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參數(shù)資料
| 型號： | LTC2435-1IGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 20-Bit No Latency ADCs with Differential Input and Differential Reference |
| 中文描述： | 1-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 30/40頁 |
| 文件大?。?/td> | 463K |
| 代理商： | LTC2435-1IGN |
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LTC2435/LTC2435-1
30
24351fa
APPLICATIU
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 (F
O
= LOW) and 12.5 readings per second with a
notch frequency of 50Hz (F
O
= HIGH) and the LTC2435-1
can produce up to 13.6 readings per second with F
O
=
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 (F
O
connected to an external oscillator), the LTC2435/
LTC2435-1 output data rate can be increased as desired.
The duration of the conversion phase is 10278/f
EOSC
. If
f
EOSC
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 f
EOSC
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 f
EOSC
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 (C
IN
, C
REF
) are used, the
previous section provides formulae for evaluating the
effect of the source resistance upon the converter perfor-
mance for any value of f
EOSC
. If small external input and/
or reference capacitors (C
IN
, C
REF
) 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/f
EOSC
.
W
U
U
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
O
R
)
–300
–310
–320
–330
–340
–350
60
80 100
2435 F26
40
20
120 140 160 180 200
T
A
= 25
°
C
T
A
= 85
°
C
V
INCM
= V
REFCM
V
CC
= V
REF
= 5V
V
IN
= 0V
F
O
= EXT OSC
OUTPUT DATA RATE (READINGS/SEC)
–300
–320
–340
–360
–380
–400
–420
–440
–460
–480
–500
+
R
)
2435 F27
0
20 40 60 80 100 120 140 160 180 200
V
INCM
= V
REFCM
V
CC
= V
F
O
= EXT OSC
T
A
= 25
°
C
T
A
= 85
°
C
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| LTC2435 | 20-Bit No Latency ADCs with Differential Input and Differential Reference |
| LTC2435-1 | 20-Bit No Latency ADCs with Differential Input and Differential Reference |
| LTC2435-1CGN | 20-Bit No Latency ADCs with Differential Input and Differential Reference |
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