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參數(shù)資料
| 型號(hào)： | LTC2480CMS#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 7/40頁 |
| 文件大?。?/td> | 601K |
| 代理商： | LTC2480CMS#TR |
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15
LTC2480
2480fa
APPLICATIO S I FOR ATIO
WU
UU
GAIN (GS2, GS1, GS0)
The input referred gain of the LTC2480 is adjustable from
1 to 256. With a gain of 1, the differential input range is
±VREF/2 and the common mode input range is rail-to-rail.
As the GAIN is increased, the differential input range is
reduced to
±VREF/2 GAIN but the common mode input
range remains rail-to-rail. As the differential gain is in-
creased, low level voltages are digitized with greater
resolution. At a gain of 256, the LTC2480 digitizes an input
signal range of
±9.76mV with over 16,000 counts.
Temperature Sensor (IM)
The LTC2480 includes an on-chip temperature sensor. The
temperature sensor is selected by setting IM = 1 in the serial
input data stream. Conversions are performed directly on
the temperature sensor by the converter. While operating
in this mode, the device behaves as a temperature to bits
converter. The digital reading is proportional to the abso-
lute temperature of the device. This feature allows the
converter to linearize temperature sensors or continuously
remove temperature effects from external sensors. Several
applications leveraging this feature are presented in more
detail in the applications section. While operating in this
mode, the gain is set to 1 and the speed is set to normal in-
dependent of the control bits (GS2, GS1, GS0 and SPD).
Rejection Mode (FA, FB)
The LTC2480 includes a high accuracy on-chip oscillator
with no required external components. Coupled with a 4th
order digital lowpass filter, the LTC2480 rejects line fre-
quency noise. In the default mode, the LTC2480 simulta-
neously rejects 50Hz and 60Hz by at least 87dB. The
LTC2480 can also be configured to selectively reject 50Hz
or 60Hz to better than 110dB.
Speed Mode (SPD)
The LTC2480 continuously performs offset calibrations.
Every conversion cycle, two conversions are automati-
cally performed (default) and the results combined. This
result is free from offset and drift. In applications where
the offset is not critical, the autocalibration feature can be
disabled with the benefit of twice the output rate.
Linearity, full-scale accuracy and full-scale drift are iden-
tical for both 2x and 1x speed modes. In both the 1x and
2x speed there is no latency. This enables input steps or
multiplexer channel changes to settle in a single conversion
cycle easing system overhead and increasing the effective
conversion rate.
Table 2b. The LTC2480 Performance vs GAIN in 2x Speed Mode (VCC = 5V, VREF = 5V)
GAIN
1248
16
32
64
128
UNIT
Input Span
±2.5
±1.25
±0.625
±0.312
±0.156
±78m
±39m
±19.5m
V
LSB
38.1
19.1
9.54
4.77
2.38
1.19
0.596
0.298
V
Noise Free Resolution*
65536
45875
22937
Counts
Gain Error
55555555
ppm of FS
Offset Error
200
V
*The resolution in counts is calculated as the FS divided by LSB or the RMS noise value, whichever is larger.
Table 2a. The LTC2480 Performance vs GAIN in Normal Speed Mode (VCC = 5V, VREF = 5V)
GAIN
1
4
8
16
32
64
128
256
UNIT
Input Span
±2.5
±0.625
±0.312
±0.156
±78m
±39m
±19.5m
±9.76m
V
LSB
38.1
9.54
4.77
2.38
1.19
0.596
0.298
0.149
V
Noise Free Resolution*
65536
32768
16384
Counts
Gain Error
55555558
ppm of FS
Offset Error
0.5
V
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