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參數(shù)資料
| 型號： | ADS8406IPFBT |
| 英文描述： | 16-BIT, 1.25 MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICRO POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE |
| 中文描述： | 16位，1.25 MSPS的，偽雙極，全差分輸入，微功耗采樣模擬到數(shù)字轉(zhuǎn)換并行接口 |
| 文件頁數(shù)： | 19/25頁 |
| 文件大?。?/td> | 536K |
| 代理商： | ADS8406IPFBT |
www.ti.com
REFERENCE
The ADS8406 can operate with an external reference with a range from 2.5 V to 4.2 V. A 4.096-V internal
reference is included. When internal reference is used, pin 2 (REFOUT) should be connected to pin 1 (REFIN)
with a 0.1-μF decoupling capacitor and 1-μF storage capacitor between pin 2 (REFOUT) and pins 47 and 48
(REFM) (see Figure 33). The internal reference of the converter is double buffered. If an external reference is
used, the second buffer provides isolation between the external reference and the CDAC. This buffer is also
used to recharge all of the capacitors of the CDAC during conversion. Pin 2 (REFOUT) can be left unconnected
(floating) if external reference is used.
ANALOG INPUT
When the converter enters the hold mode, the voltage difference between the +IN and -IN inputs is captured on
the internal capacitor array. Both +IN and –IN inputs have a range of –0.2 V to V
ref
+ 0.2 V. The input span (+IN
– (–IN)) is limited to -V
ref
to V
ref
..
The input current on the analog inputs depends upon a number of factors: sample rate, input voltage, and source
impedance. Essentially, the current into the ADS8406 charges the internal capacitor array during the sample
period. After this capacitance has been fully charged, there is no further input current. The source of the analog
input voltage must be able to charge the input capacitance (25 pF) to an 16-bit settling level within the acquisition
time (150 ns) of the device. When the converter goes into the hold mode, the input impedance is greater than 1
G
.
Care must be taken regarding the absolute analog input voltage. To maintain the linearity of the converter, the
+IN and –IN inputs and the span (+IN – (–IN)) should be within the limits specified. Outside of these ranges, the
converter's linearity may not meet specifications. To minimize noise, low bandwidth input signals with low-pass
filters should be used.
+
_
+
THS4503
IN
ADS8406
IN+
_
+
V
CC+
V
CC
1 k
1 k
68 pF
68 pF
50
50
20 pF
R
G
R
S
R
T
OCM
1 k
R
G,
R
S
, and R
T
should be chosen such that
R
G +
R
S
|| R
T
= 1 k
V
OCM
= 2 V, +V
CC
= 7 V, and V
CC
= 7 V
ADS8406
SLAS426A–AUGUST 2004–REVISED DECEMBER 2004
PRINCIPLES OF OPERATION (continued)
The analog input is provided to two input pins: +IN and –IN. When a conversion is initiated, the differential input
on these pins is sampled on the internal capacitor array. While a conversion is in progress, both inputs are
disconnected from any internal function.
Care should be taken to ensure that the output impedance of the sources driving +IN and –IN inputs are
matched. If this is not observed, the two inputs could have different setting time. This may result in offset error,
gain error and linearity error which varies with temperature and input voltage.
A typical input circuit using TI's THS4503 is shown in Figure 33. Input from a single-ended source may be
converted into a differential signal for the ADS8406 as shown in the figure. In case the source itself is differential,
then the THS4503 may be used in differential input and differential output modes.
Figure 33. Using the THS4503 With the ADS8406
19
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS8406IPFBTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 1.25 MSPS Pseudo Bipolar 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 |
| ADS8406IPFFBR | 制造商:BB 制造商全稱:BB 功能描述:16-BIT, 1.25 MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICRO POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE |
| ADS8410 | 制造商:BB 制造商全稱:BB 功能描述:16-BIT, 1-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE, REFERENCE |
| ADS8410-13REF | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS8410-13REF Circuit Board 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 |
| ADS8410IBRGZR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit Unipolar Pseudo Diff Input 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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