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參數(shù)資料
| 型號： | LTC2480 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit ADC with Easy Drive |
| 中文描述： | 16位ADC的易道 |
| 文件頁數(shù)： | 15/40頁 |
| 文件大?。?/td> | 535K |
| 代理商： | LTC2480 |
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15
LTC2480
2480f
APPLICATIU
Table 2a. The LTC2480 Performance vs GAIN in Normal Speed Mode (V
CC
= 5V, V
REF
= 5V)
GAIN
1
4
Input Span
±
2.5
±
0.625
LSB
38.1
9.54
Noise Free Resolution*
65536
65536
Gain Error
5
5
Offset Error
0.5
0.5
W
U
U
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
±
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
±
V
REF
/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 (V
CC
= 5V, V
REF
= 5V)
GAIN
1
2
Input Span
±
2.5
±
1.25
LSB
38.1
19.1
Noise Free Resolution*
65536
65536
Gain Error
5
5
Offset Error
200
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
UNIT
±
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
μ
V
Counts
ppm of FS
μ
V
8
16
32
64
128
256
UNIT
±
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
μ
V
Counts
ppm of FS
μ
V
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