參數(shù)資料
型號(hào): SX8722I070TRLF
廠商: Semtech
文件頁(yè)數(shù): 63/108頁(yè)
文件大?。?/td> 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 58
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8722
High gain acquisition for sensor interface
Similarly, the reference voltage is chosen among two differential channels (VREF1 = AC_R(1)-AC_R(0) or VREF2 =
AC_R(3)-AC_R(2)) as shown in Table 42 The selection bit is VMUX. The reference inputs VREFP and VREFN (common-
mode) can be up to the power supply range.
Table 42. Analog input reference selection
12.7. Programmable Gain Amplifiers
The zooming function is implemented with three programmable gain amplifiers (PGA). These are:
PGA1: coarse gain tuning
PGA2: medium gain and offset tuning
PGA3: fine gain and offset tuning
All gain and offset settings are realized with ratios of capacitors. The user has control over each PGA activation and gain, as
well as the offset of stages 2 and 3. These functions are examined hereafter.
12.7.1. PGA & ADC Enabling
Depending on the application objectives, the user may enable or bypass each PGA stage. This is done according to the
word ENABLE and the coding given in Table 43. To reduce power dissipation, the ADC can also be inactivated while idle.
Table 43. PGA and ADC enabling
12.7.2. PGA1
The first stage can have a buffer function (unity gain) or provide a gain of 10 (see Table 44). The voltage VD1 at the output of
PGA1 is:
VMUX
(RegACCfg5[0])
VREFP
VREFN
0AC_R(1)
AC_R(0)
1AC_R(3)
AC_R(2)
Enable [3:0]
Block
XXX0
XXX1
ADC disabled
ADC enabled
XX0X
XX1X
PGA1 disabled
PGA1 enabled
X0XX
X1XX
PGA2 disabled
PGA2 enabled
0XXX
1XXX
PGA3 disabled
PGA3 enabled
(Eq. 5)
IN
D
V
GD
V
=
1
V
[]
Not
Recommended
for
New
Designs
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