PIC24HJ12GP201_11 Datasheet, PDF (227/262 Pages) Microchip Technology – High-Performance, 16-bit Microcontrollers 5-cycle latency

PIC24HJ12GP201/202
FIGURE 22-21:
ADC CONVERSION (12-BIT MODE) TIMING CHARACTERISTICS
(ASAM = 0, SSRC<2:0> = 000)
AD50
ADCLK
Instruction
Execution
Set SAMP
SAMP
AD61
DONE
AD1IF
Clear SAMP
AD60
TSAMP
AD55
12
34 5 6
1 ^{– Software sets AD1CON. SAMP to start sampling.}
2 ^{– Sampling starts after discharge period. TSAMP is described in}
Section16. “Analog-to-Digital Converter (ADC)” (DS70183) in the
“dsPIC33F/PIC24H Family Reference Manual.
3 – Software clears AD1CON. SAMP to start conversion.
4 – Sampling ends, conversion sequence starts.
789
5 ^{– Convert bit 11.}
6 ^{– Convert bit 10.}
7 ^{– Convert bit 1.}
8 ^{– Convert bit 0.}
9 ^{– One TAD for end of conversion.}
TABLE 22-41: ADC CONVERSION (12-BIT MODE) TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(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⁽¹⁾
AD50 TAD
ADC Clock Period
117.6 —
—
ns
—
AD51 tRC
ADC Internal RC Oscillator
—
250
—
ns
—
Period
Conversion Rate
AD55 tCONV Conversion Time
— 14 TAD
ns
—
AD56 FCNV
Throughput Rate
—
— 500 Ksps
—
AD57 TSAMP Sample Time
3.0 TAD —
—
—
—
Timing Parameters
AD60 tPCS
Conversion Start from Sample
Trigger⁽²⁾
2.0 TAD
— 3.0 TAD — Auto Convert Trigger
not selected
AD61 tPSS
Sample Start from Setting
2.0 TAD — 3.0 TAD —
—
Sample (SAMP) bit⁽²⁾
AD62 tCSS
Conversion Completion to
— 0.5 TAD —
—
—
Sample Start (ASAM = 1)⁽²⁾
AD63 tDPU
Time to Stabilize Analog Stage —
—
20
μs
—
from ADC Off to ADC On⁽²⁾
Note 1: Because the sample caps will eventually lose charge, clock rates below 10 kHz can affect linearity
performance, especially at elevated temperatures.
2: These parameters are characterized but not tested in manufacturing.
© 2007-2011 Microchip Technology Inc.
DS70282E-page 227