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| 型号： | TLV5535IPWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封装： | GREEN, PLASTIC, TSSOP-28 |
| 文件页数： | 6/35页 |
| 文件大小： | 723K |
| 代理商： | TLV5535IPWR |
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TLV5535
8-BIT, 35 MSPS, LOW-POWER ANALOG-TO-DIGITAL CONVERTER
SLAS221 – JUNE 1999
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLE OF OPERATION
analog input (continued)
So, for applications running at a lower fCLK, the total source resistance will increase proportionally.
AIN
CI
S1
RSW
RS
VS
TLV5535
Figure 12. Simplified Equivalent Input Circuit
dc coupled input
For dc-coupled systems an op amp can level-shift a ground-referenced input signal. A circuit as shown in
Figure 13(a) is acceptable. Alternatively, the user might want a bipolar shift together with the bottom reference
voltage as seen in Figure 13(b). In this case the AIN voltage is given by:
AIN
+ 2
R
2 ÷
R
1 )
R
2
V
REF
–V
IN
_
+
AVDD
VIN
REFTI
REFTO
REFBI
REFBO
AIN
TLV5535
_
+
VREF
VIN
REFTI
REFTO
REFBI
REFBO
AIN
TLV5535
RIN
R1
RIN
R2
(a)
(b)
Figure 13. DC-Coupled Input Circuit
ac coupled input
For many applications, especially in single supply operation, ac coupling offers a convenient way for biasing
the analog input signal at the proper signal range. Figure 14 shows a typical configuration. To maintain the
outlined specifications, the component values need to be carefully selected. The most important issue is the
positioning of the 3-dB high-pass corner point f–3 dB, which is a function of R2 and the parallel combination of
C1 and C2, called Ceq. This is given by the following equation:
f
–3 dB +
1
÷ 2π xR
2
xCeq
where Ceq is the parallel combination of C1 and C2.
Since C1 is typically a large electrolytic or tantalum capacitor, the impedance becomes inductive at higher
frequencies. Adding a small ceramic or polystyrene capacitor, C2 of approximately 0.01
F, which is not
inductive within the frequency range of interest, maintains low impedance. If the minimum expected input signal
frequency is 20 kHz, and R2 equals 1 k
and R1 equals 50 , the parallel capacitance of C1 and C2 must be
a minimum of 8 nF to avoid attenuating signals close to 20 kHz.
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相关代理商/技术参数 |
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| TLV5535IPWRG4 | 功能描述:模数转换器 - ADC 8 Bit 35 MSPS Single Ch. Low 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 |
| TLV5535IPWRG4Q1 | 功能描述:模数转换器 - ADC 8 Bit 35MSPS ADC Sgl Ch Low 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 |
| TLV5535IPWRQ1 | 功能描述:模数转换器 - ADC Auto Cat 8B 35MSPS ADC Sgl Ch. 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 |
| TLV5535PW | 制造商:TI 制造商全称:Texas Instruments 功能描述:8-BIT, 35 MSPS, LOW-POWER ANALOG-TO-DIGITAL CONVERTER |
| TLV5535-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:8-BIT, 35 MSPS, LOW-POWER ANALOG-TO-DIGITAL CONVERTER |
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