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參數(shù)資料
| 型號(hào)： | AD781* |
| 元件分類： | 取樣保持放大器 |
| 英文描述： | Complete 700 ns Sample-and-Hold Amplifier |
| 中文描述： | 完成700納秒采樣保持放大器 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 153K |
AD781
REV. A
–7–
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.
NOISE CHARACT E RIST ICS
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.
300
0
1k
10M
200
100
10k
1M
100k
FREQUENCY – Hz
O
μ
V
Figure 5. RMS Noise vs. Input Bandwidth of ADC
DRIVING T HE ANALOG INPUT S
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 k
) 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.
HIGH FRE QUE NCY SAMPLING
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.
A graph showing the magnitude of the jitter induced error vs.
frequency of the input signal is given in Figure 6.
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.
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.
1%
1k
1M
0.1%
0.01%
10k
FREQUENCY – Hz
100k
APERTURE JITTER TYPICAL AT 50ps
1/2 BIT @
8 BITS
1/2 BIT @
10 BITS
1/2 BIT @
12 BITS
1/2 BIT @
14 BITS
Figure 6. Error Magnitude vs. Frequency
–65
–95
1M
–80
–90
1k
–85
100
–70
–75
100k
10k
FREQUENCY – Hz
T
Figure 7. Total Harmonic Distortion vs. Frequency
90
0
100k
20
10
1k
100
30
40
50
60
70
80
10k
FREQUENCY – Hz
S
Figure 8. Signal/(Noise and Distortion) vs. Frequency
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD781JN | Complete 700 ns Sample-and-Hold Amplifier |
| AD781 | ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84% |
| AD781AN | Complete 700 ns Sample-and-Hold Amplifier |
| AD781SQ | Complete 700 ns Sample-and-Hold Amplifier |
| AD7828BCHIPS | 1.2A, High Efficiency Step-Down DC/DC Converter; Package: SO; No of Pins: 14; Temperature Range: 0°C to +70°C |
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