SP4307 Datasheet, PDF (1/10 Pages) SIPAT Co,Ltd – 75 Ω RF Digital Attenuator

Product Description
The SP4307 is a high linearity, 5-bit RF Digital Step Attenuator
(DSA) covering a 15.5 dB attenuation range in 0.5 dB steps.
The device is pin compatible with the SP430x 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 SP4307 exhibits very low insertion loss and low power
consumption. This functionality is delivered in a 4x4 mm QFN
footprint.
The SP4307 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
SP4307
75 Ω RF Digital Attenuator
5-bit, 15.5 dB, DC – 2.0 GHz
Features
• Attenuation: 0.5 dB steps to 15.5 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 Ω impedance
• Pin compatible with SP430x series
• 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
DC
Insertion Loss¹
DC ≤ 1.2 GHz
-
Attenuation Accuracy
Any Bit or Bit
Combination
DC ≤ 1.2 GHz
-
1 dB Compression^3,4
1 MHz ≤ 1.2 GHz
30
Input IP3^1,2,4
Two-tone inputs up to
+18 dBm
1 MHz ≤ 1.2 GHz
-
Return Loss
Zo = 75 ohms
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
1.95
±(0.15 + 4% of atten setting)
Not to exceed +0.25dB
-
-
-
1
Units
MHz
dB
dB
dB
dBm
dBm
dB
µs
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