- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361246 > QADCRM Queued Analog-to-Digital Converter Reference Manual PDF資料下載
參數(shù)資料
| 型號： | QADCRM |
| 英文描述： | Queued Analog-to-Digital Converter Reference Manual |
| 中文描述： | 排隊模擬到數(shù)字轉(zhuǎn)換器參考手冊 |
| 文件頁數(shù)： | 76/122頁 |
| 文件大小： | 940K |
| 代理商： | QADCRM |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁當(dāng)前第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁
MOTOROLA
7-30
DIGITAL CONTROL
QADC
REFERENCE MANUAL
BYP — Sample Amplifier Bypass
Setting the BYP field in the CCW enables the amplifier bypass mode for a conversion,
and subsequently changes the timing. The initial sample time and the transfer time are
eliminated, reducing the potential conversion time by six QCLKs. However, due to in-
ternal RC effects, a minimum final sample time of four QCLKs must be allowed. This
results in a shortened conversion time of four QCLKS. When using this mode, the ex-
ternal circuit should be of low source impedance. Loading effects of the external cir-
cuitry need to be considered, since the benefits of the sample amplifier are not
present.
0 = Amplifier bypass mode disabled.
1 = Amplifier bypass mode enabled.
IST[7:6] — Input Sample Time
The IST field allows software to specify the length of the sample window. Provision is
made to vary the input sample time, through software control, to offer flexibility in the
source impedance of the circuitry providing the QADC analog channel inputs. Longer
sample times permit more accurate A/D conversions of signals with higher source im-
pedances.
Table 7-7
shows the four selectable input sample times.
Table 7-7 Input Sample Times
The programmable sample time can also be used to increase the time interval be-
tween conversions to adjust the queue execution time or the sampling rate.
In addition to the four sample times listed in
Table 7-7
, the sample amplifier may be
bypassed entirely. This results in a shorter conversion time (by four QCLKs) may also
reduce the effects of the sample amplifier on the system performance. The sample
amplifier can be bypassed on each conversion by setting the BYP bit field in the CCW.
This mode is mainly intended for factory testing, but may also be used in applications
with some considerations.
The bypass option shortens the conversion time by six QCLKs. However, due to inter-
nal RC effects, a minimum final sample time of four QCLKS must be used. This results
in a conversion time savings of four QCLKS. The slightly shorter sample time may be
of use in some applications, depending on system constraints, but may be offset by
the loss of the sample amplifier benefits. This means that external circuit loading from
the QADC may increase due to the direct connection of the internal RC DAC array dur-
ing the sample phase. Typically, the bypass mode may only be used if external source
impedance is kept low. Refer to
APPENDIX A ELECTRICAL CHARACTERISTICS
for information on the maximum allowable input source impedance.
IST[7:6]
00
01
10
11
Input Sample Times
Input sample time = QCLK period x 2
Input sample time = QCLK period x 4
Input sample time = QCLK period x 8
Input sample time = QCLK period x 16
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| QAK2E104JCP | PLASTIC FILM CAPACITORS |
| QAK2E104JTP | PLASTIC FILM CAPACITORS |
| QAK2E104KCP | PLASTIC FILM CAPACITORS |
| QAK2E104KTP | PLASTIC FILM CAPACITORS |
| QAK2E105JCP | PLASTIC FILM CAPACITORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| QAE100 | 制造商:P-DUKE 制造商全稱:Power Mate Technology Co., LTD 功能描述:QUARTER-BRICK DC-DC CONVERTER 2:1 ULTRA WIDE INPUT RANGE UP TO 108Watts |
| QAE100W | 制造商:P-DUKE 制造商全稱:Power Mate Technology Co., LTD 功能描述:QUARTER-BRICK DC-DC CONVERTER 4:1 ULTRA WIDE INPUT RANGE UP TO 90Watts |
| QAE150 | 制造商:P-DUKE 制造商全稱:Power Mate Technology Co., LTD 功能描述:QUARTER-BRICK DC-DC CONVERTER 2:1 ULTRA WIDE INPUT RANGE UP TO 150Watts |
| QAE150W | 制造商:P-DUKE 制造商全稱:Power Mate Technology Co., LTD 功能描述:QUARTER-BRICK DC-DC CONVERTER 4:1 ULTRA WIDE INPUT RANGE UP TO 132Watts |
| QAEP | 制造商:Omnimount 功能描述:10.6 ~ 21 Inch Adjustable 1.5 Inch NPT Pipe Extension |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。