參數(shù)資料
型號： TLV1570CDW
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
封裝： GREEN, SOIC-20
文件頁數(shù)： 32/32頁
文件大?。?/td> 634K
代理商： TLV1570CDW
TLV1570
2.7 V TO 5.5 V 8-CHANNEL 10-BIT 1.25-MSPS
SERIAL ANALOG-TO-DIGITAL CONVERTER
SLAS169B – DECEMBER 1997– REVISED OCTOBER 2000
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
simplified analog input analysis
Using the equivalent circuit in Figure 6, the time required to charge the analog input capacitance from 0 to VS
within 1/2 LSB, tch(1/2 LSB), can be derived as follows:
The capacitance charging voltage is given by:
Where:
Rt = Rs + Ri
Ri = Ri(ADC) + Ri(MUX)
tch = Charge time
V
C(t) +
V
S
1–e
–t
ch
RtCi
The input impedance Ri 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 (1/2 LSB) = VS – (VS/2048)
Equating equation 1 to equation 2 and solving for cycle time tc gives:
and time to change to 1/2 LSB (minimum sampling time) is:
tch (1/2 LSB) = Rt × Ci × ln(2048)
V
S *
V
S
2048
+ V
S
1–e
–t
ch
RtCi
Where:
ln(2048) = 7.625
Therefore, with the values given, the time for the analog input signal to settle is:
tch (1/2 LSB) = (Rs + 718 ) × 15 pF × ln(2048)
This time must be less than the converter sample time shown in the timing diagrams. Which is 6x SCLK.
tch (1/2 LSB) ≤ 6x 1/f(SCLK)
Therefore the maximum SCLK frequency is:
Max(f(SCLK)) = 6/tch (1/2 LSB) = 6/(ln(2048) × Rt × Ci)
Rs
Ri(MUX)
VS
VC
15 pF
Driving Source
TLC1570
Ci
VI
VI = Input Voltage at AIN
VS = External Driving Source Voltage
Rs = Source Resistance
Ri(ADC)= Input Resistance of ADC
Ri(MUX)= Input Resistance (MUX on resistance)
Ci = Input Capacitance
VC= Capacitance Charging Voltage
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.
Ri(ADC)
MO
AIN
Figure 6. Equivalent Input Circuit Including the Driving Source
(1)
(2)
(3)
(4)
(5)
(6)
相關(guān)PDF資料
PDF描述
TLV1570IPW 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLV1570CDWG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 1.25 MSPS 8-Ch DSP 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
TLV1570CDWR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 1.25 MSPS 8-Ch DSP 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
TLV1570CDWRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 1.25 MSPS 8-Ch DSP 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
TLV1570CPW 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10bit 1.25MSPS Ser 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
TLV1570CPW 制造商:Texas Instruments 功能描述:IC 10-BIT ADC ((NW))
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