AD7608BSTZ - 18-Bit 8-Ch Simultaneous Sampling ADC | Analog Devices
MPN： AD7608BSTZ ✓ 啟用中| 數量 | 單價 | 小計 |
|---|---|---|
| 1 | $65.4545 | $65.45 |
| 10 | $47.2727 | $472.73 |
| 100 | $41.8182 | $4,181.82 |
| 500 | $40 | $20,000.00 |
| 1,000 | $38.1818 | $38,181.80 |
AD7608BSTZ 概覽
What is a data acquisition system? A DAS is a complete signal chain that conditions, samples, and converts analog signals into digital data. The AD7608 integrates all essential analog front-end functions — clamping, filtering, track-and-hold, SAR conversion, and digital interface — reducing external circuitry. As part of the simultaneous sampling ADC family, it captures all channels at the same instant, preserving phase relationships that are critical in three-phase power analysis, vibration monitoring, and motor current sensing.
Key features include 18-bit resolution, 200 kSPS per channel, true simultaneous sampling across eight channels, and bipolar input ranges that eliminate external level-shifting. The second-order antialias filter has a 22 kHz 3 dB cutoff and provides 40 dB rejection at 200 kSPS. The programmable pin-driven digital filter trades bandwidth for improved SNR. The integrated 2.5 V reference and buffer maintain gain stability over temperature. Both parallel and SPI/DSP serial interfaces are available, simplifying connection to MCUs, DSPs, and FPGAs.
Architecturally, the charge redistribution SAR approach provides excellent linearity and low power for a multi-channel precision converter. The input clamp protection and antialias filter simplify front-end design in harsh industrial environments. The flexible digital filter allows engineers to optimize noise versus output data rate for each application.
Typical applications include power-line monitoring, protective relays, motor control, multi-phase energy metering, vibration analysis, and test and measurement instrumentation. The simultaneous sampling capability is essential for accurate phase measurement and multi-axis synchronization. The 18-bit resolution enables detection of small signal variations that 16-bit systems miss.
When designing with the AD7608, place decoupling capacitors close to the AVCC and DVCC pins, and route the reference decoupling capacitor adjacent to REFIN/REFOUT. Balance the oversampling ratio against settling time so the increased digital filtering does not reduce the effective throughput below system requirements.
直接替換替代品，適用於 AD7608BSTZ — 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： AD7608BSTZ （相同外形與佔位） — 差異在於 Architecture, Input Clamp Protection, Interface, Internal Reference, Resolution.
快速比較工具 — 選擇替代零件進行並排比較：
AD7606BSTZ
✗ 缺貨
$16.9 / 單位
查看資料表 →AD7609BSTZ
聯絡詢價
查看資料表 →AD7606CSTZ
📋 參考替代品（不在目錄中）
AD7607BSTZ
📋 參考替代品（不在目錄中）
AD7606-6BSTZ
📋 參考替代品（不在目錄中）
AD7606-4BSTZ
📋 參考替代品（不在目錄中）
AD7608BSTZ 最大額定值與電氣特性
| 解析度 | 18 bit |
| Number of Channels | 8 |
| 取樣率 | 200 kSPS per channel |
| Architecture | SAR (charge redistribution successive approximation) |
| Input Voltage Ranges | ±10 V, ±5 V, ±2.5 V |
| 介面 | Parallel; Serial (SPI/DSP) |
| Analog Supply Voltage (AVCC) | 5 V |
| Internal Reference | 2.5 V with buffer (REFIN/REFOUT) |
| Antialias Filter | Second-order, 22 kHz 3 dB cutoff, 40 dB rejection at 200 kSPS |
| Digital Filter | Flexible, pin-driven, programmable oversampling |
| Input Clamp Protection | Yes |
| 封裝 | 64-LQFP (10x10 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度範圍 | -40°C to +85°C |
| 生命週期狀態 | Active (Production) |
AD7608BSTZ 64-lqfp (10x10 mm) 腳位配置指南
AD7608BSTZ（64-lqfp (10x10 mm) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： AD7608BSTZ.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD7608BSTZ 適用於 6 應用s: Power-Line Monitoring, Motor Control, Protective Relays, Multi-Phase Energy Metering, Vibration Analysis, Test and Measurement.
Power-Line Monitoring
The AD7608BSTZ's 18-bit resolution and 200 kSPS simultaneous sampling on eight channels preserve phase relationships between voltage and current. Its ±10 V bipolar input directly connects to CTs and PTs through scaling resistors, while the second-order antialias filter rejects out-of-band noise. In power monitoring, the high dynamic range improves harmonic and disturbance detection.
推薦
Motor Control
In servo and VFD motor drives, the AD7608BSTZ senses currents and bus voltages simultaneously, enabling accurate angle estimation. The 200 kSPS sampling and 18-bit resolution provide sufficient bandwidth for fast current loops, while the ±5 V and ±10 V input ranges match common sensor outputs. Integrated input clamp protection reduces external protection circuitry.
推薦
Protective Relays
Protective relays require precise phase-coherent sampling of six current and two voltage channels. The AD7608BSTZ meets this with eight simultaneous channels, 18-bit resolution, and ±10 V input range, while the pin-driven digital filter rejects transients. Its 200 kSPS throughput supports burst measurements during fault events. Bipolar inputs handle CT saturation inrush without additional conditioning.
推薦
Multi-Phase Energy Metering
For three-phase energy metering, the AD7608BSTZ simultaneously digitizes three voltages and three currents plus neutral, retaining phase integrity. The 18-bit resolution improves active and reactive power accuracy at low current levels, and the internal 2.5 V reference with buffer maintains gain stability over temperature. 200 kSPS allows harmonic analysis beyond the 50/60 Hz fundamentals.
推薦
Vibration Analysis
Vibration monitoring needs synchronized multi-axis sampling; the AD7608BSTZ's simultaneous track-and-hold ensures zero skew between accelerometer channels. The ±2.5 V input range matches MEMS sensor outputs, while 200 kSPS captures high-frequency vibration components. The flexible digital filter can trade bandwidth for noise performance, aiding condition monitoring and bearing fault detection.
推薦
Test and Measurement
General-purpose data acquisition systems use the AD7608BSTZ as a front end for multiple analog channels. The parallel or SPI/DSP interface connects directly to MCUs and FPGAs; 18-bit resolution supports precision instrumentation. The integrated input clamp and antialias filter simplify board design, while 200 kSPS is adequate for transient capture and sensor scanning.
推薦
推薦產品摘要
工程參考資料，適用於 AD7608BSTZ — 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 | AD7606BSTZ | AD7607BSTZ | AD7609BSTZ | AD7606-6BSTZ |
|---|---|---|---|---|---|
| Package | 64-LQFP (10x10) | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18-bit | 16-bit | 14-bit | 18-bit | 16-bit |
| Number of Channels | 8 | 8 | 8 | 8 | 6 |
| Max Sampling Rate | 200 kSPS (all channels) | 200 kSPS (all channels) | 200 kSPS (all channels) | 200 kSPS (all channels) | 200 kSPS (all channels) |
| Input Ranges | ±10 V, ±5 V, ±2.5 V | ±10 V, ±5 V, ±2.5 V | ±10 V, ±5 V, ±2.5 V | ±10 V, ±5 V, ±2.5 V | ±10 V, ±5 V, ±2.5 V |
| Interface | Parallel; Serial (SPI/DSP) | Parallel | Parallel | Parallel | Parallel |
| Internal Reference | 2.5 V with buffer | 2.5 V with buffer | 2.5 V with buffer | 2.5 V with buffer | 2.5 V with buffer |
主要差異化特點
- True 18-bit resolution in an 8-channel simultaneous sampling DAS (對比AD7606BSTZ)
- Four extra bits versus 14-bit family variants (對比AD7607BSTZ)
- Eight simultaneously sampled channels (對比AD7606-6BSTZ)
設計說明
The AD7608BSTZ operates from a single 5 V AVCC supply. Place a 10 uF bulk capacitor and a 100 nF ceramic capacitor close to the AVCC pin, and a similar combination on DVCC if used. The VDRIVE pin sets the digital interface voltage; ensure it does not exceed the host I/O supply and is decoupled with a 100 nF capacitor. Excessive input voltage beyond ±16.5 V can trigger the internal clamp protection, but external series resistance should still be considered for severe overvoltage transients.
For best noise performance, place the 1 uF reference decoupling capacitor as close as possible to REFIN/REFOUT and the REGCAP decoupling capacitors near the corresponding pins. Use a solid analog ground plane beneath the 64-LQFP and avoid routing digital traces under the analog input paths. The AD7608's second-order antialias filter reduces the need for external RC filtering, but keep the analog input traces short and shielded from the parallel data bus to preserve 18-bit SNR.
Do not confuse the flexible digital filter oversampling with the ADC sampling rate. Setting a high oversampling ratio improves noise rejection but reduces the output data rate because each conversion requires multiple samples. For 200 kSPS continuous throughput, use a minimal oversampling setting. Also verify STBY and RANGE pin logic levels during power-up; incorrect settings can place the part in standby or change the analog input scale unexpectedly.
合規資訊
Compliance data was not explicitly provided in the verified web data. The 'Z' suffix in ADI part numbers often indicates RoHS-compliant lead-free finish, but this should be confirmed on the Analog Devices product page before production use.
