AD7685BCPZ - 16-Bit 250kSPS PulSAR ADC | Analog Devices
N.º da peça: AD7685BCPZ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $12.5 | $12,50 |
| 10 | $11.25 | $112,50 |
| 100 | $9.8 | $980,00 |
| 500 | $8.9 | $4.450,00 |
| 1.000 | $8.1 | $8.100,00 |
AD7685BCPZ Visão geral
A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm to convert an analog input into a digital output. It employs a charge redistribution capacitor array to perform the conversion, offering a balance of speed, resolution, and power consumption. SAR ADCs are widely used in applications requiring high accuracy and moderate sampling rates, such as industrial process control, medical instrumentation, and portable battery-powered devices.
Key features of the AD7685BCPZ include 16-bit resolution with no missing codes, a 250 kSPS sampling rate, and a low power consumption of typically 3.5 mW at 5 V supply. The device also features a pseudo-differential input, an SPI-compatible serial interface, and a power-down mode for energy savings. The LFCSP package provides excellent thermal performance and a small footprint, enabling high-density PCB layouts.
The AD7685 uses a charge redistribution architecture with an internal track-and-hold circuit, ensuring accurate sampling of the input signal. The device includes a precision reference input that can be driven by an external reference, allowing flexibility in system design. The SPI interface supports daisy-chaining of multiple ADCs, simplifying multi-channel data acquisition systems.
Typical applications include battery-powered instrumentation, data acquisition systems, industrial process control, and medical devices. The AD7685's low power and high accuracy make it suitable for portable and remote sensing applications where power efficiency is critical.
When designing with the AD7685BCPZ, ensure a clean analog supply and a stable reference voltage to achieve optimal performance. Proper PCB layout with adequate decoupling and grounding is essential to minimize noise and maximize SNR.
Alternativas drop-in para AD7685BCPZ — 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 AD7685BCPZ (mesmo formato e footprint) — diferindo em Sampling Rate, Input Type, Resolution, Package, Supply Voltage.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
AD7685BCPZ-R2
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD7685BCPZRL7
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD7690BCPZRL7
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$17.6 / unidade
Ver ficha técnica →AD7980BCPZ-RL7
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$18 / unidade
Ver ficha técnica →AD7980BCPZ-RL7
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$18 / unidade
Ver ficha técnica →AD7685BCPZ Classificações máximas e características elétricas
| Resolução | 16 bits |
| Taxa de amostragem | 250 kSPS |
| Input Type | Pseudo-differential |
| Tensão de alimentação | 2.3 V to 5.5 V |
| Power Consumption | 3.5 mW at 5 V |
| Interface | SPI |
| Encapsulamento | 10-LFCSP-WD (3x3 mm) |
| Temperatura de operação | -40C to +125C |
| No Missing Codes | Yes |
| Tensão de referência | External, 0.5V to VDD |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
Configuração de pinos do AD7685BCPZ
| Pino 1 | VDD — Power supply, 2.3V to 5.5V |
| Pino 2 | GND — Ground |
| Pino 3 | REF — Reference input, external |
| Pino 4 | IN+ — Positive analog input |
| Pino 5 | IN- — Negative analog input |
| Pino 6 | SDO — Serial data output |
| Pino 7 | SCK — Serial clock input |
| Pino 8 | CS — Chip select, active low |
| Pino 9 | PD — Power down, active high |
| Pino 10 | EP — Exposed pad, connect to GND |
Aplicações típicas
AD7685BCPZ é adequado para 6 aplicaçãos: Battery-Powered Instrumentation, Data Acquisition Systems, Industrial Process Control, Medical Instrumentation, Portable Test Equipment, Sensor Signal Conditioning.
Battery-Powered Instrumentation
The AD7685BCPZ's low power consumption (3.5 mW at 5 V) and wide supply range (2.3 V to 5.5 V) make it ideal for portable instruments. Its 16-bit resolution ensures accurate measurements, while the small LFCSP package saves board space. The SPI interface simplifies connection to low-power microcontrollers, and power-down modes extend battery life in duty-cycled applications.
Recomendado
Data Acquisition Systems
The AD7685BCPZ provides 16-bit resolution at 250 kSPS, making it suitable for multi-channel data acquisition systems. Its pseudo-differential input rejects common-mode noise, and the SPI interface supports daisy-chaining for multiple channels. The device's low power and small footprint enable high-density designs in industrial and laboratory equipment.
Recomendado
Industrial Process Control
In industrial process control, the AD7685BCPZ offers the accuracy and speed needed for monitoring sensors and actuators. Its 16-bit resolution ensures precise control, while the wide supply range accommodates various industrial power rails. The device's robust operating temperature range (-40C to +125C) suits harsh environments, and the SPI interface integrates easily with industrial microcontrollers.
Recomendado
Medical Instrumentation
The AD7685BCPZ is well-suited for medical devices such as patient monitors and diagnostic equipment. Its low power consumption is critical for battery-operated devices, and the 16-bit resolution provides the accuracy required for vital sign measurements. The compact LFCSP package allows miniaturization, and the SPI interface enables easy integration with medical-grade microcontrollers.
Recomendado
Portable Test Equipment
For portable test equipment like handheld multimeters and data loggers, the AD7685BCPZ offers a balance of performance and power efficiency. Its 250 kSPS sampling rate is sufficient for many test applications, and the low power consumption extends battery life. The small package and SPI interface make it easy to design into compact, battery-powered devices.
Recomendado
Sensor Signal Conditioning
The AD7685BCPZ is ideal for conditioning signals from sensors such as temperature, pressure, and strain gauges. Its 16-bit resolution captures fine sensor variations, and the pseudo-differential input helps reject noise. The device's low power and small size are advantageous in distributed sensor networks, and the SPI interface allows easy connection to sensor hub microcontrollers.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para AD7685BCPZ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | AD7685BCPZ-R2 | AD7685BCPZRL7 | AD7690BCPZRL7 | AD7980BCPZ-RL7 |
|---|---|---|---|---|---|
| Package | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 400 kSPS | 1 MSPS |
| Supply Voltage | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V |
| Interface | SPI | SPI | SPI | SPI | SPI |
| Input Type | Pseudo-differential | Pseudo-differential | Pseudo-differential | Pseudo-differential | Pseudo-differential |
Principais diferenciais
- Low power consumption of 3.5 mW at 5V (vs AD7980BCPZ)
- 250 kSPS sampling rate (vs AD7690BCPZRL7)
- Small 10-lead LFCSP package (vs AD7980BCPZ)
Notas de projeto
The AD7685BCPZ operates from 2.3V to 5.5V. Use a low-noise LDO to supply VDD and a precision reference for REF. Decouple VDD with a 10uF and 0.1uF capacitor close to the pin. The reference input should be bypassed with a 10uF capacitor to ensure stable operation.
For optimal performance, place the AD7685BCPZ close to the signal source and use a solid ground plane. Keep analog and digital grounds separate and connect them at a single point. Route the SPI lines away from analog inputs to minimize crosstalk.
Ensure the input signal is within the specified common-mode range. The pseudo-differential input requires IN- to be connected to a reference voltage, typically GND. Avoid floating the PD pin; tie it to GND if not used. Also, ensure the SPI clock does not exceed the maximum specified frequency.
Informações de conformidade
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.