REFtranslates into about 0.45ppm additional INL error.
參數(shù)資料
型號(hào): LTC2411-1IMS#PBF
廠商: Linear Technology
文件頁(yè)數(shù): 19/40頁(yè)
文件大?。?/td> 0K
描述: IC A/DCONV DIFF INPUT&REF 10MSOP
標(biāo)準(zhǔn)包裝: 50
位數(shù): 24
采樣率(每秒): 6.8
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: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 10-MSOP
包裝: 管件
輸入數(shù)目和類型: 1 個(gè)差分,雙極
LTC2411/LTC2411-1
26
REFtranslates 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. For the
LTC2411-1, when FO = LOW, every 100 of source
resistance driving REF+ or REFtranslates into about
0.41ppm additional INL error. When FO is driven by an
external oscillator with a frequency fEOSC, every 100 of
source resistance driving REF+ or REFtranslates into
about 2.91 10–6 fEOSCppm additional INL error. Fig-
ure 19 shows the typical INL error due to the source
resistance driving the REF+ or REFpins 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 REFpins does not help the gain or the INL error. The
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)
RSOURCE ()
1
10
100
1k
10k
100k
+FS
ERROR
(ppm
OF
V
REF
)
2411 F17a
0
–10
–20
–30
–40
–50
VCC = 5V
REF+ = 5V
REF = GND
IN+ = 3.75V
IN = 1.25V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
Figure 17a. +FS Error vs RSOURCE at REF+ or REF(Small CIN)
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