AD7799BRUZ - 24-Bit Sigma-Delta ADC with In-Amp | Analog Devices
部品番号: AD7799BRUZ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.58 | $75.80 |
| 100 | $6.74 | $674.00 |
| 500 | $6.07 | $3,035.00 |
| 1,000 | $5.41 | $5,410.00 |
AD7799BRUZ 概要
A Sigma-Delta ADC is an analog-to-digital converter that uses oversampling and noise shaping to achieve high resolution, typically 16 to 24 bits, by trading speed for accuracy. It is the preferred choice for low-frequency, high-precision applications such as weigh scales, temperature sensors, and pressure transducers, where the signal bandwidth is narrow but the required resolution is high. The AD7799 belongs to the family of precision Sigma-Delta ADCs, which are essential building blocks in data acquisition systems, bridging the analog sensor world to the digital processing domain.
Key features of the AD7799BRUZ include a low noise performance of 40 nV/√Hz, an on-chip low-side power switch, reference detect, programmable digital output pins, burnout currents, and an internal clock oscillator. The device also offers a programmable gain amplifier (PGA) with gains of 1, 2, 4, 8, 16, 32, 64, and 128, allowing direct connection to low-level sensor outputs. The output data rate is software-programmable, and the device supports both external and internal references, providing flexibility in system design.
Technically, the AD7799 uses a third-order Sigma-Delta modulator followed by a digital filter, achieving excellent noise performance and linearity. The on-chip in-amp allows direct interface to bridge sensors and thermocouples without external signal conditioning. The device includes a SPI-compatible serial interface for configuration and data readout, and it operates over the industrial temperature range of -40°C to +105°C. The TSSOP-16 package is ideal for space-constrained designs, and the device is RoHS compliant.
Typical applications include weigh scales, strain gauge transducers, temperature measurement with RTDs and thermocouples, pressure sensors, and general precision data acquisition. The low power consumption of 500 µA makes it suitable for battery-powered and portable instruments. The AD7799BRUZ is a production part from Analog Devices, with a 1ku list price starting from $6.41 as of 2026-08-22.
When designing with the AD7799BRUZ, ensure proper decoupling of the AVDD and DVDD supplies with 0.1 µF and 10 µF capacitors, and place the reference decoupling capacitor close to the REFIN pins. The on-chip PGA allows direct sensor connection, but care must be taken to avoid exceeding the common-mode input range. The SPI interface should be isolated from noisy digital lines to maintain the high resolution performance.
ドロップイン代替品: AD7799BRUZ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: AD7799BRUZ （同一形状・フットプリント） — 相違点: Package, Supply Voltage, Output Data Rate, Resolution, RoHS Status.
クイック比較ツール — 並列比較する代替部品を選択:
AD7798BRUZ
✅ ドロップイン✓ 在庫あり
$3.85 / 個
データシートを見る →AD7799BRUZ-REEL
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD7798BRUZ-REEL
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD7799BRUZ
✅ ドロップイン✓ 在庫あり
$5.41 / 個
データシートを見る →AD7798BRUZ
✅ ドロップイン✓ 在庫あり
$3.85 / 個
データシートを見る →AD7799BRUZ-REEL
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD7799BRUZ 最大定格＆電気的特性
| 分解能 | 24 Bit |
| Number of Inputs | 3 Differential |
| Input Type | Differential |
| Data Interface | SPI |
| サンプリングレート | 4.17 Hz to 470 Hz |
| Voltage Supply | 2.7 V to 5.25 V |
| 動作温度 | -40°C to +105°C |
| パッケージ | 16-TSSOP |
| 実装タイプ | Surface Mount |
| Number of Bits | 24 |
| Number of A/D Converters | 1 |
| Architecture | Sigma-Delta |
| Reference Type | External, Internal |
| Voltage - Supply, Analog | 2.7 V ~ 5.25 V |
| Voltage - Supply, Digital | 2.7 V ~ 5.25 V |
| 特長 | PGA, Temperature Sensor |
| RoHS ステータス | Compliant |
AD7799BRUZ ピン構成
| ピン 1 | SCLK — Serial Clock Input |
| ピン 2 | DIN — Serial Data Input |
| ピン 3 | DOUT/RDY — Serial Data Output / Ready |
| ピン 4 | CS — Chip Select |
| ピン 5 | SYNC — Synchronization Input |
| ピン 6 | GND — Ground |
| ピン 7 | AVDD — Analog Power Supply |
| ピン 8 | DVDD — Digital Power Supply |
| ピン 9 | REFIN(+) — Positive Reference Input |
| ピン 10 | REFIN(-) — Negative Reference Input |
| ピン 11 | AIN1(+) — Positive Analog Input 1 |
| ピン 12 | AIN1(-) — Negative Analog Input 1 |
| ピン 13 | AIN2(+) — Positive Analog Input 2 |
| ピン 14 | AIN2(-) — Negative Analog Input 2 |
| ピン 15 | AIN3(+) — Positive Analog Input 3 |
| ピン 16 | AIN3(-) — Negative Analog Input 3 |
主な用途
AD7799BRUZ の用途: 6 件s: Weigh Scales, Temperature Measurement, Pressure Sensors, Strain Gauge Transducers, Industrial Process Control, Portable Instruments.
Weigh Scales
The AD7799BRUZ is ideal for weigh scale applications due to its 24-bit resolution and low noise of 40 nV/√Hz. The on-chip PGA with gains up to 128 allows direct connection to load cells, which typically output only a few millivolts. The low power consumption of 500 µA makes it suitable for battery-powered scales. The programmable output data rate from 4.17 Hz to 470 Hz allows trade-off between speed and noise, enabling stable readings in static weighing applications.
おすすめ
Temperature Measurement
The AD7799BRUZ is well-suited for temperature measurement with RTDs and thermocouples. Its 24-bit resolution and low noise enable accurate temperature readings over a wide range. The on-chip in-amp and PGA allow direct connection to thermocouples, which produce small voltages. The device supports external references, enabling ratiometric measurements with RTDs. The SPI interface simplifies integration with microcontrollers for data logging and control.
おすすめ
Pressure Sensors
The AD7799BRUZ is ideal for pressure sensor applications, providing high-resolution conversion of bridge sensor outputs. The on-chip PGA with gains up to 128 amplifies the small differential signals from pressure transducers. The low noise performance ensures accurate pressure readings. The device's low power consumption is beneficial for portable pressure monitors. The programmable output data rate allows optimization for dynamic pressure measurements.
おすすめ
Strain Gauge Transducers
The AD7799BRUZ is designed for strain gauge applications, offering 24-bit resolution and low noise to capture small changes in resistance. The on-chip in-amp and PGA provide the necessary gain to interface directly with strain gauge bridges. The device includes burnout currents to detect sensor faults. Its low power consumption makes it suitable for portable and remote sensing applications. The SPI interface allows easy configuration and data retrieval.
おすすめ
Industrial Process Control
The AD7799BRUZ is suitable for industrial process control, providing high-precision analog-to-digital conversion for various sensors. Its 24-bit resolution and low noise ensure accurate monitoring of process variables. The device operates over the industrial temperature range of -40°C to +105°C, making it robust for harsh environments. The on-chip PGA and reference detect features enhance system reliability. The SPI interface facilitates integration with PLCs and microcontrollers.
おすすめ
Portable Instruments
The AD7799BRUZ is ideal for portable instruments due to its low power consumption of 500 µA. The 24-bit resolution and low noise enable high-precision measurements in battery-powered devices. The compact 16-TSSOP package saves board space. The device supports a wide supply voltage range of 2.7V to 5.25V, allowing operation from a single lithium-ion cell. The SPI interface simplifies connection to low-power microcontrollers.
おすすめ
エンジニアリング参考データ: AD7799BRUZ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | AD7798BRUZ | AD7799BRUZ-REEL | AD7798BRUZ-REEL |
|---|---|---|---|---|
| Package | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 24 Bit | 16 Bit | 24 Bit | 16 Bit |
| Number of Inputs | 3 Differential | 3 Differential | 3 Differential | 3 Differential |
| Data Interface | SPI | SPI | SPI | SPI |
| Sampling Rate | 4.17 Hz to 470 Hz | 4.17 Hz to 470 Hz | 4.17 Hz to 470 Hz | 4.17 Hz to 470 Hz |
| Voltage Supply | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Operating Temperature | -40°C to +105°C | -40°C to +105°C | -40°C to +105°C | -40°C to +105°C |
主な差別化要因
- 24-bit resolution with on-chip in-amp （vs AD7798BRUZ)
- Low noise of 40 nV/√Hz （vs AD7798BRUZ)
- Programmable gain up to 128 （vs AD7798BRUZ)
設計ノート
Decouple the AVDD and DVDD pins with 0.1 µF and 10 µF capacitors placed as close to the pins as possible. Use separate analog and digital ground planes to minimize noise coupling. The AD7799BRUZ operates from 2.7V to 5.25V, so ensure the supply is clean and stable for optimal performance.
Place the reference decoupling capacitor close to the REFIN(+) and REFIN(-) pins. Use a low-ESR capacitor, such as a 10 µF X7R ceramic, to maintain reference stability. Keep the analog input traces short and shielded to reduce noise pickup. The TSSOP-16 package has a 0.65mm pitch, so use fine-pitch soldering techniques.
Avoid exceeding the common-mode input range of the PGA. The input voltage should stay within the supply rails. Ensure the SPI lines are not routed near high-speed digital signals to prevent crosstalk. The AD7799BRUZ has an internal clock, but if using an external clock, ensure it is clean and within the specified frequency range.
コンプライアンス情報
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
