REV-A TO REV-B UPDATES

1)  Swapped orientation of C47 and C41
2)  Updated PCB decal of Q3, Q7, Q9, Q11 and Q12
3)  Updated U5 Pin 7 from SLP to AD1
4)  Updated U20 Pin10 Net from DGND to ISOGND
5)  Updated U7 Pin16 Net from NC to VA-
6)  Added U23 Buffer
7)  Added Q12, Q13, R54, R55 and R58 for U23 shutdown
8)  Renamed OAMP_SHDN Net to VRS_BUFF_SHDN
9)  Renamed BUFF_SHDN Ner to TEMP_BUFF_SHDN
10) Removed 1WIRE_SHDN Net and replaced with VK_BUFF_SHDN Net
11) Removed R50 and REF_ELECTRODE Net
12) J6-5 is now AGND
13) J6 retaining pins need solder pads
14) J2 should now be routed like J3 (in the absense of R50)
15) Changed value of R37 and R38 from 1M to 10k
16) Changed U21 from LT1121-3.3 to LM2936BM-3.3 SO8(M)
17) Added C56 (0.22uF) 16V SMD 0805
18) Added R56 (27k) 1/8W SMD 0805
19) Added R57 (8K) 1/8W SMD 0805
20) Added D9 1N914 same part as D7
21) Removed R21
22) Relocated TP3
23) Added values to R24, R25, R26 and R27
24) Added 0805 chip footprint values to C56, R56, and R57.  (JROSAL 5/13/11)
25) Added SOIC-8 footprint value to U21. (JROSAL 5/13/11)
26) Regenerated netlist. (JROSAL 5/13/11)