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參數(shù)資料
型號(hào)： TLC3574IPWG4
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 4-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
封裝： GREEN, PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 9/49頁(yè)
文件大小： 1137K
代理商： TLC3574IPWG4
TLC3574, TLC3578, TLC2574, TLC2578
5V ANALOG, 3/5V DIGITAL, 14/12BIT, 200KSPS, 4/8CHANNEL
SERIAL ANALOGTODIGITAL CONVERTERS WITH ±10V INPUTS
SLAS262C OCTOBER 2000 REVISED MAY 2003
17
WWW.TI.COM
circuit description
converter
The converters include a successive-approximation ADC utilizing a charge redistribution DAC. Figure 5 shows
a simplified block diagram of the ADC. The sampling capacitor acquires the signal on Ain during the sampling
period. When the conversion process starts, the control logic directs the charge redistribution DAC to add and
subtract fixed amounts of charge from the sampling capacitor to bring the comparator into a balanced condition.
When balanced, the conversion is complete and the ADC output code is generated.
Charge
Redistribution
DAC
Control
Logic
_
+
REFM
Ain
ADC Code
C(sample)
Figure 5. Simplified Block Diagram of the Successive-Approximation System
analog input range and internal test voltages
TLC3578 and TLC2578 have 8 analog inputs (TLC3574 and TLC2574 have 4) and three test voltages. The
inputs are selected by the analog multiplexer according to the command entered (see Table 1). The input
multiplexer is a break-before-make type to reduce input-to-input noise injection resulting from channel
switching.
All converters are specified for bipolar input range of
±10 V. The input signal is scaled to 0–4 V at the SAR ADC
input via the bipolar scaling circuit (see the functional block diagram and the equivalent analog input circuit):
–10 V to 0 V, 10 V to 4 V, and 0 V to 2 V.
analog input mode
Two input signal modes can be selected: single-ended input and pseudodifferential input.
_
+
Charge
Redistribution
DAC
Control
Logic
Ain(+)
REFM
ADC Code
S1
Ain()
When sampling, S1 is closed and S2 connects to Ain().
During conversion, S1 is open and S2 connects to REFM.
Figure 6. Simplified Pseudodifferential Input Circuit
Pseudodifferential input refers to the negative input, Ain(). Its voltage is limited in magnitude to
±1 V. The input
frequency limit of Ain() is the same as the positive input Ain(+). This mode is normally used for ground noise
rejection or dc offset.
相關(guān)PDF資料
PDF描述
TLC2574IPWG4 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC3578IDWR 8-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO24
TLC2574IDW 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC3574IDW 4-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLC2578IPW 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLC3574IPWR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Serial Out Low Power 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
TLC3574IPWRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Serial Out Low Power 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
TLC3578 制造商:TI 制造商全稱:Texas Instruments 功能描述:5-V ANALOG 3-/5-V DIGITAL 14-/12-BIT 200-KSPS 4-/8-CHANNEL SERIAL ANALOG TO DIGITAL CONVERTERS WITH 10-V INPUTS
TLC3578EVM 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 TLC3578 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
TLC3578IDW 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Serial Out Low Power 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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