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參數(shù)資料
| 型號： | ADS8481IBRGZRG4 |
| 英文描述： | 18-BIT, 1-MSPS, PSEUDO-DIFFERENTIAL UNIPOLAR INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| 中文描述： | 18位，1 MSPS的，偽差分單極輸入，微采樣模擬到數(shù)字轉(zhuǎn)換并行接口和參考 |
| 文件頁數(shù)： | 20/31頁 |
| 文件大?。?/td> | 717K |
| 代理商： | ADS8481IBRGZRG4 |
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PRINCIPLES OF OPERATION
REFERENCE
The ADS8481 can operate with an external reference with a range from 3.0 V to 4.2 V. The reference voltage on
the input pin #1 (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.
ADS8481
REFIN
REFM
0.1 F
m
100
W
REF3240
_
+
830 pF
To CDAC
To CDAC
10 k
W
300 pF
REFIN
REFM
ADS8481
SLAS385A–FEBRUARY 2006–REVISED MARCH 2006
The ADS8481 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 36
for the application circuit for the ADS8481.
The conversion clock is generated internally. The conversion time of 710 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 38. Reference Circuit
The ADS8481 also has limited low pass filtering capability built into the converter. The equivalent circuitry on the
REFIN input is as shown in
Figure 39
.
Figure 39. Reference Circuit
The REFM input of the ADS8481 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 a 0.1-
μ
F decoupling capacitor and 1-nF storage capacitor between pin 14 (REFOUT) and pins
11 and 12 (REFM) (see Figure
Figure 37
). 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 an external reference is used.
20
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS8481IBRGZT | 18-BIT, 1-MSPS, PSEUDO-DIFFERENTIAL UNIPOLAR INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| ADS8481IBRGZTG4 | 18-BIT, 1-MSPS, PSEUDO-DIFFERENTIAL UNIPOLAR INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| ADS8481IPFBR | 18-BIT, 1-MSPS, PSEUDO-DIFFERENTIAL UNIPOLAR INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| ADS8481IPFBT | 18-BIT, 1-MSPS, PSEUDO-DIFFERENTIAL UNIPOLAR INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| ADS8481IRGZR | 18-BIT, 1-MSPS, PSEUDO-DIFFERENTIAL UNIPOLAR INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS8481IBRGZT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 1-MSPS Pseudo Diff Unipolar 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 |
| ADS8481IBRGZTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 1-MSPS Pseudo Diff Unipolar 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 |
| ADS8481IPFBR | 制造商:BB 制造商全稱:BB 功能描述:18-BIT, 1-MSPS, PSEUDO-DIFFERENTIAL UNIPOLAR INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| ADS8481IPFBT | 制造商:BB 制造商全稱:BB 功能描述:18-BIT, 1-MSPS, PSEUDO-DIFFERENTIAL UNIPOLAR INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| ADS8481IRGZR | 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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