參數(shù)資料
型號: SX8725E083TRT
廠商: Semtech
文件頁數(shù): 20/53頁
文件大小: 0K
描述: IC DAS PRESSURE/TEMP SENS 12MLPD
標準包裝: 1
系列: ZoomingADC™
類型: 數(shù)據(jù)采集系統(tǒng)(DAS)
輸入類型: 差分
輸出類型: 數(shù)字
接口: I²C
安裝類型: 表面貼裝
封裝/外殼: 12-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 12-MLPD
包裝: 標準包裝
配用: XE8000EV121-ND - BOARD EVAL FOR SX8723/24
其它名稱: SX8725E083DKR
ADVANCED COMMUNICATIONS & SENSING
V1.8 2009 Semtech Corp.
www.semtech.com
27
SX8725
ZoomingADC for Pressure and Temperature Sensing
The equivalent LSB size at the input of the PGA chain is:
1
2
1
,
+
=
OSR
GD
V
LSB
TOT
ADC
REF
n
(V)
Equation 19
Notice that the input voltage VIN,ADC of the ADC must satisfy the condition:
(
)
1
2
1
,
+
OSR
V
REFN
REFP
ADC
IN
(V)
Equation 20
to remain within the ADC input range.
Power Saving Modes
During low-speed operation, the bias current in the PGAs and ADC can be programmed to save power using
the control words IB_AMP_PGA[1:0] and IB_AMP_ADC[1:0] (see Table 17). If the system is idle, the PGAs and
ADC can even be disabled, thus, reducing power consumption to its minimum. This can considerably improve
battery life.
IB_AMP_ADC[1:0]
(RegACCfg1[7:6])
IB_AMP_PGA[1:0]
(RegACCfg1[5:4])
ADC Bias Current
PGA Bias Current
Max. fs [kHz]
00
1/4
IADC
125
01
1/2
IADC
250
11
x
IADC
x
500
00
1/4
IPGA
125
01
1/2
IPGA
250
x
11
x
IPGA
500
Table 17 - ADC & PGA Power Saving Modes and Maximum Sampling Frequency
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