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(qū)動和I2C接口
文件頁數(shù)： 24/32頁
文件大小： 558K
代理商： 2495
LTC2495
24
2495f
In applications where the input common mode voltage is
equal to the reference common mode voltage, as in the
case of a balanced bridge, both the differential and com-
mon mode input current are zero. The accuracy of the
converter is not compromised by settling errors.
In applications where the input common mode voltage is
constant but different from the reference common mode
voltage, the differential input current remains zero while
the common mode input current is proportional to the
difference between V
IN(CM)
and V
REF(CM)
. For a reference
common mode voltage of 2.5V and an input common mode
of 1.5V, the common mode input current is approximately
0.74μA (in simultaneous 50Hz/60Hz rejection mode). This
common mode input current does not degrade the accuracy
if the source impedances tied to IN
+
and IN
–
are matched.
Mismatches in source impedance lead to a fixed offset
error but do not effect the linearity or full-scale reading.
A 1% mismatch in a 1k source resistance leads to a 74μV
shift in offset voltage.
In applications where the common mode input voltage
varies as a function of the input signal level (single-ended
type sensors), the common mode input current varies
proportionally with input voltage. For the case of balanced
input impedances, the common mode input current effects
are rejected by the large CMRR of the LTC2495, leading
to little degradation in accuracy. Mismatches in source
impedances lead to gain errors proportional to the dif-
ference between the common mode input and common
mode reference. A 1% mismatch in 1k source resistances
lead to gain errors on the order of 15ppm. Based on the
stability of the internal sampling capacitors and the ac-
curacy of the internal oscillator, a one-time calibration will
remove this error.
In addition to the input sampling current, the input ESD
protection diodes have a temperature dependent leakage
current. This current, nominally 1nA (±10nA max), results
in a small offset shift. A 1k source resistance will create a
1μV typical and a 10μV maximum offset voltage.
Automatic Offset Calibration of External Buffers/
Amplifiers
In addition to the Easy Drive input current cancellation,
the LTC2495 allows an external amplifier to be inserted
between the multiplexer output and the ADC input (see
Figure 12). This is useful in applications where balanced
source impedances are not possible. One pair of external
buffers/amplifiers can be shared between all 17 analog
inputs. The LTC2495 performs an internal offset calibration
Figure 12. External Buffers Provide High Impedance Inputs
and Amplifier Offsets are Automatically Cancelled.
APPLICATIONS INFORMATION
–
1/2 LTC6078
+
–
1/2 LTC6078
+
1
2
3
5
6
7
Σ
ADC
WITH
EASY DRIVE
INPUTS
INPUT
MUX
M
M
17
2495 F12
LTC2495
ANALOG
INPUTS
SCL
SDA
0.1
μ
F
1k
1k
0.1
μ
F
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