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The PE43404 is a high linearity, 4-bit RF Digital Step

Attenuator (DSA) covering a 15 dB attenuation range in 1.0 dB

steps. 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 SP43404 exhibits very low insertion

loss and low power consumption. This functionality is delivered

in a 4x4 mm QFN footprint.

The SP43404 is manufactured on SIPAT’s CMOS

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

4-bit, 15 dB, DC – 2.0 GHz

Product Description

Figure 1. Functional Schematic Diagram

SP43404

Features

interfaces

•

Parallel latched or direct mode

over temperature and frequency

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

2. Max input rating in Table 3 & Figures on Pages 4 to 6 for data across frequency.

3. Note Absolute Maximum in Table 3.

4. Measured in a 50

Ω system.

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

-

-

±(0.25+ 7% of atten setting)

dB

1 MHz

≤ 1.2 GHz

30

34

-

dBm

Two-tone inputs up to

+18 dBm

1 MHz

≤ 1.2 GHz

-

52

-

dBm

Return Loss

Zo = 75 ohms

DC

≤ 1.2 GHz

10

13

-

dB

Switching Speed

50% control

-

-

1

µs

Figure 2. Package Type

20 Lead 4x4 mm QFN

Control Logic Interface

Parallel Control

Power-Up Control

Serial Control

RF Input

RF Output

Switched Attenuator Array

5

3

1

The SP43404 is a high linearity, 4-bit RF Digital Step

Tel: +86-23-62808818

Fax: +86-23-62805284

www.si

w.com sawmkt@si at.com

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