SX8724C Datasheet, PDF (8/67 Pages) Semtech Corporation – ZoomingADC for sensing data acquisition

SX8724C
ADVANCED COMMUNICATIONS & SENSING
ZoomingADC for sensing data acquisition
DATASHEET
(12) Conversion time is given by: TCONV = (NELCONV (OSR + 1) + 1) / fS. OSR can be set between 8 and 1024, in powers of 2. NELCONV can be set to 1,
2, 4 or 8.
(13) 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.
(14) Nominal (maximum) bias currents in PGAs and ADC, i.e. IbAmpPga[1:0] = '11' and IbAmpAdc[1:0] = '11'.
(15) Bias currents in PGAs and ADC set to 3/4 of nominal values, i.e. IbAmpPga[1:0] = '10', IbAmpAdc[1:0] = '10'.
(16) Bias currents in PGAs and ADC set to 1/2 of nominal values, i.e. IbAmpPga[1:0] = '01', IbAmpAdc[1:0] = '01'.
(17) Bias currents in PGAs and ADC set to 1/4 of nominal values, i.e. IbAmpPga[1:0] = '00', IbAmpAdc[1:0] = '00'.
Revision 1.01
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January 2011
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