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參數(shù)資料
| 型號(hào)： | ADS805 |
| 英文描述： | 12-Bit, 20MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 12位，20MHz的采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 260K |
| 代理商： | ADS805 |
10
ADS805
FIGURE 5. Recommended Reference Bypassing Scheme.
FIGURE 6. Alternative Circuit to Generate Common-Mode
Voltage.
FIGURE 4. Equivalent Reference Circuit.
A simple model of the internal reference circuit is shown in
Figure 4. The internal blocks are a 1V-bandgap voltage
reference, buffer, the resistive reference ladder and the
drivers for the top and bottom reference which supply the
necessary current to the internal nodes. As shown, the output
of the buffer appears at the V
REF
pin. The full-scale input
span of the ADS805 is determined by the voltage at V
REF
,
according to the Equation 1:
Full-Scale Input Span = 2 x V
REF
Note that the current drive capability of this amplifier is
limited to approximately 1mA and should not be used to
drive low loads. The programmable reference circuit is
controlled by the voltage applied to the select pin (SEL).
Refer to Table I for an overview.
The top reference (REFT) and the bottom reference (REFB)
are brought out mainly for external bypassing. For proper
(1)
operation with all reference configurations, it is necessary to
provide solid bypassing to the reference pins in order to keep
the clock feedthrough to a minimum. Figure 5 shows the
recommended decoupling network.
In addition, the common-mode voltage (CMV) may be used
as a reference level to provide the appropriate offset for the
driving circuitry. However, care must be taken not to appre-
ciably load this node, which is not buffered and has a high
impedance. An alternate method of generating a common-
mode voltage is given in Figure 6. Here, two external
precision resistors (tolerance 1% or better) are located be-
tween the top and bottom reference pins. The common-
mode level will appear at the midpoint. The output buffers
of the top and bottom reference are designed to supply
approximately 2mA of output current.
IN
IN
REFT
R
1
CMV
R
2
0.1μF
0.1μF
ADS805
REFB
800
800
REFB
CM
Reference
Driver
Bandgap
and Logic
REFT
V
REF
SEL
1V
DC
ADS805
Resistor Network
and Switches
Disable
Switch
to A/D
to A/D
ADS805
CM
REFB
0.1
μ
F
0.1
μ
F
V
REF
0.1
μ
F
10
μ
F
+
0.1
μ
F
REFT
0.1
μ
F
10
μ
F
+
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS805E | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 20 MSPS Int/Ext Ref 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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 |
| ADS805E/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 20 MSPS Int/Ext Ref 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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 |
| ADS805E/1KG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 20 MSPS Int/Ext Ref 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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 |
| ADS805EG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 20 MSPS Int/Ext Ref 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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 |
| ADS805U | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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