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參數(shù)資料
| 型號： | LTC2435CGN#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 26/42頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC DIFF I/REF 20BIT 16-SSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 20 |
| 采樣率（每秒）： | 15 |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 功率耗散（最大）： | 1mW |
| 電壓電源： | 單電源 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個差分，雙極 |
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LTC2435/LTC2435-1
32
24351fc
For more information www.linear.com/LTC2435
applicaTions inForMaTion
Output Data Rate
Whenusingitsinternaloscillator,theLTC2435canproduce
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
canproduceupto13.6readingspersecondwithFO=LOW.
The actual output data rate will depend upon the length of
the sleep and data output phases which are controlled by
theuserandwhichcanbemadeinsignificantlyshort.When
operated with an external conversion clock (FO 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/fEOSC.IffEOSC=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 performance between these
two operation modes.
An increase in fEOSC over the nominal 153600Hz will
translate into a proportional increase in the maximum
outputdatarate.Thissubstantialadvantageisnevertheless
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 fre-
quency.Inmanyapplications,thesubsequentperformance
degradation can be substantially reduced by relying 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.
Theusershouldavoidsingle-endedinputfiltersandshould
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
previoussectionprovidesformulaeforevaluatingtheeffect
ofthesourceresistanceupontheconverterperformancefor
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
externaloscillatorwillstarttodecreasetheeffectivenessof
the internal analog circuits. This will result in a progressive
degradationintheconverteraccuracyandlinearity.Typical
measured performance curves for output data rates up to
200 readings per second are shown in Figures 26 to 33.
Thedegradationbecomesmoreobviousaboveoutputdata
rate of 150Hz, which corresponds to an external oscillator
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 circumstances,
a reduction of the differential reference voltage may be
beneficial.
Figure 26. Offset Error vs Output Data Rate and Temperature
Figure 27. +FS 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 20 40 60 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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