Datasheet > AD781*

AD781*

更新时间： 2024-02-07 09:52:28

品牌	Logo	应用领域
其他 - ETC		放大器
页数	文件大小	规格书
8页	156K
描述
Complete 700 ns Sample-and-Hold Amplifier

阅读下载

获取价格

技术参数
数据手册

如果您发现信息不准确，欢迎纠错

AD781* 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	DIP	包装说明：	CERAMIC, DIP-8
针数：	8	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.33.00.01
风险等级：	5.18	最长采集时间：	0.7 µs
标称采集时间：	0.6 µs	放大器类型：	SAMPLE AND HOLD CIRCUIT
最大模拟输入电压：	5 V	最小模拟输入电压：	-5 V
最大下降率：	1 V/s	JESD-30 代码：	R-GDIP-T8
JESD-609代码：	e0	负供电电压上限：	-15 V
标称负供电电压 (Vsup)：	-12 V	功能数量：	1
端子数量：	8	最高工作温度：	125 °C
最低工作温度：	-55 °C	封装主体材料：	CERAMIC, GLASS-SEALED
封装代码：	DIP	封装等效代码：	DIP8,.3
封装形状：	RECTANGULAR	封装形式：	IN-LINE
峰值回流温度（摄氏度）：	NOT SPECIFIED	电源：	+-12 V
认证状态：	Not Qualified	采样并保持/跟踪并保持：	SAMPLE
座面最大高度：	5.08 mm	子类别：	Sample and Hold Circuit
最大压摆率：	7 mA	供电电压上限：	15 V
标称供电电压 (Vsup)：	12 V	表面贴装：	NO
技术：	BICMOS	温度等级：	MILITARY
端子面层：	Tin/Lead (Sn/Pb)	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 SPECIFIED	宽度：	7.62 mm
Base Number Matches：	1

AD781* 数据手册

AD781

common pin should also be connected to the digital ground,

which is usually tied to analog common at the A-to-D converter.

Figure 4 illustrates the recommended decoupling and grounding

practice.

Measurements of Figures 7 and 8 were made using a 14-bit A/D

converter with V_IN= 10 V p-p and a sample frequency of

100 kSPS.

NO ISE CH ARACTERISTICS

1/2 BIT @

8 BITS

Designers of data conversion circuits must also consider the

effect of noise sources on the accuracy of the data acquisition

system. A sample-and-hold amplifier that precedes the A-to-D

converter introduces some noise and represents another source

of uncertainty in the conversion process. T he noise from the

AD781 is specified as the total output noise, which includes

both the sampled wideband noise of the SHA in addition to the

band limited output noise. T he total output noise is the rms

sum of the sampled dc uncertainty and the hold mode noise. A

plot of the total output noise vs. the equivalent input bandwidth

of the converter being used is given in Figure 5.

0.1%

1/2 BIT @

10 BITS

1/2 BIT @

12 BITS

0.01%

1/2 BIT @

14 BITS

APERTURE JITTER TYPICAL AT 50ps

10k

100k

300

200

100

FREQUENCY – Hz

Figure 6. Error Magnitude vs. Frequency

–65

–70

–75

–80

–85

–90

10k

100k

10M

FREQUENCY – Hz

Figure 5. RMS Noise vs. Input Bandwidth of ADC

–95

100

100k

10k

D RIVING TH E ANALO G INP UTS

FREQUENCY – Hz

For best performance, it is important to drive the AD781 analog

input from a low impedance signal source. T his enhances the

sampling accuracy by minimizing the analog and digital

crosstalk. Signals which come from higher impedance sources

(e.g., over 5 kΩ) will have a relatively higher level of crosstalk.

For applications where signals have high source impedance, an

operational amplifier buffer in front of the AD781 is required.

T he AD711 (precision BiFET op amp) is recommended for

these applications.

Figure 7. Total Harm onic Distortion vs. Frequency

H IGH FREQ UENCY SAMP LING

Aperture jitter and distortion are the primary factors which limit

frequency domain performance of a sample-and-hold amplifier.

Aperture jitter modulates the phase of the hold command and

produces an effective noise on the sampled analog input. T he

magnitude of the jitter induced noise is directly related to the

frequency of the input signal.

100

10k

100k

A graph showing the magnitude of the jitter induced error vs.

frequency of the input signal is given in Figure 6.

FREQUENCY – Hz

Figure 8. Signal/(Noise and Distortion) vs. Frequency

T he accuracy in sampling high frequency signals is also con-

strained by the distortion and noise created by the sample-and

hold. T he level of distortion increases with frequency and re-

duces the “effective number of bits” of the conversion.

REV. A

–7–

1...4 5 678

下载PDF

与AD781*相关器件

型号	品牌	描述	获取价格	数据表
AD7810	ADI	2.7 V to 5.5 V, 2 us, 10-Bit ADC in 8-Lead microSOIC/DIP	获取价格
AD7810YN	ADI	2.7 V to 5.5 V, 2 us, 10-Bit ADC in 8-Lead microSOIC/DIP	获取价格
AD7810YN	ROCHESTER	1-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8, 0.300 INCH, MINI, PLASTIC,	获取价格
AD7810YNZ	ROCHESTER	1-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8, 0.300 INCH, MINI, PLASTIC,	获取价格
AD7810YR	ADI	2.7 V to 5.5 V, 2 us, 10-Bit ADC in 8-Lead microSOIC/DIP	获取价格
AD7810YR	ROCHESTER	1-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8, SOIC-8	获取价格

产品中心

服务支持

精选活动

关于我们

帮助中心

AD781*

AD781* 技术参数

AD781* 数据手册

与AD781*相关器件

与AD781*相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

AD781*

AD781* 技术参数

AD781* 数据手册

与AD781*相关器件

与AD781*相关文章

您还可以找

您在本页遇到什么问题？