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This product is a high linearity, 6-bit RF Digital Step Attenuator

(DSA) covering a 31.5 dB attenuation range in 0.5 dB steps.

The Peregrine 50

Ω RF DSA provides a parallel CMOS control

interface and it operates on 3-volt to 5-volt supply. It maintains

high attenuation accuracy over frequency and temperature and

exhibits very low insertion loss and low power consumption.

This Peregrine DSA is available in a 4x4 mm 24 lead QFN

footprint with an exposed ground paddle.

The SP4309 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

50

Ω RF Digital Attenuator

6-bit, 31.5 dB, DC-4.0 GHz

Product Description

Figure 1. Functional Schematic Diagram

SP4309

Features

independent of supply voltage

Control Logic Interface

Parallel Control

RF Input

RF Output

Switched Attenuator Array

6

Notes: 1. Device Linearity will begin to degrade below 5 MHz.

2. Note Absolute Maximum in Table 4.

3. See Figures 12 and 13 for typical attenuation error.

4. Measurements made in a 50 ohm system (see Figure 4, Test Circuit Block Diagram). Resistors (R2, R3, R5, R6, R7) with a

value of 10K-ohm are used to decouple the RF path from the control inputs.

Figure 2. Package Type

4x4 mm 24-Lead QFN

Parameter

Frequency

Min

Typ

Maximum

Units

Operation Frequency

DC

4000

MHz

Insertion Loss

DC - 2.2 GHz

2.2 - 4.0 GHz

-

-

1.6

2.2

2

3.4

dB

dB

Attenuation Accuracy

Any Bit or Bit Combination

Any Bit or Bit Combination

DC

≤ 1.0 GHz

1.0 < 2.2 GHz

2.2 < 3.8 GHz

2.2 < 3.8 GHz

2.2 < 3.8 GHz

-

-

-

-

-

-

-

0.15

0.7

1.2

±(0.10 + 3% of atten setting), not to exceed +0.20 dB

±(0.15 + 3% of atten setting)

-

-

-

dB

dB

dB

dB

dB

1 MHz - 2.2 GHz

2.2 - 4.0 GHz

30

-

32

32

-

-

dBm

dBm

Two-tone inputs +18 dBm

1 MHz - 2.2 GHz

2.2 - 4.0 GHz

-

-

52

45

-

-

dBm

dBm

Return Loss

DC - 2.2 GHz

2.2 - 4.0 GHz

15

10

20

20

-

-

dB

dB

Switching Speed

50% of control voltage to

90% of final attenuation level

-

-

1

µs

Tel: +86-23-62808818

Fax: +86-23-62805284

www.sipatsaw.com / sawmkt@sipat.com