difference between V
參數(shù)資料
型號(hào)： LTC2481IDD#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 17/40頁(yè)
文件大小： 0K
描述： IC ADC 16BIT I2C 10-DFN
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 16
采樣率（每秒）： 7.5
數(shù)據(jù)接口： I²C，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 480µW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 10-WFDFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 10-DFN（3x3）
包裝： 帶卷 (TR)
輸入數(shù)目和類(lèi)型： 2 個(gè)單端，雙極；1 個(gè)差分，雙極
配用： DC951A-ND - BOARD DELTA SIGMA ADC LTC2481
LTC2481
24
2481fc
APPLICATIONS INFORMATION
the common mode input current is proportional to the
difference between VINCM and VREFCM. For a reference
common mode of 2.5V and an input common mode of
1.5V, the common mode input current is approximately
0.74μA (in simultaneous 50Hz/60Hz rejection mode). This
common mode input current has no effect on the accuracy
if the external source impedances tied to IN+ and IN– are
matched. Mismatches in these source impedances lead
to a xed offset error but do not affect the linearity or full-
scale reading. A 1% mismatch in 1kΩ source resistances
leads to a 15ppm shift (74μV) in offset voltage.
In applications where the common mode input voltage
varies as a function of input signal level (single-ended
input, RTDs, half bridges, current sensors, etc.), the com-
mon mode input current varies proportionally with input
voltage. For the case of balanced input impedances, the
common mode input current effects are rejected by the
large CMRR of the LTC2481 leading to little degradation in
accuracy. Mismatches in source impedances lead to gain
errors proportional to the difference between the common
mode input voltage and the common mode reference
voltage. 1% mismatches in 1kΩ source resistances lead
to worst-case gain errors on the order of 15ppm or 1LSB
(for 1V differences in reference and input common mode
voltage). Table 7 summarizes the effects of mismatched
source impedance and differences in reference/input
common mode voltages.
Table 7. Suggested Input Conguration for LTC2481
BALANCED INPUT
RESISTANCES
UNBALANCED INPUT
RESISTANCES
Constant
VIN(CM) – VREF(CM)
CEXT > 1nF at Both IN+
and IN–. Can Take Large
Source Resistance with
Negligible Error
CEXT > 1nF at Both IN+
and IN–. Can Take Large
Source Resistance.
Unbalanced Resistance
Results in an Offset Which
Can be Calibrated
Varying
VIN(CM) – VREF(CM)
CEXT > 1nF at Both IN+
and IN–. Can Take Large
Source Resistance with
Negligible Error
Minimize IN+ and
IN– Capacitors and Avoid
Large Source Impedance
(< 5k Recommended)
The magnitude of the dynamic input current depends upon
the size of the very stable internal sampling capacitors and
upon the accuracy of the converter sampling clock. The
accuracy of the internal clock over the entire temperature
and power supply range is typically better than 0.5%. Such
a specication can also be easily achieved by an external
clock. When relatively stable resistors (50ppm/°C) are
used for the external source impedance seen by IN+ and
IN–, the expected drift of the dynamic current and offset
will be insignicant (about 1% of their respective values
over the entire temperature and voltage range). Even for
the most stringent applications, a one-time calibration
operation may be sufcient.
In addition to the input sampling charge, the input ESD
protection diodes have a temperature dependent leakage
current. This current, nominally 1nA (±10nA max), results
in a small offset shift. A 1k source resistance will create a
1μV typical and 10μV maximum offset voltage.
Reference Current
In a similar fashion, the LTC2481 samples the differential
reference pins REF+ and REF– transferring small amount
of charge to and from the external driving circuits thus
producing a dynamic reference current. This current does
not change the converter offset, but it may degrade the
gain and INL performance. The effect of this current can
be analyzed in two distinct situations.
For relatively small values of the external reference capaci-
tors (CREF < 1nF), the voltage on the sampling capacitor
settles almost completely and relatively large values for
the source impedance result in only small errors. Such
values for CREF will deteriorate the converter offset and
gain performance without signicant benets of reference
ltering and the user is advised to avoid them.
Larger values of reference capacitors (CREF > 1nF) may be
required as reference lters in certain congurations. Such
capacitors will average the reference sampling charge and
the external source resistance will see a quasi constant
reference differential impedance.
In the following discussion, it is assumed the input and
reference common mode are the same. Using internal
oscillator for 60Hz mode, the typical differential reference
resistanceis1MΩwhichgeneratesafull-scale(VREF/2)gain
error of 0.51ppm for each ohm of source resistance driving
the REF+ and REF– pins. For 50Hz/60Hz mode, the related
difference resistance is 1.1MΩ and the resulting full-scale
error is 0.46ppm for each ohm of source resistance driving
相關(guān)PDF資料
PDF描述
MAX98300ETA+T IC AMP MONO CLASS D 2A 8TDFN
D38999/20JB98SALC CONN HSG RCPT 6POS WALL MT SCKT
MAX9700CETB+T IC AMP AUDIO 1.6W MONO D 10TDFN
D38999/20WH21SNLC CONN HSG RCPT 21POS WALL MT SCKT
VE-JTR-MX CONVERTER MOD DC/DC 7.5V 75W
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2482CDD 制造商:Linear Technology 功能描述:ADC Single Delta-Sigma 6.8sps 16-bit Serial 10-Pin DFN EP
LTC2482CDD#PBF 功能描述:IC ADC 16BIT 10-DFN RoHS:是 類(lèi)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(lèi)型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤(pán)（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類(lèi)型:8 個(gè)單端，單極 產(chǎn)品目錄頁(yè)面:892 (CN2011-ZH PDF) 其它名稱(chēng):296-25851-6
LTC2482CDD#TR 制造商:Linear Technology 功能描述:ADC Single Delta-Sigma 6.8sps 16-bit Serial 10-Pin DFN EP T/R
LTC2482CDD#TRPBF 功能描述:IC ADC 16BIT 10-DFN RoHS:是 類(lèi)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:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:16 個(gè)單端，雙極；8 個(gè)差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494
LTC2482IDD 制造商:Linear Technology 功能描述:ADC Single Delta-Sigma 6.8sps 16-bit Serial 10-Pin DFN EP
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

*
*
*