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參數資料
| 型號： | THS1031IDW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | GREEN, PLASTIC, SOIC-28 |
| 文件頁數： | 24/41頁 |
| 文件大?。?/td> | 728K |
| 代理商： | THS1031IDW |
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THS1031
3-V TO 5.5-V, 10-BIT, 30 MSPS
CMOS ANALOG-TO-DIGITAL CONVERTER
SLAS242E – NOVEMBER 1999 – REVISED MARCH 2002
30
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
details
The above value for RAIN is derived by noting that the average AIN voltage must equal the bias voltage supplied
by the ac coupling network. The average value of VLAST in equation 13 is thus a constant voltage
VLAST = V(AIN bias) – VM
For an input voltage Vin at the AIN pin,
Qin = (VIN – VLAST) × CS
Provided that f (–3 dB) is much lower than fclk, a constant current flowing over the clock period can approximate
the input charging pulse
IIN
= Qin/tclk
= Qin
× fclk
= (Vin – VLAST) × CS × fclk
The ac input resistance RAIN is then
RAIN = dIin/dVin
= 1 / (dVin / dIin)
= 1 / (CS x fclk)
driving the VREF pin (differential mode)
Figure 35 shows the equivalent load on the VREF pin when driving the internal reference buffer via this pin
(MODE = AVDD/2 and REFSENSE = AVDD).
AVDD
AGND
AVDD + VREF/4
VREF
RIN
14 k
REFSENSE = AVDD,
Mode =
_
+
44
AVDD
2
Figure 35. Equivalent Circuit of VREF
The current flowing into IIN is given by
I
IN +
(3
VREF
* AV
DD
)
(4
R
IN
)
Note that the actual IIN may differ from this value by up to 50% due to device-to-device processing variations
and allowing for operating temperature variations.
The user should ensure that VREF is driven from a low noise, low drift source, well-decoupled to analog ground
and capable of driving IIN.
(13)
(14)
(15)
(16)
(17)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS1031IDWG4 | 功能描述:模數轉換器 - ADC 10-Bit 30 MSPS 1-Ch 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 |
| THS1031IDWR | 功能描述:模數轉換器 - ADC 10-Bit 30 MSPS 1-Ch 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 |
| THS1031IDWRG4 | 功能描述:模數轉換器 - ADC 10-Bit 30 MSPS 1-Ch 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 |
| THS1031IPW | 功能描述:模數轉換器 - ADC _ 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 |
| THS1031IPWG4 | 功能描述:模數轉換器 - ADC 10B 30 MSPS ADC Sgl Ch. Integ. Pgmable 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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