參數(shù)資料
型號: XE8000EV121
廠商: Semtech
文件頁數(shù): 39/53頁
文件大?。?/td> 0K
描述: BOARD EVAL FOR SX8723/24
標準包裝: 1
主要目的: 接口,傳感器至模數(shù)轉換器接口,可編程
嵌入式:
已用 IC / 零件: SX8723,SX8724,SX8725
主要屬性: 用于橋型傳感器的信號調節(jié)
次要屬性: GUI,最多 16 位,1/12 ~ 1000 可編程增益,I2C 接口
已供物品: 板,CD
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
相關產(chǎn)品: SX8725E083DKR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082DKR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083CT-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082CT-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083TR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082TR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
ADVANCED COMMUNICATIONS & SENSING
V1.23 2009 Semtech Corp.
www.semtech.com
44
SX8724
ZoomingADC for Pressure and Temperature Sensing
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 33: standard output deviation
and output rms noise voltage. Figure 24 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 25 is used to estimate the equivalent input referred rms noise VN,IN of the
acquisition chain in the model of Figure 26. This is given by the relationship:
(
)
ELCONV
N
IN
N
OSR
GD
V
GD
V
GD
V
+
+
=
2
3
2
1
3
2
1
2
1
2
,
(V
2rms)
Equation 25
where VN1, VN2, and VN3 are the output rms noise figures of Table 33, 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).
Parameter
PGA1
PGA2
PGA3
Standard
deviation
at
ADC
output (LSB)
0.85
1.4
1.5
Output rms noise (V)
205 (VN1)
340 (VN2)
365 (VN3)
Table 33 - PGA Noise Measurements (n = 16 bits, OSR = 512, NELCONV = 2, VREF = 5 V)
相關PDF資料
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NR4012T330M INDUCTOR 33UH 20% SMD
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