GS4915 Data Sheet
Table 1-1: Pin Descriptions (Continued)
Pin
Name
Timing
Type
Description
Number
36
LF
Analog
Output
Control voltage for the external voltage controlled oscillator. Connect to pin
5 of the GO1555 via a low pass filter. See Typical Application Circuit on
page 22.
37
CP_RES
Analog
Input
Charge pump current control.
Connect to VCO_GND via a 10kΩ resistor.
38
39
CP_VDD
–
–
Power
Power
Power supply for the internal charge pump block (nominally +2.5V DC).
Connect to VCO_VDD (pin 39).
VCO_VDD
Power supply for the external voltage controlled oscillator (+2.5V DC).
Connect to pin 7 of the GO1555. This pin is an output.
Must be isolated from all other power supplies.
–
Ground Pad
–
Power
Ground pad on bottom of package must be soldered to AGND plane of
PCB.
39145 - 3 November 2007
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