MAX1245AEAP - 12-Bit 8-Ch 100ksps Serial ADC | Maxim Integrated
Артикул: MAX1245AEAP ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $11.2 | $11,20 |
| 10 | $10.05 | $100,50 |
| 100 | $8.92 | $892,00 |
| 500 | $7.65 | $3.825,00 |
| 1.000 | $6.5 | $6.500,00 |
MAX1245AEAP Обзор
A successive-approximation register (SAR) ADC is a type of data converter that resolves a single analog sample by comparing it against a binary-weighted reference using an internal DAC and a comparator. SAR ADCs are valued for their deterministic latency, lack of pipeline delay, and excellent DC accuracy, which is why they dominate multiplexed data-acquisition front-ends where multiple sensor channels must be digitized without latency skew. The MAX1245AEAP combines this SAR core with an 8-channel analog MUX, allowing one ADC to sequentially serve eight single-ended or pseudo-differential analog sources.
Key features include 100 ksps throughput, ±1 LSB (max) integral nonlinearity, software-configurable unipolar/bipolar input ranges, on-chip clock generation, hardware or software shutdown for power savings, and an SPI/QSPI/MICROWIRE-compatible serial interface. The internal reference architecture and wide input multiplexer bandwidth allow direct connection to slow-moving sensor signals without external buffering.
The MAX1245AEAP uses a charge-redistribution DAC architecture with an input track-and-hold, supporting single-ended analog inputs from CH0..CH7 with software channel selection. Internal calibration logic and a serial data-alignment mode (MSB-first) simplify firmware integration. Bipolar or unipolar operation can be configured per channel by software, increasing flexibility for mixed-signal front-ends.
Typical applications include portable instrumentation, data loggers, pen tablets, touch-screen digitizers, HVAC controllers, and industrial process control where multi-channel analog monitoring is required. The 20-pin SSOP package offers a compact footprint suitable for high-density PCB layouts. For higher analog supply voltages (up to +5V), Maxim recommends the pin-compatible MAX1246 family as an upgrade path. When designing, observe the supply-decoupling rules in the datasheet: place 0.1 uF ceramic bypass capacitors as close as possible to the VDD and AGND pins to maintain low digital-noise coupling into the analog front-end.
Аналоги без доработки для MAX1245AEAP — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с MAX1245AEAP (тот же форм-фактор и посадочное место) — отличается по Resolution, Package, Analog Input Range, Architecture, Input Type.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
MAX1245AEAP+
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX1245AEAP-T
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX1246AEAP
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX1247AEAP
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX1156AEUP+T
✅ Прямая замена✓ В наличии
$7.8 / шт.
Открыть даташит →MAX1145BEAP+
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$5.95 / шт.
Открыть даташит →MAX1245AEAP Максимальные параметры и электрические характеристики
| Разрешение | 12 bits |
| Number of Channels | 8 |
| Частота дискретизации | 100 ksps |
| Analog Supply Voltage | +2.375 V (single positive supply) |
| Digital Supply Voltage | +2.375 V (referenced to VDD) |
| Input Type | Single-ended / pseudo-differential (software configured) |
| Интерфейс | 4-wire SPI / QSPI / MICROWIRE compatible, serial |
| Architecture | SAR (Successive Approximation Register) with track/hold |
| Integral Nonlinearity (INL) | ±1 LSB (max) |
| Analog Input Range | 0 V to VREF (unipolar); software-configurable bipolar |
| Корпус | 20-pin SSOP |
| Тип монтажа | Surface Mount |
Конфигурация выводов MAX1245AEAP
| Контакт 1 | CH0 — Analog input channel 0 |
| Контакт 2 | CH1 — Analog input channel 1 |
| Контакт 3 | CH2 — Analog input channel 2 |
| Контакт 4 | CH3 — Analog input channel 3 |
| Контакт 5 | CH4 — Analog input channel 4 |
| Контакт 6 | CH5 — Analog input channel 5 |
| Контакт 7 | CH6 — Analog input channel 6 |
| Контакт 8 | CH7 — Analog input channel 7 |
| Контакт 9 | AGND — Analog ground |
| Контакт 10 | REF — External reference voltage input |
| Контакт 11 | VDD — Analog +2.375 V supply |
| Контакт 12 | DGND — Digital ground |
| Контакт 13 | SCLK — Serial clock input |
| Контакт 14 | DIN — Serial data input (MOSI) |
| Контакт 15 | DOUT — Serial data output (MISO) |
| Контакт 16 | CS — Chip select (active low) |
| Контакт 17 | SHDN — Hardware shutdown (active low) |
| Контакт 18 | OSC — External clock input / internal oscillator pin |
| Контакт 19 | NC — Not connected (per datasheet) |
| Контакт 20 | NC — Not connected (per datasheet) |
Типичное применение
MAX1245AEAP подходит для 6 применениеs: Portable Data Logger, Industrial Process Control / PLC, Touch-Screen / Pen-Tablet Digitizer, HVAC Environmental Monitor, Medical Patient Monitoring (Non-Critical), Battery-Powered Sensor Hub.
Portable Data Logger
The MAX1245AEAP is a strong fit for portable data loggers because it combines an 8-channel analog multiplexer, 100 ksps sampling, and hardware/software shutdown modes in a compact 20-SSOP footprint, allowing direct digitization of multiple sensor inputs without an external MUX. According to the Maxim datasheet, the +2.375 V supply rating supports 2x AA or single Li-ion battery-powered designs where energy efficiency matters, and the 4-wire SPI interface lets a low-power microcontroller enter sleep between conversions. A typical circuit places the MAX1245AEAP between the sensor front-end and the host MCU, with 0.1 uF ceramic bypass caps on VDD and AGND as specified in the layout guidelines.
Рекомендуется
Industrial Process Control / PLC
The MAX1245AEAP's 8 single-ended input channels and software-configurable unipolar/bipolar ranges make it well-suited for industrial process control and small PLC analog input modules. Per the Maxim datasheet, the 100 ksps throughput is sufficient for slow-to-medium speed control loops (temperature, pressure, flow), and the SAR architecture provides deterministic conversion latency for time-synchronized sampling. Industrial designers typically pair the part with a 2.5 V or 4.096 V external reference and add TVS protection on each analog input pin. The 20-SSOP footprint supports compact DIN-rail mounted modules.
Рекомендуется
Touch-Screen / Pen-Tablet Digitizer
Per the Maxim datasheet, the MAX1245AEAP is well-suited to pen-tablet and touch-screen digitizer front-ends, where its 8-channel multiplexer and 100 ksps sampling rate can sequentially digitize X/Y position sensor signals plus pen-pressure channels. The SAR core provides deterministic latency critical for smooth cursor tracking, and the SPI interface streams samples directly to the host controller. Designers typically connect the resistive touch matrix to four channels and use the remaining channels for force sensors or pen-tip pressure. The compact 20-SSOP footprint is ideal for slim tablet housings.
Рекомендуется
HVAC Environmental Monitor
The MAX1245AEAP fits HVAC environmental monitors that must read temperature, humidity, airflow, and CO2 sensor channels from a single ADC. According to the Maxim datasheet, the 8-channel input multiplexer eliminates the need for an external analog switch, and the low operating current plus shutdown pin support battery-backed sensor nodes. The +2.375 V supply is compatible with 3.3 V or 2.5 V sensor front-ends after a small LDO drop. Each analog input is software-mapped to a sensor type, allowing flexible channel-to-function assignment in firmware.
Рекомендуется
Medical Patient Monitoring (Non-Critical)
For non-critical medical monitoring such as bedside patient thermometers or pulse-oximeter front-end conditioning, the MAX1245AEAP provides 12-bit resolution with the SAR architecture's deterministic latency. Per the Maxim datasheet, the part can multiplex multiple bio-signal channels through a single ADC, simplifying BOM and board layout in compact bedside enclosures. Designers should add input protection networks and follow IEC 60601 isolation guidelines for any line-powered medical application. The 20-SSOP footprint supports slim, lightweight patient-worn form factors.
Рекомендуется
Battery-Powered Sensor Hub
The MAX1245AEAP's low operating current and shutdown mode make it a good fit for battery-powered sensor hubs that must digitize multiple analog channels while extending battery life. According to the Maxim datasheet, the hardware-shutdown pin reduces quiescent current between conversions, and the +2.375 V analog supply rail is compatible with single-cell Li-ion (3.0-3.6 V nominal, post-LDO) and 2x AA (3.0 V) power architectures. The SPI interface allows a low-power MCU to wake, take a burst of samples, then return to deep sleep, maximizing battery life in wireless sensor nodes.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для MAX1245AEAP — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | MAX1245AEAP+ | MAX1245AEAP-T | MAX1246AEAP | MAX1247AEAP | MAX1156AEUP+T |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-TSSOP - same pin count, similar pitch |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | |
| Channels | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended | 8 single-ended | |
| Interface | 4-wire SPI/QSPI/MICROWIRE | 4-wire SPI/QSPI/MICROWIRE | 4-wire SPI/QSPI/MICROWIRE | 4-wire SPI/QSPI/MICROWIRE | SPI compatible |
Ключевые отличия
- Lowest-voltage pin-compatible variant in the MAX1245/46/47 family (против MAX1246AEAP / MAX1247AEAP)
- Integrated 8-channel multiplexer eliminates external analog switch (против MAX1240BEPA+ (lower-channel ADC))
- Hardware + software shutdown for ultra-low-power operation (против MAX1156AEUP+T)
Заметки по проектированию
Place a 0.1 uF ceramic bypass capacitor as close as possible to the VDD pin and a 10 uF bulk capacitor near the AGND/VSS star-ground point to minimize digital switching noise coupling into the analog front-end. Per the Maxim datasheet, the reference input (REF pin) also requires a high-quality bypass capacitor (typically 0.1 uF ceramic in parallel with 1-10 uF) to reject supply ripple. Avoid routing digital traces directly under the analog input traces to prevent capacitive coupling.
Do not exceed the +2.375 V analog supply rating on the MAX1245AEAP - if your system rail is 3.3 V or 5 V, use the pin-compatible MAX1247 or MAX1246 variants respectively. Ensure the reference voltage does not exceed VDD, as over-driving REF can damage the internal reference buffer. Verify timing parameters (SCLK period, tACQ acquisition time) against your MCU's SPI clock divider to avoid data-corruption.
Use a single-point star ground topology with AGND and DGND connected only at one point near the IC to avoid ground-loop noise coupling into the analog inputs. Per the Maxim datasheet, the analog input traces should be guarded by ground traces on both sides and kept short to minimize PCB parasitic capacitance. Place the external reference (if used) close to the REF pin with short, wide traces. Differential routing of SCLK and DOUT helps reject common-mode noise on the digital interface.
When using the MAX1245AEAP in electrically noisy industrial environments, add TVS diodes and RC filter networks on each analog input pin to protect against ESD and surge events. The MAX1245AEAP's analog input multiplexer bandwidth supports the track-and-hold's acquisition time per the datasheet, but adding series resistance > 1 kohm on the analog inputs may require increasing the acquisition time in firmware. For best DC accuracy, use the hardware-shutdown pin between conversions to enter a low-noise state before each conversion.
Информация о соответствии
RoHS-compliant lead-free variants are distinguished by the '+' suffix (e.g., MAX1245AEAP+). The base MAX1245AEAP without the '+' suffix is the standard (non-RoHS) version; RoHS, REACH, halogen-free, and conflict-minerals status were not extractable from the verified web data and are marked [DATA_NEEDED]. Not AEC-Q100 qualified - this part targets industrial/commercial, not automotive.
