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参数资料
| 型号： | DC955A |
| 厂商： | Linear Technology |
| 文件页数： | 14/34页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2483 |
| 软件下载： | QuikEval System |
| 设计资源： | DC955A Design File DC955A Schematic |
| 标准包装： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 6.8 |
| 数据接口： | I²C，串行 |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2483 |
| 已供物品： | 板 |
| 相关产品： | 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
In addition to this gain error, the converter INL per-
formance is degraded by the reference source imped-
ance. The INL is caused by the input dependent terms
–VIN2/(VREF REQ) – (0.5 VREF DT)/REQ in the reference
pin current as expressed in Figure 7. When using internal
oscillator, every 100Ω of reference source resistance
translates into about 0.61ppm additional INL error. When
CA0/F0 is driven by an external oscillator with a frequency
fEOSC, every 100Ω of source resistance driving REF+ or
REF– translates into about 2.18 10–6 fEOSCppm ad-
ditional INL error. Figure 15 shows the typical INL error
due to the source resistance driving the REF+ or REF– pins
when large CREF values are used. The user is advised to
minimize the source impedance driving the REF+ and
REF– pins.
In applications where the reference and input common
mode voltages are different, extra errors are introduced.
For every 1V of the reference and input common mode
voltage difference (VREFCM – VINCM) and a 5V reference,
each ohm of reference source resistance introduces an
extra (VREFCM – VINCM)/(VREF REQ) full-scale gain error,
which is 0.067ppm when using internal oscillator. If an
applicaTions inFormaTion
external clock is used, the corresponding extra gain error
is 0.24 10–6 fEOSCppm.
The magnitude of the dynamic reference current depends
uponthesizeoftheverystableinternalsamplingcapacitors
andupontheaccuracyoftheconvertersamplingclock.The
accuracy of the internal clock over the entire temperature
andpowersupplyrangeistypicallybetterthan0.5%.Such
a specification can also be easily achieved by an external
clock. When relatively stable resistors (50ppm/°C) are
used for the external source impedance seen by REF+
and REF–, the expected drift of the dynamic current gain
error will be insignificant (about 1% of its value over the
entire temperature and voltage range). Even for the most
stringent applications a one-time calibration operation
may be sufficient.
In addition to the reference sampling charge, the refer-
ence pins ESD protection diodes have a temperature de-
pendent leakage current. This leakage current, nominally
1nA (±10nA max), results in a small gain error. A 100Ω
source resistance will create a 0.05V typical and 0.5V
maximum full-scale error.
Figure 15. INL vs Differential Input Voltage and
Reference Source Resistance for CREF > 1F
VIN/VREF (V)
–0.5
INL
(ppm
OF
V
REF
)
2
6
10
0.3
2483 F15
–2
–6
0
4
8
–4
–8
–10
–0.3
–0.1
0.1
0.5
VCC = 5V
VREF = 5V
VIN(CM) = 2.5V
TA = 25°C
CREF = 10F
R = 1k
R = 100
R = 500
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DC956A | 功能描述:BOARD DELTA SIGMA ADC LTC2485 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:Easy Drive™, QuikEval™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| 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:热敏电阻 - NTC 10KOhms +-.1C Epoxy Coated RoHS:否 制造商:EPCOS 电阻:10 kOhms 功率额定值:150 mW 容差:2 % 端接类型:Radial 系列:B57703M 工作温度范围:- 55 C to + 125 C |
| DC95F103VN | 制造商:GE Sensing & Inspection Technologies 功能描述:Thermistor;10;PCB Mount Mtg. Type;1.5In Lead;Bare Tinned Copper 制造商:GE Measurement & Control 功能描述:+/-.1oC (0oC - 70oC) Interchangeable Chip |
| DC95F103W | 功能描述:热敏电阻 - NTC 10KOhms +-.2C Epoxy Coated RoHS:否 制造商:EPCOS 电阻:10 kOhms 功率额定值:150 mW 容差:2 % 端接类型:Radial 系列:B57703M 工作温度范围:- 55 C to + 125 C |
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