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参数资料
| 型号： | DC956A |
| 厂商： | Linear Technology |
| 文件页数： | 6/40页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2485 |
| 软件下载： | QuikEval System |
| 设计资源： | DC956A Design File DC956A Schematic |
| 标准包装： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 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： | LTC2485 |
| 已供物品： | 板 |
| 相关产品： | LTC2485CDD#TRPBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485IDD#TRPBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485IDD#PBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485CDD#PBF-ND - IC ADC 24BIT I2C 10-DFN |
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LTC2485
14
2485fc
APPLICATIONS INFORMATION
The LTC2485 powers up in a default mode commonly
used for most measurements. The device will remain in
this mode until a valid write cycle is performed. In this
default mode, the measured input is external, the digital
lter simultaneously rejects 50Hz and 60Hz line frequency
noise, and the speed mode is 1x (offset automatically,
continuously calibrated).
The I2C serial interface grants access to any or all special
functions contained within the LTC2485. In order to change
the mode of operation, a valid write address followed by 8
bits of data are shifted into the device (see Table 1). The
rst 4 bits are reserved and should be low. The 5th bit
(IM) is used to select the internal temperature sensor as
the conversion input, while the 6th and 7th bits (FA, FB)
combine to determine the line frequency rejection mode.
The 8th bit (SPD) is used to double the output rate by
disabling the offset auto calibration.
Table 1. Selecting Special Modes
IM
FA
FB
SPD
COMMENTS
0
External Input, 50Hz and 60Hz Rejection,
Autocalibration
00
1
0
External Input, 50Hz Rejection,
Autocalibration
01
0
External Input, 60Hz Rejection,
Autocalibration
0
1
External Input, 50Hz and 60Hz Rejection,
2x Speed
0
1
External Input, 50Hz Rejection, 2x Speed
0
1
0
1
External Input, 60Hz Rejection, 2x Speed
1
0
Temperature Input, 50Hz and 60Hz
Rejection, Autocalibration
1
0
1
X
Temperature Input, 50Hz Rejection,
Autocalibration
1
0
X
Temperature Input, 60Hz Rejection,
Autocalibration
X
1
X
Reserved, Do Not Use
Temperature Sensor (IM)
The LTC2485 includes an on-chip temperature sensor.
The temperature sensor is selected by setting IM = 1 in
the serial input data stream. Conversions are performed
directly on the temperature sensor by the converter. While
operating in this mode, the device behaves as a temperature
to bits converter. The digital reading is proportional to the
absolute temperature of the device. This feature allows
the converter to linearize temperature sensors or continu-
ously remove temperature effects from external sensors.
Several applications leveraging this feature are presented
in more detail in the applications section. While operating
in this mode, the speed is set to normal independent of
the control bit (SPD).
Rejection Mode (FA, FB)
The LTC2485 includes a high accuracy on-chip oscilla-
tor with no required external components. Coupled with
a 4th order digital lowpass lter, the LTC2485 rejects
line frequency noise. In the default mode, the LTC2485
simultaneously rejects 50Hz and 60Hz by at least 87dB.
The LTC2485 can also be congured to selectively reject
50Hz or 60Hz to better than 110dB.
Speed Mode (SPD)
The LTC2485 continuously performs offset calibrations.
Every conversion cycle, two conversions are automatically
performed (default) and the results combined. This result
is free from offset and drift. In applications where the offset
is not critical, the autocalibration feature can be disabled
with the benet of twice the output rate.
Linearity, full-scale accuracy and full-scale drift are identi-
cal for both 2x and 1x speed modes. In both the 1x and
2x speed there is no latency. This enables input steps or
multiplexer channel changes to settle in a single conver-
sion cycle easing system overhead and increasing the
effective conversion rate.
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| 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 |
| DC95F103WN | 制造商:GE Sensing & Inspection Technologies 功能描述:Thermistor 10 PCB Mount Mtg Type 1.5Lead Bare Tinned Copper 0 +70 制造商:GE Sensing & Inspection Technologies / Thermometrics 功能描述:THERMISTOR NTC +60 10KOHM 制造商:GE Measurement & Control 功能描述:+/-.2oC (0oC - 70oC) Interchangeable Chip 制造商:GE MEASUREMENT & CONTROL/GE SENSING 功能描述:THERMISTOR, NTC, +60C, 10KOHM; Thermistor Type:NTC; Resistance:10kohm; Thermistor Case Style:Radial Leaded; No. of Pins:2; Operating Temperature Min:-40C; Operating Temperature Max:60C; Operating Temperature Range:-40C to +60C ;RoHS Compliant: Yes |
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