Document No. 70-0162-04

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©2003-2006 Peregrine Semiconductor Corp. All rights reserved.

20 Lead 4x4 mm QFN

The PE4308 is a high linearity, 5-bit RF Digital Step Attenuator

(DSA) covering 31 dB attenuation range in 1dB steps, and is

pin compatible with the PE430x series. This 75-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

PE4308 exhibits very low insertion loss and low power

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

footprint.

The PE4308 is manufactured on Peregrine’s UltraCMOS™

process, a patented variation of silicon-on-insulator (SOI)

technology on a sapphire substrate, offering the performance

of GaAs with the economy and integration of conventional

CMOS.

Product Specification

75

Ω RF Digital Attenuator

5-bit, 31 dB, DC – 4.0 GHz

Product Description

Figure 1. Functional Schematic Diagram

PE4308

Features

interfaces

over temperature and frequency

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

2. See figures on Pages 4 to 6 for data across frequency.

3. Note Absolute Maximum in Table 3.

4. Measured in a 50

Ω system.

Control Logic Interface

Parallel Control

Power-Up Control

Serial Control

RF Input

RF Output

Switched Attenuator Array

5

3

2

Parameter

Test Conditions

Frequency

Minimum

Typical

Maximum

Units

Operation Frequency

DC

2000

MHz

DC

≤ 1.2 GHz

-

1.4

1.95

dB

Attenuation Accuracy

Any Bit or Bit

Combination

DC

≤ 1.2 GHz

-

-

±(0.2 + 4% of atten setting)

Not to Exceed +0.4 dB

dB

dB

1 dB Compression3,4

1 MHz

≤ 1.2 GHz

30

34

-

dBm

Two-tone inputs up to

+18 dBm

1 MHz

≤ 1.2 GHz

-

52

-

dBm

Return Loss

DC

≤ 1.2 GHz

10

13

-

dB

Switching Speed

50% control to 0.5 dB

of final value

-

-

1

µs

Figure 2. Package Type