datasheet (3).pdf - EEWeb

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dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04 FIGURE 31-27: ADC CONVERSION (12-BIT MODE) TIMING CHARACTERISTICS (ASAM = 0, SSRC = 000) ADCLK Instruction Execution SAMP DONE AD1IF Set SAMP AD61 AD50 Clear SAMP AD60 TSAMP DS70291E-page 388 © 2011 Microchip Technology Inc. AD55 1 2 3 4 5 6 7 8 1 – Software sets AD1CON. SAMP to start sampling. 2 – Sampling starts after discharge period. TSAMP is described in Section 28. “10/12-bit ADC without DMA” (DS70210) in the “dsPIC33F/PIC24H Family Reference Manual”. 3 – Software clears AD1CON. SAMP to start conversion. 4 – Sampling ends, conversion sequence starts. 5 – Convert bit 11. 6 – Convert bit 10. 7 – Convert bit 1. 8 – Convert bit 0. 9 – One TAD for end of conversion. 9
dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04 TABLE 31-46: ADC CONVERSION (12-BIT MODE) TIMING REQUIREMENTS Standard Operating Conditions: 3.0V to 3.6V AC CHARACTERISTICS (unless otherwise stated) Operating temperature -40°C ≤ TA ≤ +85°C for Industrial -40°C ≤ TA ≤ +125°C for Extended Param No. Symbol Characteristic Min. Typ Max. Units Conditions Clock Parameters AD50 TAD ADC Clock Period 117.6 — — ns — AD51 tRC ADC Internal RC Oscillator Period — 250 — ns — Conversion Rate AD55 tCONV Conversion Time — 14 TAD ns — AD56 FCNV Throughput Rate — — 500 Ksps — AD57 TSAMP Sample Time 3 TAD — — — — Timing Parameters AD60 tPCS Conversion Start from Sample Trigger (2) 2 TAD — 3 TAD — Auto convert trigger not selected AD61 tPSS Sample Start from Setting Sample (SAMP) bit (2) 2 TAD — 3 TAD — — AD62 tCSS Conversion Completion to Sample Start (ASAM = 1) (2) — 0.5 TAD — — — AD63 tDPU Time to Stabilize Analog Stage from ADC Off to ADC On (2) — — 20 μs — Note 1: Because the sample caps will eventually lose charge, clock rates below 10 kHz may affect linearity performance, especially at elevated temperatures. 2: These parameters are characterized but not tested in manufacturing. 3: The tDPU is the time required for the ADC module to stabilize at the appropriate level when the module is turned on (AD1CON1=‘1’). During this time, the ADC result is indeterminate. © 2011 Microchip Technology Inc. DS70291E-page 389
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