參數(shù)資料
型號(hào)： LTVA
廠商： Linear Technology Corporation
英文描述： 1-/2-Channel 20-Bit UPower No Latency ADCs in MSOP-10
中文描述： 1-/2-Channel 20位ADC的無(wú)延遲UPower采用MSOP - 10
文件頁(yè)數(shù)： 20/32頁(yè)
文件大?。?/td> 375K
代理商： LTVA
20
LTC2421/LTC2422
24212f
Internal Serial Clock, Autostart Conversion
This timing mode is identical to the internal serial clock,
2-wire I/O described above with one additional feature.
Instead of grounding CS, an external timing capacitor is
tied to CS.
While the conversion is in progress, the CS pin is held
HIGH by an internal weak pull-up. Once the conversion is
complete, the device enters the low power sleep state and
an internal 25nA current source begins discharging the
capacitor tied to CS, see Figure 12. The time the converter
spends in the sleep state is determined by the value of the
external timing capacitor, see Figures 13 and 14. Once the
voltage at CS falls below an internal threshold (
≈
1.4V), the
device automatically begins outputting data. The data out-
put cycle begins on the first rising edge of SCK and ends
on the
24th
rising edge. Data is shifted out the SDO pin on
each falling edge of SCK. The internally generated serial
clock is output to the SCK pin. This signal may be used to
shift the conversion result into external circuitry. After the
24th rising edge, CS is pulled HIGH and a new conversion
is immediately started. This is useful in applications re-
quiring periodic monitoring and ultralow power. Figure 15
shows the average supply current as a function of capaci-
tance on CS.
I
t should be noticed that the external capacitor discharge
current is kept very small in order to decrease the con-
verter power dissipation in the sleep state. In the autostart
mode, the analog voltage on the CS pin cannot be
observed without disturbing the converter operation
using a regular oscilloscope probe. When using this con-
figuration, it is important to minimize the external leakage
current at the CS pin by using a low leakage external ca-
pacitor and properly cleaning the PCB surface.
The internal serial clock mode is selected every time the
voltage on the CS pin crosses an internal threshold volt-
age. An internal weak pull-up at the SCK pin is active while
CS is discharging; therefore, the internal serial clock tim-
ing mode is automatically selected if SCK is floating. It is
important to ensure there are no external drivers pulling
SCK LOW while CS is discharging.
DIGITAL SIGNAL LEVELS
The LTC2421/LTC2422’s digital interface is easy to use.
Its digital inputs (F
O
, CS and SCK in External SCK mode of
operation) accept standard TTL/CMOS logic levels and the
internal hysteresis receivers can tolerate edge rates as
slow as 100
μ
s. However, some considerations are re
quired
Figure 11. Internal Serial Clock, Continuous Operation
APPLICATIOU
W
U
U
V
CC
F
O
FS
SET
ZS
SET
SCK
CH1
SDO
GND
CS
REFERENCE VOLTAGE
ZS
SET
+ 0.1V TO V
CC
ANALOG INPUT RANGE
ZS
SET
– 0.12V
TO
FS
SET
+ 0.12V
REF
(V
REF
= FS
SET
– ZS
SET
)
0V TO FS
SET
– 100mV
CH0
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
1
μ
F
1
10
9
8
7
6
2
3
4
5
2.7V TO 5.5V
LTC2422
V
CC
V
CC
10k
SDO
SCK
(INTERNAL)
CS
LSB
20
MSB
EXR
SIG
BIT 4
BIT 0
BIT 19
BIT 18
BIT 20
BIT 21
BIT 22
EOC
CH0/CH1
BIT 23
SLEEP
DATA OUTPUT
CONVERSION
CONVERSION
24212 F11
相關(guān)PDF資料
PDF描述
LTC2450 Easy-to-Use, Ultra-Tiny 16-Bit ADC
LTC2450-1 Easy-to-Use, Ultra-Tiny 16-Bit ADC
LTC2450CDC-1TRMPBF Easy-to-Use, Ultra-Tiny 16-Bit ADC
LTC2450IDC-1TRMPBF Easy-to-Use, Ultra-Tiny 16-Bit ADC
LTC2481 Easy-to-Use, Ultra-Tiny 16-Bit ADC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTVH9G-Q2S2-25-1 制造商:OSRAM 功能描述:FIREFLY LED,True Green
LTVH9G-Q2S2-35-R18 制造商:OSRAM 功能描述:
LTV-M501 制造商:Lite-On Semiconductor Corporation 功能描述:SOP-5 HIGH SPEED PHOTO TRANSISTOR OUTPUT - Tape and Reel 制造商:Lite-On Semiconductor Corporation 功能描述:OPTOCOUPLER HS PHOTO TRANS 5SOP 制造商:Lite-On Semiconductor Corporation 功能描述:High Speed Optocouplers SOP-5 High Speed Phototranistr Output
LTV-M601 制造商:Lite-On Semiconductor Corporation 功能描述:SOP-5 HIGH SPEED PHOTO TRANSISTOR OUTPUT - Tape and Reel 制造商:Lite-On Semiconductor Corporation 功能描述:OPTOCOUPLER HS PHOTO TRANS 5SOP 制造商:Lite-On Semiconductor Corporation 功能描述:High Speed Optocouplers SOP-5 High Speed Phototranistr Output
LTV-M701 制造商:Lite-On Semiconductor Corporation 功能描述:SOP-5 HIGH SPEED PHOTO TRANSISTOR OUTPUT - Tape and Reel 制造商:Lite-On Semiconductor Corporation 功能描述:OPTOCOUPLER HS PHOTO TRANS 5SOP 制造商:Lite-On Semiconductor Corporation 功能描述:High Speed Optocouplers SOP-5 High Speed Phototranistr Output
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

*
*
*