參數(shù)資料
型號(hào)： LTC2420
廠商： Linear Technology Corporation
英文描述： Micropower 20-bit ADC(微功耗，20位串行模數(shù)轉(zhuǎn)換器)
中文描述： 微功耗20位ADC（微功耗，20位串行模數(shù)轉(zhuǎn)換器）
文件頁(yè)數(shù)： 20/36頁(yè)
文件大小： 388K
代理商： LTC2420
20
LTC2420
Internal Serial Clock, 2-Wire I/O,
Continuous Conversion
This timing mode uses a 2-wire, all output (SCK and SDO)
interface. The conversion result is shifted out of the device
by an internally generated serial clock (SCK) signal, see
Figure 11. CS may be permanently tied to ground (Pin 4),
simplifying the user interface or isolation barrier.
The internal serial clock mode is selected at the end of the
power-on reset (POR) cycle. The POR cycle is concluded
approximately 0.5ms after V
CC
exceeds 2.2V. An internal
weak pull-up is active during the POR cycle; therefore, the
internal serial clock timing mode is automatically selected
if SCK is not externally driven LOW (if SCK is loaded such
that the internal pull-up cannot pull the pin HIGH, the
external SCK mode will be selected).
During the conversion, the SCK and the serial data output
pin (SDO) are HIGH (EOC = 1). Once the conversion is
complete, SCK and SDO go LOW (EOC = 0) indicating the
conversion has finished and the device has entered the
low power sleep state. The part remains in the sleep state
a minimum amount of time (1/2 the internal SCK period)
APPLICATIU
W
U
U
then immediately begins outputting data. The data output
cycle begins on the first rising edge of SCK and ends after
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. EOC
can be latched on the first rising edge of SCK and the last
bit of the conversion result can be latched on the 24th
rising edge of SCK. After the 24th rising edge, SDO goes
HIGH (EOC = 1) indicating a new conversion is in progress.
SCK remains HIGH during the conversion.
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
SDO
SCK
(INTERNAL)
CS
LSB
20
MSB
EXR
SIG
BIT 4
BIT 0
BIT 19
BIT 18
BIT 20
BIT 21
BIT 22
EOC
BIT 23
SLEEP
DATA OUTPUT
CONVERSION
CONVERSION
2420 F11
V
CC
F
O
V
REF
SCK
V
IN
SDO
GND
CS
V
REF
0.1V TO V
CC
V
IN
–0.12V
REF
TO 1.12V
REF
1
μ
F
2.7V TO 5.5V
LTC2420
= 50Hz REJECTION
= EXTERNAL OSCILLATOR
= 60Hz REJECTION
V
CC
Figure 11. Internal Serial Clock, Continuous Operation
相關(guān)PDF資料
PDF描述
LTC2435IGN 20-Bit No Latency ADCs with Differential Input and Differential Reference
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC2420CS8#PBF 制造商:Linear Technology 功能描述:A/D Converter (A-D) IC
LTC2420CS8#TR 功能描述:IC A/D CONV 20BIT MICRPWR 8-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)單端，單極
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