PS20037

Data Sheet

The output of the phase detector feeds a charge pump which combined with an external loop filter integrates the

current pulses to control the varactor voltage. The charge pump current is automatically varied by the VCO control

logic to compensate for VCO gain variations that are dependent on selected sub band. The varactor control voltage

is externally coupled to the oscillator section through the input pin Vvar.

1.4

All programming for the

formats.

either accept data (write mode), or send data (read mode). The LSB of the address byte (R/W) sets the device into

format.

The

PS20037 contains 16 control registers. These registers are read/write registers. These registers are addressed

access sequential write and read as shown below.

Random Access Single Write

Random Access Sequential Write

Stop

Random Access Single Read

Random Access Sequential Read

W

Write bit

A

Acknowledge Bit

N

Not Acknowledge

interface.

Stop

Start

Device

Address

W A

Register

Address

N

A

Register

Data

N

A

Stop

Stop

Start

Device

Address

W A

Register

Address

N

A

Register

Data

N

A

Register

Data

N+1

...

Register

Data

N+M

A

Stop

Stop

Start

Device

Address

W A

Register

Address

N

A

Start

Device

Address

R A

Register

Data

N

N Stop

Stop

Start

Device

Address

W A

Register

Address

N

A

Start

Device

Address

R A

Register

Data

N

A

...

Register

Data

N+M

N Stop

Data Sheet 291468 issue 1

Plessey Semiconductors Ltd.

Design & Technology Centre, Delta 500, Delta Business Park, Great Western Way, Swindon, UK SN5 7XE

Tel: +44 1793 518000

Fax: +44 1793 518030

Web: www.plesseysemi.com

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