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Document No. 70/0159~02C

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©2005 Peregrine Semiconductor Corp. All rights reserved.

4x4mm -20 Lead QFN

The PE4305 is a high linearity, 5-bit RF Digital Step Attenuator

(DSA) covering a 15.5 dB attenuation range in 0.5 dB steps,

and is pin compatible with the PE430x series. This 50-ohm RF

DSA provides both parallel (latched or direct mode) and serial

CMOS control interface, operates on a single 3-volt supply and

maintains high attenuation accuracy over frequency and

temperature. It also has a unique control interface that allows

the user to select an initial attenuation state at power-up. The

PE4305 exhibits very low insertion loss and low power

consumption. This functionality is delivered in a 4x4 mm QFN

footprint.

The PE4305 is manufactured in Peregrine’s patented Ultra

Thin Silicon (UTSi®) CMOS process, offering the performance

of GaAs with the economy and integration

of conventional

CMOS.

Product Specification

50

Ω RF Digital Attenuator

5-bit, 15.5 dB, DC – 4.0 GHz

Product Description

Figure 1. Functional Schematic Diagram

PE4305

Features

interfaces

over temperature and frequency

Control Logic Interface

Parallel Control

Power-Up Control

Serial Control

RF Input

RF Output

Switched Attenuator Array

6

3

2

Figure 2. Package Type

Notes: 1. Device Linearity will begin to degrade below 1Mhz

2. See Max input rating in Table 2 & Figures on Pages 2 to 4 for data across frequency.

3. Note Absolute Maximum in Table 3.

Parameter

Test Conditions

Frequency

Minimum

Typical

Maximum

Units

Operation Frequency

DC

4000

MHz

DC - 2.2 GHz

-

1.5

2.25

dB

Attenuation Accuracy

Any Bit or Bit

Combination

DC - 2.2 GHz

-

-

±(0.25 + 3% of atten setting)

not to exceed ± 0.4 dB

dB

1 MHz - 2.2 GHz

30

34

-

dBm

Two-tone inputs

+18 dBm

1 MHz - 2.2 GHz

-

52

-

dBm

Return Loss

DC - 2.2 GHz

15

20

-

dB

Switching Speed

50% control to 0.5 dB

of final value

-

-

1

µs