參數(shù)資料
型號(hào)： XE8000EV120
廠商： Semtech
文件頁(yè)數(shù)： 79/108頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR SX8722I070TRLF
標(biāo)準(zhǔn)包裝： 1
系列： ZoomingADC™
ADC 的數(shù)量： 1
位數(shù)： 16
數(shù)據(jù)接口： I²C
工作溫度： -40°C ~ 125°C
已用 IC / 零件： SX8722
已供物品： 板，CD
產(chǎn)品目錄頁(yè)面： 585 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： SX8722I070LFDKR-ND - IC ZOOMING ADC 10BIT 16CH 44MLPQ
SX8722I070LFCT-ND - IC ZOOMING ADC 10BIT 16CH 44MLPQ
SX8722I070LFTR-ND - IC ZOOMING ADC 10BIT 16CH 44MLPQ
其它名稱： XM8000EV120
XM8000EV120-ND
ACS - Revision 4.2
October 2008
2008 Semtech Corp.
www.semtech.com
Page 72
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8722
High gain acquisition for sensor interface
Finally, remember that power reduction is typically traded off with reduced linearity, larger noise and slower maximum
sampling speed.
12.15. Noise
Ideally, a constant input voltage VIN should result in a constant output code. However, because of circuit noise, the output
code may vary for a fixed input voltage. Thus, a statistical analysis on the output code of 1200 conversions for a constant
input voltage was performed to derive the equivalent noise levels of PGA1, PGA2, and PGA3. The extracted rms output
noise of PGA1, 2, and 3 are given in Table 58: standard output deviation and output rms noise voltage. Figure 37 shows the
distribution for the ADC alone (PGA1, 2, and 3 bypassed). Quantization noise is dominant in this case, and, thus, the ADC
thermal noise is below 16 bits.
The simple noise model of Figure 38 is used to estimate the equivalent input referred rms noise VN,IN of the acquisition chain
in the model of Figure 39. This is given by the relationship:
where VN1, VN2, and VN3 are the output rms noise figures of Table 58, GD1, GD2, and GD3 are the PGA gains of stages 1 to
3 respectively. As shown in this equation, noise can be reduced by increasing OSR and NELCONV (increases the ADC
averaging effect, but reduces noise).
Table 58. PGA Noise Measurements (n = 16 bits, OSR = 512, NELCONV = 2, VREF = 5 V)
Figure 37. ADC Noise (PGA1, 2 & 3 Bypassed, OSR = 512, NELCONV = 2)
(Eq. 24)
Parameter
PGA1
PGA2
PGA3
Standard deviation at ADC output (LSB)
0.85
1.4
1.5
Output RMS noise(uV)
205 x (VN1)
340 x (VN2)
365 x (VN3)
()
ELCONV
N
IN
N
OSR
GD
V
GD
V
GD
V
+
+
=
2
3
2
1
3
2
1
2
1
2
,
]
[
2 rms
V
0
20
40
60
80
-5
-4
-3
-2
-1
0
1
2
3
4
5
Output Code Deviation From Mean Value [LSB]
Oc
cu
ren
ces
[%
o
f
to
tal
sam
p
les
]
Not
Recommended
for
New
Designs
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