Power Requirements
The Lassen iQ GPS module requires +3.3 VDC ±0.3 VDC at 33 mA, typical excluding the antenna. The on-board capacitance is 10 ìF. An important design consideration for power is the module's internal clock frequency at 12.504 MHz ± 3 KHz. Interference spurs on prime power in this narrow frequency band should be kept to less than 1mV. The receiver does not require any special power up or down sequencing. The receiver power is supplied through pin 7 of the I/O connector.
The Power supply can be derived from +5V to +3.3V by using the Regulator IC LM317. The circuit diagram is gven below.
Power Supply for Trimble's Lassen IQ GPS Reciever
Power Supply for Trimble's Lassen IQ GPS Reciever