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參數(shù)資料
| 型號： | TLV571DW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 2.7 V TO 5.5 V, 1-CHANNEL, 8-BIT, PARALLEL ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 2.7 V至5.5 V，1通道，8位并行模擬到數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 15/27頁 |
| 文件大?。?/td> | 405K |
| 代理商： | TLV571DW |
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TLV571
2.7 V TO 5.5 V, 1-CHANNEL, 8-BIT,
PARALLEL ANALOG-TO-DIGITAL CONVERTER
SLAS239A – SEPTEMBER 1999 – REVISED FEBRUARY 2000
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
simplified analog input analysis
Using the equivalent circuit in Figure 10, 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)
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
/512)
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(512)
VS
VS512
VS1–e–tchRtCi
Where
ln(512) = 6.238
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(512)
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(512)
×
R
t
×
C
i
)
(1)
(2)
(3)
(4)
(5)
(6)
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| TLV571IDW | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8bit SAR A/D 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 |
| TLV571IDWG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8bit SAR A/D 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 |
| TLV571IDWR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 1.25 MSPS Single Ch. 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 |
| TLV571IDWRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 1.25 MSPS Single Ch. 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 |
| TLV571IPW | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8bit SAR A/D 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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