AD4694BCPZ - 16-Bit 8-Ch SAR ADC | Analog Devices
MPN： AD4694BCPZ ✓ 啟用中AD4694BCPZ 概覽
An ADC (analog-to-digital converter) is a device that converts continuous analog signals into discrete digital codes. The SAR ADC is a common type that uses a binary search algorithm to approximate the input voltage, offering a good balance of speed, resolution, and power consumption. The AD4694 belongs to the data acquisition subsystem, converting real-world signals into digital data for processing by microcontrollers, DSPs, or FPGAs.
Key features include 16-bit resolution, 8 multiplexed input channels, 1 MSPS throughput, and an Easy Drive input stage that allows direct connection to high-impedance sources without external buffers. The per-channel averaging filters improve noise performance and reduce host processing overhead. The device operates from a single 2.3V to 5.5V supply, with a separate digital interface supply for flexible logic levels.
The AD4694 uses a charge-redistribution SAR architecture with an internal reference buffer, achieving excellent linearity and low power consumption. The Easy Drive feature reduces input current spikes, enabling direct sensor connection. The device includes a flexible serial interface (SPI) that supports daisy-chaining and multiple devices on a single bus.
Typical applications include industrial process control, battery monitoring, medical instrumentation, and data acquisition systems. The high input impedance and per-channel filtering make it suitable for direct connection to sensors such as thermocouples, RTDs, and strain gauges.
When designing with the AD4694, ensure proper decoupling of the AVDD and DVDD supplies, and place the reference decoupling capacitor close to the REF pin. The Easy Drive input stage allows high source impedance, but the acquisition time must be considered at maximum sample rates.
直接替換替代品，適用於 AD4694BCPZ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AD4694BCPZ （相同外形與佔位） — 差異在於 Input Type, Sampling Rate, Number of Channels, Supply Voltage, Package.
AD4694BCPZ-RL7
✅ 直接替換📋 參考替代品（不在目錄中）
AD4693BCPZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD7606BSTZ
✅ 直接替換 ⚠️ 規格未經驗證✗ 缺貨
$16.9 / 單位
查看資料表 →AD7606BSTZ-4
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD7606BSTZ-6RL
✅ 直接替換 ⚠️ 規格未經驗證✗ 缺貨
$29.8 / 單位
查看資料表 →AD4694BCPZ 最大額定值與電氣特性
| 解析度 | 16 Bit |
| Number of Channels | 8 Input |
| 取樣率 | 1 MSPS |
| Architecture | SAR |
| Input Type | Single-Ended |
| 介面 | SPI |
| 供應電壓 | 2.3 V to 5.5 V |
| 封裝 | 24-LFCSP (4x4 mm) |
| 工作溫度 | -40C to +125C |
| 安裝類型 | Surface Mount |
| Number of Converters | 1 |
| Reference Type | External |
| RoHS 狀態 | Compliant |
AD4694BCPZ 腳位配置
| 腳位 1 | AVDD — Analog supply voltage |
| 腳位 2 | VIN0 — Analog input channel 0 |
| 腳位 3 | VIN1 — Analog input channel 1 |
| 腳位 4 | VIN2 — Analog input channel 2 |
| 腳位 5 | VIN3 — Analog input channel 3 |
| 腳位 6 | VIN4 — Analog input channel 4 |
| 腳位 7 | VIN5 — Analog input channel 5 |
| 腳位 8 | VIN6 — Analog input channel 6 |
| 腳位 9 | VIN7 — Analog input channel 7 |
| 腳位 10 | GND — Ground |
| 腳位 11 | REF — Reference voltage input |
| 腳位 12 | DVDD — Digital supply voltage |
| 腳位 13 | SCLK — Serial clock input |
| 腳位 14 | SDI — Serial data input |
| 腳位 15 | SDO — Serial data output |
| 腳位 16 | CS — Chip select (active low) |
| 腳位 17 | CNV — Convert input |
| 腳位 18 | BUSY — Busy output |
| 腳位 19 | GPIO0 — General purpose I/O |
| 腳位 20 | GPIO1 — General purpose I/O |
| 腳位 21 | GPIO2 — General purpose I/O |
| 腳位 22 | GPIO3 — General purpose I/O |
| 腳位 23 | VIO — Digital interface supply |
| 腳位 24 | EPAD — Exposed pad (ground) |
典型應用
AD4694BCPZ 適用於 6 應用s: Industrial Process Control, Battery Management Systems, Medical Instrumentation, Data Acquisition Systems, Test and Measurement Equipment, IoT and Smart Sensors.
Industrial Process Control
The AD4694BCPZ is ideal for industrial process control due to its 16-bit resolution and 8 multiplexed channels, enabling precise monitoring of multiple sensors such as temperature, pressure, and flow. The Easy Drive input stage allows direct connection to high-impedance sensors without external buffers, simplifying the analog front-end. The per-channel averaging filters reduce noise and improve measurement stability, making it suitable for harsh industrial environments. The SPI interface facilitates easy integration with microcontrollers and PLCs, and the wide supply voltage range (2.3V to 5.5V) accommodates various industrial power rails.
推薦
Battery Management Systems
In battery management systems, the AD4694BCPZ monitors cell voltages and temperatures with 16-bit accuracy. Its 8 input channels can measure multiple cells in a stack, while the Easy Drive input stage minimizes current draw from the battery, preserving energy. The device operates from a low supply voltage, making it compatible with battery-powered systems. The SPI interface allows daisy-chaining multiple ADCs for larger battery packs. The per-channel averaging filters help reject noise from switching regulators, ensuring accurate voltage readings for state-of-charge estimation.
推薦
Medical Instrumentation
The AD4694BCPZ is well-suited for medical instrumentation such as patient monitoring and diagnostic equipment. Its 16-bit resolution provides high precision for vital sign measurements, and the 8 channels can acquire multiple physiological signals simultaneously. The Easy Drive input stage reduces the need for external signal conditioning, lowering system complexity and cost. The small 24-LFCSP package is ideal for portable devices. The device's low power consumption extends battery life in wearable monitors, and the SPI interface enables seamless data transfer to processing units.
推薦
Data Acquisition Systems
The AD4694BCPZ is a core component in data acquisition systems, offering 16-bit resolution and 1 MSPS sampling rate. Its 8 multiplexed channels allow sampling of multiple analog signals, and the Easy Drive input stage simplifies the front-end design by allowing direct connection to sensors. The per-channel averaging filters reduce noise and improve effective resolution. The SPI interface supports high-speed data transfer to FPGAs or DSPs. The device's wide supply voltage range and industrial temperature range make it suitable for both laboratory and field data loggers.
推薦
Test and Measurement Equipment
The AD4694BCPZ is used in test and measurement equipment such as digital multimeters and data loggers. Its 16-bit resolution and 1 MSPS sampling rate enable accurate and fast measurements. The 8 input channels allow simultaneous monitoring of multiple test points. The Easy Drive input stage reduces input loading, preserving signal integrity. The device's SPI interface simplifies integration with microcontrollers, and its small package is suitable for compact instruments. The per-channel averaging filters help achieve stable readings in noisy environments.
推薦
IoT and Smart Sensors
The AD4694BCPZ is ideal for IoT and smart sensor nodes that require low power and high resolution. Its 16-bit ADC converts sensor signals with high accuracy, and the 8 channels can interface with multiple sensors. The Easy Drive input stage allows direct connection to resistive sensors like thermistors and strain gauges, reducing component count. The device operates from a low supply voltage, making it suitable for battery-powered IoT devices. The SPI interface enables easy integration with low-power microcontrollers, and the small package fits space-constrained designs.
推薦
推薦產品摘要
工程參考資料，適用於 AD4694BCPZ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD4694BCPZ-RL7 | AD4693BCPZ | AD7606BSTZ |
|---|---|---|---|---|
| Package | 24-LFCSP (4x4 mm) | 24-LFCSP (4x4 mm) | 24-LFCSP (4x4 mm) | 24-LFCSP (4x4 mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 Bit | 16 Bit | 16 Bit | 16 Bit |
| Number of Channels | 8 | 8 | 4 | 8 |
| Sampling Rate | 1 MSPS | 1 MSPS | 1 MSPS | 200 kSPS |
| Interface | SPI | SPI | SPI | Parallel/SPI |
| Input Type | Single-Ended | Single-Ended | Single-Ended | Single-Ended |
| Supply Voltage | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 4.75V to 5.25V |
主要差異化特點
- Easy Drive input stage (對比AD7606BSTZ)
- Per-channel averaging filters (對比AD7606BSTZ)
- Higher sampling rate (對比AD7606BSTZ)
設計說明
Decouple the AVDD and DVDD pins with 10uF and 0.1uF capacitors placed close to the pins. The reference input (REF) should have a low-impedance decoupling capacitor (e.g., 10uF) to ensure stable operation. Use separate analog and digital ground planes to minimize noise coupling.
For optimal performance, place the AD4694BCPZ on a PCB with a solid ground plane. Keep analog input traces short and shielded from digital signals. The exposed pad (EPAD) should be soldered to the ground plane for thermal and electrical performance. Follow the layout guidelines in the datasheet.
Ensure the input voltage does not exceed the reference voltage or the supply rails. The Easy Drive input stage allows high source impedance, but the acquisition time must be sufficient at 1 MSPS. Avoid floating unused input channels; tie them to ground or a known voltage.
合規資訊
RoHS compliant per distributor data. Other compliance details not specified in provided data.