參數(shù)資料
型號： LTC2440CGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 24-Bit High Speed Differential delta-sigma ADC with Selectable Speed/Resolution
中文描述： 1-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁數(shù)： 22/28頁
文件大?。?/td> 316K
代理商： LTC2440CGN
LTC2440
22
sn2440, 2440fas
SLEEP
CONVERT
SLEEP
CONVERT
SLEEP
8
μ
A
2440 F15
8mA
8
μ
A
8mA
8
μ
A
DATA
OUT
DATA
OUT
CONVERTER
STATE
SUPPLY
CURRENT
CS
Figure 15. Reduced Power Timing Mode
APPLICATIU
W
U
U
LTC2440 Input Structure
Modern delta sigma converters have switched capacitor
front ends that repeatedly sample the input voltage over
some time period. The sampling process produces a small
current pulse at the input and reference terminals as the
capacitors are charged. The LTC2440 switches the input
and reference to a 5pF sample capacitor at a frequency
of 1.8MHz. A simplified equivalent circuit is shown in
Figure 16.
The average input and reference currents can be ex-
pressed in terms of the equivalent input resistance of the
sample capacitor, where:
Req = 1/(f
SW
Ceq)
When using the internal oscillator, f
SW
is 1.8MHz and the
equivalent resistance is approximately 110k
.
Driving the Input and Reference
Because of the small current pulses, excessive lead length
at the analog or reference input may allow reflections or
ringing to occur, affecting the conversion accuracy. The
key to preserving the accuracy of the LTC2440 is complete
settling of these sampling glitches at both the input and
reference terminals. There are several recommended
methods of doing this.
V
REF
+
V
IN
+
V
CC
R
SW
(TYP)
500
I
LEAK
I
LEAK
V
CC
V
CC
I
LEAK
I
LEAK
R
SW
(TYP)
500
C
EQ
5pF
(TYP)
(C
EQ
= 3.5pF SAMPLE CAP + PARASITICS)
R
SW
(TYP)
500
I
LEAK
I
IN
+
V
IN
–
I
IN
–
I
REF
+
I
REF
–
2440 F16
I
LEAK
V
CC
I
LEAK
I
LEAK
SWITCHING FREQUENCY
f
SW
= 1.8MHz INTERNAL OSCILLATOR
f
SW
= f
EOSC
/5 EXTERNAL OSCILLATOR
V
REF
–
R
SW
(TYP)
500
Figure 16. LTC2440 Input Structure
相關(guān)PDF資料
PDF描述
LTC2440IGN 24-Bit High Speed Differential delta-sigma ADC with Selectable Speed/Resolution
LTC2444 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
LTC2444C 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
LTC2444CUHF 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
LTC2444I 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2440CGN#PBF 功能描述:IC ADC DIFFER 24-BIT HS 16-SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6
LTC2440CGN#PBF 制造商:Linear Technology 功能描述:24BIT ADC DELTA SIG HS 16SSOP 制造商:Linear Technology 功能描述:24BIT ADC, DELTA SIG, HS, 16SSOP
LTC2440CGN#TR 功能描述:IC CONV A/D 24-BIT DIFF 16-SSOP 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 個單端，單極
LTC2440CGN#TRPBF 功能描述:IC ADC DIFFER 24-BIT HS 16-SSOP RoHS:是 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 個單端，單極
LTC2440CGNPBF 制造商:Linear Technology 功能描述:ADC,LTC2440C 24bit diff D-S SPI SSOP
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