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參數(shù)資料
| 型號： | LTC2487CDEPBF |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 2-/4-Channel ADC with PGA, Easy Drive and I2C Interface |
| 中文描述： | 16位2-/4-Channel型ADC PGA巡回賽，輕松驅動和I2C接口 |
| 文件頁數(shù)： | 19/32頁 |
| 文件大?。?/td> | 612K |
| 代理商： | LTC2487CDEPBF |
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LTC2487
2487fa
(see Figures 4 and 5). Slope calibration is not required if
the reference voltage (V
REF
) is known. A 5V reference has
a slope of 2.45 LSBs
16
/°C. The temperature is calculated
If the value of V
REF
is not known, the slope is determined
by measuring the temperature sensor at a known tempera-
ture T
N
(in K) and using the following formula:
DATAOUT
T
N
This value of slope can be used to calculate further tem-
perature readings using:
DATAOUT
SLOPE
SLOPE
=
16
All Kelvin temperature readings can be converted to T
C
(oC) using the fundamental equation:
T
C
= T
K
– 273
T
K
=
16
Initiating a New Conversion
When the LTC2487 finishes 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
condition 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 floating enabling one of 9 possible
addresses (see Table 6).
In addition to the configurable 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 I
2
C 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
A
°
C
5
4
3
2
1
–4
–3
–2
–1
0
120
95
70
45
20
2487 F05
–5
TEMPERATURE (K)
0
D
1
480
640
800
960
1020
400
2487 F04
320
0
300
200
100
160
V
CC
= 5V
V
= 5V
SLOPE = 2.45 LSB
16
/K
from the output code (where DATAOUT
16
is the decimal
representation of the 16-bit result) for a 5V reference using
the following formula:
If a different value of V
REF
is used, the temperature
output is:
T
DATAOUT
V /12.25 inKelvin
K
=
16
T
DATAOUT
2 45
inKelvin
K
=
16
.
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