SP4304 Datasheet, PDF (1/10 Pages) SIPAT Co,Ltd – 75 Ω RF Digital Attenuator

Product Description
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
SP4304
75 Ω RF Digital Attenuator
6-bit, 31.5 dB, DC – 2.0 GHz
Features
• 75 Ω impedance
• Attenuation: 0.5 dB steps to 31.5 dB
• Low distortion for CATV and multi-carrier
applications
• Flexible parallel and serial programming
interfaces
• 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
• Packaged in a 20 lead 4x4 mm QFN
Figure 1. Functional Schematic Diagram
RF Input
Switched Attenuator Array
Figure 2. Package Type
4x4 mm 20-Lead QFN
RF Output
Parallel Control 6
Serial Control ³
Power-Up Control ²
Control Logic Interface
Table 1. Electrical Specifications @ +25 °C, V_DD = 3.0 V, Z_o = 75 Ω
Parameter
Test Conditions
Frequency Minimum
Operation Frequency
DC
Insertion Loss²
Attenuation Accuracy
1 dB Compression^3,4
Input IP3^1,2,4
Return Loss
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
-
DC ≤ 1.2 GHz
10
Switching Speed
50% control to 0.5 dB
-
of final value
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.
Typical
1.4
-
34
52
13
-
Maximum
2000
1.8
±(0.15 + 4% of attenuation
setting)
-
-
-
1
Units
MHz
dB
dB
dBm
dBm
dB
µs
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