Datasheet PE43614 (pSemi) - 8

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PE43614 UltraCMOS® RF Digital Step Attenuator Serial Addressable Register Map Figure 2
provides the serial addressable register map for the PE43614.
Figure 2 • Serial Addressable Register Map
Must be set to logic low MSB (last in) LSB (first in) Q15 Q14 Q13 Q12 Q11 Q10 Q9 Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0
A[6] A[7] A[5] A[4] A[3]
A[2] A[1] A[0]
D[7]
D[6] D[5] D[4] D[3] D[2] D[1]
D[0]
Address Word Attenuation Word The attenuation word is derived directly from the value of the attenuation state. To find the attenuation word, multiply the value of the state by four, then convert to binary. For example, to program the 18.5 dB state at address 3: 4 × 18.5 = 74 74 → 01001010 Address Word: 00000011 Attenuation Word: 01001010 Serial Input: 0000001101001010 Page 8 of 23 DOC-93670-2 – (06/2020) www.psemi.com Document Outline Features Applications Product Description Optional External VSS Control Absolute Maximum Ratings ESD Precautions Latch-up Immunity Recommended Operating Conditions Electrical Specifications Switching Frequency Spur-free Performance Glitch-safe Attenuation State The PE43614 features a novel architecture to provide safe transition behavior when changing attenuation states. When RF input power is applied, positive output power spikes are prevented during attenuation state changes by optimized internal timing c... Truth Tables Serial Addressable Register Map Programming Options Parallel/Serial Selection Parallel Mode Interface For direct parallel programming, the LE line should be pulled HIGH. Changing attenuation state control values changes the device state to new attenuation. Direct mode is ideal for manual control of the device (using hardwire, switches, or jumpers). Serial-Addressable Interface Power-up Control Settings Typical Performance Data Pin Configuration Packaging Information Moisture Sensitivity Level Package Drawing Top-Marking Specification Tape and Reel Specification Ordering Information