參數(shù)資料
型號(hào)： TLC1543CFNG3
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： ADC
英文描述： 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC20
封裝： GREEN, PLASTIC, LCC-20
文件頁(yè)數(shù)： 11/32頁(yè)
文件大?。?/td> 770K
代理商： TLC1543CFNG3
www.ti.com
SIMPLIFIED ANALOG INPUT ANALYSIS
VC = VS 1e
t c/RtCi
(
)
where
Rt = Rs + ri
(1)
VC (1/2 LSB) = VS (VS/2048)
(2)
VS (VS/2048) = VS 1e
(
)
t c/RtCi
and
tc (1/2 LSB) = Rt × Ci × ln(2048)
(3)
tc (1/2 LSB) = (Rs + 1 k) × 60 pF × ln(2048)
(4)
Rs
ri
VS
VC
1 k
MAX
Driving Source
TLC1542/3
Ci
50 pF MAX
VI
VI = Input Voltage at A0A10
VS = External Driving Source Voltage
Rs = Source Resistance
ri = Input Resistance
Ci = Equivalent Input Capacitance
Driving source requirements:
Noise and distortion for the source must be equivalent to the
resolution of the converter.
Rs must be real at the input frequency.
SLAS052G – MARCH 1992 – REVISED JANUARY 2006
APPLICATION INFORMATION (continued)
Using the equivalent circuit in Figure 17Figure 17, the time required to charge the analog input capacitance from
0 to VS within 1/2 LSB can be derived as follows:
The capacitance charging voltage is given by
The final voltage to 1/2 LSB is given by
Equating equation 1 to equation 2 and solving for time tc gives
Therefore, with the values given the time for the analog input signal to settle is
This time must be less than the converter sample time shown in the timing diagrams.
Figure 17. Equivalent Input Circuit Including the Driving Source
19
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TLC1543CFNRG3 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10B 38kSPS ADC 11Ch 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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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TLC1543-EP 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11ANALOG INPUTS
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