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SX8723CWLTDT Datasheet(PDF) 8 Page - Semtech Corporation |
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SX8723CWLTDT Datasheet(HTML) 8 Page - Semtech Corporation |
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8 / 67 page  www.semtech.com/products/ Page 8 ADVANCED COMMUNICATIONS & SENSING DATASHEET SX8723C ZoomingADC for sensing data acquisition Revision 1.01 January 2011 © Semtech (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'. |
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