参数资料
型号: SX8724E082TDT
厂商: Semtech
文件页数: 20/53页
文件大小: 0K
描述: IC DAS PRESS/TEMP SENS 16MLPQ
标准包装: 1
系列: ZoomingADC™
类型: 数据采集系统(DAS)
输入类型: 差分
输出类型: 数字
接口: I²C
安装类型: 表面贴装
封装/外壳: 16-VQFN 裸露焊盘
供应商设备封装: 16-MLPQ(4x4)
包装: 标准包装
产品目录页面: 585 (CN2011-ZH PDF)
其它名称: SX8724E082TDTDKR
ADVANCED COMMUNICATIONS & SENSING
V1.23 2009 Semtech Corp.
www.semtech.com
27
SX8724
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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