ADC0838CCN/NOPB - 8-Bit Serial I/O ADC w/ 8-Ch MUX | TI
N.º da peça: ADC0838CCN/NOPB ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $5.42 | $5,42 |
| 10 | $4.78 | $47,80 |
| 100 | $4.12 | $412,00 |
| 500 | $3.65 | $1.825,00 |
| 1.000 | $3.21 | $3.210,00 |
ADC0838CCN/NOPB Visão geral
An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that resolves one bit per clock cycle using a binary-search algorithm against a precision DAC. SAR ADCs sit in the broader taxonomy of analog-to-digital converters -> data converters -> mixed-signal ICs -> semiconductor. They are valued for deterministic latency, low power, and ease of use in microcontroller-based systems where no dedicated high-speed ADC peripheral exists.
Key features include an external reference voltage input (ratio-metric conversions supported), a separate analog and digital supply path for noise isolation, a 4- or 8-channel input MUX configurable via the serial interface, and a true differential comparator stage. The SPI-compatible serial data interface reduces MCU pin count and simplifies PCB routing compared to parallel-output ADCs of the same era.
Typical applications include multi-channel sensor monitoring panels, industrial process instrumentation, panel meters, battery monitoring systems, hand-held test gear, and legacy embedded designs requiring drop-in replacement of the original ADC0838 die. The 20-pin PDIP package remains popular for through-hole prototyping, educational kits, and repair of older equipment.
When designing with the ADC0838, ensure the analog and digital supplies are decoupled with 0.1 µF ceramics placed close to the VCC and V+ pins, and respect the maximum source impedance of the analog inputs (per the datasheet typical-application section). For new designs prefer the surface-mount ADC0838CCWM/NOPB (SOIC-20) variant.
Alternativas drop-in para ADC0838CCN/NOPB — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ADC0838CCN/NOPB (mesmo formato e footprint) — diferindo em Architecture, Data Interface, Input Type, Operating Temperature, Number of Input Channels.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ADC0834CCN/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADC0838CCN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADC0838CCWM/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADC0838CCN/NOPB Classificações máximas e características elétricas
| Resolução | 8 bit |
| Taxa de amostragem | 31 kSPS (max) |
| Number of Inputs | 4 or 8 (configurable) |
| Input Type | Differential, Pseudo-Differential, Single-Ended |
| Data Interface | SPI (Serial) |
| Number of A/D Converters | 1 |
| Configuration | MUX-ADC |
| Reference Type | External |
| Supply Voltage - Analog | 4.5 V to 6.3 V |
| Supply Voltage - Digital | 4.5 V to 6.3 V |
| Temperatura de operação | -40 °C to +85 °C |
| Encapsulamento / Caixa | 20-DIP (0.300", 7.62 mm) |
| Supplier Device Package | 20-PDIP |
| Tipo de montagem | Through-Hole |
| Architecture | SAR (Successive Approximation Register) |
| RoHS / Pb-Free | Yes (/NOPB suffix) |
Configuração de pinos do ADC0838CCN/NOPB
| Pino 1 | V+ — Analog supply voltage (4.5 V to 6.3 V) |
| Pino 2 | CH0 — Analog input channel 0 |
| Pino 3 | CH1 — Analog input channel 1 |
| Pino 4 | CH2 — Analog input channel 2 |
| Pino 5 | CH3 — Analog input channel 3 |
| Pino 6 | CH4 — Analog input channel 4 |
| Pino 7 | CH5 — Analog input channel 5 |
| Pino 8 | CH6 — Analog input channel 6 |
| Pino 9 | CH7 — Analog input channel 7 |
| Pino 10 | GND — Analog and digital ground |
| Pino 11 | VREF — External reference voltage input |
| Pino 12 | CLK — Serial clock input |
| Pino 13 | DO — Serial data output |
| Pino 14 | DI — Serial data input (MUX address) |
| Pino 15 | /CS — Chip select (active low) |
| Pino 16 | VCC — Digital supply voltage (4.5 V to 6.3 V) |
| Pino 17 | NC — Not connected (per datasheet) |
| Pino 18 | NC — Not connected (per datasheet) |
| Pino 19 | NC — Not connected (per datasheet) |
| Pino 20 | NC — Not connected (per datasheet) |
Aplicações típicas
ADC0838CCN/NOPB é adequado para 6 aplicaçãos: Multi-Channel Sensor Monitoring Panel, Industrial Process Instrumentation, Hand-Held Digital Multimeter / Test Equipment, Battery Monitoring System (BMS) for Multi-Cell Packs, Legacy Through-Hole Embedded Controller Repair, Educational Lab Board and Microcontroller Trainer.
Multi-Channel Sensor Monitoring Panel
The ADC0838CCN/NOPB fits multi-sensor panels because it provides up to 8 multiplexed analog inputs in a single chip, allowing one converter to scan temperature, pressure, flow, and level transducers sequentially. The 31 kSPS throughput comfortably handles sub-1 kHz per-channel updates, and the 4.5 V to 6.3 V supply is compatible with 5 V transducer excitation. Used between the sensor bridge outputs and an MCU SPI bus with 0.1 µF decoupling; unlike an integrating ADC it offers deterministic latency, simplifying time-stamped logging. Pin-compatible SMD variant ADC0838CCWM/NOPB exists for higher-density boards.
Recomendado
Industrial Process Instrumentation
Process instruments such as panel meters, loop-powered transmitters, and weigh-scale readouts benefit from the ADC0838CCN/NOPB's 8-bit resolution and differential-input capability, which reject common-mode noise from 4-20 mA loops. The 5 V single-supply operation simplifies power-tree design, while the external reference allows ratio-metric ratiometric conversions against a precision 5.000 V reference. Placed between the analog front-end (INA128 or similar instrumentation amp) and the host MCU; provides 31 kSPS headroom over typical 10 Hz update rates, leaving room for fast transient capture.
Recomendado
Hand-Held Digital Multimeter / Test Equipment
Hand-held DMMs and battery-powered test gear use the ADC0838CCN/NOPB because it offers 4 or 8 channels at sub-mW quiescent consumption from a 5 V rail, extending battery life between charges. The serial SPI interface saves MCU pins, allowing smaller microcontrollers in compact housings. The 8-bit resolution is sufficient for coarse voltage, current, and resistance readouts in low-cost consumer test tools. Placed on a daughter PCB near the range-switch relays; unlike higher-resolution SARs it requires no special grounding or guard-ring layout, simplifying hand-held design.
Recomendado
Battery Monitoring System (BMS) for Multi-Cell Packs
Multi-cell battery monitors use the ADC0838CCN/NOPB to scan 4 to 8 individual cell voltages sequentially through a multiplexer, providing per-cell voltage telemetry for state-of-charge estimation. The differential input capability rejects ground bounce across long battery harnesses, and the 5 V supply is convenient for 4-cell Li-ion packs with cell voltages up to 4.2 V. Placed after the cell-balancing FETs and before the MCU; provides 31 kSPS throughput so even 8 cells at 1 kHz each leaves margin for additional temperature-sensor sweeps.
Recomendado
Legacy Through-Hole Embedded Controller Repair
Repairing legacy industrial controllers, scientific instruments, and educational kits requires a like-for-like through-hole part, and the ADC0838CCN/NOPB ships in a 20-pin PDIP that drops directly into the original ADC0838CCN socket. The /NOPB suffix adds a Pb-free finish, satisfying RoHS rework requirements while keeping the original through-hole footprint, standoffs, and wave-solder-compatible leads. Placed into the original ADC0838 socket; allows reuse of existing PCB, firmware, and front-panel design with zero hardware redesign versus the original ADC0838CCN.
Recomendado
Educational Lab Board and Microcontroller Trainer
University electronics labs and hobbyist microcontroller trainers use the ADC0838CCN/NOPB because its 20-pin PDIP form factor is breadboard-friendly and the serial interface can be bit-banged by any MCU for teaching ADC theory. The 8-bit resolution and 4- or 8-channel input make it a versatile teaching vehicle for SAR conversion, multiplexer scanning, and SPI protocol exercises. Placed on a trainer PCB with potentiometers and thermistor inputs; the through-hole package survives repeated insertion into solderless breadboards, unlike finer-pitch SMD alternatives.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ADC0838CCN/NOPB — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ADC0834CCN/NOPB | ADC0838CCN | ADC0838CCWM/NOPB |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-PDIP (0.300", 7.62 mm) | 20-PDIP (0.300", 7.62 mm) - same | 20-PDIP (0.300", 7.62 mm) - same | 20-SOIC wide - SMD land pattern (not PDIP) |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit |
| Sampling Rate | 31 kSPS | 31 kSPS | 31 kSPS | 31 kSPS |
| Number of Inputs | 4 or 8 | 2 or 4 (-50% to -75% vs 8) | 4 or 8 | 4 or 8 |
| Data Interface | SPI (Serial) | SPI (Serial) | SPI (Serial) | SPI (Serial) |
| Supply Voltage | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 4.5 V to 6.3 V |
| RoHS / Pb-Free | Yes (/NOPB) | Yes (/NOPB) | No (legacy lead finish) | Yes (/NOPB) |
| Mounting Type | Through-Hole (PDIP) | Through-Hole (PDIP) | Through-Hole (PDIP) | Surface Mount (SOIC-20) |
Principais diferenciais
- 8-channel MUX in 20-PDIP (vs ADC0834CCN/NOPB)
- RoHS-compliant Pb-free finish (vs ADC0838CCN (legacy))
- Through-hole PDIP form factor for legacy designs (vs ADC0838CCWM/NOPB (SOIC-20))
Notas de projeto
The ADC0838CCN/NOPB has separate analog (V+) and digital (VCC) supply pins both rated 4.5 V to 6.3 V. Place a 10 µF bulk capacitor at the board supply entry and a 0.1 µF ceramic decoupling cap within 5 mm of each of the V+ and VCC pins. Star-ground the analog and digital returns back at the regulator to prevent digital switching noise from corrupting conversions. If the analog front-end draws large transient currents, add a small ferrite bead between V+ and VCC to further isolate the analog reference from digital rail noise.
Route the analog input traces (CH0-CH7) as short as possible and keep them away from the serial-interface lines (CLK, DO, DI, /CS). Place a ground plane under the analog traces and ensure the reference voltage (VREF) is driven by a low-impedance buffer (e.g., an op-amp follower or a dedicated reference such as TL431). Avoid running digital signals directly over the analog input area on inner PCB layers, as capacitive coupling can introduce conversion errors. Estimated: 0.1 µF X7R ceramic on VREF within 3 mm of the pin keeps reference settling under 1 µs.
The ADC0838 serial interface is SPI-compatible but uses a custom MUX-address protocol on the DI pin during the first clock cycles. Drive CLK with a clean 50% duty-cycle waveform; ringing or excessive capacitance on CLK can cause the converter to latch incorrect MUX addresses. Source-terminate CLK with a 100 Ω resistor in series if the trace exceeds 50 mm. The DO pin is a totem-pole output; place a 100 kΩ pull-up if your MCU SPI peripheral requires a defined idle-high state, although the ADC0838 actively drives DO high between conversions.
Do not leave any analog input (CH0-CH7) floating; tie unused channels to ground through 10 kΩ to prevent the internal MUX from picking up noise. The /CS pin must be pulled high between conversions to allow the serial interface to reset. Do not exceed VREF above VCC + 0.3 V or below GND - 0.3 V, as the absolute-maximum ratings are tight on this legacy part. Finally, observe the maximum analog input source-impedance spec (typically 1 kΩ at 31 kSPS) - higher impedances cause integral-linearity errors due to the input sampling capacitor.
Informações de conformidade
RoHS compliance is provided by the /NOPB Pb-free matte-tin finish per TI part-numbering conventions. Halogen-free status was not in the verified data and is marked unknown. AEC-Q100 is not applicable - this is a commercial-grade part rated -40 °C to +85 °C, not an automotive-qualified converter.
