參數(shù)資料
型號: LTC2428CG
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: 4-/8-Channel 20-Bit uPower No Latency ADCs
中文描述: 8-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝: 0.209 INCH, PLASTIC, SSOP-28
文件頁數(shù): 22/28頁
文件大?。?/td> 317K
代理商: LTC2428CG
22
LTC2424/LTC2428
APPLICATIO
S I
FOR
ATIO
U
W
U
U
full-scale shift, see Figure 19. To simplify the analysis of
input dynamic current, two separate cases are assumed:
large capacitance at V
IN
(C
IN
> 0.01
μ
F) and small capaci-
tance at V
IN
(C
IN
< 0.01
μ
F).
If the total capacitance at V
IN
(see Figure 20) is small
(<0.01
μ
F), relatively large external source resistances (up
to 20k for 20pF parasitic capacitance) can be tolerated
without any offset/full-scale error.
ANTIALIASING
One of the advantages delta-sigma ADCs offer over con-
ventional ADCs is on-chip digital filtering. Combined with
a large oversampling ratio, the LTC2424/LTC2428 signifi-
cantly simplify antialiasing filter requirements.
The digital filter provides very high rejection except at
integer multiples of the modulator sampling frequency
(f
S
), see Figure 21. The modulator sampling frequency is
256 F
O
, where F
O
is the notch frequency (typically 50Hz
or 60Hz). The bandwidth of signals not rejected by the
digital filter is narrow (
0.2%) compared to the bandwidth
of the frequencies rejected.
Figure 18. LTC2424/LTC2428 Equivalent Analog Input Circuit
FS
SET
CHX
ADCV
CC
(PIN 2)
R
SW
5k
AVERAGE INPUT CURRENT:
I
DC
= 0.25(V
IN
– 0.5 V
REF
) f C
EQ
I
REF
I
REF
ADCV
CC
(PIN 2)
I
IN(LEAK)
I
IN(LEAK)
±
I
DC
MUXV
CC
(PIN 8)
I
IN(MUX)
I
IN(MUX)
R
SW
5k
R
SW
75
C
1pF (TYP)
R
SW
5k
SELECTED
CHANNEL
24248 F18
f
OUT
= 50Hz, INTERNAL OSCILLATOR: f = 128kHz
f
= 60Hz, INTERNAL OSCILLATOR: f = 153.6kHz
EXTERNAL OSCILLATOR: 2.56kHz
f
307.2kHz
ZS
SET
ADCIN
MUXOUT
Figure 19. Offset/Full-Scale Shift
Figure 20. An RC Network at CH0 to CH7
0
TUE
V
REF
/2
V
IN
24248 F19
V
REF
C
IN
24248 F20
INTPUT
SIGNAL
SOURCE
R
SOURCE
CH0 TO
CH7
LTC2424/
LTC2428
C
PAR
Figure 21. Sync
4
Filter Rejection
INPUT FREQUENCY
0
–60
–40
0
24248 F21
–80
–100
f
S
/2
f
S
–120
–140
–20
R
相關(guān)PDF資料
PDF描述
LTC2428I 4-/8-Channel 20-Bit uPower No Latency ADCs
LTC2428IG 4-/8-Channel 20-Bit uPower No Latency ADCs
LTC2442 24-Bit High Speed 4-Channel Delta-Sigma ADC with Integrated Amplifi er
LTC2442CG 24-Bit High Speed 4-Channel Delta-Sigma ADC with Integrated Amplifi er
LTC2442IG 24-Bit High Speed 4-Channel Delta-Sigma ADC with Integrated Amplifi er
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2428CG#PBF 功能描述:IC ADC 20BIT 8CH MICROPWR 28SSOP 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(zhǔn)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
LTC2428CG#TR 功能描述:IC ADC 20BIT 8CH MICROPWR 28SSOP 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 個單端,單極
LTC2428CG#TRPBF 功能描述:IC ADC 20BIT 8CH MICROPWR 28SSOP 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(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 個單端,單極
LTC2428CGPBF 制造商:Linear Technology 功能描述:ADC,LTC2428C 20bit D-S 8 ch SPI SSOP
LTC2428IG 功能描述:IC ADC 20BIT 8CH MICROPWR 28SSOP 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 個單端,單極