參數(shù)資料
型號(hào)： XE8000EV120
廠商： Semtech
文件頁(yè)數(shù)： 75/108頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR SX8722I070TRLF
標(biāo)準(zhǔn)包裝： 1
系列： ZoomingADC™
ADC 的數(shù)量： 1
位數(shù)： 16
數(shù)據(jù)接口： I²C
工作溫度： -40°C ~ 125°C
已用 IC / 零件： SX8722
已供物品： 板，CD
產(chǎn)品目錄頁(yè)面： 585 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： SX8722I070LFDKR-ND - IC ZOOMING ADC 10BIT 16CH 44MLPQ
SX8722I070LFCT-ND - IC ZOOMING ADC 10BIT 16CH 44MLPQ
SX8722I070LFTR-ND - IC ZOOMING ADC 10BIT 16CH 44MLPQ
其它名稱(chēng)： XM8000EV120
XM8000EV120-ND
ACS - Revision 4.2
October 2008
2008 Semtech Corp.
www.semtech.com
Page 69
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8722
High gain acquisition for sensor interface
to remain within the ADC input range.
Table 57. ADC & PGA power saving modes and maximum sampling frequency
12.9. 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 IB_AMP_PGA[1:0] and IB_AMP_ADC[1:0] (see Table 57). 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.
12.10. Input impedance
The PGAs of the ZoomingADC are a switched capacitor based blocks (see Switched Capacitor Principle chapter). This
means that it does not use resistors to fix gains, but capacitors and switches. This has important implications on the nature
of the input impedance of the block.
Using switched capacitors is the reason why, while a conversion is done, the input impedance on the selected channel of the
PGAs is inversely proportional to the sampling frequency fs and to stage gain as given in Equation 21.
The input impedance observed is the input impedance of the first PGA stage that is enabled or the input impedance of the
ADC if all three stages are disabled.
PGA1 (with a gain of 10), PGA2 (with a gain of 10) and PGA3 (with a gain of 10) each have a minimum input impedance of
256 kOhm at fs = 300 kHz. Larger input impedance can be obtained by reducing the gain and/or by reducing the sampling
frequency. Therefore, with a gain of 1 and a sampling frequency of 75 kHz, Zin > 10.2 MOhm.
The input impedance on channels that are not selected is very high (>100MOhm).
IB_AMP_ADC
[1:0]
IB_AMP_PGA
[1:0]
ADC Bias
Current
PGA Bias
Current
Max. fS [KHz]
00
01
10
11
1/4 x IADC
1/2 x IADC
3/4 x IADC
IADC
37.5
75
150
300
00
01
10
11
1/4 x IADC
1/2 x IADC
3/4 x IADC
IADC
37.5
75
150
300
(Eq. 21)
gain
f
Hz
Z
s
in
Ω
≥
9
10
768
Ohm
[]
Not
Recommended
for
New
Designs
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