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參數資料
| 型號： | THS1040IDW |
| 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： | 8/36頁 |
| 文件大小： | 751K |
| 代理商： | THS1040IDW |
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THS1040
SLAS290C OCTOBER 2001 REVISED OCTOBER 2004
16
www.ti.com
PRINCIPLES OF OPERATION
ADC reference generation
The THS1040 ADC references REFT and REFB can be driven from external (off-chip) sources or from the
internal (on-chip) reference buffer A2. The voltage at the MODE pin determines the ADC references source.
Connecting MODE to AGND enables external ADC references mode. In this mode the internal buffer A2 is
powered down and the user must provide the REFT and REFB voltages by connecting external sources directly
to these pins. This mode is useful where several THS1040 devices must share common references for best
matching of their ADC input ranges, or when the application requires better accuracy and temperature stability
than the on-chip reference source can provide.
Connecting MODE to AVDD or AVDD/2 enables internal ADC references mode. In this mode the buffer A2 is
powered up and drives the REFT and REFB pins. External reference sources should not be connected in this
mode. Using internal ADC references mode when possible helps to reduce the component count and hence
the system cost.
When MODE is connected to AVDD, a buffered AVDD/2 voltage is available at the BIASREF pin. This voltage
can be used as a dc bias level for any ac-coupling networks connecting the input signal sources to the AIN+
and AIN pins.
MODE PIN
REFERENCE SELECTION
BIASREF PIN FUNCTION
AGND
External
High impedance
AVDD/2
Internal
High impedance
AVDD
Internal
AVDD/2 for AIN± bias
external reference mode (MODE = AGND)
Sample
and
Hold
X1
ADC
Core
AIN+
AIN
Internal
Reference
Buffer
VREF
REFT
REFB
Figure 21. ADC Reference Generation, MODE = AGND
Connecting pin MODE to AGND powers down the internal references buffer A2 and disconnects its outputs from
the REFT and REFB pins. The user must connect REFT and REFB to external sources to provide the ADC
reference voltages required to match the THS1040 input range to their application requirements. The
common-mode reference voltage must be AVDD/2 for correct THS1040 operation:
(REFT
) REFB)
2
+
AV
DD
2
(6)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS1040IDWG4 | 功能描述:模數轉換器 - ADC 10 Bit 40 MSPS Low Power 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 |
| THS1040IDWR | 功能描述:模數轉換器 - ADC 10 Bit 40 MSPS Low Power 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 |
| THS1040IDWRG4 | 功能描述:模數轉換器 - ADC 10 Bit 40 MSPS Low Power 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 |
| THS1040IPW | 功能描述:模數轉換器 - ADC 10 Bit 40 MSPS Low Power 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 |
| THS1040IPWG4 | 功能描述:模數轉換器 - ADC 10 Bit 40 MSPS Low Power 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 |
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