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| 型号： | TLV1548CDBRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封装： | GREEN, PLASTIC, SSOP-20 |
| 文件页数： | 24/37页 |
| 文件大小： | 693K |
| 代理商： | TLV1548CDBRG4 |
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TLV1544C, TLV1544I, TLV1548C, TLV1548I, TLV1548M
LOW-VOLTAGE 10-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 4/8 ANALOG INPUTS
SLAS139C – DECEMBER 1996 – REVISED JANUARY 1999
30
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATIONS INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 33, the time required to charge the analog input capacitance from 0 to VS
within 1/2 LSB can be derived as follows:
The capacitance charging voltage is given by:
where
Rt = Rs + ri
tc = Cycle time
V
C +
V
S
1–e
–tc RtCi
The input impedance Zi is 1 k at 5 V, and is higher (~ 5 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
–tc 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 + 1 k) × 55 pF × ln(2048)
This time must be less than the converter sample time shown in the timing diagrams. Which is 6x I/O CLK.
tch (1/2 LSB) ≤ 6x 1/fI/O
Therefore the maximum I/O CLK frequency is:
max(fI/O) = 6/tch (1/2 LSB) = 6/(ln(2048) × Rt × Ci)
(1)
(2)
(3)
(4)
(5)
(6)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TLV1548-EP | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW-VOLTAGE 10-BIT ANALOG-TO-DIGITAL CONVERTER WITH SERIAL CONTROL AND 8 ANALOG INPUTS |
| TLV1548I | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW-VOLTAGE 10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 4/8 ANALOG INPUTS |
| TLV1548IDB | 功能描述:模数转换器 - ADC 10bit A/D w/DSP Int 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 |
| TLV1548IDBG4 | 功能描述:模数转换器 - ADC 10-Bit 85 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 |
| TLV1548IDBR | 功能描述:模数转换器 - ADC 10-Bit 85 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 |
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