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參數(shù)資料
| 型號： | LTC2411CMS |
| 英文描述： | Analog-to-Digital Converter， 24-Bit |
| 中文描述： | 模擬到數(shù)字轉(zhuǎn)換器，24比特 |
| 文件頁數(shù)： | 19/40頁 |
| 文件大小： | 450K |
| 代理商： | LTC2411CMS |
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LTC2411
26
In addition to this gain error, the converter INL perfor-
mance is degraded by the reference source impedance.
When FO = LOW (internal oscillator and 60Hz notch), every
100
of source resistance driving REF+ or REF– translates
into about 0.45ppm additional INL error. When FO = HIGH
(internal oscillator and 50Hz notch), every 100
of source
resistance driving REF+ or REF– translates into about
0.37ppm additional INL error. When FO is driven by an
external oscillator with a frequency fEOSC, every 100 of
source resistance driving REF+ or REF– translates into
about 2.91 10–6 fEOSCppm additional INL error.
Figure 19 shows the typical INL error due to the source
resistance driving the REF+ or REF– pins when large CREF
values are used. The effect of the source resistance on the
two reference pins is additive with respect to this INL error.
In general, matching of source impedance for the REF+
and REF– pins does not help the gain or the INL error. The
user is thus advised to minimize the combined source
impedance driving the REF+ and REF– pins rather than to
try to match it.
The magnitude of the dynamic reference current depends
upon the size of the very stable internal sampling capaci-
tors and upon the accuracy of the converter sampling
clock. The accuracy of the internal clock over the entire
temperature and power supply range is typical better than
APPLICATIO S I FOR ATIO
WU
UU
RSOURCE ()
1
10
100
1k
10k
100k
–
FS
ERROR
(ppm
OF
V
REF
)
2411 F17b
50
40
30
20
10
0
CREF = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
VCC = 5V
REF+ = 5V
REF – = GND
IN+ = 1.25V
IN – = 3.75V
FO = GND
TA = 25°C
RSOURCE ()
0
+FS
ERROR
(ppm
OF
V
REF
)
0
–20
–40
–60
–80
–100
–120
–140
–160
800
2411 F18a
200
400
600
1000
700
100
300
500
900
VCC = 5V
REF+ = 5V
REF– = GND
IN+ = 3.75V
IN – = 1.25V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 1F
CREF = 0.1F
CREF = 10F
Figure 18a. +FS Error vs RSOURCE at REF+ or REF– (Large CIN)
Figure 17b. – FS Error vs RSOURCE at REF+ or REF– (Small CIN)
Figure 18b. – FS Error vs RSOURCE at REF+ or REF– (Large CIN)
RSOURCE ()
0
–
FS
ERROR
(ppm
OF
V
REF
)
160
140
120
100
80
60
40
20
0
800
2411 F18b
200
400
600
1000
700
100
300
500
900
VCC = 5V
REF+ = 5V
REF– = GND
IN+ = 1.25V
IN – = 3.75V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 1F
CREF = 0.1F
CREF = 10F
VINDIF/VREFDIF
–0.5–0.4– 0.3– 0.2– 0.1 0
0.1 0.2 0.3 0.4 0.5
INL
(ppm
OF
V
REF
)
10
9
6
4
2
0
–2
–4
–6
–8
–10
VCC = 5V
REF+ = 5V
REF– = GND
VINCM = 0.5 (IN
+ + IN–) = 2.5V
FO = GND
CREF = 10F
TA = 25°C
RSOURCE = 2k
RSOURCE = 1k
RSOURCE = 500
2411 F19
Figure 19. INL vs Differential Input Voltage (VIN = IN+ = IN–)
and Reference Source Resistance (RSOURCE at REF
+ and REF–)
for Large CREF Values (CREF ≥ 1F)
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