The AD7854/AD7854L is a high speed, low power, 12-bit ADC that operates from a single 3 V or 5 V power supply, the AD7854 being optimized for speed and the AD7854L 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 has a number of power-down options for low power applications.
The AD7854 is capable of 200 kHz throughput rate while the AD7854L 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 AD7854 and AD7854L input voltage range is 0 to VREF (unipolar) and -VREF/2 to +VREF/2, centered at VREF/2 (bipolar). The coding is straight binary in unipolar mode and twos complement in bipolar mode. 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 28-pin, 0.6 inch wide dual-in-line package (DIP), 28-lead small outline (SOIC) and 28-lead small shrink outline (SSOP) packages.
AD7854/AD7854L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。
AD7854的吞吐量可达200 kHz,而AD7854L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。AD7854和AD7854L的输入电压范围为0至VREF（单极性）和以VREF/2为中心的-VREF/2至+VREF/2（双极性）。在单极性方式下,采用标准二进制编码；在双极性方式下,采用二进制补码编码。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：28引脚、0.6英寸宽、双列直插式封装（DIP）；28引脚小形集成封装（SOIC）；以及28引脚紧缩小型封装（SSOP）。
| Resolution (Bits) | 12bit | Interface | Byte,Par |
| 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 | SOIC,SOP |
| Pwr Diss (max) | 30mW | -- | -- |
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD7854AQ | 量产 | CERDIP GLASS SEAL | 28 | 工业 |
| AD7854AR | 量产 | 28 ld SOIC - Wide | 28 | 工业 |
| AD7854ARS | 量产 | 28 ld SSOP | 28 | 工业 |
| AD7854ARS-REEL | 量产 | 28 ld SSOP | 28 | 工业 |
| AD7854ARSZ | 量产 | 28 ld SSOP | 28 | 工业 |
| AD7854ARZ | 量产 | 28 ld SOIC - Wide | 28 | 工业 |
| AD7854ARZ-REEL | 量产 | 28 ld SOIC - Wide | 28 | 工业 |
| AD7854BRZ | 量产 | 28 ld SOIC - Wide | 28 | 工业 |
| AD7854LAQ | 量产 | CERDIP GLASS SEAL | 28 | 工业 |
| AD7854LARS | 量产 | 28 ld SSOP | 28 | 工业 |
| AD7854LARSZ | 量产 | 28 ld SSOP | 28 | 工业 |
| AD7854LARSZ-REEL | 量产 | 28 ld SSOP | 28 | 工业 |
| AD7854LARZ | 量产 | 28 ld SOIC - Wide | 28 | 工业 |
| AD7854LARZ-REEL | 量产 | 28 ld SOIC - Wide | 28 | 工业 |
| AD7854SQ | 量产 | CERDIP GLASS SEAL | 28 | 军用 |
