Range vs VREF
參數(shù)資料
型號(hào)： ADS8361EVM
廠商： Texas Instruments
文件頁(yè)數(shù)： 3/29頁(yè)
文件大?。?/td> 0K
描述： EVAL MOD FOR ADS8361
產(chǎn)品培訓(xùn)模塊： Data Converter Basics
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 2
位數(shù)： 16
采樣率（每秒）： 500k
數(shù)據(jù)接口： 串行
輸入范圍： 0 ~ 5 V
在以下條件下的電源（標(biāo)準(zhǔn)）： 150mW @ 500kSPS
工作溫度： -40°C ~ 125°C
已用 IC / 零件： ADS8361
已供物品： 板
產(chǎn)品目錄頁(yè)面： 893 (CN2011-ZH PDF)
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其它名稱： 296-19922
ADS8361EVM-ND
ADS8361
11
SBAS230E
www.ti.com
FIGURE 3.Single-Ended Input: Common-Mode Voltage
Range vs VREF.
FIGURE 2. Using the ADS8361 in the Single-Ended and Differential Input Modes.
FIGURE 4. Differential Input: Common-Mode Voltage
Range vs VREF.
In each case, care should be taken to ensure that the output
impedance of the sources driving the +IN and –IN inputs are
matched. Otherwise, this may result in offset error, gain error,
and linearity error which will change with both temperature
and input voltage.
The input current on the analog inputs depend on a number
of factors: sample rate, input voltage, and source impedance.
Essentially, the current into the ADS8361 charges the inter-
nal capacitor array during the sampling 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 (25pF) to a 16-bit settling
level within 4 clock cycles. When the converter goes into the
hold mode, the input impedance is greater than 1GΩ.
Care must be taken regarding the absolute analog input
voltage. The +IN and –IN inputs should always remain within
the range of AGND – 0.3V to AVDD + 0.3V.
CM + VREF
+VREF
–VREF
Single-Ended Inputs
t
+IN
CM Voltage
CM – VREF
CM + 1/2 VREF
Differential Inputs
NOTES: Common-Mode Voltage (Differential Mode) =
, Common-Mode Voltage (Single-Ended Mode) = IN–.
(+IN) + (–IN)
2
The maximum differential voltage between +IN and –IN of the ADS8361 is VREF. See Figures 3 and 4 for a further
explanation of the common voltage range for single-ended and differential inputs.
t
+IN
–IN
CM Voltage
CM – 1/2 VREF
–IN = CM Voltage
+VREF
–VREF
1.0
1.2
2.0
2.5
2.6
3.0
VREF (V)
Common
Voltage
Range
(V)
–1
0
1
2
3
4
5
2.7
2.3
4.1
0.9
AVDD = 5V
Single-Ended Input
1.0
1.2
2.0
2.5
2.6
3.0
VREF (V)
Common
Voltage
Range
(V)
–1
0
1
2
3
4
5
4.7
0.3
AVDD = 5V
4.0
1.0
Differential Input
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ADS8361IBDBQR 制造商:Texas Instruments 功能描述:DUAL 250KHZ-16 BIT, 2+2 CHANNEL - Tape and Reel
ADS8361IDBQ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 500 kSPS 2 ADC 4ch ser out 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
ADS8361IDBQG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 500 kSPS 2 ADC 4ch ser out 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
ADS8361IDBQR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 500 kSPS 2 ADC 4ch ser out 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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