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The SP4304 is a 75-ohm high-linearity, 6-bit RF Digital Step

Attenuator (DSA) covering a 31.5 dB attenuation range in 0.5

dB steps. The SP4304 provides both a 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 SP4304 exhibits very low insertion loss

and low power consumption. This functionality is delivered in a

4x4 mm QFN footprint.

The SP4304 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

6-bit, 31.5 dB, DC – 2.0 GHz

Product Description

Figure 1. Functional Schematic Diagram

SP4304

Features

applications

interfaces

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.

Control Logic Interface

Parallel Control

Power-Up Control

Serial Control

RF Input

RF Output

Switched Attenuator Array

6

3

2

Parameter

Test Conditions

Frequency

Minimum

Typical

Maximum

Units

Operation Frequency

DC

2000

MHz

DC

≤ 1.2 GHz

-

1.4

1.8

dB

Attenuation Accuracy

Any Bit or Bit

Combination

DC

≤ 1.2 GHz

-

-

±(0.15 + 4% of attenuation

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

DC

≤ 1.2 GHz

10

13

-

dB

Switching Speed

50% control to 0.5 dB

of final value

-

-

1

µs

Figure 2. Package Type

4x4 mm 20-Lead QFN

Tel: +86-23-62808818

Fax: +86-23-62805284

www.sipatsaw.com / sawmkt@sipat.com