參數(shù)資料
型號： XE8000EV121
廠商： Semtech
文件頁數(shù)： 8/53頁
文件大小： 0K
描述： BOARD EVAL FOR SX8723/24
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，傳感器至模數(shù)轉(zhuǎn)換器接口，可編程
嵌入式： 否
已用 IC / 零件： SX8723，SX8724，SX8725
主要屬性： 用于橋型傳感器的信號調(diào)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(guān)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
16
SX8724
ZoomingADC for Pressure and Temperature Sensing
stages 1 to 3. Fine gain programming up to 1'000 V/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 Note
1). The ADC is a so-called incremental converter; with bipolar operation (the ADC accepts
both positive and negative differential input voltages). In first approximation, the ADC output result relative to
full-scale (FS) delivers the quantity:
2
/
2
/
,
ADC
REF
ADC
IN
S
ADC
V
F
OUT
Equation 1
in two's complement (see Equation 4 and Equation 5 for details). The output code OUTADC is -FS/2 to +FS/2 for
VIN,ADC
-V
REF,ADC/2 to +VREF,ADC/2 respectively. As will be shown, VIN,ADC is related to input voltage VIN by the
relationship:
ADC
REF
TOT
IN
TOT
ADC
IN
V
GDoff
V
GD
V
,
=
(V)
Equation 2
where GDTOT is the total PGA gain, and GDoffTOT is the total PGA offset.
1 Note: Over-sampled converters are operated with a sampling frequency f
S 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.
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