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參數資料
| 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的模擬數字轉換器 |
| 文件頁數： | 20/27頁 |
| 文件大?。?/td> | 1031K |
| 代理商： | ADS5444_07 |
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www.ti.com
18 pF
13-Bit
250 MSPS
A
IN
ADS5444
A
IN
V
REF
+5V
THS4509
CM
348
348
100
100
78.9
V
IN
From
50
Source
49.9
49.9
78.9
49.9
49.9
0.22
μ
F
0.22
μ
F
0.1
μ
F
0.1
μ
F
0.22
μ
F
Clock Inputs
The ADS5444 clock input can be driven with either a differential clock signal or a single-ended clock input, with
little or no difference in performance between both configurations. In low input frequency applications, where jitter
may not be a big concern, the use of single-ended clock (see
Figure 36
) could save some cost and board space
without any trade-off in performance. When driven on this configuration, it is best to connect CLK to ground with
a 0.01
μ
F capacitor, while CLK is ac-coupled with a 0.01
μ
F capacitor to the clock source, as shown in
Figure 36
.
CLK
ADS5444
CLK
Square Wave or
Sine Wave
0.01
μ
F
0.01
μ
F
ADS5444
SLWS162A–AUGUST 2005–REVISED FEBRUARY 2006
Application Information (continued)
Figure 35. Using the THS4509 With the ADS5444
Besides the OPA695, Texas Instruments offers a wide selection of single-ended operational amplifiers that can
be selected depending on the application. An RF gain block amplifier, such as Texas Instrument's THS9001, can
also be used with an RF transformer for high input frequency applications. For applications requiring dc-coupling
with the signal source, a differential input/differential output amplifier like the THS4509 (see
Figure 35
) is a good
solution as it minimizes board space and reduces the number of components.
In this configuration, the THS4509 amplifier circuit provides 10 dB of gain, converts the single-ended input to
differential, and sets the proper input common-mode voltage to the ADS5444.
The 50
resistors and 18 pF capacitor between the THS4509 outputs and ADS5444 inputs (along with the input
capacitance of the ADC) limit the bandwidth of the signal to about 70 MHz (-3 dB).
Input termination is accomplished via the 78.9
resistor and 0.22
μ
F capacitor to ground in conjunction with the
input impedance of the amplifier circuit. A 0.22
μ
F capacitor and 49.9
resistor is inserted to ground across the
78.9
resistor and 0.22
μ
F capacitor on the alternate input to balance the circuit.
Gain is a function of the source impedance, termination, and 348
feedback resistor. See the THS4509 data
sheet for further component values to set proper 50
termination for other common gains.
Since the ADS5444 recommended input common-mode voltage is +2.4 V, the THS4509 is operated from a
single power supply input with V
= +5 V and V
S-
= 0 V (ground). This maintains maximum headroom on the
internal transistors of the THS4509.
Figure 36. Single-Ended Clock
20
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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 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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:數據轉換 IC 開發(fā)工具 ADS5444 Eval Mod RoHS:否 制造商:Texas Instruments 產品: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:模數轉換器 - ADC 13 BIT 250MSPS ADC RoHS:否 制造商:Texas Instruments 通道數量: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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