參數(shù)資料
型號(hào)： LT2435CGN#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 1-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 24/40頁(yè)
文件大?。?/td> 458K
代理商： LT2435CGN#PBF
LTC2435/LTC2435-1
30
24351fb
APPLICATIO S I FOR ATIO
WU
U
Output Data Rate
When using its internal oscillator, the LTC2435 can pro-
duce up to 15 readings per second with a notch frequency
of 60Hz (FO = LOW) and 12.5 readings per second with a
notch frequency of 50Hz (FO = HIGH) and the LTC2435-1
can produce up to 13.6 readings per second with FO =
LOW. The actual output data rate will depend upon the
length of the sleep and data output phases which are
controlled by the user and which can be made insignifi-
cantly short. When operated with an external conversion
clock (FOconnectedtoanexternaloscillator),theLTC2435/
LTC2435-1 output data rate can be increased as desired.
The duration of the conversion phase is 10278/fEOSC. If
fEOSC = 153600Hz, the converter behaves as if the internal
oscillator is used and the notch is set at 60Hz. There is no
significant difference in the LTC2435/LTC2435-1 perfor-
mance between these two operation modes.
An increase in fEOSC over the nominal 153600Hz will
translate into a proportional increase in the maximum
output data rate. This substantial advantage is nevertheless
accompanied by three potential effects, which must be
carefully considered.
First, a change in fEOSC will result in a proportional change
in the internal notch position and in a reduction of the
converter differential mode rejection at the power line
frequency. In many applications, the subsequent perfor-
mance degradation can be substantially reduced by rely-
ing upon the LTC2435/LTC2435-1’s exceptional common
mode rejection and by carefully eliminating common
mode to differential mode conversion sources in the input
circuit. The user should avoid single-ended input filters
and should maintain a very high degree of matching and
symmetry in the circuits driving the IN+ and IN– pins.
Second, the increase in clock frequency will increase
proportionally the amount of sampling charge transferred
through the input and the reference pins. If large external
input and/or reference capacitors (CIN, CREF) are used, the
previous section provides formulae for evaluating the
effect of the source resistance upon the converter perfor-
mance for any value of fEOSC. If small external input and/
or reference capacitors (CIN, CREF) are used, the effect of
the external source resistance upon the LTC2435/
LTC2435-1 typical performance can be inferred from
Figures 16, 17, 21 and 22 in which the horizontal axis is
scaled by 153600/fEOSC.
Third, the internal analog circuits are optimized for normal
operation; therefore an increase in the frequency of the
external oscillator will start to decrease the effectiveness
of the internal analog circuits. This will result in a progres-
sive degradation in the converter accuracy and linearity.
Typical measured performance curves for output data rates
up to 200 readings per second are shown in Figures 26 to
33. The degradation becomes more obvious above output
data rate of 150Hz, which corresponds to an external os-
cillator of 1.536MHz. In order to obtain the highest possible
level of accuracy from this converter at output data rates
above 150 readings per second, the user is advised to
maximize the power supply voltage used and to limit the
maximum ambient operating temperature. In certain cir-
cumstances, a reduction of the differential reference volt-
age may be beneficial.
Figure 27. + FS Error vs Output Data Rate and Temperature
Figure 26. Offset Error vs Output Data Rate and Temperature
OUTPUT DATA RATE (READINGS/SEC)
0
OFFSET
ERROR
(ppm
OF
V
REF
)
–300
–310
–320
–330
–340
–350
60
80 100
2435 F26
40
20
120 140 160 180 200
TA = 25°C
TA = 85°C
VINCM = VREFCM
VCC = VREF = 5V
VIN = 0V
FO = EXT OSC
OUTPUT DATA RATE (READINGS/SEC)
–300
–320
–340
–360
–380
–400
–420
–440
–460
–480
–500
+FS
ERROR
(ppm
OF
V
REF
)
2435 F27
0
204060 80 100 120 140 160 180 200
VINCM = VREFCM
VCC = VREF = 5V
FO = EXT OSC
TA = 25°C
TA = 85°C
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