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參數(shù)資料
| 型號(hào)： | LTC2495CUHF#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 16-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC38 |
| 封裝： | 5 X 7 MM, PLASTIC, MO-220WKHD, QFN-38 |
| 文件頁數(shù)： | 13/32頁 |
| 文件大小： | 619K |
| 代理商： | LTC2495CUHF#TR |
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LTC2495
0
2495fa
If a different value of VREF is used, the temperature
output is:
T
DATAOUT
12.25
V
in Kelvin
K
REF
=
16
If the value of VREF is not known, the slope is determined
bymeasuringthetemperaturesensorataknowntempera-
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 LTC2495 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 LTC2495 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.
Duringthedatareadcycle,aStopcommandmaybeissued
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).
LTC2495 Address
The LTC2495 has three address pins (CA0, CA1, CA2).
Each may be tied high, low, or left floating enabling one
of 27 possible addresses (see Table 6).
In addition to the configurable addresses listed in Table 6,
the LTC2495 also contains a global address (1110111)
whichmaybeusedforsynchronizingmultipleLTC2495sor
otherLTC24XXdelta-sigmaI2Cdevices(seeSynchronizing
Multiple LTC2495s with a Global Address Call section).
Operation Sequence
The LTC2495 acts as a transmitter or receiver, as shown
in Figure 6. The device may be programmed to perform
several functions. These include input channel selection,
measure the internal temperature, selecting the line fre-
quency rejection (50Hz, 60Hz, or simultaneous 50Hz and
60Hz), a 2x speed mode and gain.
Continuous Read
Inapplicationswheretheinputchannel/configurationdoes
not need to change for each cycle, the conversion can be
continuously performed and read without a write cycle
(see Figure 7). The configuration/input channel remains
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
2495 F05
–5
TEMPERATURE (K)
0
DATAOUT
16
450
600
750
900
1050
400
2495 F04
300
0
300
200
100
150
VCC = 5V
VREF = 5V
SLOPE = 2.45 LSB16/K
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