AD7822BRZ

AD7822 is a single channel, microprocessor-compatible, 8-bit analogue-to-digital converter. This device combine the convert start and power-down functions at one pin, that is, the CONVST pin. This allows a unique automatic power-down at the end of a conversion to be implemented. The logic level on the CONVST pin is sampled after the end of a conversion when an EOC (end of conversion) signal goes high. If it is logic low at that point, the ADC is powered down. The parallel interface is designed to allow easy interfacing to microprocessors and DSPs. Using only address decoding logic, the parts are easily mapped into the microprocessor address space. The EOC pulse allows the ADCs to be used in a standalone manner. It is widely used in application such as data acquisition systems, DSP front ends, disk drives, mobile communication systems, subsampling applications etc.

• Conversion time is 420ns
• On-chip track-and-hold
• Signal to (noise + distortion) ratio is 48dB min
• Automatic power-down at the end of conversion
• Wide operating supply is 3V ±10% and 5V ±10%
• Input range is (0V to 2V p-p, VDD = 3V ±10%), (0V to 2.5V p-p, VDD = 5V ±10%)
• Flexible parallel interface with EOC pulse to allow standalone operation
• Total harmonic distortion is −55dB max
• Operating temperature is −40°C to +85°C
• Package style is 20-lead SOIC-W

บันทึก

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