SX8723S データシートの表示（PDF） - Semtech Corporation

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SX8723S

ZoomingADC for sensing data acquisition

Semtech Corporation 

SX8723S

ADVANCED COMMUNICATIONS & SENSING

ZoomingADC for sensing data acquisition

DATASHEET

(9) 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.

(10) DNL is defined as the difference (in LSB) between the ideal (1 LSB) and measured code transitions for successive codes.

(11) Values for Gain = 1. PSRR is defined as the amount of change in the ADC output value as the power supply voltage changes.

(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 1.0

© Semtech

February 2011

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