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參數(shù)資料
| 型號(hào)： | DC955A |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 9/34頁(yè) |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2483 |
| 軟件下載： | QuikEval System |
| 設(shè)計(jì)資源： | DC955A Design File DC955A Schematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 6.8 |
| 數(shù)據(jù)接口： | I²C，串行 |
| 工作溫度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2483 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | LTC2483IDD#TRPBF-ND - IC ADC 16BIT I2C 10-DFN LTC2483CDD#TRPBF-ND - IC ADC 16BIT I2C 10-DFN LTC2483IDD#PBF-ND - IC ADC 16BIT I2C 10-DFN LTC2483CDD#PBF-ND - IC ADC 16BIT I2C 10-DFN |
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LTC2483
2483fc
the thermal noise of the front-end circuits, and as such,
its value in nanovolts is nearly constant with reference
voltage. Since the transition noise (600nV) is much less
than the quantization noise (VREF/217), a decrease in the
reference voltage will increase the converter resolution. A
reduced reference voltage will also improve the converter
performance when operated with an external conversion
clock (external FO signal) at substantially higher output
data rates (see the Output Data Rate section).
Thereferenceinputisdifferential.Thedifferentialreference
input range (VREF = REF+ – REF–) is 100mV to VCC and the
common mode reference input range is 0V to VCC.
Input Voltage Range
The analog input is truly differential with an absolute/
common mode range for the IN+ and IN– input pins
extending from GND – 0.3V to VCC + 0.3V. Outside
these limits, the ESD protection devices begin to turn on
andtheerrorsduetoinputleakagecurrentincreaserapidly.
Withintheselimits,theLTC2483convertsthebipolardiffer-
ential input signal, VIN = IN+ – IN–, from –FS to +FS where
FS = 0.5 VREF. Beyond this range, the converter indicates
the overrange or the underrange condition using distinct
output codes. Since the differential input current cancella-
tion does not rely on an on-chip buffer, current cancellation
and DC performance is maintained rail-to-rail.
applicaTions inFormaTion
Input signals applied to IN+ and IN– pins may extend by
300mV below ground and above VCC. In order to limit any
fault current, resistors of up to 5k may be added in series
withtheIN+andIN–pinswithoutaffectingtheperformance
of the devices. The effect of the series resistance on the
converter accuracy can be evaluated from the curves
presentedintheInputCurrent/ReferenceCurrentsections.
In addition, series resistors will introduce a temperature
dependent offset error due to the input leakage current.
A 1nA input leakage current will develop a 1ppm offset
error on a 5k resistor if VREF = 5V. This error has a very
strong temperature dependency.
Driving the Input and Reference
The input and reference pins of the LTC2483 converter
are directly connected to a network of sampling capaci-
tors. Depending upon the relation between the differential
input voltage and the differential reference voltage, these
capacitors are switching between these four pins transfer-
ring small amounts of charge in the process. A simplified
equivalent circuit is shown in Figure 7.
For a simple approximation, the source impedance RS
driving an analog input pin (IN+, IN–, REF+ or REF–) can
be considered to form, together with RSW and CEQ (see
Figure 7),afirstorderpassivenetworkwithatimeconstant
τ = (RS + RSW) CEQ. The converter is able to sample the
VREF+
VIN+
VCC
RSW (TYP)
10k
ILEAK
VCC
ILEAK
VCC
RSW (TYP)
10k
CEQ
12pF
(TYP)
RSW (TYP)
10k
ILEAK
IIN+
VIN–
IIN–
IREF+
IREF–
2483 F07
ILEAK
VCC
ILEAK
SWITCHING FREQUENCY
fSW = 123kHz INTERNAL OSCILLATOR
fSW = 0.4 fEOSC EXTERNAL OSCILLATOR
VREF–
RSW (TYP)
10k
Figure 7. LTC2483 Equivalent Analog Input Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
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| DC956A | 功能描述:BOARD DELTA SIGMA ADC LTC2485 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:Easy Drive™, QuikEval™ 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| DC959A | 制造商:Linear Technology 功能描述:BOARD DEMO LTC4257-1 制造商:Linear Technology 功能描述:EVAL BOARD, LTC4257CDD-1 POE |
| DC95F103V | 功能描述:熱敏電阻 - NTC 10KOhms +-.1C Epoxy Coated RoHS:否 制造商:EPCOS 電阻:10 kOhms 功率額定值:150 mW 容差:2 % 端接類型:Radial 系列:B57703M 工作溫度范圍:- 55 C to + 125 C |
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| DC95F103W | 功能描述:熱敏電阻 - NTC 10KOhms +-.2C Epoxy Coated RoHS:否 制造商:EPCOS 電阻:10 kOhms 功率額定值:150 mW 容差:2 % 端接類型:Radial 系列:B57703M 工作溫度范圍:- 55 C to + 125 C |
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