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參數資料
| 型號： | THS0842IPFBG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 2-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | GREEN, PLASTIC, TQFP-48 |
| 文件頁數： | 15/30頁 |
| 文件大小： | 503K |
| 代理商： | THS0842IPFBG4 |
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THS0842
DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER
WITH SINGLE OR DUAL PARALLEL BUS OUTPUT
SLAS246A – DECEMBER 1999 – REVISED AUGUST 2000
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
ac coupled input (continued)
THS0842
CML
R3
AIN+
VIN+
AIN–
VIN–
REFT
REFB
R1
R2
R1
R2
C
100
pF
Vbias
Figure 21. DC-Coupled Differential Input Circuit
For many applications, ac coupling offers a convenient way for biasing the analog input signal at the proper
signal range. Figure 20 shows a typical configuration. To maintain the outlined specifications, the component
values need to be carefully selected. The most important issue is the positioning of the 3 dB high-pass corner
point f–3 dB, which is a function of R (RS + RSW as shown in Figure 18) and the parallel combination of C1 and
C2, called Ceq. This is given by the following equation:
f
–3 dB +
1
÷ 2π xR xCeq
Since C1 is typically a large electrolytic or tantalum capacitor, the impedance becomes inductive at higher
frequencies. Adding a small ceramic or polystyrene capacitor, C2 of approximately 0.01
F, which is not
inductive within the frequency range of interest, maintains low impedance.
analog input, single-ended connection
The configuration shown in Figure 23 may be used with a single-ended ac coupled input. If I/Q is a 1 Vpp
sinewave, then I/Q IN+ is a 1 Vpp sinewave riding on a positive voltage equal to CML (see Figure 22). The
converter will be at positive full scale when I/Q IN+ is at CML+0.5V (I/Q IN+ – I/Q IN– = 0.5 V) and will be at
negative full scale when I/Q IN+ is equal to CML – 0.5 V (I/Q IN+ – I/Q IN– = –0.5 V). Sufficient headroom must
be provided such that the input voltage never goes above 3.3 V or below AGND. The simplest way is to use
the dc bias source output (CML) of the THS0842.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS0842PFB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER WITH SINGLE OR DUAL PARALLEL BUS OUTPUT |
| THS10 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EURO TERMINAL BLOCKS |
| THS10064 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT 6 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
| THS10064CDA | 功能描述:模數轉換器 - ADC 10-Bit 6 MSPS Quad Ch DSP/uP Ifc 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 |
| THS10064CDAG4 | 功能描述:模數轉換器 - ADC 10-Bit 6 MSPS Quad Ch DSP/uP Ifc 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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