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| 型号： | TLV1543MFKB |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CQCC20 |
| 封装： | CERAMIC, LCC-20 |
| 文件页数： | 9/29页 |
| 文件大小： | 804K |
| 代理商： | TLV1543MFKB |
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TLV1543C, TLV1543I, TLV1543M
3.3V 10BIT ANALOGTODIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SLAS072E DECEMBER 1992 REVISED JANUARY 2004
17
WWW.TI.COM
APPLICATION INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 17, 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
VC = VS 1e
t c/RtCi
(
)
(1)
Where:
Rt = Rs + ri
The final voltage to 1/2 LSB is given by
(2)
VC (1/2 LSB) = VS (VS/2048)
Equating equation 1 to equation 2 and solving for time tc gives
VS (VS/2048) = VS 1e
(
)
(3)
t c/RtCi
and
tc (1/2 LSB) = Rt × Ci × ln(2048)
(4)
Therefore, with the values given the time for the analog input signal to settle is
(5)
tc (1/2 LSB) = (Rs + 1 k) × 60 pF × ln(2048)
This time must be less than the converter sample time shown in the timing diagrams.
Rs
ri
VS
VC
1 k
MAX
Driving Source
TLV1543
Ci
VI
VI = Input Voltage at A0 A10
VS = External Driving Source Voltage
Rs = Source Resistance
ri = Input Resistance
Ci = Input Capacitance
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 17. Equivalent Input Circuit Including the Driving Source
60 pF MAX
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相关代理商/技术参数 |
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|---|---|
| TLV1543MJ | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.3V 10 BIT ANALOG TO DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS |
| TLV1543MJB | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.3V 10 BIT ANALOG TO DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS |
| TLV1544 | 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 |
| TLV1544C | 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 |
| TLV1544C_08 | 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 |
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