PE4314B-Z datasheet(6/27 Pages) PSEMI

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PE4314

RF Digital Step Attenuator

Page 6

DOC-81718-1 – (02/2017)

www.psemi.com

Switching Frequency

The PE4314 has a maximum 25 kHz switching

frequency in normal mode (pin 12 tied to ground). A

faster switching frequency is available in bypass

mode (pin 12 tied to VSS_EXT). The rate at which the

PE4314 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 reached 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 PE4314 in

normal mode is –158 dBm/Hz (pin 12 tied to ground).

The spur fundamental occurs around 2.6 MHz and it

has a bandwidth of 100 kHz. This results in a CATV

band typical spurious level for frequencies above

5 MHz of –154 dBm. If spur-free performance is

desired, the internal negative voltage generator can

be disabled by applying a negative voltage to VSS_EXT

(pin 12).

Glitch-less Attenuation State Transitions

The PE4314 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

(0.5 dB) during attenuation state changes when

comparing to previous generations of DSAs.

Thermal Data

Psi-JT (



JT), junction top-of-package, is a thermal

metric to estimate junction temperature of a device on

the customer application PCB (JEDEC JESD51-2).



JT = (TJ – TT)/P

where



JT = junction-to-top of package characterization

parameter, °C/W

TJ = die junction temperature, °C

TT = package temperature (top surface, in the

center), °C

P = power dissipated by device, Watts

Truth Tables

Table 5 and Table 6 provide the truth tables for the

PE4314.

Table 4 • Thermal Data for PE4314

Parameter

Typ Unit

Maximum junction temperature, TJMAX

(RF input power, CW = 24 dBm, +105 °C ambient)

124

°C



°C/W

JA, junction-to-ambient thermal resistance

°C/W

Table 5 • Parallel Truth Table for PE4314(*)

P/S C16

C1 C0.5

Attenuation

Setting

RF1–RF2

0000

Reference IL

0000

0.5 dB

0000

1 dB

0000

2 dB

0001

4 dB

0010

8 dB

0100

16 dB

0111

31.5 dB

Note: * Not all 64 possible combinations of C0.5–C16 are shown.

Table 6 • Parallel Power-up Truth Table for PE4314(*)

P/S

PUP1 PUP2

Attenuation Setting

RF1–RF2

0000

Reference IL

0001

8 dB

0010

16 dB

0011

31.5 dB

Defined by C0.5–C16

Note: * Power up with LE = 1 provides normal parallel operation with

C0.5–C16, and PUP1 and PUP2 are not active.

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