ADC0844CCN/NOPB - 8-Bit 4-Ch SAR ADC, 25ksps, 20-PDIP | TI
N.º da peça: ADC0844CCN/NOPB ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $9.5 | $9,50 |
| 10 | $8.55 | $85,50 |
| 100 | $7.6 | $760,00 |
| 500 | $6.85 | $3.425,00 |
| 1.000 | $6.05 | $6.050,00 |
ADC0844CCN/NOPB Visão geral
An SAR ADC is a type of data converter that uses a binary search algorithm implemented with a capacitive DAC and a comparator to resolve one bit per clock cycle. SAR converters offer deterministic latency, low power, and excellent DC accuracy for moderate-speed precision measurements. ADC0844 sits within the data-converter IC family in the broader signal-chain hierarchy of analog->conditioning->conversion->processor, and bridges real-world sensors to microprocessors or microcontrollers.
Key features of the ADC0844 include 4 software-configurable analog input channels, an on-chip track-and-hold, ratiometric conversion that eliminates the need for an external precision reference, a microprocessor-compatible parallel interface with chip-select and read/write controls, and a maximum ±0.39% (1 LSB) linearity error. The 4/8-channel multiplexer can be set up as single-ended, differential, or pseudo-differential inputs without external signal conditioning.
The device's architecture uses a successive approximation register with an internal 256R resistor ladder. The reference input can be tied to the analog supply for direct ratiometric transducer measurements (potentiometers, strain gauges, thermistors) or to a precision external reference for absolute accuracy. The /CS, /RD, /WR, and /INT control the conversion sequence and allow easy interface to most 8-bit microprocessors.
Typical applications include process-control instrumentation, portable data loggers, multi-channel sensor front-ends, panel meters, and embedded measurement boards. Its parallel bus and 4-channel mux make it a natural fit for legacy 8051/PIC/HC11 designs that need multi-channel analog without an external analog MUX.
When designing with this part, observe proper PCB layout: keep analog and digital grounds separated and joined at a single point near the ADC ground pin. Add a 0.01uF bypass capacitor close to the VCC pin and a 0.1uF capacitor near the reference input to minimize digital switching noise coupling into the conversion result.
Alternativas drop-in para ADC0844CCN/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 ADC0844CCN/NOPB (mesmo formato e footprint) — diferindo em Architecture, Data Interface, Sampling Rate, Input Type, Number of Input Channels.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ADC0848CCN/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADC0844CCN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADC0834BCN/NOPB
✅ Drop-In✓ Em estoque
$2.95 / unidade
Ver ficha técnica →ADC0838CCN/NOPB
✅ Drop-In✓ Em estoque
$3.21 / unidade
Ver ficha técnica →ADC0844CCJ
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ADC0844BCN/NOPB
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ADC0844CCN/NOPB Classificações máximas e características elétricas
| Resolução | 8 bit |
| Number of Channels | 4 |
| Conversion Type | SAR (Successive Approximation) |
| Taxa de amostragem | 25 ksps |
| Input Configuration | Single-Ended / Differential / Pseudo-Differential |
| Analog Supply Voltage | 4.5 V to 6.0 V |
| Digital Supply Voltage | 4.5 V to 6.0 V |
| Faixa de tensão de entrada | 0 V to VREF (single-ended) |
| Reference Input Resistance | 1.1 kohm minimum |
| Linearity Error (Max) | ±0.39% (1 LSB) |
| Interface | Parallel (8-bit) with /CS, /RD, /WR, /INT |
| Temperatura de operação | 0C to +70C (commercial) |
| Encapsulamento | 20-pin PDIP (N) |
| Tipo de montagem | Through-Hole |
| Status RoHS | Compliant (NOPB suffix) |
Configuração de pinos do ADC0844CCN/NOPB
| Pino 1 | CH0 — Analog input channel 0 |
| Pino 2 | CH1 — Analog input channel 1 |
| Pino 3 | CH2 — Analog input channel 2 |
| Pino 4 | CH3 — Analog input channel 3 |
| Pino 5 | VREF — Voltage reference input |
| Pino 6 | VCC — Analog +5V supply |
| Pino 7 | GND — Analog ground |
| Pino 8 | DB0 — Digital output bit 0 (LSB) |
| Pino 9 | DB1 — Digital output bit 1 |
| Pino 10 | DB2 — Digital output bit 2 |
| Pino 11 | DB3 — Digital output bit 3 |
| Pino 12 | DB4 — Digital output bit 4 |
| Pino 13 | DB5 — Digital output bit 5 |
| Pino 14 | DB6 — Digital output bit 6 |
| Pino 15 | DB7 — Digital output bit 7 (MSB) |
| Pino 16 | /CS — Chip select (active low) |
| Pino 17 | /RD — Read strobe (active low) |
| Pino 18 | /WR — Write strobe (active low) |
| Pino 19 | /INT — Interrupt output (active low) |
| Pino 20 | CLK IN — Clock input |
Aplicações típicas
ADC0844CCN/NOPB é adequado para 6 aplicaçãos: Process Control Instrumentation, Portable Data Loggers, Multi-Channel Sensor Front-Ends, Digital Panel Meters, Legacy Embedded Measurement Boards, Industrial Automation I/O Modules.
Process Control Instrumentation
The ADC0844CCN/NOPB is well-suited for process-control panels where 4 channels of sensor data (temperature, pressure, flow, level) must be digitized for a PLC or HMI. The 25 ksps sampling rate easily handles typical 1-100 Hz transducer signals, while the 4-channel on-chip mux eliminates the need for an external analog MUX. The 8-bit parallel interface connects directly to legacy 8051 or PIC microcontrollers common in factory equipment. The ratiometric conversion feature ties VREF to the sensor excitation supply, automatically cancelling excitation drift for accurate bridge transducer readings.
Recomendado
Portable Data Loggers
Battery-powered data loggers benefit from the ADC0844CCN/NOPB's single +4.5V to +6.0V supply operation and CMOS low-power SAR design. Typical active supply current is approximately 1 mA per the TI datasheet - not in the recommended low-power range - so duty-cycling the conversions keeps average consumption low. The 4-channel mux allows logging of multiple environmental sensors (thermistor, humidity, light) through a single converter. The on-chip track-and-hold simplifies the analog front-end for slow-moving signals typical in environmental monitoring applications.
Recomendado
Multi-Channel Sensor Front-Ends
Embedded sensor boards reading multiple analog transducers benefit from the ADC0844CCN/NOPB's 4 input channels and parallel 8-bit interface. Each channel can be configured as single-ended, differential, or pseudo-differential without external signal conditioning. The SAR architecture provides deterministic conversion latency (one fixed number of clock cycles per conversion), which simplifies timing analysis in real-time sensor fusion firmware. The 20-pin PDIP through-hole package also suits hobbyist and prototyping applications where through-hole soldering is preferred over SMD.
Recomendado
Digital Panel Meters
Digital panel meters and bench instruments commonly integrate the ADC0844CCN/NOPB for its 4-channel capability and easy parallel interface to display-driver MCUs. The ratiometric conversion eliminates the need for an external precision reference when measuring potentiometric or bridge-type sensors, reducing BOM cost and calibration effort. The 25 ksps sampling rate is overkill for panel-meter update rates of 1-10 Hz, providing high noise averaging headroom. The commercial 0°C to +70°C temperature range covers indoor panel-meter operating environments.
Recomendado
Legacy Embedded Measurement Boards
Legacy 8051, HC11, and PIC-based measurement boards leverage the ADC0844CCN/NOPB's parallel 8-bit interface and memory-mapped read/write control. The /CS, /RD, /WR, /INT signals map directly to standard 8-bit microprocessor bus cycles, allowing the ADC to occupy a memory-mapped I/O address range with minimal glue logic. The 4-channel mux simplifies firmware by allowing sequential channel registration through the MUX address bus rather than channel-switching I/O expander chips.
Recomendado
Industrial Automation I/O Modules
Industrial I/O modules measuring 4-20 mA or 0-10 V field signals benefit from the ADC0844CCN/NOPB's differential input capability and ratiometric operation. Pseudo-differential mode allows rejection of common-mode ground offsets between the field wiring and the module's local ground - critical for industrial installations with long cable runs. The ±0.39% (1 LSB) linearity error suits general-purpose process monitoring where 1% accuracy is acceptable. The commercial-grade 0°C to 20°C range covers indoor industrial enclosure environments.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ADC0844CCN/NOPB — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ADC0848CCN/NOPB | ADC0844CCN | ADC0834BCN/NOPB | ADC0838CCN/NOPB | ADC0844CCJ | ADC0844BCN/NOPB |
|---|---|---|---|---|---|---|---|
| Package | 20-PDIP (N) | 20-PDIP (N) - same | 20-PDIP (N) - same | 20-PDIP (N) - same | 20-PDIP (N) - same | 20-PDIP (N) - same | 20-PDIP (N) - same |
| Brand | Texas Instruments | 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 | 8 bit |
| Number of Channels | 4 | 8 | 4 | 4 | 8 | 4 | 4 |
| Sampling Rate | 25 ksps | 25 ksps | 25 ksps | 25 ksps | 25 ksps | 25 ksps | 25 ksps |
| Digital Interface | Parallel (8-bit) | Parallel (8-bit) | Parallel (8-bit) | Serial MICrowire | Serial MICrowire | Parallel (8-bit) | Parallel (8-bit) |
| Supply Voltage | 4.5V to 6.0V | 4.5V to 6.0V | 4.5V to 6.0V | 4.5V to 6.0V | 4.5V to 6.0V | 4.5V to 6.0V | 4.5V to 6.0V |
| Linearity Error | ±0.39% (1 LSB) | ±0.39% (1 LSB) | ±0.39% (1 LSB) | ±0.39% (1 LSB) | ±0.39% (1 LSB) | ±0.39% (1 LSB) | Tighter (improved linearity grade) |
| RoHS Compliant | Yes (NOPB) | Yes (NOPB) | No (no NOPB) | Yes (NOPB) | Yes (NOPB) | No (no NOPB) | Yes (NOPB) |
Principais diferenciais
- 4-channel on-chip mux eliminates external MUX hardware (vs ADC0808 (external-mux 8-bit ADC))
- Parallel 8-bit bus interface for high-throughput direct CPU access (vs ADC0834BCN/NOPB (serial MICrowire))
- Ratiometric conversion eliminates need for external precision reference (vs External-precision-reference ADC designs)
Notas de projeto
Route the analog and digital grounds as separate traces that join at a single point near the ADC0848 GND pin (pin 7). Avoid running digital outputs (DB0-DB7) directly over the analog input traces or near the VREF pin to minimize digital switching noise coupling into the analog signal path. Place the 0.01uF and 0.1uF VCC bypass capacitors as close as physically possible to the VCC pin. The reference input pin (pin 5) must have a 0.1uF bypass capacitor within 5 mm of the pin.
Do not leave the /CS pin floating - tie it to logic high through a pull-up resistor to avoid spurious conversions. The /INT pin must be pulled high with a 10kohm pull-up to VCC; do not leave it floating or you will observe intermittent interrupts. When using the on-chip mux in differential or pseudo-differential configuration, both inputs must share a common-mode voltage within the input range specified by the TI datasheet - otherwise the converter will produce off-scale readings.
For ratiometric transducer measurements (potentiometers, strain gauges, thermistors), tie VREF directly to the transducer excitation supply. This automatic cancellation of supply drift is one of the ADC0844's key advantages. For absolute voltage measurements, use a precision external reference such as the TI REF02 or REF5050 to achieve better than ±0.5 LSB absolute error. Drive the reference pin with a low-impedance buffer if the source impedance exceeds the datasheet minimum of 1.1 kohm.
Informações de conformidade
NOPB suffix indicates lead-free (Pb-free) and RoHS-compliant packaging. AEC-Q100 not applicable for commercial-temperature-grade ADC. Halogen-free status not explicitly stated in source data - marked unknown per Data Authenticity Rules.
