Reference Source Resistance for CREF <" />
參數(shù)資料
型號(hào): LTC2497CUHF#PBF
廠商: Linear Technology
文件頁(yè)數(shù): 15/28頁(yè)
文件大?。?/td> 0K
描述: IC ADC 16BIT W/PGA 38-QFN
標(biāo)準(zhǔn)包裝: 52
位數(shù): 16
采樣率(每秒): 7.5
數(shù)據(jù)接口: I²C,串行
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 480µW
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: 38-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 38-QFN(5x7)
包裝: 管件
輸入數(shù)目和類型: 16 個(gè)單端,雙極;8 個(gè)差分,雙極
產(chǎn)品目錄頁(yè)面: 1348 (CN2011-ZH PDF)
配用: DC1012A-B-ND - BOARD DELTA SIGMA ADC LTC2497
LTC2497
2497fa
Figure 15. INL vs Differential Input Voltage and
Reference Source Resistance for CREF > 1F
In cases where large bypass capacitors are required on
the reference inputs (CREF > 0.01F), full-scale and linear-
ity errors are proportional to the value of the reference
resistance. Every ohm of reference resistance produces
a full-scale error of approximately 0.5ppm (while operat-
ing with the internal oscillator) (see Figures 13 and 14). If
the input common mode voltage is equal to the reference
common mode voltage, a linearity error of approximately
0.67ppm per 100
W of reference resistance results (see
Figure 15). In applications where the input and reference
common mode voltages are different, the errors increase.
A 1V difference in between common mode input and
common mode reference results in a 6.7ppm INL error
for every 100
W of reference resistance.
applicaTions inForMaTion
VIN/VREF
–0.5
INL
(ppm
OF
V
REF
)
2
6
10
0.3
2497 F15
–2
–6
0
4
8
–4
–8
–10
–0.3
–0.1
0.1
0.5
VCC = 5V
VREF = 5V
VIN(CM) = 2.5V
TA = 25°C
CREF = 10F
R = 1k
R = 100
R = 500
Figure 13. +FS Error vs RSOURCE at VREF (Large CREF)
Figure 14. –FS Error vs RSOURCE at VREF (Large CREF)
RSOURCE ( )
0
+FS
ERROR
(ppm) 300
400
500
800
2497 F13
200
100
0
200
400
600
1000
VCC = 5V
VREF = 5V
VIN+ = 3.75V
VIN– = 1.25V
fO = GND
TA = 25°C
CREF = 1F, 10F
CREF = 0.1F
CREF = 0.01F
RSOURCE ( )
0
–FS
ERROR
(ppm) –200
–100
0
800
2497 F14
–300
–400
–500
200
400
600
1000
VCC = 5V
VREF = 5V
VIN+ = 1.25V
VIN– = 3.75V
fO = GND
TA = 25°C
CREF = 1F, 10F
CREF = 0.1F
CREF = 0.01F
In addition to the reference sampling charge, the reference
ESDprotectiondiodeshaveatemperaturedependentleak-
age current. This leakage current, nominally 1nA (±10nA
max) results in a small, gain error. A 100
W reference
resistance will create a 0.5V full-scale error.
Normal Mode Rejection and Antialiasing
One of the advantages delta-sigma ADCs offer over
conventional ADCs is on-chip digital filtering. Combined
with a large oversample ratio, the LTC2497 significantly
simplifies antialiasing filter requirements. Additionally,
the input current cancellation feature allows external low
pass filtering without degrading the DC performance of
the device.
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