sx8725c Semtech Corporation, sx8725c Datasheet - Page 8

• Manufacturer Part Number: sx8725c
• Description: Zoomingadc For Sensing Data Acquisition
• Manufacturer: Semtech Corporation

Revision 1.01
© Semtech
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ADVANCED COMMUNICATIONS & SENSING
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' .
January 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
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SX8725C
DATASHEET
ELCONV
can be set to 1,