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| 型号： | TLV1548CDBG4 |
| 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： | 25/37页 |
| 文件大小： | 693K |
| 代理商： | TLV1548CDBG4 |
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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
31
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATIONS INFORMATION
Rs
ri
VS
VC
55 pF MAX
1 k
Driving Source
TLV1544/48
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 40. Equivalent Input Circuit Including the Driving Source
maximum conversion throughput
For a supply voltage at 5 V, if the source impedance is less than 1 k
, this equates to a minimum sampling
time tch(0.5 LSB) of 0.84 s. Since the sampling time requires six I/O clocks, the fastest I/O clockfrequency is
6/tch = 7.18 MHz. The minimal total cycle time is given as:
tc = taddress + tsample + tconv + td(EOC↑ – CS↓)
= 0.56
s + 0.84 s + 10 s + 0.1 s
= 11.5
s
A maximum throughput of 87 KSPS. The throughput can be even higher with a smaller source impedance.
When source impedance is 100
, the minimum sampling time is 0.46 s. The maximum I/O clock frequency
possible is almost 13 MHz. Then 10 MHz clock (maximum I/O CLK for TLV1544/1548) can be used. The minimal
total cycle time is:
tc = taddress + tsample + tconv + td(EOC↑ – CS↓)
= 4
× 1/f + 0.46 s + 10 s + 0.1 s
= 0.4
s + 0.46 s + 10 s + 0.1 s
= 10.96
s
The maximum throughput is 1/10.96
s = 91 KSPS for this case.
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| TLV1548CDBLE | 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 |
| TLV1548CDBR | 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 |
| TLV1548CDBRG4 | 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 |
| 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 |
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