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參數(shù)資料
| 型號： | 2495 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 8-/16-Channel ツヒ ADC with PGA, Easy Drive and I2C Interface |
| 中文描述： | 16位8-/16-ChannelツヒADC，帶PGA巡回賽，輕松驅動和I2C接口 |
| 文件頁數(shù)： | 19/32頁 |
| 文件大小： | 558K |
| 代理商： | 2495 |
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LTC2495
19
2495f
Speed Mode (SPD)
Every conversion cycle, two conversions are combined
to remove the offset (default mode). This result is free
from offset and drift. In applications where the offset is
not critical, the auto-calibration feature can be disabled
with the benefit of twice the output rate.
While operating in the 2x mode (SPD = 1), the linearity
and full-scale errors are unchanged from the 1x mode
performance. In both the 1x and 2x mode there is no
latency. This enables input steps or multiplexer changes
to settle in a single conversion cycle, easing system over-
head and increasing the effective conversion rate. During
temperature measurements, the 1x mode is always used
independent of the value of SPD.
GAIN (GS2, GS1, GS0)
The input referred gain of the LTC2495 is adjustable
from 1 to 256 (see Tables 5a and 5b). With a gain of 1,
the differential input range is ±V
REF
/2 and the common
mode input range is rail-to-rail. As the gain is increased,
the differential input range is reduced to ±0.5 V
REF
/Gain
but the common mode input range remains rail-to-rail.
As the differential gain is increased, low level voltages
are digitized with greater resolution. At a gain of 256, the
LTC2495 digitizes an input signal range of ±9.76mV with
over 16,000 counts.
Temperature Sensor
The LTC2495 includes an integrated temperature sen-
sor. The temperature sensor is selected by setting
IM = 1. During temperature readings, MUXOUTN/
MUXOUTP remains connected to the selected input chan-
nel. The ADC internally connects to the temperature sensor
and performs a conversion.
The digital output is proportional to the absolute tem-
perature of the device. This feature allows the converter
to perform cold junction compensation for external
thermocouples or continuously remove the temperature
effects of external sensors.
The internal temperature sensor output is 28mV at 27°C
(300°K), with a slope of 93.5μV/°C independent of V
REF
(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
from the output code (where DATAOUT
16
is the decimal
representation of the 16-bit result) for a 5V reference using
the following formula:
T
DATAOUT
2 45
inKelvin
K
=
16
.
APPLICATIONS INFORMATION
Table 5a. Performance vs Gain in Normal Speed Mode (V
CC
= 5V, V
REF
= 5V)
GAIN
1
Input Span
±2.5
LSB
38.1
Noise Free Resolution*
65536
Gain Error
5
Offset Error
0.5
Table 5b. Performance vs Gain in 2x Speed Mode (V
CC
= 5V, V
REF
= 5V)
GAIN
1
Input Span
±2.5
LSB
38.1
Noise Free Resolution*
65536
Gain Error
5
Offset Error
200
*The resolution in counts is calculated as the FS divided by LSB or the RMS noise value, whichever is larger.
4
8
16
32
64
128
256
UNIT
±0.625
9.54
65536
5
0.5
±0.312
4.77
65536
5
0.5
±0.156
2.38
65536
5
0.5
±78m
1.19
65536
5
0.5
±39m
0.596
65536
5
0.5
±19.5m
0.298
32768
5
0.5
±9.76m
0.149
16384
8
0.5
V
μV
Counts
ppm of FS
μV
2
4
8
16
32
64
128
UNIT
±1.25
19.1
65536
5
200
±0.625
9.54
65536
5
200
±0.312
4.77
65536
5
200
±0.156
2.38
65536
5
200
±78m
1.19
65536
5
200
±39m
0.596
45875
5
200
±19.5m
0.298
22937
5
200
V
μV
Counts
ppm of FS
μV
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