• 8位半快速型（half-flash）ADC，转换时间为420 ns
• 1/4/8单端模拟输入通道，并提供输入偏移调节
• 片内采样保持
• 提供最高10 MHz输入频率时的信噪比性能
• 转换结束时自动关断
• 片内基准电压源（2.5 V）
• 工作电压范围较宽：
  3 V ± 10%和5 V ± 10%
• 输入范围：
  0 V至2 V p-p，VDD = 3 V ± 10%
  0 V至2.5 V p-p，VDD = 5 V ±10%
• 灵活的并行接口，利用EOC脉冲可独立工作

• 8-bit half-flash ADC with 420 ns conversion time
• 1, 4 and 8 Single-Ended Analog Input Channels Available with Input Offset Adjust
• On-Chip Track-and-Hold
• SNR Performance Given for Input Frequencies Up to 10 MHz
• Automatic Power-Down at the End of Conversion
• On-Chip Reference (2.5 V)
• Wide Operating Supply Range
• 3 V ± 10% and 5 V ± 10%
  Input Ranges:
  0 V to 2 V p-p, VDD = 3 V ± 10%
  0 V to 2.5 V p-p, VDD = 5 V ± 10%
• Flexible Parallel Interface with EOC Pulse to Allow Stand-Alone Operation

1. 快速转换时间。AD7822/AD7825/AD7829的转换时间为420 ns，更快的转换时间使实时系统中的DSP处理效率最高。
2. 模拟输入范围调节。用户可利用VMID引脚使输入范围偏移，此特性可降低单电源运算放大器的要求，并考虑系统失调。
3. 全功率带宽（FPBW）采样保持。采样保持放大器具有出色的高频性能。AD7822/AD7825/AD7829能够转换频率最高达10 MHz的满量程输入信号，因此，这些器件非常适合子采样应用。
4. 通道选择。无需对器件执行写入操作便可进行通道选择。

1. Fast Conversion Time. The AD7822/AD7825/AD7829 have a conversion time of 420 ns. Faster conversion times maximize the DSP processing time in a real-time system.
2. Analog Input Span Adjustment. The VMID pin allows the user to offset the input span. This feature can reduce the requirements of single-supply op amps and take into account any system offsets.
3. FPBW (Full Power Bandwidth) of Track-and-Hold. The track-and-hold amplifier has an excellent high frequency performance. The AD7822/AD7825/AD7829 are capable of converting full-scale input signals up to a frequency of 10 MHz. This makes the parts ideally suited to subsampling applications.
4. Channel Selection. Channel selection is made without the necessity of writing to the part.

AD7822 应用领域

• 数据采集系统、DSP前端
• 磁盘驱动器
• 移动通信系统、子采样应用

AD7822 技术指标

• Resolution (Bits): 8bit
• # Chan: 1
• Sample Rate: 2MSPS
• Interface: Par
• Analog Input Type: SE-Uni
• Ain Range: 2 V p-p,2.5V p-p
• ADC Architecture: Pipelined
• Pkg Type: DIP,SOIC,SOP