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Product Specification
PE4308
75 ? RF Digital Attenuator
Product Description
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.
Figure 1. Functional Schematic Diagram
5-bit, 31 dB, DC – 4.0 GHz
Features
? Attenuation: 1 dB steps to 31 dB
? Flexible parallel and serial programming
interfaces
? Latched or direct mode
? Unique power-up state selection
? Positive CMOS control logic
? High attenuation accuracy and linearity
over temperature and frequency
? Very low power consumption
? Single-supply operation
? 75 ? impedance
? Pin compatible with PE430x series
? Packaged in a 20 Lead 4x4 mm QFN
Figure 2. Package Type
20 Lead 4x4 mm QFN
Switched Attenuator Array
RF Input
Parallel Control
5
RF Output
Serial Control
Power-Up Control
3
2
Control Logic Interface
Table 1. Electrical Specifications @ +25°C, V DD = 3.0 V
Parameter
Test Conditions
Frequency
Minimum
Typical
Maximum
Units
Operation Frequency
DC
2000
MHz
Insertion Loss
2
DC ≤ 1.2 GHz
-
1.4
1.95
dB
Attenuation Accuracy
1 dB Compression3,4
Input IP3 1,2,4
Any Bit or Bit
Combination
Two-tone inputs up to
+18 dBm
DC ≤ 1.2 GHz
1 MHz ≤ 1.2 GHz
1 MHz ≤ 1.2 GHz
-
30
-
-
34
52
±(0.2 + 4% of atten setting)
Not to Exceed +0.4 dB
-
-
dB
dB
dBm
dBm
Return Loss
Switching Speed
50% control to 0.5 dB
of final value
DC ≤ 1.2 GHz
10
-
13
-
-
1
dB
μ s
Notes: 1.
2.
3.
4.
Device Linearity will begin to degrade below 1 MHz
See figures on Pages 4 to 6 for data across frequency.
Note Absolute Maximum in Table 3.
Measured in a 50 ? system.
Document No. 70-0162-04 │ www.psemi.com
?2003-2006 Peregrine Semiconductor Corp. All rights reserved.
Page 1 of 11
Logo updated under non-rev change. Peregrine products are protected under one or more of the following U.S. Patents: http://patents.psemi.com
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