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參數(shù)資料

型號：	THS0842IPFB
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(shù)：	11/30頁
文件大小：	503K
代理商：	THS0842IPFB

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

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

analog input (continued)

To maintain the frequency performance outlined in the specifications, the total source impedance should be

limited to the following equation with fCLK = 80 MHz, CI = 5 pF, RSW = 200 :

S t

÷ 2f

CLK

In(256) –R

So, for applications running at a lower fCLK, the total source resistance can increase proportionally.

The analog input of the THS0842 is a differential input that can be configured in various ways depending on

the signal source and the required level of performance. A fully differential connection (Figure 20) will deliver

the best performance from the converter. A dc voltage source, CML, equal to 1.5 V (typical for AVDD = 3 V), is

made available to the user to help simplify circuit design when using an ac coupled differential input. This low

output impedance voltage source(300

, typical) is not designed to be a reference or to be loaded, but makes

an excellent dc bias source and stays well within the analog input common mode voltage range over

temperature. If load on that pin is foreseen, the use of an external buffer is recommended. Defining VREFD =

VREFT – VREFB, each single-ended analog input is limited to be between VCML + VREFD/2 and VCML –

VREFD/2. See Table 1 for the minimum and maximum reference input levels.

For the ac-coupled differential input with AVDD = 3 V (see Figure 23), full scale is achieved when the +I/Q and

–I/Q input signals are 0.5 VPP, with –I/Q being 180 degrees out of phase with +I/Q. The converter will be at

positive full scale when the +I/Q input is at CML + 0.25 V and the –I/Q input is at CML – 0.25 V (+I/Q + I/Q –

= 0.5 V). Conversely, the converter will be at negative full scale when the +I/Q input is equal to CML – 0.25 V

and –I/Q is at CML + 0.25 V (I/Q+ + I/Q– = –0.5 V) (see Figure 19).

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
THS0842IPFBG4	功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 40MSPS Dual Ch RoHS:否制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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(shù)轉(zhuǎn)換器 - ADC 10-Bit 6 MSPS Quad Ch DSP/uP Ifc RoHS:否制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32

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