Directly driving the ADC is pretty simple. Here is a code snip from a PIC 18LF4620 job. This is for an 8 bit result. Change the ADCON2 definition for 10 bits.

Code:
GetECG:          '
   trisa.2 = 1
   ADCON0 = %00001001 'Ch2 selected, Go/Done = 0, ADC ON    
   ADCON1 = %00001100 'VRef = Vdd, Vss, <2:0> analog  
   ADCON2 = %00111111 'Left just (=8 bit), ADacq time = 20 Tad, ADClk = RC 
   pauseus 50
   ADCON0.1 = 1      'start conversion
   ADCNotDone:
      if adcon0.1 = 1 then adcnotdone
   ecgval = adresh 
   if ecgval > MaxECG then MaxECG = ecgval   ' find MAX  
   if ecgval < MinECG then MinECG = ecgval     ' find MIN
'Turn ADC OFF
   ADCON0 = %00000000 'AD OFF, Ch0 selected, Go/Done = 0
return

HTH
BrianT