AA, bad play?

[danndann]

dont have anythig on him

MP: $113.40
CO: $30.90
BTN: $51.50
SB: $25.35
BB: $52.30
Hero (UTG): $52

Pre-Flop: A[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/club.gif[/img] dealt to Hero (UTG)
<font color="red">Hero raises to $1.75</font>, 2 folds, BTN calls $1.75, 2 folds

Flop: ($4.25) 7[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $2.50</font>, <font color="red">BTN raises to $7</font>, Hero calls $4.50

Turn: ($18.25) 5[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets $12</font>, Hero calls $12

River: ($42.25) T[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets $30.75 and is All-In</font>, Hero calls $30.75

[Jub.]

What limits we playyig here? i take it 50nl. If so put him in on the turn with CR.