參數(shù)資料
型號(hào)： TLV1571CPW
廠商： Texas Instruments, Inc.
英文描述： 2.7 V TO 5.5 V, 1-/8-CHANNEL, 10-BIT, PARALLEL ANALOG-TO-DIGITAL CONVERTERS
中文描述： 2.7 V至5.5 V，1-/8-CHANNEL，10位，并行模擬數(shù)字轉(zhuǎn)換器
文件頁數(shù)： 17/29頁
文件大小： 434K
代理商： TLV1571CPW
TLV1571, TLV1578
2.7 V TO 5.5 V, 1-/8-CHANNEL, 10-BIT,
PARALLEL ANALOG-TO-DIGITAL CONVERTERS
SLAS170C –MARCH 1999 – REVISED FEBRUARY 2000
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
simplified analog input analysis
Using the equivalent circuit in Figure 9, the time required to charge the analog input capacitance from 0 to V
S
within 1/2 LSB, t
ch
(1/2 LSB), can be derived as follows.
The capacitance charging voltage is given by:
Where:
R
t
= R
s
+ R
i
R
i
= R
i(ADC)
+ R
i(MUX)
t
ch
= Charge time
The input impedance R
i
is 718
at 5 V, and is higher (~ 1.25 k
) at 2.7 V. The final voltage to 1/2 LSB is given
by:
VC(t)
VS1–e–tchRtCi
V
C
(1/2 LSB) = V
S
– (V
S
/2048)
Equating equation 1 to equation 2 and solving for cycle time t
c
gives:
and time to change to 1/2 LSB (minimum sampling time) is:
t
ch
(1/2 LSB) = R
t
×
C
i
×
ln(2048)
VS
VS2048
VS1–e–tchRtCi
Where:
ln(2048) = 7.625
Therefore, with the values given, the time for the analog input signal to settle is:
t
ch
(1/2 LSB) = (R
s
+ 718
)
×
15 pF
×
ln(2048)
This time must be less than the converter sample time shown in the timing diagrams, which is 6x SCLK.
t
ch
(1/2 LSB)
≤
6x 1/f
(SCLK)
Therefore the maximum SCLK frequency is:
Max(f
(SCLK)
) = 6/t
ch
(1/2 LSB) = 6/(ln(2048)
×
R
t
×
C
i
)
(1)
(2)
(3)
(4)
(5)
(6)
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TLV1571IDW 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10bit 1.2 MSPS PA 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
TLV1571IDWG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10bit 1.2 MSPS PA 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
TLV1571IPW 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10bit 1.2 MSPS PA 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
TLV1571IPWG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 1-Ch 10-Bit 1.25MSPS 8-Ch DSP/SPI 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
TLV1572 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.7 V TO 5.5 V, 10-BIT, 1.25 MSPS SERIAL ANALOG-TO-DIGITAL CONVERTER WITH AUTO-POWERDOWN
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