Range | 4.75 V to 5.25 V |
| Input Voltage Range (Software-Selectable) | 0 to VREF, 0 to VREF/2, ±VREF, ±VREF/2 |
| Internal Reference Voltage | 4.096 V (MAX1270A) |
| Linearity (DNL) | 0.5 LSB (max) |
| Bandwidth (Track/Hold) | 5 MHz |
| Fault-Protected Analog Inputs | ±17 V (without damage) |
| 工作溫度 | 0 °C to +70 °C |
| 封裝 / 外殼 | 24-DIP (0.300 inch, 7.62 mm) |
| 安裝類型 | Through-Hole |
| Architecture | SAR (Successive Approximation) |
| Screening Level | Commercial |
| RoHS 狀態 | Compliant |
| Sampling Rate (Per Second) | 110 k (per manufacturer family) |
MAX1270AENG 腳位配置
| 腳位 1 | AIN0 — Analog input channel 0 (8-channel MUX) |
| 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 | AIN5 — Analog input channel 5 |
| 腳位 7 | AIN6 — Analog input channel 6 |
| 腳位 8 | AIN7 — Analog input channel 7 |
| 腳位 9 | GND — Analog and digital ground |
| 腳位 10 | REF — Reference input/output (4.096 V internal for A variant) |
| 腳位 11 | VDD — +5 V analog and digital supply |
| 腳位 12 | SCLK — Serial clock input |
| 腳位 13 | DIN — Serial data input (configuration byte) |
| 腳位 14 | DOUT — Serial data output (conversion result) |
| 腳位 15 | CS — Chip-select, active low |
| 腳位 16 | SSTRB — Strobe output (conversion-complete status, optionally used) |
| 腳位 17 | AINCOM — Analog input common (return for ± inputs) |
| 腳位 18 | NC — Not connected (per datasheet) |
| 腳位 19 | NC — Not connected (per datasheet) |
| 腳位 20 | NC — Not connected (per datasheet) |
| 腳位 21 | NC — Not connected (per datasheet) |
| 腳位 22 | NC — Not connected (per datasheet) |
| 腳位 23 | NC — Not connected (per datasheet) |
| 腳位 24 | NC — Not connected (per datasheet) |
典型應用
MAX1270AENG 適用於 7 應用s: Industrial Process Control Analog Input Module, Multi-Channel Data Logger and Sensor Aggregator, Battery-Stack Monitoring and BMS Telemetry, Programmable Logic Controller Analog Input Cards, Embedded Instrumentation and Test Equipment Front-End, Building Automation and HVAC Multi-Sensor Hub, Medical Sensor Signal Aggregation Front-End.
Industrial Process Control Analog Input Module
The MAX1270AENG's ±17 V fault-protected analog inputs and 8-channel MUX suit industrial PLC analog input cards where field wiring can carry switching transients above the 5 V supply. Eight inputs multiplex into one 12-bit 110 ksps SAR converter, eliminating the need for a per-channel protection front-end. Designers connect 4-20 mA loop signals through a 250 Ω sense resistor for 1-5 V inputs and use ±VREF/2 range for ±10 V scaled outputs.
推薦
Multi-Channel Data Logger and Sensor Aggregator
Eight channel inputs let one MAX1270AENG serve thermocouple, RTD and strain-gauge sensors simultaneously through external signal conditioning. The internal 4.096 V reference provides up to 1 mV LSB resolution on the 0-4.096 V range, sufficient for K-type thermocouple cold-junction compensation. Hardware averaging via the configuration register reduces line-noise on slow data-logger channels while preserving 110 ksps on fast inputs.
推薦
Battery-Stack Monitoring and BMS Telemetry
With ±17 V fault protection on each input, the MAX1270AENG can be connected directly to multi-cell battery stacks above the +5 V supply without external dividers for low-voltage stacks. Eight cells can be monitored through one IC, reducing BMS BOM. The low 6 mA operating and 10 µA shutdown currents extend battery life in portable battery-test equipment and cell-balancing monitors.
推薦
Programmable Logic Controller Analog Input Cards
PLC analog input modules use the MAX1270AENG to digitize up to 8 analog signals per chip with 0.5 LSB DNL, ensuring closed-loop control fidelity. The SPI/QSPI/MICROWIRE-compatible 3-wire interface integrates directly with popular PLC microcontroller modules over SPI. Internal clock mode saves a host oscillator when deterministic timing is unnecessary, supporting cost-optimized low-density analog modules.
推薦
Embedded Instrumentation and Test Equipment Front-End
Handheld digital multimeters and oscilloscope front-ends use the MAX1270AENG for multi-range measurement. Internal 4.096 V reference and software-selectable ±VREF/2 range allow a single IC to serve 4 V, 5 V, 10 V and 20 V full-scale measurements, simplifying analog front-end design. Rapid successive-approximation conversion yields deterministic sample timing that lowers measurement uncertainty in calibrated test gear.
推薦
Building Automation and HVAC Multi-Sensor Hub
In HVAC controllers and smart-building gateways, the MAX1270AENG aggregates 8 analog sensor streams - temperature, humidity via analog transducer, gas sensor, light level - to a single microcontroller. The internal reference reduces BOM for cost-optimized commercial HVAC hardware. Low shutdown current (< 10 µA) keeps idle power minimal when the system is in sleep mode, supporting ENERGY STAR efficiency targets.
推薦
Medical Sensor Signal Aggregation Front-End
Medical monitoring peripherals and portable diagnostic devices use the MAX1270AENG to consolidate multiple low-frequency patient-sensor signals - ECG leads, SpO2 photodiode current, temperature probes - into one 110 ksps 12-bit data stream. Fault-protected inputs tolerate electrocautery and defibrillator transients exceeding the 5 V supply. The DIP-24 package simplifies medical-grade through-hole assembly common in clinical instrumentation, with each ADC channel providing deterministic conversion latency for synchronized multi-lead acquisition.
推薦
推薦產品摘要
工程參考資料，適用於 MAX1270AENG — 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 | MAX1270AENG+ | MAX1270BENG+ | MAX1270ACNG+ | MAX1270BCNG+ | MAX162ACNG+ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 24-PDIP | 24-PDIP - same | 24-PDIP - same | 24-PDIP - same | 24-PDIP - same | 24-PDIP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Number of Channels | 8 | 8 | 8 | 8 | 8 | 8 |
| Internal Reference | Yes (4.096 V) | Yes (4.096 V) | No (external only) | Yes (4.096 V) | No (external only) | Yes |
| Operating Temperature | 0 to +70 C | 0 to +70 C | 0 to +70 C | -40 to +85 C | -40 to +85 C | -40 to +85 C |
| Fault-Protected Inputs | ±17 V | ±17 V | ±17 V | ±17 V | ±17 V | ±17 V |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
主要差異化特點
- ±17 V fault-protected analog inputs on every channel (對比MAX162ACNG+)
- On-chip 4.096 V internal reference with VREF output (對比MAX1270BENG+)
- 110 ksps throughput with software-selectable internal/external clock (對比MAX1270ACNG+)
設計說明
Place the 0.1 µF decoupling capacitor as close as possible between VDD (pin 11) and GND (pin 9), with a 10 µF bulk on the supply rail within ~2 cm. Bypass the REF pin with a 0.1 µF ceramic (and a 10 µF tantalum for highest accuracy) on the MAX1270A internal-reference variant. Keep analog and digital traces separated, and use a star ground at the AGND/DGND-adjacent pin to minimize conversion noise.
Avoid applying more than ±17 V on analog inputs even in shutdown, as the MUX ESD diodes will clamp; the device survives ±17 V transient but DC operation beyond the range is not specified. When selecting the input range, ensure the chosen range covers the expected signal peaks - selecting 0-VREF/2 range for a true bipolar signal saturates the converter. Use the configuration-register's external/internal clock bit to choose deterministic SPI timing when sample-rate accuracy matters.
Route the SPI lines (SCLK, DIN, DOUT, CS) away from the analog inputs. Place a 100 Ω series-termination on SCLK and DOUT when the MCU is more than 50 mm from the ADC to suppress SPI ringing that could fold into the conversion. For remote analog inputs longer than 100 mm, twist the input wires with a ground return to reject common-mode noise; maximize ADC sample settling with a low-pass RC at the AIN pins if signals are < 1 kHz.
合規資訊
Lead-free RoHS-compliant finish per Maxim datasheet. Commercial-grade part (0 to +70 C); not AEC-Q100 qualified - choose MAX1270ACNG for extended industrial -40 to +85 C. Halogen-free status not explicitly stated in verified data.
