參數(shù)資料
型號(hào): SX8722I070TRLF
廠商: Semtech
文件頁(yè)數(shù): 68/108頁(yè)
文件大小: 0K
描述: IC ZOOMING ADC 10BIT 16CH 44MLPQ
標(biāo)準(zhǔn)包裝: 1
類型: 壓力傳感器
輸入類型: 邏輯
輸出類型: 邏輯
接口: I²C
電流 - 電源: 300µA
安裝類型: 表面貼裝
封裝/外殼: 44-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 44-MLPQ(7x7)
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面: 585 (CN2011-ZH PDF)
配用: XE8000EV120-ND - BOARD EVAL FOR SX8722I070TRLF
其它名稱: SX8722I070LFDKR
ACS - Revision 4.2
October 2008
2008 Semtech Corp.
www.semtech.com
Page 62
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8722
High gain acquisition for sensor interface
where the total PGA gain is defined as:
and the total PGA offset is:
12.8. ADC Characteristics
The main performance characteristics of the ADC (resolution, conversion time, etc.) are determined by three programmable
parameters:
Oversampling frequency fS,
over-sampling ratio OSR, and
number of elementary conversions NELCONV.
The setting of these parameters and the resulting performances are described hereafter.
12.8.1. Conversion Sequence
A conversion is started each time the bit START or the bit DEF is set. As depicted in Figure 3, a complete analog-to-digital
conversion sequence is made of a set of NELCONV elementary incremental conversions and a final quantization step. Each
elementary conversion is made of (OSR+1) sampling periods TS=1/fS, i.e.:
The result is the mean of the elementary conversion results. An important feature is that the elementary conversions are
alternatively performed with the offset of the internal amplifiers contributing in one direction and the other to the output code.
Thus, converter internal offset is eliminated if at least two elementary sequences are performed (i.e. if NELCONV = 2). A few
additional clock cycles are also required to initiate and end the conversion properly.
(Eq. 10)
(Eq. 11)
(Eq. 12)
1
2
3
GD
TOT
=
V
[]
2
3
GDoff
GD
GDoff
TOT
+
=
VV
[]
S
ELCONV
f
OSR
T
/
)
1
(
+
=
s
[]
Not
Recommended
for
New
Designs
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