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AD7874BQ

更新时间： 2024-01-30 15:37:11
品牌 Logo 应用领域
亚德诺 - ADI 转换器信息通信管理
页数 文件大小 规格书
16页 417K
描述
LC2MOS 4-Channel, 12-Bit Simultaneous Sampling Data Acquisition System

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AD7874BQ 技术参数

Source Url Status Check Date：2013-05-01 14:56:21.354是否无铅：含铅
是否Rohs认证：不符合生命周期：Active
零件包装代码：DIP包装说明：DIP, DIP28,.6
针数：28Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：1.54Is Samacsys：N
最大模拟输入电压：15 V最小模拟输入电压：10 V
最长转换时间：35 µs转换器类型：ADC, SUCCESSIVE APPROXIMATION
JESD-30 代码：R-GDIP-T28JESD-609代码：e0
长度：37.84 mm最大线性误差 (EL)：0.024%
标称负供电电压：-5 V模拟输入通道数量：4
位数：12功能数量：1
端子数量：28最高工作温度：125 °C
最低工作温度：-55 °C输出位码：2'S COMPLEMENT BINARY
封装主体材料：CERAMIC, GLASS-SEALED封装代码：DIP
封装等效代码：DIP28,.6封装形状：RECTANGULAR
封装形式：IN-LINE峰值回流温度（摄氏度）：NOT APPLICABLE
电源：+-5 V认证状态：Not Qualified
采样速率：0.029 MHz采样并保持/跟踪并保持：TRACK
筛选级别：MIL-STD-883 Class B座面最大高度：5.59 mm
子类别：Analog to Digital Converters最大压摆率：18 mA
标称供电电压：5 V表面贴装：NO
技术：CMOS温度等级：MILITARY
端子面层：Tin/Lead (Sn63Pb37)端子形式：THROUGH-HOLE
端子节距：2.54 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT APPLICABLE宽度：13.2 mm
Base Number Matches：1

AD7874BQ 数据手册

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AD7874  
T he first read operation to the AD7874 after conversion always  
accesses data from Data Register 1 (i.e., the conversion result  
from the VIN1 input). INT is reset high on the falling edge of  
RD during this first read operation. T he second read always ac-  
cesses data from Data Register 2 and so on. T he address pointer  
is reset to point to Data Register 1 on the rising edge of  
CONVST. A read operation to the AD7874 should not be at-  
tempted during conversion. T he timing diagram for the  
AD7874 conversion sequence is shown in Figure 7.  
TRACK/HOLDS GO  
INTO HOLD  
t1  
tCONV  
CONVST  
INT  
tACQUISITION  
t5  
t8  
CS  
RD  
t2  
t4  
t7  
t3  
t6  
CH1  
DATA  
CH4  
DATA  
CH2  
DATA  
CH3 HIGH-  
HIGH-  
Z
HIGH-  
Z
HIGH-Z  
HIGH-IMPEDANCE  
DATA  
DATA  
Z
TIMES t2, t3, t4, t6, t7, AND t8 ARE THE SAME FOR ALL FOUR READ OPERATIONS.  
Figure 7. AD7874 Tim ing Diagram  
Figure 8. AD7874 FFT Plot  
Effective Num ber of Bits  
T he formula given in Equation 1 relates the SNR to the number  
of bits. Rewriting the formula, as in Equation 2, it is possible to  
get a measure of performance expressed in effective number of  
bits (N).  
AD 7874 D YNAMIC SP ECIFICATIO NS  
T he AD7874 is specified and 100% tested for dynamic perfor-  
mance specifications as well as traditional dc specifications such  
as Integral and Differential Nonlinearity. T hese ac specifications  
are required for the signal processing applications such as  
phased array sonar, adaptive filters and spectrum analysis.  
T hese applications require information on the ADC’s effect on  
the spectral content of the input signal. Hence, the parameters  
for which the AD7874 is specified include SNR, harmonic dis-  
tortion, intermodulation distortion and peak harmonics. T hese  
terms are discussed in more detail in the following sections.  
SNR −1. 76  
N =  
(2)  
6.02  
T he effective number of bits for a device can be calculated di-  
rectly from its measured SNR.  
Figure 9 shows a typical plot of effective number of bits versus  
frequency for an AD7874BN with a sampling frequency of  
29 kHz. T he effective number of bits typically falls between  
11.75 and 11.87 corresponding to SNR figures of 72.5 dB and  
73.2 dB.  
Signal-to-Noise Ratio (SNR)  
SNR is the measured signal to noise ratio at the output of the  
ADC. T he signal is the rms magnitude of the fundamental.  
Noise is the rms sum of all the nonfundamental signals up to  
half the sampling frequency (fs/2) excluding dc. SNR is depen-  
dent upon the number of quantization levels used in the digiti-  
zation process; the more levels, the smaller the quantization  
noise. T he theoretical signal to noise ratio for a sine wave input  
is given by  
SNR = (6.02N + 1.76) dB  
where N is the number of bits.  
(1)  
T hus for an ideal 12-bit converter, SNR = 74 dB.  
T he output spectrum from the ADC is evaluated by applying a  
sine wave signal of very low distortion to the VIN input which is  
sampled at a 29 kHz sampling rate. A Fast Fourier T ransform  
(FFT ) plot is generated from which the SNR data can be ob-  
tained. Figure 8 shows a typical 2048 point FFT plot of the  
AD7874BN with an input signal of 10 kHz and a sampling  
frequency of 29 kHz. T he SNR obtained from this graph is  
73.2 dB. It should be noted that the harmonics are taken into  
account when calculating the SNR.  
z
Figure 9. Effective Num bers of Bits vs. Frequency  
–8–  
REV. C  
1...567891011...16

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AD7874BQ 替代型号

型号 品牌 替代类型 描述 数据表
AD7874BQ ADI

当前型号

 LC2MOS 4-Channel, 12-Bit Simultaneous Sampling Data Acquisition System
AD7874BN ADI

功能相似

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