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參數(shù)資料
| 型號： | ADS5510IPAP |
| 英文描述： | 11-Bit, 125-MSPS Analog-To-Digital Converter |
| 中文描述： | 11位，125 MSPS的模擬到數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 19/29頁 |
| 文件大小： | 835K |
| 代理商： | ADS5510IPAP |
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R
0
50
Z
0
50
1:1
INP
INM
CM
ADT11WT
R
50
1nF
0.1
μ
F
AC Signal
Source
10
25
25
ADS5510
600 A
f
S
(in MSPS)
125 MSPS
(1)
ADS5510
SLAS499–JANUARY 2007
This differential input topology produces a high level of ac-performance for high sampling rates. It also results in
a very high usable input bandwidth, especially important for high intermediate-frequency (IF) or undersampling
applications. The ADS5510 requires each of the analog inputs (INP, INM) to be externally biased around the
common-mode level of the internal circuitry (CM, pin 17). For a full-scale differential input, each of the differential
lines of the input signal (pins 19 and 20) swings symmetrically between CM + 0.575 V and CM – 0.575 V. This
means that each input is driven with a signal of up to CM
±
0.575 V, so that each input has a maximum
differential signal of 1.15 V
for a total differential input signal swing of 2.3 V
. The maximum swing is
determined by the two reference voltages, the top reference (REFP, pin 29), and the bottom reference (REFM,
pin 30).
The ADS5510 obtains optimum performance when the analog inputs are driven differentially. The circuit shown
in
Figure 25
illustrates one possible configuration using an RF transformer.
Figure 25. Transformer Input to Convert Single-Ended Signal to Differential Signal
The single-ended signal is fed to the primary winding of an RF transformer. Placing a 25-
resistor in series with
INP and INM is recommended to dampen ringing due to ADC kickback.
Since the input signal must be biased around the common-mode voltage of the internal circuitry, the
common-mode voltage (V
CM
) from the ADS5510 is connected to the center-tap of the secondary winding.
To ensure a steady low-noise V
CM
reference, best performance is attained when the CM output (pin 17) is
filtered to ground with a 10-
series resistor and parallel 0.1-
μ
F and 0.001-
μ
F low-inductance capacitors, as
illustrated in
Figure 24
.
Output V
CM
(pin 17) is designed to directly drive the ADC input. When providing a custom CM level, be aware
that the input structure of the ADC sinks a common-mode current in the order of 600
μ
A (300
μ
A per input).
Equation 1
describes the dependency of the common-mode current and the sampling frequency:
Where:
f
S
> 2 MSPS.
This equation helps to design the output capability and impedance of the driving circuit accordingly.
When it is necessary to buffer or apply a gain to the incoming analog signal, it is possible to combine
single-ended operational amplifiers with an RF transformer, or to use a differential input/output amplifier without
a transformer, to drive the input of the ADS5510. Texas Instruments offers a wide selection of single-ended
operational amplifiers (including the THS3201, THS3202, OPA695, and OPA847) that can be selected
depending on the application. An RF gain block amplifier, such as Texas Instruments THS9001, can also be
used with an RF transformer for high input frequency applications. The THS4503 is a recommended differential
input/output amplifier.
Table 4
lists the recommended amplifiers.
19
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS5510IPAPR | 11-Bit, 125-MSPS Analog-To-Digital Converter |
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| ADS605 | 700MHz Low Distortion, Low Noise Differential Amplifier/ADC Driver (AV = 10V/V); Package: QFN; No of Pins: 16; Temperature Range: 0°C to +70°C |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS5510IPAPG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 11B 125 MSPS ADC 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 |
| ADS5510IPAPR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 11-Bit 125 MSPS 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 |
| ADS5510IPAPRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 11B 125 MSPS ADC 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 |
| ADS-5512 | 功能描述:DC/DC轉(zhuǎn)換器 51W 12V/3A, 5V/3A DC/DC RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| ADS5517 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:11-BIT, 200 MSPS ADC |
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