SN8F5708 datasheet(125/204 Pages) SONIX

125 / 204 page

www.sonix.com.tw

SN8F5708 Series

ADC

Datasheet Rev. 2.4

125

19.4

Converting Time

The ADC converting time is from ADS=1 (Start to ADC convert) to EOC=1 (End of ADC convert). The

converting time duration is depend on ADC clock rate. 12-bit ADC’s converting time is

1/ (ADC clock /4)*16 sec. ADC clock source is fosc and includes fosc/1, fosc/2, fosc/8 and fosc/16

controlled by ADCKS[1:0] bits.

The ADC converting time affects ADC performance. If input high rate analog signal, it is necessary

to select a high ADC converting rate. If the ADC converting time is slower than analog signal

variation rate, the ADC result would be error. So to select a correct ADC clock rate to decide a right

ADC converting rate is very important.

12 bits ADC conversion time =

ADC clock rate/4

ADCKS[1:0]

ADC clock

rate

fosc = 16MHz

fosc = 32MHz

Converting time

Converting

rate

Converting time

Converting

rate

fosc/16

1/(16MHz/16/4)*16

= 64us

15.625kHz

1/(32MHz/16/4)*16

= 32us

31.25kHz

fosc/8

1/(16MHz/8/4)*16

= 32us

31.25kHz

1/(32MHz/8/4)*16

= 16us

62.5kHz

fosc

1/(16MHz/4)*16

= 4us

250kHz

1/(32MHz/4)*16

= 2us

500kHz

fosc/2

1/(16MHz/2/4)*16

= 8us

125kHz

1/(32MHz/2/4)*16

= 4us

250kHz

19.5

Data Buffer

ADC data buffer is 12-bit length to store ADC converter result. The high byte is ADB register, and

the low-nibble is ADR[3:0] bits. The ADB register is only 8-bit register including bit 4 – bit 11 ADC

data. To combine ADB register and the low-nibble of ADR will get full 12-bit ADC data buffer. The

ADC data buffer is a read-only register and the initial status is unknown after system reset.

SN8F5708 Datasheet(PDF) 125 Page - SONiX Technology Company

SN8F5708 Datasheet(HTML) 125 Page - SONiX Technology Company

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL