參數(shù)資料
型號: SX8722I070TRLF
廠商: Semtech
文件頁數(shù): 56/108頁
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 51
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8722
High gain acquisition for sensor interface
12. ZoomingADC
12.1. ZoomingADC Features
The ZoomingADC is a complete and versatile low-power analog front-end interface typically intended for sensing
applications.
The key features of the ZoomingADC are:
Programmable 6 to 16-bit dynamic range oversampled ADC
Flexible gain programming between 0.5 and 1000
Flexible and large range offset compensation
4-channel differential or 8-channel single-ended input multiplexer
2-channel differential reference inputs
Power saving modes
12.1.1. Overview
Figure 31. ZoomingADC general functional block diagram
The total acquisition chain consists of an input multiplexer, 3 programmable gain amplifier stages and an oversampled A/D
converter. The reference voltage can be selected on two different channels. Two offset compensation amplifiers allow for a
wide offset compensation range. The programmable gain and offset allow to zoom in on a small portion of the reference
voltage defined input range.
12.2. Acquisition Chain
The figure above shows the general block diagram of the acquisition chain (AC).
Analog inputs can be selected among eight input channels, while reference input is selected between two differential
channels.
+
-
+
-
+
-
PGA2
+
-
+
-
ADC
+
-
PGA1
PGA3
+
-
+
-
1
2
3
4
5
6
7
0
1
2
3
+
-
+
-
OFF3
OFF2
AC
AR
MUX
MU
X
VIN, ADC
VIN
VREF
fS
16 bits
Not
Recommended
for
New
Designs
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