sx8723s Semtech Corporation, sx8723s Datasheet - Page 8
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sx8723s
Manufacturer Part Number
sx8723s
Description
Zoomingadc For Sensing Data Acquisition
Manufacturer
Semtech Corporation
Datasheet
1.SX8723S.pdf
(68 pages)
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Revision 1.0
© Semtech
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ADVANCED COMMUNICATIONS & SENSING
INL defined as the deviation of the DC transfer curve of each individual code from the best-fit straight line. This specification holds over
the full scale.
DNL is defined as the difference (in LSB) between the ideal (1 LSB) and measured code transitions for successive codes.
Values for Gain = 1. PSRR is defined as the amount of change in the ADC output value as the power supply voltage changes.
Conversion time is given by: T
2, 4 or 8.
PGAs are reset after each writing operation to registers RegACCfg1-5, corresponding to change of configuration or input switching. The
ADC should be started only some delay after a change of PGA configuration through these registers. Delay between change of configura-
tion of PGA or input channel switching and ADC start should be equivalent to OSR (between 8 and 1024) number of cycles. This is done by
writing bit Start several cycles after PGA settings modification or channel switching. This delay does not apply to conversions made with-
out the PGAs.
Nominal (maximum) bias currents in PGAs and ADC, i.e. IbAmpPga[1:0] = '11' and IbAmpAdc[1:0] = '11' .
Bias currents in PGAs and ADC set to 3/4 of nominal values, i.e. IbAmpPga[1:0] = '10' , IbAmpAdc[1:0] = '10' .
Bias currents in PGAs and ADC set to 1/2 of nominal values, i.e. IbAmpPga[1:0] = '01' , IbAmpAdc[1:0] = '01' .
Bias currents in PGAs and ADC set to 1/4 of nominal values, i.e. IbAmpPga[1:0] = '00' , IbAmpAdc[1:0] = '00' .
February 2011
CONV
= (N
ELCONV
(OSR + 1) + 1) / f
Page 8
S
. OSR can be set between 8 and 1024, in powers of 2. N
ZoomingADC for sensing data acquisition
SX8723S
www.semtech.com
DATASHEET
ELCONV
can be set to 1,
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