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參數(shù)資料
| 型號(hào)： | ADS8482IBRGZR |
| 英文描述： | 18-BIT, 1-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE, REFERENCE |
| 中文描述： | 18位，1 MSPS的，偽雙極，全差分輸入，微采樣模擬到數(shù)字轉(zhuǎn)換并行接口，參考 |
| 文件頁數(shù)： | 20/31頁 |
| 文件大?。?/td> | 647K |
| 代理商： | ADS8482IBRGZR |
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PRINCIPLES OF OPERATION
REFERENCE
The ADS8482 can operate with an external reference with a range from 3.0 V to 4.2 V. The reference voltage on
the input pin #13 (REFIN) of the converter is internally buffered. A clean, low noise, well-decoupled reference
voltage on this pin is required to ensure good performance of the converter. A low noise band-gap reference like
the REF3240 can be used to drive this pin. A 0.1-
μ
F decoupling capacitor is required between REFIN and
REFM pins (pin #13 and pin #12) of the converter. This capacitor should be placed as close as possible to the
pins of the device. Designers should strive to minimize the routing length of the traces that connect the terminals
of the capacitor to the pins of the converter. An RC network can also be used to filter the reference voltage. A
100-
series resistor and a 0.1-
μ
F capacitor, which can also serve as the decoupling capacitor can be used to
filter the reference voltage.
ADS8482
REFIN
REFM
0.1 F
m
100
W
REF3240
_
+
830 pF
To CDAC
To CDAC
10 k
W
300 pF
REFIN
REFM
ADS8482
SLAS386A–JULY 2005–REVISED JUNE 2006
The ADS8482 is a high-speed successive approximation register (SAR) analog-to-digital converter (ADC). The
architecture is based on charge redistribution which inherently includes a sample/hold function. See
Figure 35
for the application circuit for the ADS8482.
The conversion clock is generated internally. The conversion time of 650 ns is capable of sustaining a 1 MHz
throughput.
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.
Figure 37. ADS8482 Using External Reference
The ADS8482 also has limited low pass filtering capability built into the converter. The equivalent circuitry on the
REFIN input ia as shown in
Figure 38
.
Figure 38. Simplified Reference Input Circuit
The REFM input of the ADS8482 should always be shorted to AGND. A 4.096-V internal reference is included.
When internal reference is used, pin 14 (REFOUT) is connected to pin 13 (REFIN) with an 0.1-
μ
F decoupling
capacitor and 1-
μ
F storage capacitor between pin 14 (REFOUT) and pins 11 and 12 (REFM) (see
Figure 36
).
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 14 (REFOUT) can be left unconnected (floating) if external
reference is used.
20
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| ADS8482IBRGZRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 1MSPS Parall ADC w/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 |
| ADS8482IBRGZT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 1MSPS Parall ADC w/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 |
| ADS8482IBRGZTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 1MSPS Parall ADC w/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 |
| ADS8482IRGZR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 1MSPS Parall ADC w/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 |
| ADS8482IRGZRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 1MSPS Parall ADC w/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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