Rev.1.01 XRD98L63 CDS By-Pass Mode The CDS By-Pass mode connects the CCDin and REFin pins directly to the CDS amp inputs, by-passing the CDS" />
參數(shù)資料
型號(hào)： XRD98L63ZEVAL
廠商： Exar Corporation
文件頁(yè)數(shù)： 9/41頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XRD98L63
標(biāo)準(zhǔn)包裝： 1
系列： *
17
Rev.1.01
XRD98L63
CDS By-Pass Mode
The CDS By-Pass mode connects the CCDin and
REFin pins directly to the CDS amp inputs, by-passing
the CDS switching function. This mode is useful for
testing the PGA/ADC with a simple differential or a
single-ended signal.
To enable the CDS By-Pass mode, write a “1” to the No
CDS bit in the Test register. This will disable the CDS
switching functions and turn on switches which connect
the CCDin & REFin pins directly to the CDS amp inputs.
In the CDS By-Pass mode, the SPIX signal is required
to clock the switched-capacitor PGA stages, and
ADCLK is required to clock the ADC. The PGA analog
output does not come out to any pin; the ADC digital
output must be monitored instead.
When using the CDS By-Pass mode, the calibration
logic must be put in either the Hold mode or the ManCal
mode. In the CDS By-Pass mode, the Coarse Offset
DAC does not affect the input, but the Fine Offset DAC
does affect the PGA output. The calibration logic is not
aware that the Coarse Offset DAC is not active, and will
cause errors if left operating in the automatic mode.
To simplify signal interfacing when using the CDS By-
Pass mode, write a “1” to the nofs2 bit in the Test
register. This will disable the scale offset introduced
at the PGA ouput (this offset is required for CCD signal
digitization).
When using the CDS By-Pass mode, the ADC digital
output code will be related to the inputs by the transfer
function below:
(
)
[
] (
)
CapN
CapP
2
4096
DAC
FineOffset
PGAgain
2048
ADCout
×
+
×
+
=
CCDin
REFin
Figure 8. CDS By-Pass Mode Timing
Input Signal
REFin-CCDin
SPIX
ADCLK
Sample N
PGA1 tracks
Input Signal
ADC tracks
PGA2 output
non-overlap
DB[11:0]
Sample N+1
Data N-7
Data N-6
PGA2 tracks
PGA1 output
t
DL
Data N-8
相關(guān)PDF資料
PDF描述
RCB13DHLN CONN EDGECARD 26POS DIP .050 SLD
P1330R-104K INDUCTOR POWER 100.0UH SMD
VI-270-EY CONVERTER MOD DC/DC 5V 50W
0210490388 CABLE JUMPER 1.25MM .030M 32POS
VE-20X-EY CONVERTER MOD DC/DC 5.2V 50W
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRDAN27 制造商:EXAR 制造商全稱:EXAR 功能描述:Compensating for Zero Order Hold Effects
XRDAN28 制造商:EXAR 制造商全稱:EXAR 功能描述:Frequency Response Effects of Overampling and Averaging on A/D Output Data
XRDAN29 制造商:EXAR 制造商全稱:EXAR 功能描述:Criteria for Accurate Sampling of Analog Signals
XRDAN30 制造商:EXAR 制造商全稱:EXAR 功能描述:CMOS Current Output D/A Converter Design Concepts for Wide Bandwidth Applications
XR-E 制造商:CREE 制造商全稱:Cree, Inc 功能描述:XLamp XR-E and XR-C LED Binning and Labeling
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*