ADGM1304JCPZ-R2 datasheet(21/34 Pages) AD

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Data Sheet

ADGM1304

Rev. G | Page 21 of 34

TERMINOLOGY

Insertion Loss (IL)

IL is the amount of signal attenuation between the input and

output ports of the switch when the switch is in the on state.

IL is expressed in decibels. Ensure that insertion loss is as small

as possible for maximum power transfer.

An example calculation of insertion loss based on the setup in

Figure 36 is as follows:

IL = −20log10|SRF2RFC|

where SRF2RFC is the transmission coefficient measured from RF2

to RFC with RF2 in the on position.

All unused switches are in the off position and terminated in a

purely resistive load of 50 Ω.

Isolation (ISO)

ISO is the amount of signal attenuation between the input and

output ports of the switch when the switch is in the off state. ISO

is expressed in decibels. Ensure that isolation is as large as

possible.

An example calculation of isolation based on the setup in Figure 37

is as follows:

ISO = −20log10|SRFCRF1|

where SRFCRF1 is the transmission coefficient measured from

RFC to RF1 with RF1 in the off position.

All unused switches are in the off position and terminated in a

purely resistive load of 50 Ω.

Crosstalk (CTK)

CTK is a measure of unwanted signals coupled through from

one channel to another because of parasitic capacitance. CTK is

expressed in decibels.

An example calculation of crosstalk based on the setup in

Figure 38 is as follows:

CTK = −20log10|SRF1RF2|

where SRF1RF2 is the transmission coefficient measured from RF1

to RF2 with RF1 in the off position and RF2 in the on position.

All unused switches are in the off position and terminated in a

purely resistive load of 50 Ω.

Return Loss (RL)

RL is the magnitude of the reflection coefficient (expressed in

decibels), and the amount of reflected signal relative to the

incident signal.

An example calculation of return loss based on the setup in

Figure 36 is as follows:

RL = −20log10|S11|

where S11 is the reflection coefficient of the port under test.

Third-Order Intermodulation Intercept (IIP3)

IP3 is the intersection point of the fundamental output power

(POUT) vs. input power (PIN) extrapolated line and the third-

order intermodulation products extrapolated line of a two-tone

test. IIP3 is a figure of merit that characterizes the switch

linearity.

Second-Order Intermodulation Intercept (IIP2)

IIP2 is the intersection point of the fundamental POUT vs. PIN

extrapolated line and the second-order intermodulation

products extrapolated line of a two-tone test. IIP2 is a figure of

merit that characterizes the switch linearity.

Second Harmonic (HD2)

HD2 is the amplitude of the second harmonic, where, for a

signal whose fundamental frequency is f, the second harmonic

has a frequency 2f. This measurement is a single tone test,

expressed with reference to the carrier signal (dBc).

Third Harmonic (HD3)

HD3 is the amplitude of the third harmonic, where, for a signal

whose fundamental frequency is f, the third harmonic has a

frequency 3f. This measurement is a single tone test, expressed

with reference to the carrier signal (dBc).

RF Power Rating

The RF power rating is the maximum level of RF power that

passes through the switch without degradation to the switch

lifetime when it is in the on state.

On Switching Time (tON)

tON is the time it takes for the switch to turn on. It is measured

from 50% of the control signal (INx) to 90% of the on level.

No power is applied through the switch during this test (cold

switched). The switch is terminated into a 50 Ω load.

Off Switching Time (tOFF)

tOFF is the time it takes for the switch to turn off. It is measured

from 50% of the control signal (INx) to 10% of the on level.

No power is applied through the switch during this test (cold

switched). The switch is terminated into a 50 Ω load.

Actuation Frequency

The actuation frequency refers to the speed at which the

ADGM1304 can be switched on and off. It is dependent on

both settling times and on to off switching times.

Wake-Up Time

The wake-up time is a measure of the time required for the

voltage on VCP to reach the typical voltage of 80 V after the

device exits sleep mode.

Video Feedthrough

Video feedthrough is a measure of the spurious signals present

at the RF ports of the switch when the control voltage is

switched from high to low or from low to high without an RF

signal present.

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