(300°K), with a slope of 93.5μV/°C independent of V
參數(shù)資料
型號： DC1010A-C
廠商： Linear Technology
文件頁數(shù)： 11/32頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2487
軟件下載： QuikEval System
設計資源： DC1010A Design File
DC1010A Schematic
標準包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 15
數(shù)據(jù)接口： I²C，串行
已用 IC / 零件： LTC2487
已供物品： 板
相關產品： LTC2487IDE#TRPBF-ND - IC ADC 16BIT DELTA SIG 14-DFN
LTC2487CDE#TRPBF-ND - IC ADC 16BIT DELTA SIG 14-DFN
LTC2487CDE#PBF-ND - IC ADC 16BIT DELTA SIG 14-DFN
LTC2487IDE#PBF-ND - IC ADC 16BIT DELTA SIG 14-DFN
LTC2487
19
2487fd
The internal temperature sensor output is 28mV at 27°C
(300°K), with a slope of 93.5μV/°C independent of VREF
(see Figures 4 and 5). Slope calibration is not required if
the reference voltage (VREF) is known. A 5V reference has
If the value of VREF is not known, the slope is determined
by measuring the temperature sensor at a known tempera-
ture TN (in K) and using the following formula:
SLOPE
DATAOUT
TN
=
16
This value of slope can be used to calculate further tem-
perature readings using:
T
DATAOUT
SLOPE
K =
16
All Kelvin temperature readings can be converted to TC
(C) using the fundamental equation:
TC = TK – 273
Initiating a New Conversion
When the LTC2487 nishes a conversion, it automatically
enters the sleep state. Once in the sleep state, the device is
ready for a read operation. After the device acknowledges
a read request, the device exits the sleep state and enters
the data output state. The data output state concludes and
the LTC2487 starts a new conversion once a Stop condi-
tion is issued by the master or all 24 bits of data are read
out of the device.
During the data read cycle, a Stop command may be issued
by the master controller in order to start a new conversion
and abort the data transfer. This Stop command must be
issued during the ninth clock cycle of a byte read when
the bus is free (the ACK/NAK cycle).
LTC2487 Address
The LTC2487 has two address pins (CA0, CA1). Each may
be tied high, low, or left oating enabling one of 9 possible
addresses (see Table 6).
In addition to the congurable addresses listed in Table 6,
the LTC2487 also contains a global address (1110111)
which may be used for synchronizing multiple LTC2487s or
other LTC24XX delta-sigma I2C devices (see Synchronizing
Multiple LTC2487s with a Global Address Call section).
APPLICATIONS INFORMATION
Figure 4. Internal PTAT Digital Output vs Temperature
Figure 5. Absolute Temperature Error
TEMPERATURE (°C)
–55
–30
–5
ABSOLUTE
ERROR
(°C)
5
4
3
2
1
–4
–3
–2
–1
0
120
95
70
45
20
2487 F05
–5
TEMPERATURE (K)
0
DA
TAOUT
16
480
640
800
960
1020
400
2487 F04
320
0
300
200
100
160
VCC = 5V
VREF = 5V
SLOPE = 2.45 LSB16/K
a slope of 2.45 LSBs16/°C. The temperature is calculated
from the output code (where DATAOUT16 is the decimal
representation of the 16-bit result) for a 5V reference using
the following formula:
T
DATAOUT
in Kelvin
K =
16
245
.
If a different value of VREF is used, the temperature
output is:
T
DATAOUT
V
/12.25 in Kelvin
K
REF
=
16
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