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參數資料
| 型號： | TLV1548QDBRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | ROHS COMPLIANT, PLASTIC, SSOP-20 |
| 文件頁數： | 33/34頁 |
| 文件大小： | 532K |
| 代理商： | TLV1548QDBRQ1 |
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TLV1548Q1
LOW VOLTAGE 10BIT ANALOGTODIGITAL CONVERTER
WITH SERIAL CONTROL AND 8 ANALOG INPUTS
SGLS172B JUNE 2003 REVISED APRIL 2008
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
converter
The CMOS threshold detector in the successive-approximation conversion system determines the value of
each bit by examining the charge on a series of binary-weighted capacitors (see Figure 1). In the first phase
of the conversion process, the analog input is sampled by closing the SC switch and all ST switches
simultaneously. This action charges all of the capacitors to the input voltage.
In the next phase of the conversion process, all ST and SC switches are opened and the threshold detector
begins identifying bits by identifying the charge (voltage) on each capacitor relative to the reference (REF )
voltage. In the switching sequence, ten capacitors are examined separately until all ten bits are identified and
then the charge-convert sequence is repeated. In the first step of the conversion phase, the threshold detector
looks at the first capacitor (weight = 512). Node 512 of this capacitor is switched to the REF+ voltage, and the
equivalent nodes of all the other capacitors on the ladder are switched to REF . If the voltage at the summing
node is greater than the trip point of the threshold detector (approximately one-half VCC), a bit 0 is placed in the
output register and the 512-weight capacitor is switched to REF . If the voltage at the summing node is less
than the trip point of the threshold detector, a bit 1 is placed in the register and the 512-weight capacitor remains
connected to REF + through the remainder of the successive-approximation process. The process is repeated
for the 256-weight capacitor, the 128-weight capacitor, and so forth down the line until all bits are counted.
With each step of the successive-approximation process, the initial charge is redistributed among the
capacitors. The conversion process relies on charge redistribution to count and weigh the bits from MSB to LSB.
SC
Threshold
Detector
Node 512
REF
REF+
ST
512
VI
To Output
Latches
REF
ST
REF+
REF
ST
REF+
REF
ST
REF+
REF
ST
REF+
ST
REF+
REF
ST
REF+
REF
ST
1
2
4
8
128
256
REF
Figure 1. Simplified Model of the Successive-Approximation System
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| TLV1549 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL |
| TLV1549C | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL |
| TLV1549CD | 功能描述:模數轉換器 - ADC 3.3V 10bit A/D RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLV1549CDG4 | 功能描述:模數轉換器 - ADC 10-Bit 38 kSPS Serial Out RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLV1549CDR | 功能描述:模數轉換器 - ADC 10-Bit 38 kSPS Serial Out RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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