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參數(shù)資料
| 型號： | TLV2544EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 12-BIT ADC EVALUATION MODULE(12位ADC評估板) |
| 中文描述： | 12位ADC評估板（12位ADC的評估板） |
| 文件頁數(shù)： | 27/36頁 |
| 文件大小： | 775K |
| 代理商： | TLV2544EVM |
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Circuit Function
3-5
Circuit Description
3.2
Circuit Function
The following paragraphs describe the function of individual circuits.
3.2.1
Inputs
The TLV1504/1544/2544/TLC1514/2554 has four analog inputs; A0, A1, A2,
and A3. While the TLV1508/2548/TLC1518/2558 has eight input channels;
A0–A7. The applied input signal connects to these inputs as follows:
A0. One operational amplifier of a single-supply TLV2772 is used to scale
the input analog signal and the dynamic range of the output is compressed
to 0 V–5 V over a wide range of input levels (0 V –
±
10 V and zero dc input
offset). The second TLV2772 op amp is used to buffer the A0 input signal.
A1. A TLE2142 dual-supply operational amplifier is used to scale the wide
ranging(0 V–
±
10 V) signal connected to the A1 input. The operational
amplifier receives external input through J2.
A2–A7. These inputs are available for user-defined inputs. The external
inputs to these channels are applied through J1, J4 through J7, respec-
tively. It is important to note that each input channel has a low-pass filter.
The filter RC components can be adjusted to suit the application.
3.2.2
A0 – External Input via Input Scaling and Voltage Follower Operational
Amplifiers
It should be noted that for AV
DD
= 5 V there is a 2.5 V dc offset voltage,
produced by the node voltage of the voltage divider (R5/R6) multiplied by the
amplifier gain, at the input of channel A0. The offset is used to convert the
bipolar input to a single-ended input needed by the ADC. It is assumed that
the analog input signal is free of dc offset. If the incoming analog signal has
a dc offset, then the ADC REF– voltage is typically adjusted to the same value
as the input signal dc offset voltage and REF+ is raised by the same amount.
Since REF+ max is 5 V, a sinusoid input signal of
±
8Vpp and 0.5 V dc offset
produces full-scale from the ADC. By ac-coupling the input to J3, the dynamic
range of the input increases.
3.2.3
A1 – External Input via Dual Supply Operational Amplifiers Used for Input
Scaling and Buffering
The inverting input of one TLE2142 operational amplifier is connected to J2
via a 40.2K resistor, and signal from this amplifier (gain = 0.25) is buffered by
a second TLE2142 op amp used to drive input A1. This arrangement
minimizes the interaction between A1 and the output of the first operational
amplifier. With an input power supply of
±
7 V or greater, this amplifier
configuration produces a linear signal from 0 V to 5 V. This signal does not
approach the amplified nonlinearity limits when operating close to the supply
rail voltages. Input A1 is protected from voltages below and above the ADC
supply by two diodes. Also input A1 is low-pass filtered and the filter 3 dB cutoff
frequency should be set to pass the desired input signal.
The amplifier noninverting input signal has a quiescent value of AVDD/2 for
proper midpoint biasing for the ADC. When using the amplifier with direct
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| TLV2544ID | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12bit 200KSPS SAR 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLV2544IDG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 200 kSPS Serial 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLV2544IDR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 200 kSPS Serial 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLV2544IDRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 200 kSPS Serial 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLV2544IPW | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12bit 200KSPS SAR 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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