Datasheet

© 2008 Microchip Technology Inc. DS80280G-page 5
PIC24HJXXXGPX06/X08/X10
2. Module: 12-bit ADC
When the ADC module is configured for 12-bit
operation, the specifications in the data sheets are
not met.
Work around
Implement the ADC module as an 11-bit ADC with
a maximum conversion rate of 300 ksps.
1. The specifications in Table 1 reflect 11-bit ADC
operation. RIN source impedance is
recommended as 200 ohms and sample time
is recommended as 3 T
AD to ensure
compatibility on future enhanced ADC
modules. Missing codes are possible every 2
7
codes.
2. When used as a 10-bit ADC, the INL is <±2
Least Significant Bytes (LSBs), and DNL
is <±1 LSB with no missing codes. Maximum
conversion rate is 300 ksps.
TABLE 1: ADC PERFORMANCE (11-BIT OPERATION)
Param No. Symbol Min Typical Max Units Conditions
AD17 RIN — — 200 Ohm 12-bit
ADC Accuracy – Measurements taken with External V
REF+/VREF-
AD20a Nr — 12 bits — Bits —
AD21a INL -2 — 2 LSB —
AD22a DNL -1.5 — 1 LSB —
AD23a GERR 1 5 10 LSB —
AD24a EOFF 1 3 6 LSB —
ADC Accuracy – Measurements taken with Internal V
REF+/VREF-
AD21aa INL -2 — 2 LSB —
AD22aa DNL -1.5 — 1 LSB —
AD23aa GERR 5 10 20 LSB —
AD24aa EOFF 3 6 15 LSB —
Dynamic Performance
AD33a FNYQ — — 150 KHz —
AD34a ENOB 9.5 9.6 10.4 Bits —
ADC Conversion Rate
AD56a FCNV — — 300 ksps —
AD57a TSAMP — 3 T
AD —— —