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參數(shù)資料
| 型號： | ADS902E |
| 英文描述： | 10-Bit, 30MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 10位，30MHz的采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 194K |
| 代理商： | ADS902E |
9
ADS902
Again, the input coupling capacitor C
1
and resistor R
1
form
a high-pass filter. At the same time, the input impedance is
defined by R
1
. Possible op amps for A
1
are CLC452, EL2180
or LM6152. Depending on the selected amplifier, the use of
a pull-up/pull-down resistor (R
P
), located directly at its
output, may considerably improve its distortion performance.
Resistor R
S
isolates the op amp’s output from the capacitive
load to avoid gain peaking or even oscillation. It can also be
used to establish a defined bandwidth to reduce the wideband
noise. Its value is usually between 10
and 100
.
DC-COUPLED INTERFACE CIRCUIT
Shown in Figure 5 is a single-supply, DC-coupled circuit
which can be set in a gain of –1V/V or higher. Depending on
the gain determined by R
F
/R
IN
, the divider ratio set by resistors
R
1
and R
2
must be adjusted to yield the correct common-mode
voltage for the ADS902. With a +5V supply, the nominal
signal input range of the ADS902 is 1Vp-p, typically centered
around the common-mode voltage of +2.75V.
EXTERNAL REFERENCE
The ADS902 requires an external top and bottom reference
on pin 22 (REFT) and 24 (REFB). Internally those pins are
connected through a resistor ladder, which has a nominal
resistance of 4k
(
±
15%). In order to establish a correct
voltage drop across the ladder the external reference circuit
must be able to supply typically 250
μ
A of current. With this
current the full-scale input range of the ADS902 is set
between +2.25V and +3.25V. In general, the voltage drop
across REFT and REFB determines the input full-scale
range (FSR) of the ADS902. Equation (4) can be used to
calculate the span.
FSR = REFT - REFB
Depending on the application several options exist how to
supply the external reference voltages to the ADS902 with-
out degrading the typical performance.
(4)
LOW-COST REFERENCE SOLUTION
The easiest way to achieve the required reference voltages is
to place the reference ladder of the ADS902 between the
supply rails. Two additional resistors (R
T
, R
B
) are necessary
to set the correct current through the ladder (see Figure 6).
However, depending on the desired full-scale swing and
supply voltage, different resistor values might be selected.
A
1
V
IN
R
F
+V
S
R
1
0.1μF
2k
2k
IN
CM
REFB
External
Bottom Reference
REFT
R
S
R
IN
R
2
22pF
C
2
ADS902
External
Top Reference
FIGURE 5. DC-Coupled, Single-Supply Interface Circuit.
1k
1k
LpBy
REFT
REFB
LnBy
+V
S
IN
CM
R
T
7k
1k
+2.25V
R
B
9k
1k
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
+5V
V
IN
ADS902
0.1μF
+2.75V
1k
0.1μF
L1
10μF
+3.25V
FIGURE 6. Low Cost Solution to Supply External Reference Voltages.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS902E/1K | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| ADS9110EVM-PDK | 功能描述:ADS9110 - 18 Bit 2M Samples per Second Analog to Digital Converter (ADC) Evaluation Board 制造商:texas instruments 系列:- 零件狀態(tài):有效 A/D 轉(zhuǎn)換器數(shù):1 位數(shù):18 采樣率（每秒）:2M 數(shù)據(jù)接口:串行 輸入范圍:±VREF 不同條件下的功率（典型值）:15mW @ 2MSPS 使用的 IC/零件:ADS9110 所含物品:2 板，線纜 標準包裝:1 |
| ADS9110IRGER | 功能描述:18 Bit Analog to Digital Converter 1 Input 1 SAR 24-VQFN (4x4) 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 位數(shù):18 采樣率（每秒）:2M 輸入數(shù):1 輸入類型:差分 數(shù)據(jù)接口:SPI 配置:S/H-ADC 無線電 - S/H:ADC:1:1 A/D 轉(zhuǎn)換器數(shù):1 架構(gòu):SAR 參考類型:外部 電壓 - 電源，模擬:1.65 V ~ 1.95 V 電壓 - 電源，數(shù)字:1.65 V ~ 1.95 V 特性:- 工作溫度:-40°C ~ 85°C 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商器件封裝:24-VQFN（4x4） 標準包裝:1 |
| ADS9110IRGET | 功能描述:ANALOG TO DIGITAL CONVERTERS - A 制造商:texas instruments 系列:* 包裝:帶卷（TR） 零件狀態(tài):在售 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商器件封裝:24-VQFN（4x4） 標準包裝:250 |
| ADS9120EVM-PDK | 功能描述:EVAL BOARD FOR ADS9120 制造商:texas instruments 系列:- 零件狀態(tài):在售 A/D 轉(zhuǎn)換器數(shù):1 位數(shù):16 采樣率（每秒）:2.5M 數(shù)據(jù)接口:SPI 輸入范圍:±VREF 不同條件下的功率（典型值）:9mW @ 2.5MSPS 使用的 IC/零件:ADS9120 所含物品:板，電纜 標準包裝:1 |
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