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参数资料
型号： TLV2544IPWLE
厂商： TEXAS INSTRUMENTS INC
元件分类： ADC
英文描述： 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
文件页数： 29/39页
文件大小： 648K
代理商： TLV2544IPWLE
TLV2544, TLV2548
2.7 V TO 5.5 V, 12-BIT, 200 KSPS, 4/8 CHANNEL, LOW POWER,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
SLAS198A –FEBRUARY 1999– REVISED AUGUST 1999
35
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
Rs
ri
VS
VC
Driving Source
TLV2544/48
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 39. 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 0.676
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)
) 3.6 ms ) 0.1 ms
+ 16
1
12
MHz
) 3.7 ms + 5.03 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(8192)
+ 0.27 ms
The maximum SCLK frequency possible is 12/tch = 44 MHz. Then a 20 MHz clock (maximum SCLK frequency
for the TLV2544/2548 ) 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)
) 3.6 ms ) 0.1 ms
+ 0.8 ms ) 3.6 ms ) 0.1 ms + 4.5 ms
The maximum throughput is 1/4.5
s = 222 KSPS for this case.
相关PDF资料
PDF描述
TLV2544CPWLE 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
TLV2548MFK 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CQCC20
TLV2548MPWREP 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLV2553IDWG4 11-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
TLV2553IPWR 11-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
相关代理商/技术参数
参数描述
TLV2544IPWR 功能描述:模数转换器 - ADC 12-Bit 200 kSPS Serial Out RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
TLV2544IPWRG4 功能描述:模数转换器 - ADC 12-Bit 200 kSPS Serial Out RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
TLV2544QD 功能描述:模数转换器 - ADC 12-Bit 200 kSPS Lo-Pwr RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
TLV2544QDG4 功能描述:模数转换器 - ADC 12B 200 kSPS ADC Ser. Out Lo Pwr RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
TLV2544QDR 功能描述:模数转换器 - ADC 12 Bit 200 kSPS Lo Pwr RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
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