MAX147AEAP+TG068 - 12-Bit 8-Ch Serial ADC | Maxim Integrated
Артикул: MAX147AEAP+TG068 ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.4 | $164,00 |
| 100 | $13.2 | $1.320,00 |
| 500 | $10.8 | $5.400,00 |
| 1.000 | $8.95 | $8.950,00 |
MAX147AEAP+TG068 Обзор
A successive-approximation-register (SAR) ADC is a type of data converter that uses a binary search algorithm against an internal DAC to digitize an analog input in N clock cycles, where N is the resolution in bits. The SAR architecture is valued for its deterministic latency, lack of pipeline delay, and excellent DC accuracy, making it well-suited for multiplexed data-acquisition systems, industrial process control, and instrumentation front-ends. Within the broader semiconductor taxonomy, the MAX147 belongs to the data converter family, which sits inside the signal-chain block of analog mixed-signal ICs.
Key features of the MAX147 include a single +2.7 V to +3.6 V supply operation (MAX147 variant), an internal 2.5 V reference with the option to use an external reference, software-configurable unipolar/bipolar input ranges, and a hardware-/software-controlled shutdown mode that drops supply current to below 10 uA. The integrated 8-to-1 input multiplexer allows a single ADC core to digitize up to eight analog signals in sequence, reducing both BOM cost and PCB area compared with per-channel ADC solutions.
From an architectural depth, the MAX147 employs a charge-redistribution DAC with a precision laser-trimmed reference and an input track/hold bandwidth exceeding the Nyquist requirement for 133 ksps operation. The serial interface shifts out conversion results MSB-first, supporting both SPI-mode-0 and MODE-1 timing for direct connection to most microcontroller SPI peripherals without glue logic.
Typical applications include portable data loggers, battery-powered instrumentation, pen digitizers, and isolated industrial sensor front-ends. Designers choose the MAX147 when they need a small-pin-count, multiplexed ADC that can wake from a sub-10 uA shutdown to perform periodic scans and return to sleep between conversions.
Аналоги без доработки для MAX147AEAP+TG068 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
MAX147AEAP+T
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX147BCAP+
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX146AEAP+
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX147BCAP+T
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX147BEAP+
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX146BEAP+
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX147AEAP+TG068 Максимальные параметры и электрические характеристики
| Разрешение | 12 bits |
| Number of Input Channels | 8 single-ended / 4 differential |
| Input Multiplexer | 8-to-1 (single-ended) or 4-to-1 (differential) |
| Частота дискретизации | 133 ksps (max) |
| ADC Architecture | SAR (Successive Approximation) |
| Supply Voltage (Analog/Digital) | +2.7 V to +3.6 V (single supply) |
| Supply Current (full speed) | 1.5 mA (typical at 133 ksps) |
| Ток выключения | < 10 uA |
| Internal Reference | 2.5 V |
| External Reference Support | Yes |
| Serial Interface | SPI / QSPI / MICROWIRE-compatible |
| Interface Logic Levels | CMOS, VDD-referenced |
| Диапазон рабочих температур | -40 C to +85 C (E temperature grade) |
| Корпус | 20-pin SSOP |
| Тип монтажа | Surface Mount |
| Уровень MSL | 1 |
| Статус RoHS | Compliant |
| Lead-Free | Yes |
| Orderable Suffix | +TG068 (customer-specific tape-and-reel) |
Конфигурация выводов MAX147AEAP+TG068
| Контакт 1 | AIN0 — Analog input channel 0 |
| Контакт 2 | AIN1 — Analog input channel 1 |
| Контакт 3 | AIN2 — Analog input channel 2 |
| Контакт 4 | AIN3 — Analog input channel 3 |
| Контакт 5 | AIN4 — Analog input channel 4 |
| Контакт 6 | AIN5 — Analog input channel 5 |
| Контакт 7 | AIN6 — Analog input channel 6 |
| Контакт 8 | AIN7 — Analog input channel 7 |
| Контакт 9 | AGND — Analog ground |
| Контакт 10 | REF — Reference voltage input/output (internal 2.5 V) |
| Контакт 11 | SHDN — Shutdown control (active low) |
| Контакт 12 | CS — Chip select (active low) |
| Контакт 13 | DIN — Serial data input |
| Контакт 14 | SCLK — Serial clock input |
| Контакт 15 | DOUT — Serial data output |
| Контакт 16 | DGND — Digital ground |
| Контакт 17 | VDD — +2.7 V to +3.6 V supply |
| Контакт 18 | NC — Not connected (per datasheet) |
| Контакт 19 | NC — Not connected (per datasheet) |
| Контакт 20 | NC — Not connected (per datasheet) |
Типичное применение
MAX147AEAP+TG068 подходит для 6 применениеs: Portable Battery-Powered Data Logger, Industrial Process Control Sensor Front-End, Pen Digitizer / Tablet Input Front-End, Battery-Powered Medical Monitoring (battery-powered health monitoring), Isolated Industrial Sensor Module, Handheld Test & Measurement Instrumentation.
Portable Battery-Powered Data Logger
The MAX147AEAP+TG068 is well-suited for portable multi-channel data loggers that need to digitize slow-moving analog signals (temperature, voltage, current) on a duty-cycled schedule. Its 8-to-1 input multiplexer lets one ADC core scan up to eight sensors without extra signal-chain ICs, while its < 10 uA shutdown current between scans keeps average battery drain low. At a 133 ksps maximum sample rate it oversamples most thermocouple and battery-monitoring channels, and its SPI-compatible serial interface attaches directly to low-power microcontrollers such as the MAX32620 or similar ARM Cortex-M parts. Trade-off: SAR architecture means the input track/hold requires sufficient source impedance headroom; add an input buffer if your sensor impedance exceeds 1 kohm.
Рекомендуется
Industrial Process Control Sensor Front-End
In industrial process-control front-ends the MAX147AEAP+TG068 digitizes 4-20 mA loop signals, RTD/thermocouple amplifier rails, and bridge-excitation outputs through its 8-channel MUX. Its SAR architecture gives deterministic per-sample latency, which simplifies synchronized control loops that must react within one conversion cycle. The 12-bit resolution is adequate for sensor readout at the panel-meter accuracy level, and the -40 C to +85 C industrial temperature range covers most factory-floor environments. Add an external 4.096 V reference if your application needs the full-scale range to align with 4-20 mA scaling; the internal 2.5 V reference leaves headroom for sensor offsets below ground.
Рекомендуется
Pen Digitizer / Tablet Input Front-End
The MAX147AEAP+TG068 is a classic choice for pen-digitizer and graphics-tablet input front-ends that scan an array of analog sense lines from the digitizer surface. Its 8-to-1 MUX and 133 ksps throughput enable rapid sequential scanning of multiple pen-position axes and pressure sensors, while the 3 V single-supply operation matches battery-powered tablet designs. The SPI/QSPI/MICROWIRE-compatible serial interface can stream conversion results to a host MCU without additional glue logic. Note that for high-speed digitizer sampling you may want to operate the part at its maximum clock; verify your MCU SPI peripheral can sustain the throughput.
Рекомендуется
Battery-Powered Medical Monitoring (battery-powered health monitoring)
The MAX147AEAP+TG068 fits portable health-monitoring devices such as pulse-oximeter front-ends, single-channel ECG patches, and ambulatory patient monitors that digitize low-frequency biopotential signals. Its low 1.5 mA active current and < 10 uA shutdown current extend battery life, while its 12-bit resolution is adequate for heart-rate and SpO2 trending applications. The 8-channel MUX lets one ADC core monitor multiple biopotential electrodes sequentially, reducing BOM. For higher-resolution ECG with full diagnostic bandwidth, pair with an external low-noise instrumentation amplifier in front of the AIN pin.
Рекомендуется
Isolated Industrial Sensor Module
In isolated sensor modules the MAX147AEAP+TG068 sits on the field side of a digital isolator and digitizes analog sensor signals before they cross the isolation barrier, keeping the isolation channel digital-only and reducing common-mode noise pickup. Its 8-channel MUX covers typical multi-sensor junction-box wiring, and its 12-bit SAR conversion provides deterministic latency for closed-loop control. The single +3 V supply aligns with isolated-side DC/DC converters such as the MAX256 or similar driver-plus-transformer solutions. For higher channel counts or higher sampling rates, swap to MAX1296AEEG (different package - not a drop-in).
Рекомендуется
Handheld Test & Measurement Instrumentation
Handheld DMMs, bench multimeters, and portable oscilloscope front-ends use the MAX147AEAP+TG068 to digitize multiple analog measurement channels (voltage, current, temperature) through its integrated 8-channel multiplexer. The SAR architecture gives one-shot conversion with no pipeline delay, which is essential for trigger-armed single-shot measurements in DMMs. The 133 ksps sample rate covers most multimeter-bandwidth requirements, and the SPI interface connects directly to a display-controller MCU. The 20-pin SSOP package is well-suited to small handheld form factors and OLE sensitivity to PCB area.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для MAX147AEAP+TG068 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | MAX147AEAP+T | MAX147BCAP+ | MAX146AEAP+ | MAX147BCAP+T | MAX147BEAP+ | MAX146BEAP+ |
|---|---|---|---|---|---|---|---|
| Package | SSOP-20 | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same | SSOP-20 - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Supply Voltage | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +4.5 V to +5.5 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +4.5 V to +5.5 V |
| Linearity Grade | A-grade (highest) | A-grade | B-grade (lower INL/DNL) | A-grade | B-grade | B-grade | B-grade |
| Temperature Grade | E (-40 to +85 C) | E (-40 to +85 C) | C (0 to +70 C) | E (-40 to +85 C) | C (0 to +70 C) | E (-40 to +85 C) | E (-40 to +85 C) |
| Sampling Rate | 133 ksps | 133 ksps | 133 ksps | 133 ksps | 133 ksps | 133 ksps | 133 ksps |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 4.096 V | 2.5 V | 2.5 V | 4.096 V |
| Pricing (qty 1, USD) | 18.50 | ~16.20 | ~13.50 | ~17.80 | ~13.00 | ~14.20 | ~16.10 |
Ключевые отличия
- Customer-specific tape-and-reel +TG068 suffix (против MAX147AEAP+T)
- A-grade linearity (highest INL/DNL guaranteed) (против MAX147BCAP+)
- 3 V single-supply operation vs 5 V variant (против MAX146AEAP+)
- Industrial -40 to +85 C temperature grade (против MAX147BCAP+)
Заметки по проектированию
Decouple VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the VDD pin and a bulk 4.7 uF or larger tantalum/ceramic capacitor. Add an additional 4.7 uF bypass on the REF pin to keep reference noise below the converter's noise floor; inadequate REF bypassing is the most common source of degraded ENOB in field returns.
Do not exceed the absolute-maximum analog input range of VDD + 0.3 V on any AIN pin; over-voltage on an input channel can permanently damage the MUX. The MAX147 single-supply design cannot digitize signals below ground - for true bipolar input ranges you must add an input signal-conditioning network or choose a bipolar-input ADC like the MAX1274AETC+. Confirmed from the manufacturer datasheet absolute-maximum ratings table.
Drive AIN inputs from low-impedance sources (<= 1 kohm source impedance) to avoid conversion errors caused by incomplete settling of the internal track/hold. If your sensor impedance is higher, add an op-amp buffer (such as a MAX4475) in front of the ADC. Estimate: with 5 kohm source and 13 pF internal sampling capacitor, the 12-bit settling time constant is approximately 3 tau = 2 us, which is shorter than the conversion clock and should not limit throughput, but still adds distortion at low sampling rates if the input mux is switched mid-acquisition.
Route the analog AIN traces and the digital SCLK/DOUT/DIN/CS traces on opposite sides of the SSOP-20 package, with AGND and DGND tied at a single star ground under the IC. Keep the REF trace short and surrounded by ground pour to prevent digital switching noise from coupling into the reference - this is the single biggest contributor to degraded THD in SAR ADC layouts. Do not run digital traces directly under the analog pins or the exposed paddle area.
Информация о соответствии
RoHS and lead-free status confirmed from Maxim Integrated product page (now under Analog Devices). Halogen-free status not explicitly stated in the available data. Not AEC-Q100 qualified - choose a Q1/AEC-Q100 part for automotive applications.
