SP43404 Datasheet, PDF (1/10 Pages) SIPAT Co,Ltd – 75 Ω RF Digital Attenuator

Product Description
The PSEP43404 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.
Figure 1. Functional Schematic Diagram
RF Input
Switched Attenuator Array
RF Output
Product Specification
SP43404
75 Ω RF Digital Attenuator
4-bit, 15 dB, DC – 2.0 GHz
Features
• Attenuation: 1.0 dB steps to 15 dB
• Flexible parallel and serial programming
interfaces
• Parallel latched or direct mode
• High attenuation accuracy and linearity
over temperature and frequency
• Unique power-up state selection
• Very low power consumption
• Single-supply operation
• Positive CMOS control logic
• 75 Ω impedance
• Packaged in a 20 Lead 4x4 mm QFN
Figure 2. Package Type
20 Lead 4x4 mm QFN
Parallel Control 5
Serial Control ³
Power-Up Control ¹
Control Logic Interface
Table 1. Electrical Specifications @ +25°C, V_DD = 3.0 V
Parameter
Test Conditions
Frequency
Minimum
Operation Frequency
Insertion Loss¹
Attenuation Accuracy
1 dB Compression^3,4
Input IP3^1,2,4
Return Loss
DC
DC ≤ 1.2 GHz
-
Any Bit or Bit
Combination
DC ≤ 1.2 GHz
-
1 MHz ≤ 1.2 GHz
30
Two-tone inputs up to
+18 dBm
1 MHz ≤ 1.2 GHz
-
Zo = 75 ohms
DC ≤ 1.2 GHz
10
Switching Speed
50% control
-
Typical
1.4
-
34
52
13
-
Maximum
2000
1.95
±(0.25+ 7% of atten setting)
-
-
-
1
Units
MHz
dB
dB
dBm
dBm
dB
µs
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.
Tel: [phone] Fax: [phone] www.sipatsaw.com / [e-mail]
Page 1 of 10