ADI公司的AD7767,AD7767-1和AD7767-2是高性能24位过采样SAR 模数转换器(ADC),具有许多性能组合,包括动态范围大和输入带宽宽,功耗分别为15mW,10.5mW和8.5mW,16引脚TSSOP封装. AD7767,AD7767-1和AD7767-2提供24位的分辨率,极好的SNR,动态范围宽和杰出的DC精度,非常适合低功耗PCI/USB数据采集系统,低功耗无线采集系统,震动分析,仪表以及高精度医疗设备.本文还提供了AD7767,AD7767-1和AD7767-2的应用电路图以及所用的材料清单(BOM).
The AD7767/AD7767-1/AD7767-2 are high performance 24-bit oversampled SAR analog-to-digital converters (ADC). The AD7767/AD7767-1/AD7767-2 combine the benefits of a large dynamic range and input bandwidth, consuming 15 mW, 10.5 mW, and 8.5 mW power, respectively, all contained in a 16-lead TSSOP package. Ideal for ultralow power data acquisition (such as PCI- and USB-based systems), the AD7767/AD7767-1/AD7767-2 provide 24-bit resolution. The combination of exceptional SNR, wide dynamic range, and outstanding dc accuracy make the AD7767/AD7767-1/AD7767-2 ideally suited for measuring small signal changes over a wide dynamic range. This is particularly suitable for applications where small changes on the input are measured on larger ac or dc signals. In such an application, the AD7767/AD7767-1/AD7767-2 accurately gather both ac and dc information.
The AD7767/AD7767-1/AD7767-2 include an on-board digital filter (complete with linear phase response) that acts to elimi-nate out-of-band noise by filtering the oversampled input voltage. The oversampled architecture also reduces front-end antialias requirements. Other features of the AD7767 include a SYNC /PD  (synchronization/power-down) pin, allowing the synchronization of multiple AD7767 devices. The addition of an SDI pin provides the option of daisy chaining multiple AD7767 devices.
The AD7767/AD7767-1/AD7767-2 operate from a 2.5 V supply using a 5 V reference. The devices operate from −40°C to +105°C.

主要特性:

Oversampled successive approximation (SAR) architecture
High performance ac and dc accuracy, low power 115.5 dB dynamic range, 32 kSPS (AD7767-2)
112.5 dB dynamic range, 64 kSPS (AD7767-1) 109.5 dB dynamic range, 128 kSPS (AD7767) −118 dB THD
Exceptionally low power 8.5 mW, 32 kSPS (AD7767-2) 10.5 mW, 64 kSPS (AD7767-1) 15 mW, 128 kSPS (AD7767)
High dc accuracy 24 bits, no missing codes (NMC) INL: ±3 ppm (typical), ±7.6 ppm (maximum)
Low temperature drift Zero error drift: 15 nV/°C Gain error drift: 0.0075% FS
On-chip low-pass FIR filter Linear phase response Pass-band ripple: ±0.005 dB Stop-band attenuation: 100 dB
2.5 V supply with 1.8 V/2.5 V/3 V/3.6 V logic interface options
Flexible interfacing options Synchronization of multiple devices Daisy chain capability
Power-down function
Temperature range: −40°C to +105°C

应用:
Low power PCI/USB data acquisition systems
Low power wireless acquisition systems
Vibration analysis
Instrumentation

High precision medical acquisition



下面是EVAL-AD7766/AD7767评估板的主要电路图:



Fig2. AD7766/AD7767 评估板电路图之一.



Fig3. AD7766/AD7767评估板电路图之二.



Fig4. AD7766/AD7767评估板电路图之三.



Fig5. AD7766/AD7767评估板电路图之四.



Fig6. AD7766/AD7767评估板电路图之五.

AD7766/AD7767评估板材料清单(BOM):











详情请上网:

http://www.analog.com/UploadedFiles/Data_Sheets/AD7767.pdf

来源：中电网