The AD7858/AD7858L are high speed, low power, 12-bit ADCs that operate from a single 3 V or 5 V power supply, the AD7858 being optimized for speed and the AD7858L for low power. The ADC powers up with a set of default conditions at which time it can be operated as a read only ADC. The ADC contains self-calibration and system calibration options to ensure accurate operation over time and temperature and have a number of power-down options for low power applications. The part powers up with a set of default conditions and can operate as a read only ADC.
The AD7858 is capable of 200 kHz throughput rate while the AD7858L is capable of 100 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo-differential sampling scheme. The AD7858/AD7858L voltage range is 0 to VREF with both straight binary and 2s complement output coding. Input signal range is to the supply and the part is capable of converting full power signals to 100 kHz.
CMOS construction ensures low power dissipation of typically 5.4 mW for normal operation and 3.6 µW in power-down mode. The part is available in 24-pin, 0.3 inch-wide dual-in-line package (DIP), 24-lead small outline (SOIC) and 24-lead small shrink outline (SSOP) packages
AD7858/AD7858L均为高速、低功耗、12位ADC,采用3 V或5 V单电源供电,二者分别针对速度和低功耗进行了优化。当满足一组默认条件时,ADC上电,此时可作为只读ADC使用。两款ADC都含有自校准和系统校准选项,可确保操作精度不受时间和温度影响,还具有适合低功耗应用的多个省电选项。当满足一组默认条件时,这些器件上电,可作为只读ADC使用。
AD7858的吞吐量可达200 kHz,而AD7858L的吞吐量可达100 kHz。通过输入采样保持功能可在500 ns内采集一个信号,并采用伪差分采样方案。AD7858/AD7858L的电压范围为0至VREF,采用标准二进制和二进制补码两种输出编码。输入信号范围可至电源电压,而且两款器件能够转换100 kHz的全功率信号。
CMOS结构可确保获得低功耗,正常工作模式下的典型功耗为5.4 mW,省电模式下为3.6 µW。两款器件提供三种封装：24引脚、0.3英寸宽、双列直插式封装（DIP）；24引脚小形集成封装（SOIC）；以及24引脚紧缩小型封装（SSOP）。
| Resolution (Bits) | 12bit | Interface | Ser,SPI |
| T-Put Rate | n/a | Ain Range | (Vref) p-p,Uni (Vref) |
| # Chan | 1 | SNR (dB) | 71dB |
| Supply V | Single(+3.3),Single(+5) | Pkg Type | - |
| Pwr Diss (max) | 33mW | -- | -- |
| 产品型号 | 产品状态 | 封装 | Pins | 温度范围 |
|---|---|---|---|---|
| AD7858AN | 量产 | 24 ld PDIP | 24 | 商业 |
| AD7858ANZ | 量产 | 24 ld PDIP | 24 | 商业 |
| AD7858AR | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
| AD7858AR-REEL | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
| AD7858ARZ | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
| AD7858ARZ-REEL | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
| AD7858BNZ | 量产 | 24 ld PDIP | 24 | 商业 |
| AD7858BR | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
| AD7858BR-REEL | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
| AD7858BRZ | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
| AD7858BRZ-REEL | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
| AD7858LANZ | 量产 | 24 ld PDIP | 24 | 商业 |
| AD7858LARS | 量产 | 24 ld SSOP | 24 | 商业 |
| AD7858LARS-REEL | 量产 | 24 ld SSOP | 24 | 商业 |
| AD7858LARSZ | 量产 | 24 ld SSOP | 24 | 商业 |
| AD7858LARSZ-REEL | 量产 | 24 ld SSOP | 24 | 商业 |
| AD7858LARZ | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
| AD7858LARZ-REEL | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
| AD7858LBNZ | 量产 | 24 ld PDIP | 24 | 商业 |
| AD7858LBR-REEL | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
| AD7858LBRZ | 量产 | 24 ld SOIC - Wide | 24 | 商业 |
