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參數(shù)資料
| 型號： | ADS821E |
| 英文描述： | 10-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 10位，40MHz的采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 384K |
| 代理商： | ADS821E |
www.ti.com
ADS821
SBAS040B
14
results. Highly accurate phase-locked signal sources allow
high resolution FFT measurements to be made without using
data windowing functions. A low jitter signal generator, such as
the HP8644A for the test signal, phase-locked with a low jitter
HP8022A pulse generator for the A/D converter clock, gives
excellent results. Low-pass filtering (or bandpass filtering) of
test signals is absolutely necessary to test the low distortion of
the ADS821. Using a signal amplitude slightly lower than full
scale will allow a small amount of
“
headroom
”
so that noise or
DC offset voltage will not overrange the A/D converter and
cause clipping on signal peaks.
DYNAMIC PERFORMANCE DEFINITIONS
1. Signal-to-Noise-and-Distortion Ratio (SINAD):
10
15
log
(
)
Sinewave SignalPower
Harmonic Power first
Noise
harmonics
+
2. Signal-to-Noise Ratio (SNR):
10 logSinewave SignalPower
NoisePower
3. Intermodulation Distortion (IMD):
10
5
log
Pr
(
)
Highest IMD
oduct Power to th order
Sinewave SignalPower
IMD is referenced to the larger of the test signals f
1
or f
2
. Five
“
bins
”
either side of peak are used for calculation of funda-
mental and harmonic power. The
“
0
”
frequency bin (DC) is
not included in these calculations as it is of little importance
in dynamic signal processing applications.
FIGURE 10. Single-Ended Input Connection.
PC-BOARD LAYOUT AND BYPASSING
A well-designed, clean PC-board layout will assure proper
operation and clean spectral response. Proper grounding
and bypassing, short lead lengths, and the use of ground
planes are particularly important for high-frequency circuits.
Multilayer PC-boards are recommended for best perfor-
mance but if carefully designed, a two-sided PC-board with
large, heavy ground planes can give excellent results. It is
recommended that the analog and digital ground pins of the
ADS821 be connected directly to the analog ground plane. In
our experience, this gives the most consistent results. The
A/D converter power-supply commons should be tied to-
gether at the analog ground plane. Power supplies should be
bypassed with 0.1
μ
F ceramic capacitors as close to the pin
as possible.
DYNAMIC PERFORMANCE TESTING
The ADS821 is a high-performance converter and careful
attention to test techniques is necessary to achieve accurate
FIGURE 11. Optional External Reference to Set the Full-Scale Range Utilizing a Dual, Single-Supply Op Amp.
22
26
27
CM
IN
IN
ADS821
0.1
μ
F
Single-Ended
Input Signal
Full-Scale = +0.25V to +4.25V with internal references.
22pF
2k
+2.5V to +3.25V
+5V
+5V
R
P
220
R
P
220
10k
6.2k
0.1
μ
F
+2.5V
10k
1/2
OPA2234
1/2
OPA2234
A
1
A
2
Bottom
Reference
Top
Reference
REF1004
+1.25V
10k
10k
(1)
10k
(1)
NOTE: (1) Use parts alternatively for adjustment capability.
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PDF描述 |
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| ADS821U | 10-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS821E/1K | 制造商:BB 制造商全稱:BB 功能描述:10-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS821U | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 40 MSPS SE/ Diff Input RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS821U | 制造商:Texas Instruments 功能描述:10 bit sampling analog/digital converter |
| ADS821U | 制造商:Texas Instruments 功能描述:IC 10BIT ADC 40SPS 28-SOIC |
| ADS821U-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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