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參數(shù)資料
| 型號： | ADS5220RGZ |
| 英文描述： | 12-Bit, 40MSPS Sampling, +3.3V ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 12位，40MSPS采樣，3.3V的模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 433K |
| 代理商： | ADS5220RGZ |
ADS5220
SBAS261A
10
www.ti.com
INPUT COMMON-MODE VOLTAGE
The ADS5220 operates from a single +3.3V supply, and
requires an external common-mode voltage. This allows a
symmetrical signal swing while maintaining sufficient head-
room to the supply rails. The common-mode voltage can be
generated from an external DC voltage source (for example,
an analog +3.3V supply with a simple resistor divider), or
from the input signal source with DC-coupling. For a single-
ended input configuration, the common-mode voltage is
typically +1.25V. When the input configuration is differential,
the common-mode voltage is +1.5V.
INPUT FULL-SCALE RANGE
The input full-scale range (FSR) of the ADS5220 is select-
able from 1V
PP
to 2V
PP
and any value within this range, by
the configuration of the reference select pin RSEL and
reference voltage pin V
REF
(see Table I). The input FSR
(differential) is always twice V
REF
(the voltage at the V
REF
pin)
for all reference modes.
By choosing different signal input ranges, trade-offs can be
made between noise and distortion performance. For ex-
ample, applications requiring the maximum signal-to-noise
performance (SNR) will benefit from the 2V
PP
input range
while lower distortion may be obtain with the reduced input
range of 1V
PP
. Depending on the input driver configuration
the 1V
PP
range may also relax the requirements for the
driver, particularly for single-ended, single supply applica-
tions.
DIFFERENTIAL INPUTS
The ADS5220 input structure is designed to accept both a
single-ended or differential analog signal. However, the
ADS5220 will achieve its optimum performance when the
analog inputs are driven differentially.
Differential operation of the ADS5220 requires that an input
signal at the inputs (IN,
IN
) has the same amplitude and is
180 degrees out-of-phase. Differential signals offer a number
of advantages:
The signal amplitude is half that required for the single-
ended operation, and is therefore less demanding to achieve,
while maintaining good linearity performance from the
signal source.
The reduced signal swing allows for more headroom of the
interface circuitry, and therefore also allows a wider selec-
tion of the most suitable driver amplifier.
Minimization of even-order harmonics.
Improved noise immunity based on the common-mode
input rejection of the converter.
ANALOG INPUT
Depending on the application and the desired level of perfor-
mance, the analog input of the ADS5220 can be configured
in various ways and driven with different circuits. In any case,
the analog interface requirements should be carefully exam-
ined before selecting the appropriate circuit configuration.
The circuit definition should include considerations on the
input frequency band and amplitude, as well as the available
power supplies.
INPUT IMPEDANCE
The input impedance of the ADS5220 is capacitive due to the
input stray and sampling capacitors. These capacitors effec-
tively result in a dynamic input impedance that is a function
of the sampling and input frequency. Figure 2 depicts the
differential input impedance of the ADS5220 as a function of
the signal input frequency. For applications that use op amps
to drive the ADC, it is recommended that a series resistor be
added between the amplifier output and the converter inputs.
This will isolate the capacitive input of the converter from the
driving source and avoid gain peaking, or instability; further-
more, it will create a 1st-order, low-pass filter (LPF) in
conjunction with the specified input capacitance of the
ADS5220. The cutoff frequency of this LPF can be further
adjusted by adding an external shunt capacitor. In any case,
the use of the RC network is optional, but optimizing the
values to adapt to the specific application is encouraged.
DIFFERENTIAL INPUT IMPEDANCE
Input Frequency (Hz)
1M
10M
100M
50k
40k
30k
20k
10k
100
FIGURE 2. Differential Input Impedance vs Input Frequency.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS5221 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:12-Bit, 65MSPS Sampling, +3.3V ANALOG-TO-DIGITAL CONVERTER |
| ADS5221EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS5221 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADS5221PFBR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit 65MSPS +3.3V 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 |
| ADS5221PFBRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit 65MSPS +3.3V 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 |
| ADS5221PFBT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit 65MSPS +3.3V 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 |
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