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參數(shù)資料
| 型號： | DC956A |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 13/40頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2485 |
| 軟件下載： | QuikEval System |
| 設(shè)計資源： | DC956A Design File DC956A Schematic |
| 標準包裝： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 24 |
| 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： | LTC2485 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)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
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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