參數(shù)資料
型號(hào)： TLV1543CFNR
廠商： Texas Instruments, Inc.
元件分類： ADC
英文描述： 3.3V 10 BIT ANALOG TO DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS
中文描述： 3.3V的10位模數(shù)轉(zhuǎn)換器與串行控制和11個(gè)模擬輸入
文件頁(yè)數(shù)： 17/26頁(yè)
文件大?。?/td> 611K
代理商： TLV1543CFNR
SLAS072E DECEMBER 1992 REVISED JANUARY 2004
17
WWW.TI.COM
APPLICATION INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 17, the time required to charge the analog input capacitance from 0 to V
S
within 1/2 LSB can be derived as follows:
The capacitance charging voltage is given by
V
C
= V
S
1et
c
/R
t
C
i
)
(1)
Where:
R
t
= R
s
+ r
i
The final voltage to 1/2 LSB is given by
(2)
V
C
(1/2 LSB) = V
S
(V
S
/2048)
Equating equation 1 to equation 2 and solving for time t
c
gives
and
t
c
(1/2 LSB) = R
t
×
C
i
×
ln(2048)
V
S
(V
S
/2048) = V
S
1e
)
(3)
t
c
/R
t
C
i
(4)
Therefore, with the values given the time for the analog input signal to settle is
(5)
t
c
(1/2 LSB) = (R
s
+ 1 k
)
×
60 pF
×
ln(2048)
This time must be less than the converter sample time shown in the timing diagrams.
Rs
ri
VS
VC
1 k
MAX
Driving Source
TLV1543
Ci
60 pF MAX
VI
VI= Input Voltage at A0A10
VS= External Driving Source Voltage
Rs= Source Resistance
ri = Input Resistance
Ci= 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.
Figure 17. Equivalent Input Circuit Including the Driving Source
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TLV1543CNE4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
TLV1543I 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3V 10 BIT ANALOG TO DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS
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