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參數(shù)資料
| 型號： | ADS800 |
| 英文描述： | 12-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 12位，40MHz的采樣模擬數(shù)字轉換器 |
| 文件頁數(shù)： | 14/17頁 |
| 文件大?。?/td> | 368K |
| 代理商： | ADS800 |
ADS800
SBAS035B
14
www.ti.com
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
ADS800 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 ADS800 is a high performance converter and careful
attention to test techniques is necessary to achieve accurate
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 ADS800. 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 over-range 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
HarmonicPower first
Noise
harmonics
+
)
2.
Signal-to-Noise Ratio (SNR):
10logSinewave SignalPower
NoisePower
3.
Intermodulation Distortion (IMD):
10
5
log
Pr
HighestIMD
oductPower to th
Sinewave SignalPower
order
)
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. Optional External Reference to Set the Full-Scale Range Utilizing a Dual, Single-Supply Op Amp.
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
A
1
A
2
1/2
OPA2234
Bottom
Reference
Top
Reference
REF1004
+1.25V
10k
10k
(1)
10k
(1)
NOTE: (1) Use parts alternatively for adjustment capability.
相關PDF資料 |
PDF描述 |
|---|---|
| ADS800U | 12-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS826E(1) | 10-Bit, 60MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS823 | IC,PERIPHERAL DRIVER,1 DRIVER,TSSOP,6PIN,PLASTIC |
| ADS823E | 10-Bit, 60MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADS800E | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADS800E/1K | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADS800U | 功能描述:模數(shù)轉換器 - ADC 12-Bit 40 MSPS SE/Diff inputs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS800U/1K | 功能描述:模數(shù)轉換器 - ADC 12-Bit 40 MSPS SE/Diff inputs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS800U/1KG4 | 功能描述:模數(shù)轉換器 - ADC 12-Bit 40 MSPS SE/Diff inputs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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