參數(shù)資料
型號： SX8722I070TRLF
廠商： Semtech
文件頁數(shù)： 57/108頁
文件大?。?/td> 0K
描述： IC ZOOMING ADC 10BIT 16CH 44MLPQ
標準包裝： 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： 標準包裝
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 52
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8722
High gain acquisition for sensor interface
The core of the zooming section is made of three differential programmable amplifiers (PGA). After selection of a
combination of input and reference signals VIN and VREF, the input voltage is modulated and amplified through stages 1 to 3.
Fine gain programming up to 1'000V/V is possible. In addition, the last two stages provide programmable offset. Each
amplifier can be bypassed if needed.
The output of the PGA stages is directly fed to the analog-to-digital converter (ADC), which converts the signal VIN,ADC into
digital.
Like most ADCs intended for instrumentation or sensing applications, the ZoomingADC is an over-sampled converter (See
Note1). The ADC is a so-called incremental converter with bipolar operation (the ADC accepts both positive and negative
input voltages). In first approximation, the ADC output result relative to full-scale (FS) delivers the quantity:
in two's complement (see Section 12.8.7 for details). The output code OUTADC is -FS/2 to +FS/2 for VIN,ADC, -VREF/2 to
+VREF/2 respectively. As will be shown in section 0, VIN,ADC is related to input voltage VIN by the relationship:
where GDTOT is the total PGA gain, and GDoffTOT is the total PGA offset.
Note:
Over-sampled converters are operated with a sampling frequency fS much higher than the input signal's Nyquist rate (typically fS
is 20-1'000 times the input signal bandwidth). The sampling frequency to throughput ratio is large (typically 10-500). These
converters include digital decimation filtering. They are mainly used for high resolution, and/or low-to-medium speed applications.
(Eq. 1)
(Eq. 2)
2
/
2
/
,
REF
ADC
IN
ADC
V
FS
OUT
REF
TOT
IN
TOT
ADC
IN
V
GDoff
V
GD
V
=
,
V
[]
Not
Recommended
for
New
Designs
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SX8723E083TRT 功能描述:IC DAS PRESSURE/TEMP SENS 12MLPD RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:ZoomingADC™ 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件
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