GENERAL DESCRIPTION

The AD7821 is a high speed, 8-bit, sampling, analog-to-digital converter that offers improved performance over the popular AD7820. It offers a conversion time of 660 ns (versus 1.36 μs for the AD7820) and 100 kHz signal bandwidth (versus 6.4 kHz). The sampling instant is better defined and occurs on the falling edge of WR or RD. The provision of a VSS pin (Pin 19) allows the part to operate from ±5 V supplies and to digitize bipolar input signals. Alternatively, for unipolar inputs, the VSS pin can be grounded and the AD7821 will operate from a single +5 V supply, like the AD7820.

FEATURES

Fast Conversion Time: 660 ns Max

100 kHz Track-and-Hold Function

1 MHz Sample Rate

Unipolar and Bipolar Input Ranges

Ratiometric Reference Inputs

No External Clock

Extended Temperature Range Operation

Skinny 20-Lead DlPs, SOIC, and 20-Terminal Surface-Mount Packages

AD7821KN屬于集成電路（IC） > 模數(shù)轉換器（ADC）。亞德諾半導體技術有限公司制造生產(chǎn)的AD7821KN模數(shù)轉換器（ADC）模數(shù)轉換器（ADC、A/D 或 A 轉 D）對模擬信號進行采樣，例如由麥克風采集的聲音或傳感器的輸出，然后將其轉換為數(shù)字信號。一般來說，數(shù)字輸出是二進制補碼二進制數(shù)，與輸入成比例。輸入類型可能是差分、偽差分或單端輸入。模數(shù)轉換器可按照位數(shù)、采樣率、輸入數(shù)、接口、轉換器數(shù)和架構（例如自適應增量、雙斜率、折疊、流水線、SAR、三角積分、兩步式）進行選擇。