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參數(shù)資料
| 型號： | ADS5444_07 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 13-BIT 250 MSPS ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 13位250 MSPS的模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 19/27頁 |
| 文件大?。?/td> | 1031K |
| 代理商： | ADS5444_07 |
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APPLICATION INFORMATION
Theory of Operation
The ADS5444 is a 13 bit, 250 MSPS, monolithic pipeline analog to digital converter. Its bipolar analog core
operates from a 5 V supply, while the output uses a 3.3 V supply to provide LVDS compatible outputs. The
conversion process is initiated by the rising edge of the external input clock. At that instant, the differential input
signal is captured by the input track and hold (T&H) and the input sample is sequentially converted by a series of
small resolution stages, with the outputs combined in a digital correction logic block. Both the rising and the
falling clock edges are used to propagate the sample through the pipeline every half clock cycle. This process
results in a data latency of four clock cycles, after which the output data is available as a 13 bit parallel word,
coded in offset binary format.
Input Configuration
The analog input for the ADS5444 consists of an analog differential buffer followed by a bipolar track-and-hold.
The analog buffer isolates the source driving the input of the ADC from any internal switching. The input common
mode is set internally through a 500
resistor connected from 2.4 V to each of the inputs. This results in a
differential input impedance of 1 k
.
For a full-scale differential input, each of the differential lines of the input signal (pins 16 and 17) swings
symmetrically between 2.4 +0.55 V and 2.4 -0.55 V. This means that each input has a maximum signal swing of
1.1 V
PP
for a total differential input signal swing of 2.2 V
PP
. The maximum swing is determined by the internal
reference voltage generator eliminating the need for any external circuitry for this purpose.
ADT1-1WT
1 : 1
AIN
AIN
ADS5444
AC Signal
Source
R
0
50
Z
0
50
R
50
R
T
100
+
OPA695
5 V
R
1
400
ADS5444
AIN
C
IN
R
IN
0.1
μ
F
1:1
5 V
R
2
57.5
V
IN
A
V
= 8V/V
(18 dB)
R
S
100
1000
μ
F
R
IN
AIN
ADS5444
SLWS162A–AUGUST 2005–REVISED FEBRUARY 2006
The ADS5444 obtains optimum performance when the analog inputs are driven differentially. The circuit in
Figure 33
shows one possible configuration using an RF transformer with termination either on the primary or on
the secondary of the transformer. If voltage gain is required, a step up transformer can be used. For voltage
gains that would require an impractical transformer turn ratio, a single-ended amplifier driving the transformer is
shown in
Figure 34
).
Figure 33. Converting a Single-Ended Input to a Differential Signal Using RF Transformers
Figure 34. Using the OPA695 With the ADS5444
19
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| AK135 | Circular Connector; No. of Contacts:8; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:12; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:12-8 RoHS Compliant: No |
| AK135-VQ | Circular Connector; No. of Contacts:10; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:12; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:12-98 RoHS Compliant: No |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS5444-EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:13-BIT 250-MSPS ANALOG-TO-DIGITAL CONVERTER |
| ADS5444EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS5444 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 |
| ADS5444EVM-CVAL | 制造商:Texas Instruments 功能描述:ADS5444EVM-CVAL - Boxed Product (Development Kits) |
| ADS5444HFGMPR | 制造商:Texas Instruments 功能描述:EVAL UNIT FOR ADS5444-SP - Bulk |
| ADS5444IPFP | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 13 BIT 250MSPS 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 |
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