PS2500 2.2 GHz Fractional-N Frequency Synthesizer
- 14 -
Philsar Semiconductor Inc.
146 Colonnade Road S.
Nepean, Ontario, Canada
K2E 7Y1
Tel: 613-274-0922
Fax: 613-274-0915
www.philsar.com
PMP-001-DS2 V1.2
Note: Associated pairs of power and ground pins need to be decoupled using 0.1
µF capacitors.
Note: The PS2500 is supplied in an exposed pad 28-pin TSSOP package (EP-TSSOP). The exposed
pad is located on the bottom side of the package, and must be connected to ground for proper operation.
The exposed pad should be soldered directly to the circuit board.
CPout_aux
Pin 20
Analog Output
Auxiliary charge pump output. The gain of the auxiliary
charge pump phase detector can be controlled from the
General Synthesizer Registers.
LD/PSaux
Pin 18
Analog Output
Programmable output pin. Indicates auxiliary phase detector
out-of-lock as an active low pulsing open collector output (high
impedance when lock is detected), or assists the loop filter in
steering the auxiliary VCO.
This pin is configured from the General Synthesizer Registers.
VCCdigital
Pin 26
Power and Ground
Digital 3 Volts.
GNDdigital
Pin 25
Power and Ground
Digital Ground.
VCCxtal
Pin 16
Power and Ground
Crystal oscillator ECL/CML 3 Volts.
GNDxtal
Pin 17
Power and Ground
Crystal Oscillator Ground.
VCCecl/cml
Pins 6,
24
Power and Ground
ECL/CML 3 Volt. Removing power safely powers down the
associated divider chain and charge pump.
GNDecl/cml
Pin 5
Power and Ground
ECL/CML Ground.
VCCcp_main, VCCcp_aux
Pins 10,
19
Power and Ground
Main and auxiliary charge pump 3 to 5 Volt. Removing power
safely powers down the associated divider chain and charge
pump.
GNDcp_main, GNDcp_aux
Pin 26
Power and Ground
Main and auxiliary charge pump Ground.
VSUBdigital
Pin 4
-
Substrate isolation, connect to Ground
Pin Label
Pin #
Type
Description
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