參數(shù)資料
型號(hào)： 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(yè)數(shù)： 13/28頁(yè)
文件大?。?/td> 1129K
代理商： ADS8342IBPFBTG4
ADS8342
SBAS277 – MAY 2003
www.ti.com
20
Figure 27. Ideal Conversion Characteristics (VCM = 0V and VREF = 2.5V)
LAYOUT
For optimum performance, care should be taken with the
physical layout of the ADS8342 circuitry. This is
particularly true if the ADC is approaching the maximum
throughput rate.
During the ADC conversion, the basic SAR architecture is
sensitive to glitches or sudden changes in the power
supply, reference, ground connections, and digital inputs.
Such glitches might originate from switching power
supplies, nearby digital logic, or high power devices. The
degree of error in the digital output depends on the
reference voltage, layout, and the exact timing of the
external event. The digital output error can change if the
external event changes in time with respect to the CLK
input.
With this in mind, power to the ADS8342 must be quiet and
well bypassed. The 0.1
F ceramic bypass capacitors
should be placed as close to the device as possible.In
addition, a 1
F to 4.7F capacitor is recommended. If
needed, an even larger capacitor and a 5
or 10 series
resistor can be used to low-pass filter a noisy supply.
The ADS8342 draws very little current from an external
reference because the reference voltage is internally
buffered. The VREF pin should be bypassed with a 0.22
F
capacitor. An additional larger capacitor can also be used,
if desired. If the reference voltage originates from an op
amp, make sure that it can drive the bypass capacitor or
capacitors without oscillation.
The REFGND and GND pins should be connected to a
quiet ground. In many cases, this will be the analog
ground. Avoid connections that are too near to the
grounding point of a microcontroller or DSP. The ideal
layout should include an analog ground plane dedicated to
the converter and associated analog circuitry.
相關(guān)PDF資料
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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
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