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PE43713 Datasheet(PDF) 6 Page - Peregrine Semiconductor |
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PE43713 Datasheet(HTML) 6 Page - Peregrine Semiconductor |
6 / 31 page PE43713 UltraCMOS® RF Digital Step Attenuator Page 6 DOC-49614-1 – (3/2015) www.psemi.com Switching Frequency The PE43713 has a maximum 25 kHz switching rate in normal mode (pin 20 tied to ground). A faster switching rate is available in bypass mode (pin 20 tied to VSS_EXT). The rate at which the PE43713 can be switched is then limited to the switching time as specified in Table 3. Switching frequency is defined to be the speed at which the DSA can be toggled across attenuation states. Switching time is the time duration between the point the control signal reaches 50% of the final value and the point the output signal reaches within 10% or 90% of its target value. Spur-free Performance The typical spurious performance of the PE43713 in normal mode is –130 dBm (pin 20 tied to ground). If spur-free performance is desired, the internal negative voltage generator can be disabled by applying a negative voltage to VSS_EXT (pin 20). Glitch-less Attenuation State Transitions The PE43713 features a novel architecture to provide the best-in-class glitch-less transition behavior when changing attenuation states. When RF input power is applied, the output power spikes are greatly reduced ( ≤0.3 dB) during attenuation state changes when comparing to previous generations of DSAs. Truth Tables Table 4–Table 6 provide the truth tables for the PE43713. Table 4 • Parallel Truth Table Parallel Control Setting Attenuation Setting RF1–RF2 D6 D5 D4 D3 D2 D1 D0 L L L L L L L Reference IL L L L L L L H 0.25 dB L L L L L H L 0.5 dB LL L L H L L 1 dB LL L H L L L 2 dB LL H L L L L 4 dB L H L LLL L 8 dB H L L L L L L 16 dB H HH HHHH 31.75 dB Table 5 • Serial Address Word Truth Table Address Word Address Setting A7 (MSB) A6 A5 A4 A3 A2 A1 A0 X X X X X L L L 000 X X X X X L L H 001 X X X X X L H L 010 XX X X X L H H 011 X X X X X H L L 100 X X X X X H L H 101 XX X X X H H L 110 X X X X X HHH 111 Table 6 • Serial Attenuation Word Truth Table Attenuation Word Attenuation Setting RF1–RF2 D7 D6 D5 D4 D3 D2 D1 D0 (LSB) LL LL LLL L Reference IL LL LL LLL H 0.25 dB LL LL LL H L 0.5 dB LL LL L H L L 1 dB LL LL H LL L 2 dB LL L H LLL L 4 dB LL H L LLL L 8 dB L H LL LLL L 16 dB L H H H H H H H 31.75 dB Table 4 • Parallel Truth Table (Cont.) Parallel Control Setting Attenuation Setting RF1–RF2 D6 D5 D4 D3 D2 D1 D0 |
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