PIC24HJ12GP201 Datasheet, PDF (216/234 Pages) Microchip Technology – High-Performance, 16-Bit Microcontrollers

PIC24HJ12GP201/202
FIGURE 21-17:
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}
Section 28. “10/12-bit ADC without DMA” in the “PIC24H Family
Reference Manual”. Refer to the Microchip web site for the latest
PIC24H Family Reference Manual chapters.
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 21-37: 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
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⁾
— 1.0 TAD —
— Auto Convert Trigger
not selected
AD61 tPSS
Sample Start from Setting
0.5 TAD — 1.5 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
1
—
5
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.
DS70282B-page 214
Preliminary
© 2007 Microchip Technology Inc.