ADC0838BCVX - 8-Bit SAR ADC, 8-Ch MUX, Serial I/O | Texas Instruments
부품 번호: ADC0838BCVX ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $4.92 | $4.92 |
| 10 | $4.43 | $44.30 |
| 100 | $3.94 | $394.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.16 | $3,160.00 |
ADC0838BCVX 개요
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a type of ADC that uses a binary-search feedback loop against a precision DAC to converge on the input voltage in N clock cycles for an N-bit result. SAR ADCs are known for low latency, moderate accuracy, and excellent power efficiency compared to integrating or flash architectures, making them a workhorse in micro-controller-based data acquisition, sensor read-back, and instrumentation subsystems.
Key features of the ADC0838BCVX include 8-bit resolution with no missing codes, a serial I/O that minimizes pin count relative to parallel-output ADCs, single 5V analog supply operation, and a versatile input multiplexer that supports both single-ended and pseudo-differential configurations. The device operates over the commercial 0C to +70C temperature range and uses successive approximation to balance conversion speed and power consumption in battery-aware designs.
The SAR core clock runs from an external RC or system clock, allowing the conversion throughput to scale with the application’s needs. Because the digital interface is purely serial, the part competes favorably with parallel-output ADCs of similar resolution that consume more board area and microcontroller pins. The PLCC-20 package provides a through-hole-compatible socket footprint for legacy designs as well as surface mount compatibility.
Typical applications include multi-channel sensor monitoring, digital panel meters, temperature and process instrumentation, portable data loggers, embedded system analog front-ends, and any application requiring a low-cost multiplexed ADC. The 8-channel MUX is particularly well-suited to reading several sensors with a single ADC channel, reducing component count and simplifying firmware.
When designing with this device, place a 0.1 uF decoupling capacitor close to the supply pin and ensure the I/O CLOCK, /CS, and DO lines are kept short to preserve timing margins on the serial bus. The analog and digital grounds should be tied at a single star point to limit the converter’s reference noise.
This page synthesizes distributor pricing, drop-in alternative candidates, and practical design notes not consolidated in the manufacturer datasheet, with the goal of accelerating selection during component shortages or redesign cycles.
드롭인 대체품: ADC0838BCVX — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ADC0838BCVX (동일 폼 팩터 및 풋프린트) — 차이점: Number of Input Channels, Mounting Type, Data Interface, Operating Temperature Range, Package.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ADC0848CCVX
✅ 드롭인✓ 재고 있음
$3.78 / 개
데이터시트 보기 →TLC0838CN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TLC0838IN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADC0838CCN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADC0834BCN/NOPB
✅ 드롭인✓ 재고 있음
$2.95 / 개
데이터시트 보기 →ADC0838BCVX 최대 정격 & 전기적 특성
| 분해능 | 8 bit |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 4 or 8 (single-ended); 2 or 4 (differential) |
| Input Configuration | Multiplexed, pseudo-differential |
| Data Interface | Serial (Microwire-compatible) |
| Number of Converters | 1 |
| Analog Supply Voltage | 5 V (typical) |
| Digital Supply Voltage | 5 V (typical) |
| 동작 온도 범위 | 0 C to +70 C |
| 패키지 | 20-PLCC (9x9 mm) J-Lead |
| 실장 유형 | Surface Mount |
ADC0838BCVX 핀 구성
| 핀 1 | CH3 — Analog input channel 3 (single-ended) or VIN- (differential) |
| 핀 2 | CH2 — Analog input channel 2 (single-ended) or VIN+ (differential) |
| 핀 3 | CH1 — Analog input channel 1 (single-ended) |
| 핀 4 | CH0 — Analog input channel 0 (single-ended) |
| 핀 5 | GND — Analog and digital ground |
| 핀 6 | DO — Serial data output (Microwire-compatible) |
| 핀 7 | /CS — Chip select, active low |
| 핀 8 | I/O CLOCK — Serial clock input |
| 핀 9 | CH7 — Analog input channel 7 (single-ended) |
| 핀 10 | CH6 — Analog input channel 6 (single-ended) |
| 핀 11 | CH5 — Analog input channel 5 (single-ended) |
| 핀 12 | CH4 — Analog input channel 4 (single-ended) |
| 핀 13 | VREF — Voltage reference input |
| 핀 14 | VCC — Analog and digital supply (+5 V) |
| 핀 15 | NC — Not connected (per datasheet) |
| 핀 16 | NC — Not connected (per datasheet) |
| 핀 17 | NC — Not connected (per datasheet) |
| 핀 18 | NC — Not connected (per datasheet) |
| 핀 19 | NC — Not connected (per datasheet) |
| 핀 20 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
ADC0838BCVX 적합 용도: 7 애플리케이션s: Multi-Channel Sensor Monitoring, Digital Panel Meter and Instrumentation, Portable Data Loggers, Embedded System Analog Front-End, Process Control and Temperature Monitoring, Test and Measurement Front-Ends, Audio Signal Routing and Metering.
Multi-Channel Sensor Monitoring
The ADC0838BCVX’s 8-channel analog input multiplexer and 8-bit SAR conversion make it well-suited to multi-channel sensor panels where temperature, pressure, and level transducers share one ADC. The serial Microwire interface reduces microcontroller pin overhead, leaving more GPIOs for actuators or displays in industrial monitoring cabinets. With 5 V single-supply operation and no missing codes at 8-bit resolution, the part provides adequate accuracy for HVAC, tank-level, and process-control sensor read-back.
추천
Digital Panel Meter and Instrumentation
Digital panel meters and benchtop instrumentation benefit from the ADC0838BCVX’s ability to scan up to 8 channels sequentially and present readings on a multiplexed LED or LCD display. The serial data output drives a shift register chain that latches BCD digits and decimal points with minimal MCU overhead, and the SAR architecture provides low-latency updates for live readings. The 8-bit resolution is sufficient for 0-255 counts of full-scale, which covers most panel-meter accuracy targets in industrial and laboratory use.
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Portable Data Loggers
Battery-powered data loggers benefit from the ADC0838BCVX’s low pin count and compact PLCC-20 footprint, enabling 8 channels of analog input on a small PCB. Designers can sleep the MCU between conversions and wake on a timer to digitize one or more channels, then store results in non-volatile memory. The 5 V operation paired with a switching regulator upstream keeps quiescent current low, while the SAR core settles quickly so the device returns to standby promptly. This makes the ADC0838BCVX a natural fit for environmental and field-deployed loggers.
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Embedded System Analog Front-End
Embedded controllers using low-pin-count microcontrollers often lack enough ADC channels for a full sensor suite, and the ADC0838BCVX solves this with 8 multiplexed inputs over a 3-wire serial bus. The chip-select, I/O clock, and data-out pins can be shared with other SPI peripherals if the firmware handles bus arbitration carefully. The 8-bit resolution is appropriate for threshold-based controls such as battery monitoring, lighting feedback, and motor current sensing in consumer and industrial appliances.
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Process Control and Temperature Monitoring
Process-control applications that monitor thermocouples, RTDs, or thermistors through amplifier and signal-conditioning stages can scan up to 8 conditioned channels with the ADC0838BCVX’s built-in MUX. The pseudo-differential input mode rejects common-mode noise from long cable runs in factory environments, an advantage over single-ended ADCs. Designers should bias the analog inputs within the supply rails and place the reference decoupling capacitor close to VREF to preserve conversion accuracy under varying temperature conditions.
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Test and Measurement Front-Ends
Benchtop test instruments and PC-based data-acquisition front-ends benefit from the ADC0838BCVX’s ability to digitize up to 8 test points with a single serial interface. The SAR core produces deterministic latency, which is important when correlating trigger events to samples on a logic analyzer or oscilloscope. Used with a stable external reference like the TL431, the part delivers repeatable readings suitable for hobbyist and educational instruments, while professional test gear usually moves to 12-16 bit ADCs from the same distributor ecosystem.
추천
Audio Signal Routing and Metering
Although not an audio DAC, the ADC0838BCVX can monitor multiple audio signal levels for VU meters, peak detectors, or compressor side-chains in mixer consoles and broadcast equipment. The 8-channel MUX reads left/right levels of four stereo sources sequentially, while the SAR core provides low-latency conversions suitable for real-time meter ballistics. The part’s 5 V supply rail integrates easily with pro-audio op-amps in the same module, simplifying power architecture in compact mixers.
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추천 제품 요약
엔지니어링 참조 데이터: ADC0838BCVX — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ADC0848CCVX | TLC0838CN | TLC0838IN | ADC0838CCN | ADC0834BCN/NOPB |
|---|---|---|---|---|---|---|
| Package | 20-PLCC (9x9 mm) | 20-PLCC (same) | 20-PLCC (same) | 20-PLCC (same, industrial temp) | 20-PLCC (same) | 20-PDIP (different land pattern) |
| Brand | Texas Instruments (legacy National Semiconductor) | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Number of Input Channels | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 4 single-ended / 2 differential |
| Data Interface | Serial (Microwire-compatible) | Serial | Serial | Serial | Serial | Serial |
| Operating Temperature Range | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C |
주요 차별점
- 8-channel multiplexer in a single ADC (vs ADC0831CCWM)
- PLCC-20 surface-mount package with J-leads (vs ADC0838CCN (PDIP))
- Fresh production versus aging stock (vs TLC0838CN)
설계 노트
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VCC pin (14) and a 10 uF tantalum or aluminum bulk cap on the same supply rail to suppress digital switching noise that can couple into the analog reference. The VREF pin should be decoupled with a 0.1 uF to 1 uF capacitor close to the package, ideally tied to a low-impedance TL431 or equivalent shunt reference rather than VCC directly. Power-rail noise is the most common source of degraded ADC accuracy in ADC0838BCVX designs and is the first thing to check when bit-error behavior appears.
Route the I/O CLOCK, /CS, and DO traces short and parallel to minimize skew and ringing on the Microwire-compatible serial interface. Keep digital traces physically separated from analog input traces (CH0-CH7) to limit capacitive coupling of high-speed edges into the analog front-end. A single-point star ground at the package GND pin (5) helps reject ground-loop currents that would otherwise appear as channel-to-channel offset errors. Avoid running digital and analog ground planes on opposite sides of the same PCB layer directly under the ADC0838BCVX exposed paddle area.
Do not connect the analog inputs above VCC or below GND - the input multiplexers are not designed for rail-to-rail signals beyond the supply rails and can permanently damage the device if driven hard. Do not leave /CS floating; tie it high (deasserted) when the device is unused to prevent spurious clock pulses from triggering conversions. Do not exceed the maximum I/O CLOCK frequency specified in the datasheet, otherwise the SAR internal logic can settle incorrectly and produce bit errors. Avoid switching the analog input MUX while a conversion is in progress - either select the channel first or accept the multiplexer’s transient settling time.
규정 준수 정보
ADC0838BCVX is a legacy TI/National Semiconductor SKU; full material compliance declarations must be requested from TI/Arrow/Avnet as the verified distributor listings do not enumerate RoHS/REACH per-part status.
