ADC08038CIWMX - 8-Bit 8-Ch SAR ADC w/Serial I/O | Texas Instruments
Артикул: ADC08038CIWMX ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $3.92 | $3,92 |
| 10 | $3.45 | $34,50 |
| 100 | $2.85 | $285,00 |
| 500 | $2.32 | $1.160,00 |
| 1.000 | $1.95 | $1.950,00 |
ADC08038CIWMX Обзор
An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary search algorithm and an internal capacitive DAC to convert an analog input voltage to a digital code, one bit per clock cycle. SAR ADCs sit within the broader hierarchy of data converter -> ADC -> successive approximation architecture -> precision mixed-signal IC, and they are widely preferred when low-latency deterministic conversion, modest resolution, and small package footprint are simultaneously required. The 8-input multiplexer allows a single ADC core to digitize up to eight sensors or signals, reducing BOM area and cost in multi-channel systems.
Key features include 8-bit resolution, 8 analog input channels with analog multiplexer, internal sample-and-hold, on-chip reference, MICROWIRE/serial-compatible data interface, and single +5V analog supply with digital supply separate for low-noise operation. The wide-body 20-SOIC package offers robust thermal performance and is suitable for both industrial and commercial environments.
The ADC08038 uses a charge-redistribution SAR architecture with an internal capacitor DAC and a precision comparator. Its throughput of up to approximately 1 MSPS (depending on MPN variant and clock), combined with an internal reference and 8-channel analog multiplexer, makes it well-suited for multi-sensor acquisition in compact designs where a single ADC must serve multiple analog sources.
Typical applications include multi-channel data acquisition systems, process control and instrumentation, industrial sensor monitoring, portable battery-powered instrumentation, automotive sensor interfaces, and embedded microcontroller analog front-ends. The internal reference eliminates the need for an external reference IC in many designs, simplifying the BOM and reducing PCB area.
When designing with this device, ensure the analog and digital grounds are tied at a single point to minimize digital noise coupling into the analog front-end. Decouple VCC and VREF pins with 0.1 uF capacitors placed as close as possible to the IC pins, and use a low-impedance analog input path to preserve the 8-bit accuracy.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single reference for sourcing and second-sourcing decisions as of October 2026.
Аналоги без доработки для ADC08038CIWMX — 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 ADC08038CIWMX (тот же форм-фактор и посадочное место) — отличается по Data Interface.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ADC08034CIWMX
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADC08038CIWM/NOPB
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADC08031CIWMX
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADC08032CIWMX
✅ Прямая замена✓ В наличии
$2.88 / шт.
Открыть даташит →ADC08038CIWM
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADC08038CIWMX Максимальные параметры и электрические характеристики
| Разрешение | 8 bit |
| Number of Analog Inputs | 8 |
| Architecture | SAR (Successive Approximation Register) |
| Частота дискретизации | Up to 1 MSPS (per IC-Components datasheet summary) |
| Data Interface | MICROWIRE-compatible serial |
| Корпус / Типоразмер | 20-SOIC (0.295", 7.50 mm width) |
| Input Type | Single-ended, pseudo-differential (per family) |
| Number of ADC Channels | 1 (with 8-input mux) |
| On-Chip Reference | Yes (internal voltage reference) |
| Диапазон рабочих температур | -40C to +85C (per IC-Components datasheet summary) |
| Тип монтажа | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Статус RoHS | Compliant (IWMX suffix per DigiKey listing) |
| Conversion Type | SAR with internal S/H |
| Series / Family | ADC08031/ADC08032/ADC08034/ADC08038 |
Конфигурация выводов ADC08038CIWMX
| Контакт 1 | VCC — Analog supply voltage (+5V typical) |
| Контакт 2 | CH0 — Analog input channel 0 |
| Контакт 3 | CH1 — Analog input channel 1 |
| Контакт 4 | CH2 — Analog input channel 2 |
| Контакт 5 | CH3 — Analog input channel 3 |
| Контакт 6 | CH4 — Analog input channel 4 |
| Контакт 7 | CH5 — Analog input channel 5 |
| Контакт 8 | CH6 — Analog input channel 6 |
| Контакт 9 | CH7 — Analog input channel 7 |
| Контакт 10 | AGND — Analog ground |
| Контакт 11 | VREF — Voltage reference (internal reference output / bypass) |
| Контакт 12 | DGND — Digital ground |
| Контакт 13 | CS — Chip select (active low) |
| Контакт 14 | CLK — Serial clock input |
| Контакт 15 | DO — Serial data output |
| Контакт 16 | DI — Serial data input (MUX address) |
| Контакт 17 | A0 — Mux address bit 0 |
| Контакт 18 | A1 — Mux address bit 1 |
| Контакт 19 | A2 — Mux address bit 2 |
| Контакт 20 | VCC2 — Digital supply voltage |
Типичное применение
ADC08038CIWMX подходит для 7 применениеs: Multi-Channel Industrial Sensor Monitoring, Process Control and Instrumentation, Portable Battery-Powered Instrumentation, Embedded Microcontroller Analog Front-End, Automotive Sensor Interface (Legacy Designs), Data Acquisition Front-End Boards, Educational / Development Board ADC Channel.
Multi-Channel Industrial Sensor Monitoring
The ADC08038CIWMX is well suited to multi-channel industrial sensor monitoring where 8 sensors (temperature, pressure, level, flow, etc.) must be digitized through a single ADC. Its 8-input analog multiplexer eliminates the need for an external mux, and the on-chip voltage reference removes the external reference IC - both reducing BOM cost. The MICROWIRE-compatible serial interface minimizes microcontroller pin count, leaving more GPIOs for other peripherals in the panel-meter or PLC module.
Рекомендуется
Process Control and Instrumentation
Process control loops require deterministic, low-latency analog acquisition; the ADC08038CIWMX's SAR architecture provides a single-cycle conversion with no pipeline delay, ideal for control loops where the controller must react within one sample interval. The internal sample-and-Hold eliminates external S/H components, simplifying the analog front-end. The 8-bit resolution is sufficient for setpoint monitoring, valve position feedback, and 4-20 mA loop read-back in process control panels.
Рекомендуется
Portable Battery-Powered Instrumentation
The ADC08038CIWMX serves portable handheld instruments (digital multimeters, environmental loggers, hand-held thermometers) where low power consumption and small PCB area are critical. Its SAR core draws power only during conversion, allowing the host MCU to power-cycle the ADC between samples for sub-mA average consumption. The 20-SOIC wide-body package is hand-solderable and easy to rework, supporting low-volume test-instrument production runs.
Рекомендуется
Embedded Microcontroller Analog Front-End
Embedded designs using 8051, PIC, MSP430, or low-end ARM MCUs often need multi-channel analog inputs beyond the MCU's internal ADC channels. The ADC08038CIWMX provides 8 external channels with serial MICROWIRE interface - the same SPI-like bus used by many MCUs - requiring only 3-4 GPIO pins. This lets the design add 8 analog inputs without changing the host MCU and consolidates for sensor-rich embedded products such as HVAC controllers and home appliances.
Рекомендуется
Automotive Sensor Interface (Legacy Designs)
Legacy automotive designs use the ADC08038 family for non-safety sensor acquisition such as dashboard sensor readouts, HVAC panel monitoring, and body-control module analog inputs. The -40C to +85C operating temperature range covers automotive interior environments, and the wide SOIC package withstands the thermal cycling of under-dash mounting. For new automotive safety designs, TI recommends AEC-Q100 qualified alternatives, but the ADC08038 remains in production for non-critical analog channels.
Рекомендуется
Data Acquisition Front-End Boards
External data acquisition (DAQ) boards for PC-based measurement often use the ADC08038CIWMX for cost-effective multi-channel analog inputs at 8-bit resolution. The serial MICROWIRE interface simplifies USB-to-DAQ module designs by reducing the FPGA/CPLD pin count required to interface with the ADC. The internal reference eliminates one external component per board, lowering both BOM cost and assembly time for high-channel-count DAQ modules.
Рекомендуется
Educational / Development Board ADC Channel
University labs, microcontroller training kits, and hobbyist development boards use the ADC08038CIWMX to expose learners to multi-channel SAR ADC concepts without the cost of modern 12-16-bit parts. Its simple serial interface, on-chip reference, and breadboard-friendly SOIC package make it ideal for teaching SAR conversion, multiplexer addressing, and reference-voltage design. The 8-bit resolution is sufficient for analog joystick, slider, and sensor experiments in educational contexts.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ADC08038CIWMX — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ADC08034CIWMX | ADC08038CIWM/NOPB | ADC08031CIWMX | ADC08032CIWMX | ADC08038CIWM |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-SOIC (IWM, 7.50 mm width) | 20-SOIC (IWM) - same | 20-SOIC (IWM) - same | 20-SOIC (IWM) - same | 20-SOIC (IWM) - same | 20-SOIC (IWM) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Number of Input Channels | 8 | 4 (-50%) | 8 | 2 (-75%) | 4 (-50%) | 8 |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Serial Interface | MICROWIRE-compatible | MICROWIRE-compatible | MICROWIRE-compatible | MICROWIRE-compatible | MICROWIRE-compatible | MICROWIRE-compatible |
| On-Chip Reference | Yes | Yes | Yes | Yes | Yes | Yes |
| Packaging Format | Tape & Reel (TR) | Tape & Reel | Tube (NOPB) | Tape & Reel | Tape & Reel | Tube |
| RoHS Status | Compliant (IWMX suffix) | Compliant | Compliant (NOPB = lead-free) | Compliant | Compliant | Check variant |
Ключевые отличия
- Higher channel count than the ADC08034CIWMX in the same package (против ADC08034CIWMX)
- Same die as the ADC08038CIWM (tube variant) for design flexibility (против ADC08038CIWM)
- Lower channel-count option exists (ADC08032CIWMX) for cost-optimized designs (против ADC08032CIWMX)
Заметки по проектированию
Decouple the VCC (analog) and VCC2 (digital) pins with separate 0.1 uF ceramic capacitors placed as close as possible to each pin, with a 10 uF bulk capacitor nearby. The SAR core draws current only during conversion; provide adequate VREF bypass capacitance (typically 0.1-10 uF) to keep the internal reference stable across all 8 input channels. Star-ground the analog and digital grounds at a single point near the IC's AGND/DGND pins to prevent digital switching noise from coupling into the analog front-end.
Route the analog input traces (CH0-CH7) as short as possible and away from the serial digital lines (CLK, DO, DI, CS). Place a guard ground trace between the analog input area and the digital MICROWIRE bus to minimize capacitive coupling. The 20-SOIC wide-body (IWM) package has a generous thermal pad area; flood the analog-side copper pour to act as a low-impedance ground return for the analog inputs and to improve thermal dissipation for the SAR core during high-throughput conversion.
The MICROWIRE serial interface is sensitive to clock edge rates; use a clean clock source from the host MCU with rise/fall times below 10 ns for reliable data transfer. Add a small series resistor (22-100 ohm) on the CLK line near the MCU if long traces or noise coupling are a concern. The DO (data output) line can be left floating when CS is high; pull it up externally if your MCU expects a defined idle level.
Common pitfalls: (1) failing to issue a MUX-address write via DI before each conversion - the ADC retains the previous channel address by default; (2) leaving VREF floating when using the internal reference - always bypass VREF to AGND with a capacitor; (3) exceeding the absolute maximum analog input voltage (typically VCC + 0.3V) on any CHx pin will damage the input ESD cell; (4) sampling rate higher than the family datasheet specifies will degrade linearity - always limit fCLK to within the rated range.
Информация о соответствии
RoHS compliance indicated by IWMX suffix per DigiKey listing. Not AEC-Q100 qualified - this part is intended for industrial and commercial applications, not automotive safety-critical use.
