Reference Manual

PMAC-Mini PCI Hardware Reference Manual
Connector Pinouts 39
Terminal Block
TB1 (JPWR) (4-Pin Terminal Block)
Pin # Symbol Function Description Notes
1 GND Common Digital Ground
2 +5V Input +5V Supply Reference to digital ground
3 +12V Input +12V to +15V Supply Reference to digital ground
4 -12V Input -12V to -15V Supply Reference to digital ground
This terminal block may be used as an alternative power supply connector if PMAC Lite is not installed in a PC-
bus. The +5V powers the digital electronics. If jumpers E85, E87, and E88 are installed, the +12V and -12V
power the analog output stage (this defeats the optical isolation on PMAC).
To keep the optical isolation between the digital and analog circuits on PMAC, provide analog power (+/-12V to
+/-15V and AGND) through the JMACH connector, instead of the bus connector or this terminal block.