The AD7928/AD7918/AD7908 are respectively, 12-bit, 10-bit, and 8-bit high speed, low power, 8-channel, successive- approximation ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1 MSPS. The parts contain a low-noise, wide bandwidth track/hold amplifier, which can handle input frequencies in excess of 8MHz.
The conversion process and data acquisition are controlled using CS and the serial clock signal, allowing the device to easily interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and conversion is also initiated at this point. There are no pipeline delays associated with the part.
The AD7928/AD7918/AD7908 use advanced design techniques to achieve very low power dissipation at maximum throughput rates. At maximum throughput rates, the AD7928/AD7918/AD7908 consume 1.8 mA with 3V supplies and with 5V supplies the current consumption is 2.5 mA.
AD7908/AD7918/AD7928分别是8位、10位和12位高速、低功耗、8通道、逐次逼近型ADC,采用2.7 V至5.25 V单电源供电,最高吞吐量达1 MSPS。这些器件均内置一个低噪声、宽带宽采样保持放大器,可处理8 MHz以上的输入频率。
转换过程和数据采集过程通过CS和串行时钟信号进行控制,从而为器件与微处理器或DSP轻松接口创造了条件。输入信号在CS的下降沿进行采样,而转换同时在此处启动。该器件无流水线延迟。
AD7908/AD7918/AD7928采用先进的设计技术,可在最高吞吐量下实现极低的功耗。在最高吞吐量下,采用3 V电源时,AD7908/AD7918/AD7928的最大功耗为2 mA；采用5 V电源时,最大功耗为2.7 mA。
通过配置控制寄存器,器件的模拟输入范围可以在0 V至REF IN或0 V至2 × REFIN间选择,可采用标准二进制或二进制补码输出编码。AD7908/AD7918/AD7928具有8个带通道序列器的单端模拟输入,可以通过预先编程选择通道转换顺序。
AD7908/AD7918/AD7928的转换时间取决于SCLK频率,该频率同时用作转换控制的主时钟。
| Resolution (Bits) | 10bit | Interface | Ser,SPI |
| T-Put Rate | 1MSPS | Ain Range | Uni (Vref),Uni (Vref) x 2 |
| # Chan | 8 | SNR (dB) | 61dB |
| Supply V | Single(+3),Single(+3.3),Single(+5) | Pkg Type | SOP |
| Pwr Diss (max) | 13.5mW | -- | -- |
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD7918BRUZ | 量产 | 20 ld TSSOP | 20 | 工业 |
| AD7918BRUZ-REEL | 量产 | 20 ld TSSOP | 20 | 工业 |
| AD7918BRUZ-REEL7 | 量产 | 20 ld TSSOP | 20 | 工业 |
