- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄165354 > ADS8342IBPFBTG4 (TEXAS INSTRUMENTS INC) 4-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP48 PDF資料下載
參數(shù)資料
| 型號： | ADS8342IBPFBTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 4-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | GREEN, PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 1129K |
| 代理商： | ADS8342IBPFBTG4 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁當(dāng)前第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
ADS8342
SBAS277 – MAY 2003
www.ti.com
16
±
Figure 22. Pseudo-Differential Input Mode of the ADS8342
The range of the COMMON input is limited to –0.1V to
+0.1V. Due to this, the differential input can be used to
reject signals that are common to both inputs in the
specified range. Thus, the COMMON input is best used to
sense a remote signal ground that may move slightly with
respect to the local ground potential.
The general method for driving the analog input of the
ADS8342 is shown in Figure 23 and Figure 24. The
COMMON input is held at the common-mode voltage. The
AINx input swings from COMMON – VREF to COMMON +
VREF, and the peak-to-peak amplitude is 2 x VREF.
Figure 23. Method for Driving the ADS8342
The input current required by the analog inputs depends
on a number of factors, such as sample rate, input voltage,
and source impedance. Essentially, the current into the
ADS8342 analog inputs 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 (20pF) to a 16-bit settling level within
3 clock cycles (600ns). When the converter goes into hold
mode, the input impedance is greater than 1G
.
Care must be taken regarding the absolute analog input
voltage. To maintain the linearity of the converter, the
COMMON input should not drop below AGND – 0.1V, or
exceed AGND + 0.1V. The AINx input must always remain
within the range of COMMON – VREF to COMMON + VREF.
To minimize noise, low bandwidth input signals or
low-pass filters must be used. In each case, care must be
taken to ensure that the output impedance of the sources
driving the AINx and COMMON inputs are matched.
Often, a small capacitor (100pF) between the positive and
negative inputs helps to match their impedance. To obtain
good performance from the ADS8342, the input circuit
from Figure 24 is recommended.
Figure 24. Single-Ended Method of Interfacing
the ADS8342
REFERENCE AND REFGND INPUTS
The reference input of the ADS8342, REFIN, is buffered
with an internal reference amplifier. The reference
amplifier buffers the reference input from the switching
currents needed to charge and discharge the internal
capacitor DAC (CDAC), and therefore, the need to provide
an external reference capable of supplying these
switching currents is eliminated.
The reference ground input, REFGND, is connected directly
to the CDAC. During the conversion, currents to charge and
discharge the CDAC flow through the REFGND pin. For that
reason, it is important that REFGND has a low-impedance
connection to ground.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS8412IPFBTG4 | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP48 |
| ADS8412IBPFBTG4 | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP48 |
| ADS8412IPFBRG4 | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP48 |
| ADS8517IDWR | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PDSO28 |
| ADS8517IDW | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS8342IPFB | 制造商:Texas Instruments 功能描述: |
| ADS8342IPFBR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250 kSPS Par. Out 4 true bi ch 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 |
| ADS8342IPFBRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250 kSPS Par. Out 4 true bi ch 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 |
| ADS8342IPFBT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250 kSPS Par. Out 4 true bi ch 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 |
| ADS8342IPFBTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250 kSPS Par. Out 4 true bi ch 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。