参数资料
型号: SX8725CWLTDT
元件分类: ADC
英文描述: 2-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL/PARALLEL ACCESS, PDSO12
封装: 4 X 4 MM, HALOGEN FREE AND ROHS COMPLIANT, MLPD-12
文件页数: 29/68页
文件大小: 1718K
代理商: SX8725CWLTDT
www.semtech.com/products/
Page 35
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
The equivalent LSB size at the input of the PGA chain is:
Notice that the input voltage VIN,ADC of the ADC must satisfy the condition:
to remain within the ADC input range.
7.7.9 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 IbAmpPga[1:0] and IbAmpAdc[1:0] (see Table 21). 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 lifetime.
Equation 22
Equation 23
Table 21. ADC & PGA power saving modes and maximum sampling frequency
IbAmpAdc [1:0]
IbAmpPga [1:0]
ADC Bias Current
PGA Bias Current
Max. fs [kHz]
00
01
11
1/4 x IADC
1/2 x IADC
IADC
125
250
500
00
01
11
1/4 x IPGA
1/2 x IPGA
IPGA
125
250
500
]
/
[
1
2
1
V
OSR
GD
V
LSB
TOT
REF
n
+
=
1
)
(
2
1
,
+
OSR
V
REFN
REFP
ADC
IN
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