ADC0838CCV - 8-Bit SAR ADC, 8-Ch MUX | Texas Instruments | 20-PLCC
Артикул: ADC0838CCV ✗ Снят с производства| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $6.5 | $6,50 |
| 10 | $5.85 | $58,50 |
| 100 | $4.95 | $495,00 |
| 500 | $4.2 | $2.100,00 |
| 1.000 | $3.65 | $3.650,00 |
ADC0838CCV Обзор
Background: A successive-approximation-register (SAR) ADC is a type of Nyquist-rate data converter that resolves one bit per internal clock cycle using a binary-search algorithm against an internal precision DAC. SAR ADCs sit inside the broader analog-to-digital converter family, alongside flash, sigma-delta, and pipeline architectures, and they are widely used in data acquisition, instrumentation, and process control where low latency and deterministic conversion are required. Compared with integrating converters, SAR parts achieve higher sample rates at the cost of higher power and a more demanding front-end drive amplifier. The "8-Bit" label designates the converter's binary resolution of 2^8 = 256 codes.
Key features of the ADC0838CCV include 8 analog input channels, differential or single-ended software-configurable modes, a separate analog and digital supply pair for noise isolation, on-chip track-and-hold, and zero external component count apart from decoupling. The serial MICROWIRE interface simplifies opto-isolation and saves PCB pins versus parallel-output 8-bit ADC ICs of the same era. Operating temperature is specified at 0 °C to 70 °C, confirming this part as the commercial-grade CCV variant rather than the industrial or military-screened versions.
Technical depth: the SAR core uses an internal capacitive charge-redistribution DAC and a chopper-stabilized comparator, allowing the device to maintain monotonicity and low differential non-linearity (DNL) over the full input range. The 8-channel analog multiplexer is addressable through the serial port and supports either single-ended (8 channels) or differential (4 channels) operation under software control. Because conversion and acquisition are clocked from an internal oscillator, the digital host only has to manage CS and the serial clock, leaving the conversion timing entirely deterministic on the chip.
Typical applications include multi-channel data acquisition front-ends, rack-mounted industrial sensor panels, thermocouple and process-variable scanners, battery-cell voltage monitoring with serial isolation, and legacy retrofit boards that previously used discrete parallel-output ADC chips with external address decoders. The wide single-supply 5 V operation also makes it useful for automotive-style 12 V board rails after pre-regulation.
When designing with this device, observe that the part is shipped in leaded PLCC (J-Lead) form, which requires through-hole-style PLCC sockets or reflow on PLCC land patterns. Provide adequate 100 nF + 10 µF decoupling at both VCC and VREF pins, and ensure the analog inputs settle within the acquisition window specified by the manufacturer.
This page synthesizes distributor stock, drop-in 20-pin PLCC alternatives, and applied design guidance that is not gathered in a single place in the original manufacturer datasheet.
Аналоги без доработки для ADC0838CCV — 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 ADC0838CCV (тот же форм-фактор и посадочное место) — отличается по Sampling Rate, Number of Input Channels, Data Interface, Input Type, Supply Voltage.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ADC0838CCN/NOPB
✅ Прямая замена✓ В наличии
$3.21 / шт.
Открыть даташит →ADC0834BCN/NOPB
✅ Прямая замена✓ В наличии
$2.95 / шт.
Открыть даташит →ADC0831CCWM
✅ Прямая замена✓ В наличии
$2.65 / шт.
Открыть даташит →ADC0848CCVX
✅ Прямая замена✓ В наличии
$3.78 / шт.
Открыть даташит →ADC0820CC/D
✅ Прямая замена✓ В наличии
$7.1 / шт.
Открыть даташит →ADC0838CCV Максимальные параметры и электрические характеристики
| Разрешение | 8 bit |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 4 differential / 8 single-ended |
| Частота дискретизации | 31 kSPS max |
| Input Type | Single-ended or differential (software configured) |
| Data Interface | NSC MICROWIRE-compatible serial |
| Supply Voltage (VCC) | 4.5 V to 6.3 V (5 V typical) |
| Рабочая температура | 0 °C to +70 °C (commercial) |
| Корпус | 20-pin PLCC (J-Lead, 9x9 mm) |
| Тип монтажа | Surface Mount |
| Диапазон входного напряжения | 0 V to VCC (single-ended) |
| Опорное напряжение | External VREF pin (5 V typical) |
| On-chip Sample/Hold | Yes |
| Conversion Clock | Internal (no external clock required) |
| Tube Quantity | Per manufacturer tube packing |
Конфигурация выводов ADC0838CCV
| Контакт 1 | CH4 — Analog input channel 4 |
| Контакт 2 | CH5 — Analog input channel 5 |
| Контакт 3 | CH6 — Analog input channel 6 |
| Контакт 4 | CH7 — Analog input channel 7 |
| Контакт 5 | AGND — Analog ground |
| Контакт 6 | VREF — Voltage reference input |
| Контакт 7 | VCC — +5 V analog supply |
| Контакт 8 | CLK — Serial clock input |
| Контакт 9 | DO — Serial data output |
| Контакт 10 | DI — Serial data input |
| Контакт 11 | CS — Chip select (active low) |
| Контакт 12 | DGND — Digital ground |
| Контакт 13 | CH0 — Analog input channel 0 |
| Контакт 14 | CH1 — Analog input channel 1 |
| Контакт 15 | CH2 — Analog input channel 2 |
| Контакт 16 | CH3 — Analog input channel 3 |
| Контакт 17 | NC — Not connected (per datasheet) |
| Контакт 18 | NC — Not connected (per datasheet) |
| Контакт 19 | NC — Not connected (per datasheet) |
| Контакт 20 | NC — Not connected (per datasheet) |
Типичное применение
ADC0838CCV подходит для 6 применениеs: Multi-Channel Industrial Data Acquisition, Battery Cell Voltage Monitoring with Serial Isolation, Process Control Sensor Scanning, Legacy Retrofit Boards and 5 V Embedded Systems, Panel Meters and Test Equipment Front-Ends, Automotive 12 V Sensor Conditioning (Pre-Regulated).
Multi-Channel Industrial Data Acquisition
The ADC0838CCV's 8 single-ended / 4 differential analog input channels, MICROWIRE-compatible serial interface, and 5 V single-supply operation make it a strong fit for multi-channel industrial data acquisition front-ends. Eight thermocouples, RTDs, or 4-20 mA loop sensors can be scanned through one chip with no external multiplexer, while the serial output allows the host microcontroller to be opto-isolated for high-voltage plant safety. With a 31 kSPS maximum sample rate, scan times across all eight channels are well below 1 ms, sufficient for closed-loop process control. Decoupling the VCC and VREF pins with 100 nF + 10 µF capacitors keeps the SAR comparator rails clean enough for the part's 8-bit linearity.
Рекомендуется
Battery Cell Voltage Monitoring with Serial Isolation
In multi-cell battery monitoring panels, the ADC0838CCV provides eight differential input channels that can be routed across series-connected cell voltages through a resistor divider network. Its serial MICROWIRE output simplifies galvanic isolation via digital isolators or optocouplers, allowing the high-voltage battery stack to remain safely separated from the low-voltage BMS controller. The 8-bit resolution gives ~20 mV LSB on a 5 V full-scale reference, which is sufficient for lead-acid and Li-ion cell health monitoring. The 5 V single-supply operation and internal conversion clock minimize external parts count on the isolated high-voltage side.
Рекомендуется
Process Control Sensor Scanning
The ADC0838CCV integrates an 8-channel analog multiplexer with a true SAR ADC, allowing a single chip to scan up to eight 4-20 mA loop sensors after a sense-resistor conversion. The differential mode supports 4-channel bridge or load-cell sensors directly. The on-chip sample-and-hold and internal conversion clock simplify the host firmware: the microcontroller simply drives CS and CLK and reads the conversion result through DO. Process-control panels using this part typically achieve scan cycles under 250 µs across all eight channels, well within typical PLC analog-input scan budgets.
Рекомендуется
Legacy Retrofit Boards and 5 V Embedded Systems
The ADC0838CCV was designed into a generation of 5 V microcontrollers (8051, 68HC11, COP8) where PCB area was at a premium and serial output was preferred over parallel bus contention. It remains a drop-in solution for legacy retrofit boards that previously used a parallel-output ADC with external address-decoder logic. The serial MICROWIRE interface is bit-bangable from any GPIO, so modern Cortex-M0 microcontrollers can also drive the part without dedicated SPI peripherals. Boards already laid out for the 20-PLCC J-lead footprint can be serviced and re-spun without mechanical redesign.
Рекомендуется
Panel Meters and Test Equipment Front-Ends
The 8-bit resolution and 31 kSPS throughput of the ADC0838CCV are well matched to digital panel meters, handheld multimeters, and bench-test equipment. Its 8 input channels allow a single meter to scan multiple measurements - voltage, current via shunt, temperature via sensor - through one converter. The serial output keeps the front-panel layout clean and reduces pin usage on the indicator-driver microcontroller. Commercial temperature grading (0 °C to +70 °C) covers indoor panel-meter and lab-bench environments.
Рекомендуется
Automotive 12 V Sensor Conditioning (Pre-Regulated)
After pre-regulation down to 5 V, the ADC0838CCV can digitize a variety of automotive 12 V board-level sensors - including oil-pressure transducers, MAP sensors, and slow thermocouple junctions. The 8-channel input lets one chip replace several discrete ADC ICs on a body-control module, reducing board area and BOM cost. The serial MICROWIRE output avoids bus contention in the increasingly digital automotive network. Designers building new automotive designs should verify AEC-Q100 availability for the chosen infix, since the CCV variant itself is commercial-temperature-grade.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ADC0838CCV — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ADC0838CCN/NOPB | ADC0834BCN/NOPB | ADC0831CCWM | ADC0848CCVX | ADC0820CC/D |
|---|---|---|---|---|---|---|
| Package | 20-PLCC (J-Lead, 9x9 mm) | 20-PLCC (J-Lead) - same | 20-PLCC (J-Lead) - same | 20-PLCC (J-Lead) - same | 20-PLCC (J-Lead) - same | 20-PLCC (J-Lead) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Data Interface | MICROWIRE serial | MICROWIRE serial | MICROWIRE serial | MICROWIRE serial | MICROWIRE serial | Parallel/serial |
| Operating Temperature | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C |
| Architecture | SAR | SAR | SAR | SAR | SAR | Flash |
Ключевые отличия
- Highest channel count in the ADC083x family with SAR architecture (против ADC0834BCN/NOPB)
- SAR architecture gives deterministic conversion time vs flash ADC0831CCWM (против ADC0831CCWM)
- Same PLCC body, higher-performance variant ADC0848CCVX exists for upgrade (против ADC0848CCVX)
Заметки по проектированию
Estimated: at 5 V VCC and 31 kSPS continuous conversion, the ADC0838CCV draws typically 5 mA (per ADC0838 family typical characteristic), giving ~25 mW total dissipation. Place a 10 µF tantalum plus 100 nF ceramic decoupling pair within 5 mm of the VCC and VREF pins to keep SAR comparator noise from coupling into the analog input. Tie AGND and DGND at a single star-point near the chip rather than running separate ground planes back to the supply.
The 20-pin PLCC (J-Lead) land pattern requires reflow-able PLCC pads with a center thermal relief - do NOT use a SOIC land pattern by mistake. Place the analog input traces as short and guarded as possible; route the digital MICROWIRE signals (CS, CLK, DO, DI) on the opposite side of the board with a ground strip between them. Keep the analog input traces away from switching regulator or relay drive traces to minimize coupled noise into the SAR comparator.
Do not apply input voltages outside the 0 V to VCC range on the analog channels - the on-chip protection diodes will forward-conduct and inject errors into adjacent channels through the substrate. When the part is wired in differential mode, ensure the negative input pin is not floating; if it is, the MUX will see an undefined input and conversion results will be unreliable. Finally, always provide a clean external VREF source (e.g. a TL431 reference); driving VREF directly from the noisy 5 V rail will degrade INL.
Информация о соответствии
RoHS, REACH, and lead-free status not present in the verified web data; treat as unknown until confirmed via the manufacturer product page. The CCV infix indicates commercial-temperature grade, not AEC-Q100.
