參數(shù)資料
型號(hào)： TLV1504IPWLE
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： ADC
英文描述： 4-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
封裝： PLASTIC, TSSOP-16
文件頁(yè)數(shù)： 29/42頁(yè)
文件大?。?/td> 638K
代理商： TLV1504IPWLE
TLV1504, TLV1508
2.7 V TO 5.5 V, 10-BIT, 200 KSPS, 4/8 CHANNEL, LOW POWER,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
SLAS251 – DECEMBER 1999
35
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
Rs
ri
VS
VC
Driving Source
TLV1504/08
Ci
VI
VI = Input Voltage at AIN
VS = External Driving Source Voltage
Rs = Source Resistance
ri = 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.
Figure 40. Equivalent Input Circuit Including the Driving Source
maximum conversion throughput
For a supply voltage of 5 V, if the source impedance is less than 1 k
, and the ADC analog input capacitance
Ci is less than 50 pF, this equates to a minimum sampling time tch(0.5 LSB) of 0.571
s (t1s). Since the
sampling time requires 12 SCLKs, the fastest SCLK frequency is 12/tch = 12 MHz.
The minimal total cycle time is given as:
tc
+ tcommand ) tch ) tconv ) td(EOCH–CSL) + 4
1
f (SCLK)
) 12
1
f (SCLK)
) 3.25 ms ) 0.1 ms
+ 16
1
12
MHz
) 3.35 ms + 4.68 ms
This is equivalent to a maximum throughput of ~200 KSPS. The throughput can be even higher with a smaller
source impedance.
When source impedance is 100
, the minimum sampling time becomes:
tch (1 2 LSB)
+ Rt
Ci
In(2048)
+ 0.23 ms
The maximum SCLK frequency possible is 12/tch = 52 MHz. Then a 20 MHz clock (maximum SCLK frequency
for the TLV1504/1508 ) can be used. The minimal total cycle time is then reduced to:
tc
+ tcommand ) tch ) tconv ) td(EOCH–CSL) + 4
1
f (SCLK)
) 12
1
f (SCLK)
) 3.25 ms ) 0.1 ms
+ 0.8 ms ) 3.35 ms + 4.15 ms
The maximum throughput is 1/4.15
s ~ 240 KSPS for this case.
相關(guān)PDF資料
PDF描述
TLV1508IPWLE 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLV1508IDWRG4 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLV1508IDW 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
TLV1504IPWR 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(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
TLV1504IPWRG4 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(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
TLV1508 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:2.7 V TO 5.5 V, 10-BIT, 200 KSPS, 4/8 CHANNEL, LOW POWER, SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
TLV1508IDW 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10bit 200KSPS SAR 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
TLV1508IDWG4 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(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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