参数资料
| 型号： | LTC2485CDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/40页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT I2C 10-DFN |
| 标准包装： | 2,500 |
| 位数： | 24 |
| 采样率（每秒）： | 6.8 |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 480µW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
| 配用： | DC956A-ND - BOARD DELTA SIGMA ADC LTC2485 |
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LTC2485
20
2485fc
APPLICATIONS INFORMATION
Ease of Use
The LTC2485 data output has no latency, lter settling
delay or redundant data associated with the conversion
cycle. There is a one-to-one correspondence between the
conversion and the output data. Therefore, multiplexing
multiple analog voltages is easy.
The LTC2485 performs offset and full-scale calibrations
every conversion cycle. This calibration is transparent to
the user and has no effect on the cyclic operation described
above. The advantage of continuous calibration is extreme
stability of offset and full-scale readings with respect to
time, supply voltage change and temperature drift.
Power-Up Sequence
The LTC2485 automatically enters an internal reset state
when the power supply voltage VCC drops below ap-
proximately 2V. This feature guarantees the integrity of the
conversion result.
When the VCC voltage rises above this critical threshold,
the converter creates an internal power-on-reset (POR)
signal with a duration of approximately 4ms. The POR
signal clears all internal registers. Following the POR signal,
the LTC2485 starts a normal conversion cycle and follows
the succession of states described in Figure 1. The rst
conversion result following POR is accurate within the
specications of the device if the power supply voltage is
restored within the operating range (2.7V to 5.5V) before
the end of the POR time interval.
On-Chip Temperature Sensor
The LTC2485 contains an on-chip PTAT (proportional to
absolute temperature) signal that can be used as a tempera-
ture sensor. The internal PTAT has a typical value of 420mV
at 27°C and is proportional to the absolute temperature
value with a temperature coefcient of 420/(27 + 273) =
1.40mV/°C (SLOPE), as shown in Figure 11. The internal
PTAT signal is used in a single-ended mode referenced to
device ground internally. The 1x speed mode with automatic
offset calibration is automatically selected for the internal
PTAT signal measurement as well.
When using the internal temperature sensor, if the output
code is normalized to RSDA = VPTAT/VREF, the temperature
is calculated using the following formula:
TK =
RSDA VREF
SLOPE
in Kelvin
and
TC =
RSDA VREF
SLOPE
– 273 in ° C
where SLOPE is nominally 1.4mV/°C.
Since the PTAT signal can have an initial value variation
which results in errors in SLOPE, to achieve absolute tem-
perature measurements, a one-time calibration is needed
to adjust the SLOPE value. The converter output of the
PTAT signal, R0SDA, is measured at a known temperature
T0 (in °C) and the SLOPE is calculated as:
SLOPE =
R0SDA VREF
T0 + 273
This calibrated SLOPE can be used to calculate the tem-
perature.
If the same VREF source is used during calibration and
temperature measurement, the actual value of the VREF
is not needed to measure the temperature as shown in
the calculation below:
TC =
RSDA VREF
SLOPE
– 273
=
RSDA
R0SDA
T0 + 273
(
) – 273
TEMPERATURE (°C)
–60
V
PTAT
(μV)
500
600
120
2485 F11
400
200
30
090
–30
60
300
VCC = 5V
IM = 1
SLOPE = 1.40mV/°C
Figure 11. Internal PTAT Signal vs Temperature
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| LTC2485IDD | 制造商:Linear Technology 功能描述:ADC Single Delta-Sigma 7.5sps 24-bit Serial 10-Pin DFN EP |
| LTC2485IDD#PBF | 功能描述:IC ADC 24BIT I2C 10-DFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| LTC2485IDD#TRPBF | 功能描述:IC ADC 24BIT I2C 10-DFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
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